On Thursday, August 11, 2016 at 12:57:27 AM UTC+3, Dominique Pelle wrote:
> Ramel Eshed ]wrote:
>
> > Hi Bram,
> >
> > I noticed that using system() function has an overhead of 0.2 seconds
> > (checked on RHEL 5.5) while using job_start() is 10 times faster (from
> > job_start to close_cb). Is this because of system() is using temp files
> > instead of pipes? This is a noticeable delay.
> >
> > Thanks,
> > Ramel
>
> I'm guessing that system() is slower because it starts a shell process
> and that shell process parses and runs the command. The shell may
> even run some file like .profile (not sure) before running your command.
>
> Whereas job_start() is I suppose doing a fork() + exec() (i.e. no shell
> process) so it is faster.
>
> To have more comparable speed, you'd need to measure something like:
>
> - job_start(["/bin/sh", "-c" "date")
> - system('date')
>
> Dominique
Hi Dominique,
job_start(["/bin/sh", "-c" "date") takes almost the same as when using 'date'
directly (maybe few ms more).
Ramel
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