i#6426: Add schedule_stats tool #6442
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Adds a new analysis tool "schedule_stats" which computes characteristics of a core-sharded schedule. This is meant to help in understanding and studying the effects of varying the scheduler parameters. This initial version counts instructions, blocking and all syscalls, voluntary and direct switches, and direct requests, and computes derived statistics CSPKI, I/CS, %voluntary, and %direct switches. Failed direct requests can be inferred. The tool also records a string of letters representing input threads to help visualize the thread interleaving on each core. The number of instructions per leter is controlled by a new parameter -print_every. This string visualization has its limits as more than 26 inputs will wrap around, but this approach has been useful in our unit tests and other small runs. Adds a regression test which runs the checked-in threadsig trace. Issue: #6426
abhinav92003
approved these changes
Nov 10, 2023
…ultiple comments; Move prev_was_wait
…hedule-stats-tool
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Progress: we're down to just one test failing here. x86-32: it's the set of failures in #6417. |
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Adds a new analysis tool "schedule_stats" which computes characteristics of a core-sharded schedule. This is meant to help in understanding and studying the effects of varying the scheduler parameters.
This initial version counts instructions, blocking and all syscalls, voluntary and direct switches, and direct requests, and computes derived statistics CSPKI, I/CS, %voluntary, and %direct switches. Failed direct requests can be inferred.
The tool also records a string of letters representing input threads to help visualize the thread interleaving on each core. The number of instructions per leter is controlled by a new parameter -print_every. This string visualization has its limits as more than 26 inputs will wrap around, but this approach has been useful in our unit tests and other small runs.
Adds a regression test which runs the checked-in threadsig trace.
Issue: #6426