On 2/20/2019 7:35 AM, David Laight wrote:
From: Sent: 16 February 2019 12:56
To: Li, Aubrey
...
The above experiment just confirms what I said: The numbers are inaccurate
and potentially misleading to a large extent when the AVX using task is not
scheduled out for a longer time.
Not only
From: Sent: 16 February 2019 12:56
> To: Li, Aubrey
...
> The above experiment just confirms what I said: The numbers are inaccurate
> and potentially misleading to a large extent when the AVX using task is not
> scheduled out for a longer time.
Not only that, they won't detect programs that use
On 2019/2/16 20:55, Thomas Gleixner wrote:
> On Fri, 15 Feb 2019, Li, Aubrey wrote:
>> On 2019/2/14 19:29, Thomas Gleixner wrote:
>> Under this scenario, the elapsed time becomes longer than normal indeed, see
>> below:
>>
>> $ while [ 1 ]; do cat /proc/6985/status | grep AVX; sleep 1; done
>>
On Fri, 15 Feb 2019, Li, Aubrey wrote:
> On 2019/2/14 19:29, Thomas Gleixner wrote:
> Under this scenario, the elapsed time becomes longer than normal indeed, see
> below:
>
> $ while [ 1 ]; do cat /proc/6985/status | grep AVX; sleep 1; done
> AVX512_elapsed_ms:3432
> AVX512_elapsed_ms:
On 2019/2/14 19:29, Thomas Gleixner wrote:
> On Wed, 13 Feb 2019, Aubrey Li wrote:
>
>> AVX-512 components use could cause core turbo frequency drop. So
>> it's useful to expose AVX-512 usage elapsed time as a heuristic hint
>> for the user space job scheduler to cluster the AVX-512 using tasks
On Wed, 13 Feb 2019, Aubrey Li wrote:
> AVX-512 components use could cause core turbo frequency drop. So
> it's useful to expose AVX-512 usage elapsed time as a heuristic hint
> for the user space job scheduler to cluster the AVX-512 using tasks
> together.
>
> Example:
> $ cat /proc/pid/status
AVX-512 components use could cause core turbo frequency drop. So
it's useful to expose AVX-512 usage elapsed time as a heuristic hint
for the user space job scheduler to cluster the AVX-512 using tasks
together.
Example:
$ cat /proc/pid/status | grep AVX512_elapsed_ms
AVX512_elapsed_ms: 1020
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