[petsc-users] Does PetscLogEventBegin and PetscLogEventEnd slow down the code if it's called every time step?

[TAY wee-beng]

Hi Barry and Matt

Thank you very much for the explanation.

Yours sincerely,

================================================
TAY Wee-Beng 郑伟明 (Zheng Weiming)
Personal research webpage: _http://tayweebeng.wixsite.com/website_
Youtube research showcase: _https://goo.gl/PtvdwQ_
linkedin: _https://www.linkedin.com/in/tay-weebeng_
================================================

On 22/4/2019 1:56 PM, Smith, Barry F. wrote:
>
>> On Apr 21, 2019, at 8:27 AM, TAY wee-beng via petsc-users <petsc-users at mcs.anl.gov> wrote:
>>
>> Hi,
>>
>> I'm trying to do some logging as well as timing of my code?
>>
>> May I know if PetscLogEventBegin and PetscLogEventEnd slow down my code if it's called every time step?
>     The logging is only done if the -log_view option is set or PetscLogDefaultBegin() is called.
>
>     Make two identical runs on the same machine once with -log_view, once without and time them. (use unix time on a work station and perhaps the patch system you use provides runtime information). Make the machines have the same load (or lack of load) on them to get a fair comparison. It would be very surprising if the -log_view version had a nontrivial effect on the run times.
>
>    Barry
>
>> -- 
>> Thank you very much.
>>
>> Yours sincerely,
>>
>> ================================================
>> TAY Wee-Beng 郑伟明 (Zheng Weiming)
>> Personal research webpage: http://tayweebeng.wixsite.com/website
>> Youtube research showcase: https://goo.gl/PtvdwQ
>> linkedin: https://www.linkedin.com/in/tay-weebeng
>> ================================================
>>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20190423/1ad1ff2d/attachment.html>