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Use sysconf to get the total online CPUs #175

Merged
merged 1 commit into from
Jun 3, 2024
Merged

Use sysconf to get the total online CPUs #175

merged 1 commit into from
Jun 3, 2024

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janaknat
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num_cpus does not return the total number of CPUs if aperf is taskset. Use sysconf to get the total number of online CPUs.

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num_cpus does not return the total number of CPUs if aperf is taskset.
Use sysconf to get the total number of online CPUs.
@janaknat janaknat requested a review from a team as a code owner May 30, 2024 20:47
@wash-amzn
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Do you have a reproducible example of this problem? I never ran into it.

@wash-amzn
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The bigger problem to solve here is the report of failures when the set of disabled CPUs isn't contiguous and at the end of the CPU list.

@janaknat
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janaknat commented Jun 3, 2024

Do you have a reproducible example of this problem? I never ran into it.

Run aperf with taskset. Ex: taskset 1 ./aperf record. The perf stat values are limited to only one CPU.

@wash-amzn
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Do you have a reproducible example of this problem? I never ran into it.

Run aperf with taskset. Ex: taskset 1 ./aperf record. The perf stat values are limited to only one CPU.

That is not my experience. I was doing many runs with taskset and aperf recorded all CPUs normally.

@janaknat janaknat merged commit 49b553b into main Jun 3, 2024
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@janaknat janaknat deleted the num-cpus-remove branch June 20, 2024 21:07
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2 participants