i#6471 sched idle: Add idle time #6472
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Adds a new STATUS_IDLE return code, and a corresponding TRACE_MARKER_TYPE_CORE_IDLE record. Changes the scheduler behavior to no longer return STATUS_EOF for an output when the ready queue is empty: instead STATUS_IDLE is returned until every single input is at EOF. This results in a more realistic schedule where other cores can pick up work later rather than disappearing from the system. Augments the schedule_stats tool to count idle replies and compute a % cpu usage metric. Adds a unit test for counting idles. Augments the scheduler_launcher to also compute %cpu usage. Updates all the scheduler tests for the new change. Adding idle time due to blocking syscalls will be done separately. Issue: #6471
abhinav92003
approved these changes
Nov 27, 2023
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RISCV is suddenly failing: |
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x32 are the AMD 32-bit failures #6417 |
derekbruening
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Nov 29, 2023
Adds a fallback to return EOF when all outputs are past the last record in replay mode, to handle a schedule where not every input reaches EOF or has regions of interest. Adds a unit test for this case, which hangs without the fix. Fixes a record bug which seems to cause the final segment entry for an input to have a stop instruction ordinal prior to the input's real endpoint. This is what caused hangs in actual usage of PR #6472 and led to adding the fallback just described (which is useful on its own). On selecting a new input which turned out to be at EOF, the original code called close_schedule_segment() on *prev_input* for some reason. That replaces the default -1 sentinel (read to EOF) with the current ordinal. The code then tries again for a new input, but if it ends up finding the prior one it would keep executing that without a new schedule segment entry. If that's the last input on that core, close_schedule_segment() is not called (the default is relied upon). I observed missing sentinels for one input in some runs and this is my theory as to what happened; those cases are gone now with this fix. Unfortunately it is difficult to create a unit test for this, but testing on the original hangs (without the fallback) show it fixed. Issue: #6471
derekbruening
added a commit
that referenced
this pull request
Nov 29, 2023
Adds a fallback to return EOF when all outputs are past the last record in replay mode, to handle a schedule where not every input reaches EOF or has regions of interest. Adds a unit test for this case, which hangs without the fix. Fixes a record bug which seems to cause the final segment entry for an input to have a stop instruction ordinal prior to the input's real endpoint. This is what caused hangs in actual usage of PR #6472 and led to adding the fallback just described (which is useful on its own). On selecting a new input which turned out to be at EOF, the original code called close_schedule_segment() on *prev_input* for some reason. That replaces the default -1 sentinel (read to EOF) with the current ordinal. The code then tries again for a new input, but if it ends up finding the prior one it would keep executing that without a new schedule segment entry. If that's the last input on that core, close_schedule_segment() is not called (the default is relied upon). I observed missing sentinels for one input in some runs and this is my theory as to what happened; those cases are gone now with this fix. Unfortunately it is difficult to create a unit test for this, but testing on the original hangs (without the fallback) show it fixed. Issue: #6471
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Adds a new STATUS_IDLE return code, and a corresponding TRACE_MARKER_TYPE_CORE_IDLE record.
Changes the scheduler behavior to no longer return STATUS_EOF for an output when the ready queue is empty: instead STATUS_IDLE is returned until every single input is at EOF. This results in a more realistic schedule where other cores can pick up work later rather than disappearing from the system.
Augments the schedule_stats tool to count idle replies and compute a % cpu usage metric. Adds a unit test for counting idles.
Augments the scheduler_launcher to also compute %cpu usage.
Updates all the scheduler tests for the new change.
Adding idle time due to blocking syscalls will be done separately.
Issue: #6471