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doc/concepts.md
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doc/concepts.md
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# Overview
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The objective of the ovni project is to provide insight into what
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happened at execution of a program.
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The key pieces of software involved are instrumented so they emit events
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during the execution which allow the reconstruction of the execution
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later on.
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During the execution phase, the information gathered in the events is
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kept very short and simple, so the overhead is kept at minimum to avoid
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disturbing the execution process. Here is an example of a single event
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emitted during the execution phase, informing the current thread to
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finish the execution:
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00 4f 48 65 52 c0 27 b4 d3 ec 01 00
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During the emulation phase, the events are read and processed in the
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emulator, reconstructing the execution. State transitions are recorded
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in a Paraver trace. Here is an example of the same thread ceasing the
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execution:
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2:0:1:1:1:50105669:1:0
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Finally, loading the trace in the Paraver program, we can generate a
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timeline visualization of the state change. Here is the example for the
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same state transition of the thread stopping the execution:
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62
doc/developer-guide/index.md
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62
doc/developer-guide/index.md
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# Developer guide
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To contribute to the ovni project, please read carefully this guide and
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follow the guidelines to have your contribution accepted in the project.
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## First principle: keep things simple
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The most important principle in the emulator is to keep things simple.
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It is extremely important to avoid any complexities, including
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sacrificing the performance if necessary to keep the design simple.
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## Use a formal model
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Design a model of the library or runtime that you want to instrument and
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all posible state transitions to be checked by the emulator. Detect
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as many error conditions as posible. Otherwise, it becomes very hard to
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analyze millions of state transitions by the naked eye to determine if
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something went wrong.
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## Emit redundant information
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At runtime, emit redundant information in the events, unless they affect
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the performance very badly. This information may include the ID of the
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current task or any other identification, which the emulator already
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knows. This redundant information is the only bit of data the emulator
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can use to perform consistency checks and ensure the emulated state
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follows the runtime state.
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The extra information also allows a human to read the binary trace and
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understand what is happening without the need to keep track of the
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emulation state all the time.
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## Document your model
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Explain your model and the concepts behind it, so a user can understand
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how to interpret the information provided by the timeline views.
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The emulator only tries to represent the execution, but is never
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perfect. Sometimes it is difficult or impossible to instrument what
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happened at runtime, so an approximation is the only posible approach.
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Explain in the documentation how the model approximates the real
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execution so the user can determine what information is only an
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approximation.
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## No dependencies
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Don't pull any extra dependencies. If you need them, you are probably
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violating the first principle (keeping things simple). Alternatively,
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place a portable implementation in ovni, so we don't need to depend on
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any other library when running the emulator.
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## Testing
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The ovni project has two types of tests: manual tests, which
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artificially create the events in the trace, and only test the emulation
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part. And runtime tests, which run the complete program with the
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instrumentation enabled, generate a trace and then run the emulator.
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When adding support for a new library or model, ensure you add enough
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tests to cover the most important problems. Specially those hard to
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detect without the current runtime state. See the `test/` directory for
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examples of other models.
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@ -161,8 +161,9 @@ KCI Is back in the CPU due to a context switch
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6Ha Attaches to Nanos6 as external thread
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6HA Detaches from Nanos6 as external thread
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6Hs Begins the spawn of a function
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6HS Ends the spawn of a function
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6s[ Begins to spawn a function via spawnFunction()
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6s] Ends spawning a function
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6Dr Begins the registration of a task's accesses
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6DR Ends the registration of a task's accesses
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66
doc/emulation/fig/model.dot
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66
doc/emulation/fig/model.dot
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digraph {
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#rankdir=LR;
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graph [ranksep="1"];
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newrank=true;
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subgraph cluster_resource {
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color="#ffeeee";
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style=filled;
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label="Resouce model";
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cluster -> {"node 0", "node 1"}
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"node 0" -> {"cpu 0.0", "cpu 0.1"}
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"node 1" -> {"cpu 1.0", "cpu 1.1"}
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}
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subgraph cluster_process {
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label="Process model"
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genesis -> {"loom 0", "loom 1"}
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"loom 0" -> {"pid 0.0", "pid 0.1"}
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"loom 1" -> {"pid 1.0", "pid 1.1"}
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"pid 0.0" -> {"th 0.0.0", "th 0.0.1"}
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"pid 0.1" -> {"th 0.1.0", "th 0.1.1"}
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}
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subgraph cluster_task {
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color="#eeeeff";
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style=filled;
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label="Task model";
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workload -> { "app 0", "app 1"};
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"app 0" -> {"rank 0.0", "rank 0.1"};
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"app 1" -> {"rank 1.0", "rank 1.1"};
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"rank 0.0" -> {"task 0.0.0","task 0.0.1"};
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"rank 0.1" -> {"task 0.1.0", "task 0.1.1"};
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}
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{rank = same; workload; cluster; genesis;}
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{
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rank = same;
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"node 0"; "node 1"; "loom 0"; "loom 1";
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}
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{ rank=same; "app 0"; "app 1"; }
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{
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rank = same; "rank 0.0"; "pid 0.0";
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}
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{
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rank = same; "th 0.0.0"; "task 0.0.0";
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"cpu 0.0"; "cpu 0.1"; "cpu 1.0"; "cpu 1.1";
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}
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edge [style=dashed, constraint=false];
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"loom 0" -> "node 0" [color=blue, label="mapped to"];
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"rank 0.0" -> "pid 0.0" [color=blue, label="mapped to"];
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"task 0.0.0" -> "th 0.0.0" [color=red, label="runs at"];
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"th 0.0.0" -> "cpu 0.0" [color=red, label="runs at"];
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}
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|
Before Width: | Height: | Size: 158 KiB After Width: | Height: | Size: 158 KiB |
385
doc/emulation/fig/model.svg
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385
doc/emulation/fig/model.svg
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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graph [nodesep=1, ranksep=1];
|
||||
{rank = same; unknown; "running"; "dead";}
|
||||
//{rank = same; cooling; paused; warming;}
|
||||
|
||||
unknown -> "running" [label="eXecute *"];
|
||||
"running" -> "cooling" [label="Cool"];
|
||||
"cooling" -> "paused" [label="* Pause"];
|
||||
"running" -> "paused" [label="* Pause"];
|
||||
"paused" -> "running" [label="Resume *"];
|
||||
|
||||
"paused" -> "warming" [label="Warm *"];
|
||||
"warming" -> "running" [label="Resume"];
|
||||
"running" -> "dead" [label="* End"];
|
||||
}
|
||||
|
Before Width: | Height: | Size: 58 KiB After Width: | Height: | Size: 58 KiB |
104
doc/emulation/fig/thread-model.svg
Normal file
104
doc/emulation/fig/thread-model.svg
Normal file
@ -0,0 +1,104 @@
|
||||
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
|
||||
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
|
||||
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
|
||||
<!-- Generated by graphviz version 5.0.0 (0)
|
||||
-->
|
||||
<!-- Pages: 1 -->
|
||||
<svg width="596pt" height="413pt"
|
||||
viewBox="0.00 0.00 596.34 413.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
|
||||
<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 409)">
|
||||
<polygon fill="white" stroke="transparent" points="-4,4 -4,-409 592.34,-409 592.34,4 -4,4"/>
|
||||
<!-- unknown -->
|
||||
<g id="node1" class="node">
|
||||
<title>unknown</title>
|
||||
<ellipse fill="none" stroke="black" cx="87.2" cy="-387" rx="52.79" ry="18"/>
|
||||
<text text-anchor="middle" x="87.2" y="-383.3" font-family="Times,serif" font-size="14.00">unknown</text>
|
||||
</g>
|
||||
<!-- running -->
|
||||
<g id="node2" class="node">
|
||||
<title>running</title>
|
||||
<ellipse fill="none" stroke="black" cx="331.2" cy="-387" rx="47.39" ry="18"/>
|
||||
<text text-anchor="middle" x="331.2" y="-383.3" font-family="Times,serif" font-size="14.00">running</text>
|
||||
</g>
|
||||
<!-- unknown->running -->
|
||||
<g id="edge1" class="edge">
|
||||
<title>unknown->running</title>
|
||||
<path fill="none" stroke="black" d="M140.14,-387C179.47,-387 233.07,-387 273.49,-387"/>
|
||||
<polygon fill="black" stroke="black" points="273.72,-390.5 283.72,-387 273.72,-383.5 273.72,-390.5"/>
|
||||
<text text-anchor="middle" x="211.8" y="-393.8" font-family="Times,serif" font-size="14.00">eXecute *</text>
|
||||
</g>
|
||||
<!-- dead -->
|
||||
<g id="node3" class="node">
|
||||
<title>dead</title>
|
||||
<ellipse fill="none" stroke="black" cx="555.2" cy="-387" rx="33.29" ry="18"/>
|
||||
<text text-anchor="middle" x="555.2" y="-383.3" font-family="Times,serif" font-size="14.00">dead</text>
|
||||
</g>
|
||||
<!-- running->dead -->
|
||||
<g id="edge8" class="edge">
|
||||
<title>running->dead</title>
|
||||
<path fill="none" stroke="black" d="M378.7,-387C418.03,-387 473.44,-387 511.64,-387"/>
|
||||
<polygon fill="black" stroke="black" points="511.93,-390.5 521.93,-387 511.93,-383.5 511.93,-390.5"/>
|
||||
<text text-anchor="middle" x="450.35" y="-393.8" font-family="Times,serif" font-size="14.00">* End</text>
|
||||
</g>
|
||||
<!-- cooling -->
|
||||
<g id="node4" class="node">
|
||||
<title>cooling</title>
|
||||
<ellipse fill="none" stroke="black" cx="44.2" cy="-264" rx="44.39" ry="18"/>
|
||||
<text text-anchor="middle" x="44.2" y="-260.3" font-family="Times,serif" font-size="14.00">cooling</text>
|
||||
</g>
|
||||
<!-- running->cooling -->
|
||||
<g id="edge2" class="edge">
|
||||
<title>running->cooling</title>
|
||||
<path fill="none" stroke="black" d="M289.6,-378.08C251,-369.83 192.54,-355.01 145.2,-333 118.48,-320.58 90.92,-301.53 71.35,-286.75"/>
|
||||
<polygon fill="black" stroke="black" points="73.28,-283.82 63.21,-280.5 69.01,-289.37 73.28,-283.82"/>
|
||||
<text text-anchor="middle" x="161.2" y="-321.8" font-family="Times,serif" font-size="14.00">Cool</text>
|
||||
</g>
|
||||
<!-- paused -->
|
||||
<g id="node5" class="node">
|
||||
<title>paused</title>
|
||||
<ellipse fill="none" stroke="black" cx="331.2" cy="-141" rx="44.39" ry="18"/>
|
||||
<text text-anchor="middle" x="331.2" y="-137.3" font-family="Times,serif" font-size="14.00">paused</text>
|
||||
</g>
|
||||
<!-- running->paused -->
|
||||
<g id="edge4" class="edge">
|
||||
<title>running->paused</title>
|
||||
<path fill="none" stroke="black" d="M321.28,-369.05C310.18,-349.04 292.9,-314.36 286.2,-282 277.68,-240.9 298.67,-194.84 314.77,-167.15"/>
|
||||
<polygon fill="black" stroke="black" points="317.82,-168.87 319.99,-158.5 311.83,-165.25 317.82,-168.87"/>
|
||||
<text text-anchor="middle" x="313.2" y="-260.3" font-family="Times,serif" font-size="14.00">* Pause</text>
|
||||
</g>
|
||||
<!-- cooling->paused -->
|
||||
<g id="edge3" class="edge">
|
||||
<title>cooling->paused</title>
|
||||
<path fill="none" stroke="black" d="M58.64,-246.83C73.38,-231.3 97.68,-208.29 123.2,-195 172.77,-169.19 235.64,-155.43 279.22,-148.46"/>
|
||||
<polygon fill="black" stroke="black" points="279.96,-151.89 289.32,-146.91 278.9,-144.97 279.96,-151.89"/>
|
||||
<text text-anchor="middle" x="150.2" y="-198.8" font-family="Times,serif" font-size="14.00">* Pause</text>
|
||||
</g>
|
||||
<!-- paused->running -->
|
||||
<g id="edge5" class="edge">
|
||||
<title>paused->running</title>
|
||||
<path fill="none" stroke="black" d="M340.01,-158.67C344.91,-168.85 350.54,-182.32 353.2,-195 365.77,-255.04 368.14,-273.04 355.2,-333 353.24,-342.08 349.58,-351.48 345.71,-359.8"/>
|
||||
<polygon fill="black" stroke="black" points="342.47,-358.47 341.15,-368.98 348.73,-361.58 342.47,-358.47"/>
|
||||
<text text-anchor="middle" x="398.7" y="-260.3" font-family="Times,serif" font-size="14.00">Resume *</text>
|
||||
</g>
|
||||
<!-- warming -->
|
||||
<g id="node6" class="node">
|
||||
<title>warming</title>
|
||||
<ellipse fill="none" stroke="black" cx="470.2" cy="-18" rx="51.99" ry="18"/>
|
||||
<text text-anchor="middle" x="470.2" y="-14.3" font-family="Times,serif" font-size="14.00">warming</text>
|
||||
</g>
|
||||
<!-- paused->warming -->
|
||||
<g id="edge6" class="edge">
|
||||
<title>paused->warming</title>
|
||||
<path fill="none" stroke="black" d="M349.08,-124.43C373.24,-103.4 416.46,-65.78 444.21,-41.62"/>
|
||||
<polygon fill="black" stroke="black" points="446.69,-44.1 451.94,-34.9 442.1,-38.82 446.69,-44.1"/>
|
||||
<text text-anchor="middle" x="436.2" y="-75.8" font-family="Times,serif" font-size="14.00">Warm *</text>
|
||||
</g>
|
||||
<!-- warming->running -->
|
||||
<g id="edge7" class="edge">
|
||||
<title>warming->running</title>
|
||||
<path fill="none" stroke="black" d="M475.21,-35.95C478.71,-49.65 482.54,-69.47 481.2,-87 474.51,-174.43 485.56,-201.33 451.2,-282 434.89,-320.27 396.12,-349.56 367.03,-367.15"/>
|
||||
<polygon fill="black" stroke="black" points="365.21,-364.16 358.35,-372.24 368.74,-370.21 365.21,-364.16"/>
|
||||
<text text-anchor="middle" x="504.2" y="-198.8" font-family="Times,serif" font-size="14.00">Resume</text>
|
||||
</g>
|
||||
</g>
|
||||
</svg>
|
||||
|
After Width: | Height: | Size: 5.5 KiB |
@ -13,10 +13,10 @@ The emulator uses several models to identify how the resources are being
|
||||
used. The following diagram despicts the resource, process and task
|
||||
model.
|
||||
|
||||
|
||||
[](fig/model.svg)
|
||||
|
||||
The resource model directly maps to the available hardware on the
|
||||
machine. It consists of clusters which contains nodes, where each node
|
||||
machine. It consists of a cluster which contains nodes, where each node
|
||||
contains a set of CPUs that can execute instructions.
|
||||
|
||||
The process model tracks the state of processes and threads. Processes
|
||||
@ -39,3 +39,19 @@ processing of events can keep the disk writting as the bottleneck.
|
||||
The linter mode enables more tests which are disabled from the default
|
||||
mode to prevent costly operations running in the emulator by default.
|
||||
The linter tests are enabled when running the ovni testsuite.
|
||||
|
||||
## Emulation models
|
||||
|
||||
Each component is implemented in an emulation model, which consists of
|
||||
the following elements:
|
||||
|
||||
- A single byte model identification (for example `O`).
|
||||
- A set of runtime events with that model identification (see the [list
|
||||
of events](events)).
|
||||
- Rules that determine which sequences of events are valid.
|
||||
- The emulation hooks that process each event and modify the state of
|
||||
the emulator.
|
||||
- A set of channels that output the states from the emulator.
|
||||
- A set of Paraver views that present the information in a timeline.
|
||||
|
||||
All the models are independent and can be instrumented at the same time.
|
||||
|
||||
@ -1,54 +1,74 @@
|
||||
# Nanos6 model
|
||||
|
||||
The Nanos6 emulator generates four different Paraver views, which are
|
||||
explained in this document.
|
||||
The Nanos6 runtime library implements the OmpSs-2 tasking model, which
|
||||
schedules the execution of tasks with dependencies. For more information
|
||||
see the [OmpSs-2 website][oss] and the [Nanos6 repository][nanos6].
|
||||
|
||||
## Task id
|
||||
[oss]: https://pm.bsc.es/ompss-2
|
||||
[nanos6]: https://github.com/bsc-pm/nanos6
|
||||
|
||||
The task id view represents the id of the Nanos6 task instance that is
|
||||
currently executing on each thread/cpu. This id is a monotonically
|
||||
increasing identifier assigned on task creation. Lower ids correspond to
|
||||
tasks created at an earlier point than higher ids.
|
||||
The library is instrumented to track the execution of tasks and also the
|
||||
execution path inside the runtime library to identify what is happening.
|
||||
This information is typically used by both the users and the developers
|
||||
of the Nanos6 library to analyze problems and unwanted behaviors.
|
||||
Towards this goal, four different Paraver views are generated, which are
|
||||
explained below.
|
||||
|
||||
## Task type
|
||||
The state of each task is modelled in a simple finite state machine,
|
||||
which identifies the main state changes of the task. The task is set to
|
||||
the *Running* state only when is executing the body of the task,
|
||||
consisting of user defined code. The states can be observed in the
|
||||
following diagram:
|
||||
|
||||
|
||||
|
||||
## Task ID view
|
||||
|
||||
The task ID view represents the ID of the Nanos6 task instance that is
|
||||
currently executing on each thread. This ID is a monotonically
|
||||
increasing identifier assigned on task creation. Lower IDs correspond to
|
||||
tasks created at an earlier point than higher IDs.
|
||||
|
||||
## Task type view
|
||||
|
||||
Every task in Nanos6 contains a task type, which roughly corresponds to
|
||||
the actual location in the code a task was declared. For example if a
|
||||
function fn() is declared as a Nanos6 task, and it is called multiple
|
||||
times in a program, every created task will have a different id, but the
|
||||
same type.
|
||||
function is declared as a Nanos6 task, and it is called multiple times
|
||||
in a program, every created task will have a different ID, but the same
|
||||
type.
|
||||
|
||||
In the view, each type is shown with a label declared in the source with
|
||||
the label() attribute of the task. If no label was specified, one is
|
||||
the label attribute of the task. If no label was specified, one is
|
||||
automatically generated for each type.
|
||||
|
||||
Note that in this view, event value is a hash function of the type
|
||||
label, so two distinct types (tasks declared in different parts of the
|
||||
code) with the same label will share event value and will hence be
|
||||
indistinguishable.
|
||||
Note that in this view, the numeric event value is a hash function of
|
||||
the type label, so two distinct types (tasks declared in different parts
|
||||
of the code) with the same label will share the event value and have the
|
||||
same color.
|
||||
|
||||
## MPI Rank
|
||||
## MPI rank view
|
||||
|
||||
Represents the current MPI rank for the currently running task in a
|
||||
thread or cpu.
|
||||
This view shows the numeric MPI rank of the process running the current
|
||||
task. It is only shown when the task is in the running state. This view
|
||||
is specially useful to identify task in a distributed workload, which
|
||||
spans several nodes.
|
||||
|
||||
## Subsystem view
|
||||
|
||||
The subsystem view attempts to provide a general overview of what the
|
||||
runtime is doing at any point in time. This view is more complex to
|
||||
understand than the others but is generally the most useful to
|
||||
understand what is happening and debug problems related with the
|
||||
runtime.
|
||||
The subsystem view attempts to provide a general overview of what Nanos6
|
||||
is doing at any point in time. This view is more complex to understand
|
||||
than the others but is generally the most useful to understand what is
|
||||
happening and debug problems related with Nanos6 itself.
|
||||
|
||||
The view shows the state of the runtime for each thread (and for each
|
||||
CPU, the state of the running thread in that CPU).
|
||||
|
||||
The state is computed by the following method: the runtime code is
|
||||
completely divided into sections of code (machine instructions) S1, S2,
|
||||
..., SN, which are instrumented (an event is emitted when entering and
|
||||
exiting each section), and one common section of code which is shared
|
||||
across the subsystems, U, of no interest. We also assume any other code
|
||||
not belonging to the runtime to be in the U section.
|
||||
completely divided into sections of code (machine instructions) $`S_1,
|
||||
S_2, \ldots, S_N`$, which are instrumented (an event is emitted when entering
|
||||
and exiting each section), and one common section of code which is
|
||||
shared across the subsystems, $`U`$, of no interest. We also assume any
|
||||
other code not belonging to the runtime belongs to the $`U`$ section.
|
||||
|
||||
!!! remark
|
||||
|
||||
@ -58,36 +78,35 @@ To determine the state of a thread, we look into the stack to see what
|
||||
is the top-most instrumented section.
|
||||
|
||||
At any given point in time, a thread may be executing code with a stack
|
||||
that spawns multiple sections, for example *S1, U, S2, S3* and *U* (the
|
||||
last is on top). The subsystem view selects the last subsystem section
|
||||
from the stack ignoring the common section *U*, and presents that section
|
||||
as the current state of the execution, in this case the *S3*.
|
||||
that spawns multiple sections, for example $`[ S_1, U, S_2, S_3, U ]`$
|
||||
(the last is current stack frame). The subsystem view selects the last
|
||||
subsystem section from the stack ignoring the common section $`U`$, and
|
||||
presents that section as the current state of the execution, in this
|
||||
case the section $`S_3`$.
|
||||
|
||||
Additionally, the runtime sections are grouped together in subsystems,
|
||||
which form a group of closely related functions. A complete set of
|
||||
states for each subsystem is listed below.
|
||||
Additionally, the runtime sections $`S_i`$ are grouped together in
|
||||
subsystems, which form a closely related group of functions. The
|
||||
complete list of subsystems and sections is shown below.
|
||||
|
||||
When there is no instrumented section in the thread stack, the state is
|
||||
set to **No subsystem**.
|
||||
|
||||
### Task subsystem
|
||||
|
||||
The **Task** subsystem contains the code that controls the lifecycle of
|
||||
tasks. It contains the following sections:
|
||||
Task subsystem
|
||||
: The **Task** subsystem contains the code that controls the life cycle
|
||||
of tasks. It contains the following sections:
|
||||
|
||||
- **Running**: Executing the body of the task (user defined code).
|
||||
|
||||
- **Spawning function**: Registering a new spawn function
|
||||
(programmatically created task)
|
||||
- **Spawning function**: Spawning a function as task (it will be
|
||||
submitted to the scheduler for later execution).
|
||||
|
||||
- **Creating**: Creating a new task, through `nanos6_create_task`
|
||||
|
||||
- **Submitting**: Submitting a recently created task, through
|
||||
`nanos6_submit_task`
|
||||
|
||||
### Scheduler subsystem
|
||||
|
||||
The **Scheduler** system groups the actions that relate to the queueing
|
||||
Scheduler subsystem
|
||||
: The **Scheduler** system groups the actions that relate to the queueing
|
||||
and dequeueing of ready tasks. It contains the following sections:
|
||||
|
||||
- **Waiting for tasks**: Actively waiting for tasks inside the
|
||||
@ -99,9 +118,8 @@ to other threads
|
||||
- **Adding ready tasks**: Adding tasks to the scheduler queues,
|
||||
but outside of the scheduler lock.
|
||||
|
||||
### Dependency subsystem
|
||||
|
||||
The **Dependency** system only contains the code that manages the
|
||||
Dependency subsystem
|
||||
: The **Dependency** system only contains the code that manages the
|
||||
registration of task dependencies. It contains the following sections:
|
||||
|
||||
- **Registering**: Registering a task's dependencies
|
||||
@ -109,9 +127,8 @@ registration of task dependencies. It contains the following sections:
|
||||
- **Unregistering**: Releasing a task's dependencies because
|
||||
it has ended
|
||||
|
||||
### Blocking subsystem
|
||||
|
||||
The **Blocking** subsystem deals with the code stops the thread
|
||||
Blocking subsystem
|
||||
: The **Blocking** subsystem deals with the code stops the thread
|
||||
execution. It contains the following sections:
|
||||
|
||||
- **Taskwait**: Task is blocked while inside a taskwait
|
||||
|
||||
@ -1,11 +1,16 @@
|
||||
# nOS-V model
|
||||
|
||||
## nOS-V task type colors
|
||||
The nOS-V runtime is composed of tasks that can be scheduled to run in
|
||||
threads. Tasks can be paused and resumed, leaving the CPUs free to
|
||||
execute other tasks. The nOS-V model tracks the state of each task as
|
||||
well as the state of the runtime internal state.
|
||||
|
||||
The color assigned to each nOS-V task type is computed from the task
|
||||
type label using a hash function; the task type id doesn't affect in any
|
||||
way how the color gets assigned. This method provides two desirable
|
||||
properties:
|
||||
## Task type colors
|
||||
|
||||
In the Paraver timeline, the color assigned to each nOS-V task type is
|
||||
computed from the task type label using a hash function; the task type
|
||||
id doesn't affect in any way how the color gets assigned. This method
|
||||
provides two desirable properties:
|
||||
|
||||
- Invariant type colors over time: the order in which task types are
|
||||
created doesn't affect their color.
|
||||
|
||||
@ -1,5 +1,63 @@
|
||||
# Ovni model
|
||||
|
||||
The ovni model tracks the state of threads and cpus.
|
||||
The ovni model tracks the state of threads and CPUs and provides the
|
||||
basis for other models.
|
||||
|
||||
|
||||
## Thread model
|
||||
|
||||
The thread state is modelled as a finite state machine, depicted below:
|
||||
|
||||
{: style="width:80%"}
|
||||
|
||||
All threads begin in the `unknown` state and perform a transition to
|
||||
running then the `execute` event (with MCV `OHx`) is received.
|
||||
Notice that the runtime thread started the execution **before** emitting
|
||||
the execute event, as it is not posible to emit the event at the exact
|
||||
moment the thread begins the execution.
|
||||
|
||||
The asterisk `*` in the transitions states when the event is emitted. If
|
||||
appears *before* the transition name, it happens *before* the real
|
||||
event. If appears *after* then it is emitted *after* the real event.
|
||||
|
||||
In the case of the thread beginning the execution, the event is emitted
|
||||
*after* the thread begins the execution, so the asterisk appears after.
|
||||
|
||||
### Cooling and warming states
|
||||
|
||||
In the Linux kernel, it is generally not possible to switch from a
|
||||
thread A to another thread B in a single atomic operation, from
|
||||
user-space. The thread A must first wake B and then put itself to sleep.
|
||||
But the kernel is free to continue the execution of B instead of just
|
||||
executing the last instructions of A so it can stop.
|
||||
|
||||
This limitation causes a time region at which more than one thread is
|
||||
scheduled to the same CPU, which is a property that is generally
|
||||
considered an error in parallel runtimes. To avoid this situation, the
|
||||
additional states *cooling* and *warming* are introduced.
|
||||
|
||||
The cooling state indicates that the thread will be put to sleep and may
|
||||
temporarily wake another thread in the same CPU. Similarly, the warming
|
||||
state indicates that a thread is waking up, but it may be another thread
|
||||
in its own CPU for a while.
|
||||
|
||||
These states allow the emulator to ignore the threads in the cooling and
|
||||
warming states when only interested in those in the running state, but
|
||||
at the same time allow the developers to identify the real transition
|
||||
sequence to explain potential delays.
|
||||
|
||||
## CPU model
|
||||
|
||||
The CPU can only execute one thread at a time, and it may have multiple
|
||||
threads assigned. When two or more threads are in the execution state,
|
||||
the emulator cannot determine which one is really being executed, so it
|
||||
will set all the channels to an error state.
|
||||
|
||||
!!! Caution
|
||||
|
||||
Multiple threads running in the same CPU typically indicates an
|
||||
error of instrumentation or a problem in the runtime.
|
||||
|
||||
The emulator automatically switches the channels from one thread to
|
||||
another when a thread is switched from the CPU. So the different models
|
||||
don't need to worry about thread transitions. See the
|
||||
[channels](../channels) section for more information.
|
||||
|
||||
@ -3,13 +3,14 @@
|
||||
font-size: 85%;
|
||||
border: none;
|
||||
padding: 0px;
|
||||
background: #f8f8f8;
|
||||
background: #eee;
|
||||
}
|
||||
|
||||
.rst-content pre code {
|
||||
color: inherit;
|
||||
font-size: 80%;
|
||||
line-height: 1.5em;
|
||||
background: #eee;
|
||||
}
|
||||
|
||||
p {
|
||||
|
||||
8
doc/fig/instrumentation.dot
Normal file
8
doc/fig/instrumentation.dot
Normal file
@ -0,0 +1,8 @@
|
||||
digraph {
|
||||
rankdir = LR;
|
||||
|
||||
Execution, Emulation, Visualization [ shape = circle, width=1.5 ];
|
||||
"Event trace", "State trace", "Timeline" [ shape = box ];
|
||||
|
||||
Execution -> "Event trace" -> Emulation -> "State trace" -> Visualization -> "Timeline";
|
||||
}
|
||||
78
doc/fig/instrumentation.svg
Normal file
78
doc/fig/instrumentation.svg
Normal file
@ -0,0 +1,78 @@
|
||||
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
|
||||
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
|
||||
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
|
||||
<!-- Generated by graphviz version 5.0.0 (0)
|
||||
-->
|
||||
<!-- Pages: 1 -->
|
||||
<svg width="789pt" height="119pt"
|
||||
viewBox="0.00 0.00 788.54 118.54" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
|
||||
<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 114.54)">
|
||||
<polygon fill="white" stroke="transparent" points="-4,4 -4,-114.54 784.54,-114.54 784.54,4 -4,4"/>
|
||||
<!-- Execution -->
|
||||
<g id="node1" class="node">
|
||||
<title>Execution</title>
|
||||
<ellipse fill="none" stroke="black" cx="54" cy="-55.27" rx="54" ry="54"/>
|
||||
<text text-anchor="middle" x="54" y="-51.57" font-family="Times,serif" font-size="14.00">Execution</text>
|
||||
</g>
|
||||
<!-- Event trace -->
|
||||
<g id="node4" class="node">
|
||||
<title>Event trace</title>
|
||||
<polygon fill="none" stroke="black" points="244,-73.27 144,-73.27 144,-37.27 244,-37.27 244,-73.27"/>
|
||||
<text text-anchor="middle" x="194" y="-51.57" font-family="Times,serif" font-size="14.00">Event trace</text>
|
||||
</g>
|
||||
<!-- Execution->Event trace -->
|
||||
<g id="edge1" class="edge">
|
||||
<title>Execution->Event trace</title>
|
||||
<path fill="none" stroke="black" d="M108.35,-55.27C116.66,-55.27 125.28,-55.27 133.71,-55.27"/>
|
||||
<polygon fill="black" stroke="black" points="133.85,-58.77 143.85,-55.27 133.85,-51.77 133.85,-58.77"/>
|
||||
</g>
|
||||
<!-- Emulation -->
|
||||
<g id="node2" class="node">
|
||||
<title>Emulation</title>
|
||||
<ellipse fill="none" stroke="black" cx="334" cy="-55.27" rx="54" ry="54"/>
|
||||
<text text-anchor="middle" x="334" y="-51.57" font-family="Times,serif" font-size="14.00">Emulation</text>
|
||||
</g>
|
||||
<!-- State trace -->
|
||||
<g id="node5" class="node">
|
||||
<title>State trace</title>
|
||||
<polygon fill="none" stroke="black" points="520,-73.27 424,-73.27 424,-37.27 520,-37.27 520,-73.27"/>
|
||||
<text text-anchor="middle" x="472" y="-51.57" font-family="Times,serif" font-size="14.00">State trace</text>
|
||||
</g>
|
||||
<!-- Emulation->State trace -->
|
||||
<g id="edge3" class="edge">
|
||||
<title>Emulation->State trace</title>
|
||||
<path fill="none" stroke="black" d="M388.36,-55.27C396.72,-55.27 405.39,-55.27 413.83,-55.27"/>
|
||||
<polygon fill="black" stroke="black" points="413.97,-58.77 423.97,-55.27 413.97,-51.77 413.97,-58.77"/>
|
||||
</g>
|
||||
<!-- Visualization -->
|
||||
<g id="node3" class="node">
|
||||
<title>Visualization</title>
|
||||
<ellipse fill="none" stroke="black" cx="611.27" cy="-55.27" rx="55.04" ry="55.04"/>
|
||||
<text text-anchor="middle" x="611.27" y="-51.57" font-family="Times,serif" font-size="14.00">Visualization</text>
|
||||
</g>
|
||||
<!-- Timeline -->
|
||||
<g id="node6" class="node">
|
||||
<title>Timeline</title>
|
||||
<polygon fill="none" stroke="black" points="780.54,-73.27 702.54,-73.27 702.54,-37.27 780.54,-37.27 780.54,-73.27"/>
|
||||
<text text-anchor="middle" x="741.54" y="-51.57" font-family="Times,serif" font-size="14.00">Timeline</text>
|
||||
</g>
|
||||
<!-- Visualization->Timeline -->
|
||||
<g id="edge5" class="edge">
|
||||
<title>Visualization->Timeline</title>
|
||||
<path fill="none" stroke="black" d="M666.66,-55.27C675.11,-55.27 683.8,-55.27 692.1,-55.27"/>
|
||||
<polygon fill="black" stroke="black" points="692.38,-58.77 702.38,-55.27 692.38,-51.77 692.38,-58.77"/>
|
||||
</g>
|
||||
<!-- Event trace->Emulation -->
|
||||
<g id="edge2" class="edge">
|
||||
<title>Event trace->Emulation</title>
|
||||
<path fill="none" stroke="black" d="M244.04,-55.27C252.39,-55.27 261.17,-55.27 269.83,-55.27"/>
|
||||
<polygon fill="black" stroke="black" points="269.9,-58.77 279.9,-55.27 269.9,-51.77 269.9,-58.77"/>
|
||||
</g>
|
||||
<!-- State trace->Visualization -->
|
||||
<g id="edge4" class="edge">
|
||||
<title>State trace->Visualization</title>
|
||||
<path fill="none" stroke="black" d="M520.24,-55.27C528.49,-55.27 537.2,-55.27 545.82,-55.27"/>
|
||||
<polygon fill="black" stroke="black" points="545.86,-58.77 555.86,-55.27 545.86,-51.77 545.86,-58.77"/>
|
||||
</g>
|
||||
</g>
|
||||
</svg>
|
||||
|
After Width: | Height: | Size: 3.7 KiB |
|
Before Width: | Height: | Size: 142 KiB After Width: | Height: | Size: 142 KiB |
BIN
doc/fig/logo2.png
Normal file
BIN
doc/fig/logo2.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 118 KiB |
BIN
doc/fig/visualization.png
Normal file
BIN
doc/fig/visualization.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 20 KiB |
22
doc/index.md
22
doc/index.md
@ -1,4 +1,4 @@
|
||||
|
||||
|
||||
|
||||
This is the documentation of ovni, the Obtuse (but Versatile) Nanoscale
|
||||
Instrumentation project.
|
||||
@ -6,8 +6,8 @@ Instrumentation project.
|
||||
!!! Note
|
||||
|
||||
Preferably write the name of the project as lowercase *ovni*
|
||||
unless the grammar rules suggest otherwise, such as starting a
|
||||
new sentence.
|
||||
unless the grammar rules suggest otherwise, such as when
|
||||
starting a new sentence.
|
||||
|
||||
The ovni project implements a fast instrumentation library that records
|
||||
small events (starting at 12 bytes) during the execution of programs to
|
||||
@ -16,7 +16,7 @@ later investigate how the execution happened.
|
||||
The instrumentation process is split in two stages: [runtime](runtime)
|
||||
tracing and [emulation](emulation/).
|
||||
|
||||
During runtime, very simple and short events are stored on disk which
|
||||
During runtime, very short binary events are stored on disk which
|
||||
describe what is happening. Once the execution finishes, the events are
|
||||
read and processed to reproduce the execution during the emulation
|
||||
process, and the final execution trace is generated.
|
||||
@ -29,5 +29,15 @@ Each event belongs to a model, which has a direct mapping to a target
|
||||
library or program. Each model is independent of other models, and they
|
||||
can be instrumented concurrently.
|
||||
|
||||
The events are classified by using three identifiers known as *model*,
|
||||
*category* and *value* (or MCV for short).
|
||||
## Quick start
|
||||
|
||||
To start a trace follow these steps:
|
||||
|
||||
- First enable the instrumentation of those libraries or programs that
|
||||
you are interested in (see their documentation).
|
||||
- Then simply run the program normally. You will see a new `ovni`
|
||||
directory containing the runtime trace.
|
||||
- Finally run the `ovniemu ovni` command to generate the Paraver traces.
|
||||
- Use the command `wxparaver ovni/cpu.prv` to load the CPU trace.
|
||||
- Load the configurations from the `cfg/` directory that you are
|
||||
interested in, to open a timeline view.
|
||||
|
||||
BIN
doc/logo2.png
BIN
doc/logo2.png
Binary file not shown.
|
Before Width: | Height: | Size: 113 KiB |
|
Before Width: | Height: | Size: 44 KiB After Width: | Height: | Size: 44 KiB |
|
Before Width: | Height: | Size: 40 KiB After Width: | Height: | Size: 40 KiB |
|
Before Width: | Height: | Size: 26 KiB After Width: | Height: | Size: 26 KiB |
|
Before Width: | Height: | Size: 18 KiB After Width: | Height: | Size: 18 KiB |
@ -1,8 +1,9 @@
|
||||
# Trace specification
|
||||
|
||||
!!! Note
|
||||
!!! Important
|
||||
|
||||
Thie is the trace specification for the version 1
|
||||
This document refers to the trace specification for
|
||||
the version 1
|
||||
|
||||
The ovni instrumentation library stores the information collected in a
|
||||
trace following the specification of this document.
|
||||
@ -83,7 +84,7 @@ the variable size events just after the header.
|
||||
The header contains the magic 4 bytes of "ovni" and a version number of
|
||||
4 bytes too. Here is a figure of the data stored in disk:
|
||||
|
||||
<img src="stream.svg" alt="Stream" width="400px"/>
|
||||
|
||||
|
||||
Similarly, events have a fixed size header followed by an optional
|
||||
payload of varying size. The header has the following information:
|
||||
@ -103,7 +104,7 @@ There are two types of events, depending of the size needed for the
|
||||
payload:
|
||||
|
||||
- Normal events: with a payload up to 16 bytes
|
||||
- Jumbo events: with a payload up to 2^32 bytes
|
||||
- Jumbo events: with a payload up to $`2^{32}`$ bytes
|
||||
|
||||
## Normal events
|
||||
|
||||
@ -124,7 +125,7 @@ bytes:
|
||||
|
||||
And in the following figure you can see every field annotated:
|
||||
|
||||
<img src="event-normal.svg" alt="Normal event without payload" width="400px"/>
|
||||
|
||||
|
||||
Another example of a normal event with 16 bytes of payload, a total of
|
||||
28 bytes:
|
||||
@ -136,7 +137,7 @@ ff ff ff ff 00 00 00 00 00 00 00 00 |............|
|
||||
|
||||
In the following figure you can see each field annotated:
|
||||
|
||||
<img src="event-normal-payload.svg" alt="Normal event with payload content" width="400px"/>
|
||||
|
||||
|
||||
## Jumbo events
|
||||
|
||||
@ -161,7 +162,7 @@ data:
|
||||
|
||||
In the following figure you can see each field annotated:
|
||||
|
||||
<img src="event-jumbo.svg" alt="Jumbo event" width="400px"/>
|
||||
|
||||
|
||||
## Design considerations
|
||||
|
||||
@ -171,11 +172,13 @@ parser library would take no more than 2 days for a single developer.
|
||||
The size of the events has been designed to be small, with 12 bytes per
|
||||
event when no payload is used.
|
||||
|
||||
**Important:** The events are stored in disk following the endianness of
|
||||
the machine where they are generated. So a stream generated with a little
|
||||
endian machine would be different than on a big endian machine. We
|
||||
assume the same endiannes is used to write the trace at runtime and read
|
||||
it after, at the emulation process.
|
||||
!!! Caution
|
||||
|
||||
The events are stored in disk following the endianness of the
|
||||
machine where they are generated. So a stream generated with a
|
||||
little endian machine would be different than on a big endian
|
||||
machine. We assume the same endiannes is used to write the trace
|
||||
at runtime and read it after, at the emulation process.
|
||||
|
||||
The events are designed to be easily identified when looking at the
|
||||
raw stream in binary, as the MCV codes can be read as ASCII characters:
|
||||
|
||||
@ -1,6 +1,8 @@
|
||||
# Tracing a program
|
||||
# Tracing a new program
|
||||
|
||||
Read carefully this document before using libovni to generate a trace.
|
||||
Read carefully this document before using libovni to instrument a new
|
||||
component. There are a few rules you must follow to ensure the runtime
|
||||
trace is correct.
|
||||
|
||||
## Trace processes and threads
|
||||
|
||||
|
||||
15
mkdocs.yml
15
mkdocs.yml
@ -1,14 +1,25 @@
|
||||
site_name: ovni
|
||||
theme: readthedocs
|
||||
docs_dir: doc
|
||||
extra_css: [extra.css]
|
||||
theme:
|
||||
name: readthedocs
|
||||
sticky_navigation: false
|
||||
extra_javascript:
|
||||
- https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS-MML_HTMLorMML
|
||||
markdown_extensions:
|
||||
- admonition
|
||||
- attr_list
|
||||
- def_list
|
||||
- mdx_math:
|
||||
use_gitlab_delimiters: true
|
||||
enable_dollar_delimiter: true
|
||||
add_preview: true
|
||||
- toc:
|
||||
permalink: "#"
|
||||
separator: "_"
|
||||
nav:
|
||||
- index.md
|
||||
- concepts.md
|
||||
- 'Runtime':
|
||||
- runtime/tracing.md
|
||||
- runtime/kernel.md
|
||||
@ -20,3 +31,5 @@ nav:
|
||||
- emulation/nanos6.md
|
||||
- emulation/events.md
|
||||
- emulation/channels.md
|
||||
- 'Developer guide':
|
||||
- developer-guide/index.md
|
||||
|
||||
Loading…
Reference in New Issue
Block a user