trace-v3 #7
@ -3,7 +3,7 @@
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|||||||
When using libovni to generate traces or the emulator to process them, there are
|
When using libovni to generate traces or the emulator to process them, there are
|
||||||
several concepts to keep in mind.
|
several concepts to keep in mind.
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||||||
|
|
||||||
## Trace
|
## Trace elements
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||||||
|
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||||||
The information generated by a program or later processed by other ovni tools is
|
The information generated by a program or later processed by other ovni tools is
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||||||
known as a trace. A runtime trace stores the information as-is in disk from a
|
known as a trace. A runtime trace stores the information as-is in disk from a
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||||||
@ -13,7 +13,30 @@ for visualization with Paraver.
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|||||||
Both runtime and emulation traces are always stored inside the same directory,
|
Both runtime and emulation traces are always stored inside the same directory,
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||||||
by default `ovni/`, which is known as the *trace directory*.
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by default `ovni/`, which is known as the *trace directory*.
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||||||
|
|
||||||
## Event
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Here are the components of a runtime trace, as generated by libovni:
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||||||
|
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||||||
|
<p align="center">
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||||||
|
<img alt="Trace concepts" src="../trace.svg">
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||||||
|
</p>
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||||||
|
|
||||||
|
### Stream
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||||||
|
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||||||
|
A stream is a directory which contains a binary stream and the associated stream
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||||||
|
metadata file. Each stream is associated with a given part of a system. As of
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||||||
|
now, libovni can only generate streams associated to [threads](part-model.md#thread).
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||||||
|
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||||||
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### Stream metadata
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||||||
|
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||||||
|
The stream metadata is a JSON file named `stream.json` which holds information
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||||||
|
about the stream itself.
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||||||
|
|
||||||
|
### Binary stream
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||||||
|
|
||||||
|
A binary stream is a file named `stream.obs` (.obs stands for Ovni Binary
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||||||
|
Stream) composed of a header and a concatenated array of events without padding.
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||||||
|
Notice that each event may have different length.
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||||||
|
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||||||
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### Event
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||||||
|
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||||||
An event is a point in time that has some information associated. Events written
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An event is a point in time that has some information associated. Events written
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||||||
at runtime by libovni have at MCV, a clock and a optional payload. The list of
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at runtime by libovni have at MCV, a clock and a optional payload. The list of
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||||||
@ -39,18 +62,7 @@ $ ovnidump ovni/loom.hop.nosv-u1000/proc.1121064 | grep -A 10 VTx | head
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|||||||
There are two types or events: normal and jumbo events, the latter can hold
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There are two types or events: normal and jumbo events, the latter can hold
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||||||
large attached payloads.
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large attached payloads.
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||||||
|
|
||||||
## State
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### MCV
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||||||
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||||||
A state is a discrete value that can change over time based on the events the
|
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||||||
emulator receives. Usually a single event causes a single state change, which is
|
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||||||
then written to the Paraver traces. An example is the thread state, which can
|
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||||||
change over time based on the events `OH*` that indicate a state transition
|
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||||||
of the current thread.
|
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||||||
|
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||||||
In contrast with an event, states have a duration associated which can usually
|
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||||||
be observed in Paraver.
|
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||||||
|
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||||||
## MCV
|
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||||||
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||||||
The MCV acronym is the abbreviation of Model-Class-Value, which are a three
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The MCV acronym is the abbreviation of Model-Class-Value, which are a three
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||||||
characters that identify any event. The MCV is shown in the ovnitop and ovnidump
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characters that identify any event. The MCV is shown in the ovnitop and ovnidump
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||||||
@ -66,7 +78,7 @@ VTp 1
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|||||||
VTr 1
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VTr 1
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||||||
```
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```
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||||||
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||||||
## Clock
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### Clock
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||||||
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||||||
A clock is a 64 bit counter, which counts the number of nanoseconds from an
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A clock is a 64 bit counter, which counts the number of nanoseconds from an
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||||||
arbitrary point in time in the past. Each event has the value of the clock
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arbitrary point in time in the past. Each event has the value of the clock
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||||||
@ -76,34 +88,36 @@ corrected so they all produce an ordered sequence of events. The ovnisync
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|||||||
program performs this correction by measuring the difference across clocks of
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program performs this correction by measuring the difference across clocks of
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||||||
different nodes.
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different nodes.
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||||||
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||||||
## Event model
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### Payload
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||||||
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||||||
An event model is composed of several components:
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||||||
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||||||
- A set of [events](#event) all with the same model identifier in the
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||||||
[MCV](#mcv)
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||||||
- The emulator code that processes those events.
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||||||
- A human readable name, like `ovni` or `nanos6`.
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||||||
## Payload
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||||||
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||||||
Events may have associated additional information which is stored in the stream.
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Events may have associated additional information which is stored in the stream.
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||||||
Normal events can hold up to 16 bytes, otherwise the jumbo events must be used
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Normal events can hold up to 16 bytes, otherwise the jumbo events must be used
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||||||
to hold additional payload.
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to hold additional payload.
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||||||
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||||||
## Stream
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## Other related concepts
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||||||
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||||||
A stream is a directory which contains a binary stream and the associated stream
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Apart from the trace itself, there are other concepts to keep in mind when the
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||||||
metadata file. Each stream is associated with a given part of a system. As of
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trace is being processed by the emulator.
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||||||
now, libovni can only generate streams associated to [threads](part-model.md#thread).
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||||||
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||||||
## Binary stream
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### Event model
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A binary stream is a file named `stream.obs` (.obs stands for Ovni Binary
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Each event belongs to an event model, as identified by the model character in
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||||||
Stream) composed of a header and a concatenated array of events without padding.
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the MCV. An event model is composed of several components:
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||||||
Notice that each event may have different length.
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||||||
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||||||
## Stream metadata
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- A set of [events](#event) all with the same model identifier in the
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[MCV](#mcv)
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||||||
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- The emulator code that processes those events.
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||||||
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- A human readable name, like `ovni` or `nanos6`.
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||||||
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- A semantic version.
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||||||
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||||||
The stream metadata is a JSON file named `stream.json` which holds information
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### State
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||||||
about the stream itself.
|
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||||||
|
A state is a discrete value that can change over time based on the events the
|
||||||
|
emulator receives. Usually a single event causes a single state change, which is
|
||||||
|
then written to the Paraver traces. An example is the thread state, which can
|
||||||
|
change over time based on the events `OH*` that indicate a state transition
|
||||||
|
of the current thread.
|
||||||
|
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||||||
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In contrast with an event, states have a duration associated which can usually
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||||||
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be observed in Paraver. Notice that the trace only contains events, the states
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||||||
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are computed at emulation.
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||||||
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|||||||
474
doc/user/concepts/trace.svg
Normal file
474
doc/user/concepts/trace.svg
Normal file
@ -0,0 +1,474 @@
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After Width: | Height: | Size: 19 KiB |
Loading…
Reference in New Issue
Block a user