Re: [PATCH v5 00/20] Introduce threaded trace streaming for basic perf record operation

[Namhyung Kim]

Hi Andi,

On Thu, May 6, 2021 at 7:17 AM Andi Kleen <ak@xxxxxxxxxxxxxxx> wrote:
>
>
> On 5/5/2021 11:20 PM, Namhyung Kim wrote:
> >
> > Do you have an idea how to improve it?
> >
> > I have to say again that I don't like merely adding more threads to
> > record.  Yeah, parallelizing the perf record is good, but we have to
> > think about the perf report (and others) too.
>
> perf report/script can be already parallelized with --time xx/x% and a
> simple shell script that runs multiple processes. While that's a bit
> awkward for interactive use it works fine for scripting. I use it all
> the time for PT batch processing for example. The real bottleneck we
> have is really record on systems with many CPUs (which are more and more
> common), and that can only be fixed with some variant of this patch kit.

Right, spreading partial analysis to multiple processes would work
for some use cases.  I also agree that parallelizing perf record is
more important, but if there's a way to improve perf report/script
we should try that too.

Thanks,
Namhyung