rarias/ovni
rarias/ovni
1
0
Fork 0
Code Issues Pull Requests 1 Actions Packages Projects Releases Wiki Activity

Document the breakdown view

Browse Source
This commit is contained in:
Rodrigo Arias 2023-03-27 11:47:33 +02:00 committed by Rodrigo Arias Mallo
parent c30a5d94b5
commit 14dc70c6a2
2 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

BIN
doc/user/emulation/fig/breakdown.png Normal file
View File

Binary file not shown.
Side by Side

After

Width:  |  Height:  |  Size: 33 KiB

24
doc/user/emulation/nanos6.md
View File

@ -200,6 +200,30 @@ The complete list of subsystems and sections is shown below.
subsystem in Nanos6. Tasks will continue to be in the running state until
paused or finished.
## Breakdown view (experimental)
The breakdown view shows the **number** of CPUs in a given state, stacking
similar states together. Its a mix of the task type, subsystem and idle views.
!!! Important
This view is only generated with the `-b` option of ovniemu. This
feature is experimental, new changes may break compatibility.
Here is an example of the Heat mini-app.
![Breakdown example](fig/breakdown.png)
The *Idle* state shows when a CPU has no threads running or when the worker is
Stalled (is not making progress). Below the Idle state the tasks are shown by
their label, in this case only *block computation* is running. Above the Idle
state, the runtime subsystems are shown.
This view gives a quick overview of the usage of the CPUs over time and which
tasks are taking more time. It also shows which sections are unable to use all
the CPUs, showing potential problems with the parallelization. In this example
not all the CPUs can be filled with *block computation* tasks.
## Limitations
The task for clause is partially supported, as currently the emulator uses a