2012-10-13 15:54:23

by abhishek agarwal

Subject: [Perf] Adding timeout option

Hi folks..

I was thinking that why cant we have a timeout option in perf stat
command. The timeout feature will help us to profile a process for a
stipulated time (preferably in millisecs) and make perf stat return
after that time.

Eg:

perf stat --timeout=10 sleep 100

This will make perf return and report stats after 10 ms...

Hope anyone can shed some more light on the idea

Thanks & Regards,
Abhishek Agarwal

2012-10-20 16:57:39

by Pádraig Brady

Subject: Re: [Perf] Adding timeout option

On 10/13/2012 08:54 AM, abhishek agarwal wrote:
> Hi folks..
>
> I was thinking that why cant we have a timeout option in perf stat
> command. The timeout feature will help us to profile a process for a
> stipulated time (preferably in millisecs) and make perf stat return
> after that time.
> Eg:
>
> perf stat --timeout=10 sleep 100
>
> This will make perf return and report stats after 10 ms...
>
> Hope anyone can shed some more light on the idea

It seems preferable to use the timeout program to do this.
Either sending a handled signal to the perf process like:

timeout -s HUP 10 perf stat sleep 100

Or even better, just use that to kill the monitored process itself

perf stat timeout 10 sleep 100

cheers,
P?draig.

2012-10-21 04:18:12

by abhishek agarwal

Subject: Re: [Perf] Adding timeout option

sleep does not offer a good timeout resolution and it is not a good
option (according to me) either.
perfmon had "timeout" option and i guess, same do oprofile.

On Sat, Oct 20, 2012 at 1:58 AM, P?draig Brady <[email protected]> wrote:
> On 10/13/2012 08:54 AM, abhishek agarwal wrote:
>>
>> Hi folks..
>>
>> I was thinking that why cant we have a timeout option in perf stat
>> command. The timeout feature will help us to profile a process for a
>> stipulated time (preferably in millisecs) and make perf stat return
>> after that time.
>> Eg:
>>
>> perf stat --timeout=10 sleep 100
>>
>> This will make perf return and report stats after 10 ms...
>>
>> Hope anyone can shed some more light on the idea
>
>
> It seems preferable to use the timeout program to do this.
> Either sending a handled signal to the perf process like:
>
> timeout -s HUP 10 perf stat sleep 100
>
> Or even better, just use that to kill the monitored process itself
>
> perf stat timeout 10 sleep 100
>
> cheers,
> P?draig.

2012-10-22 11:02:53

by Pádraig Brady

Subject: Re: [Perf] Adding timeout option

On 10/21/2012 05:18 AM, abhishek agarwal wrote:

> perfmon had "timeout" option and i guess, same do oprofile.
>
> On Sat, Oct 20, 2012 at 1:58 AM, P?draig Brady <[email protected]> wrote:
>> On 10/13/2012 08:54 AM, abhishek agarwal wrote:
>>>
>>> Hi folks..
>>>
>>> I was thinking that why cant we have a timeout option in perf stat
>>> command. The timeout feature will help us to profile a process for a
>>> stipulated time (preferably in millisecs) and make perf stat return
>>> after that time.
>>> Eg:
>>>
>>> perf stat --timeout=10 sleep 100
>>>
>>> This will make perf return and report stats after 10 ms...
>>>
>>> Hope anyone can shed some more light on the idea
>>
>>
>> It seems preferable to use the timeout program to do this.
>> Either sending a handled signal to the perf process like:
>>
>> timeout -s HUP 10 perf stat sleep 100
>>
>> Or even better, just use that to kill the monitored process itself
>>
>> perf stat timeout 10 sleep 100

> sleep does not offer a good timeout resolution and it is not a good
> option (according to me) either.

sleep was just following on the command example.
timeout(1) supports subsecond resolution,
through timer_create (CLOCK_REALTIME...) and
timeout indication through signals.

thanks,
P?draig.