Resending - previously, I forgot to send the message in the plain text
mode. I'm sorry.
Hi Mel,
Thanks a lot for looking into this!
Our results are mostly in line with what you see. We observe big gains
(20-50%) when the system is loaded to 1/3 of the maximum capacity and
mixed results at the fu
On Thu, Sep 10, 2020 at 11:50:04PM +0200, Jirka Hladky wrote:
> 1) Threads stability has improved a lot. We see much fewer threads
> migrations. Check for example this heatmap based on the mpstat results
> collected while running sp.C test from the NAS benchmark. sp.C was run
> with 16 threads on a
Hi Hilf and Mel,
thanks a lot for bringing this to my attention. We have tested the
proposed patch and we are getting excellent results so far!
1) Threads stability has improved a lot. We see much fewer threads
migrations. Check for example this heatmap based on the mpstat results
collected while
> >
> > On Mon, Sep 07, 2020 at 07:27:08PM +1200, Barry Song wrote:
> > > Something is wrong. In find_busiest_group(), we are checking if src has
> > > higher load, however, in task_numa_find_cpu(), we are checking if dst
> > > will have higher load after balancing. It seems it is not sensible to
t.com; pet...@infradead.org; juri.le...@redhat.com;
> > vincent.guit...@linaro.org; dietmar.eggem...@arm.com;
> > bseg...@google.com; linux-kernel@vger.kernel.org; Linuxarm
> > ; Mel Gorman ;
> > Peter Zijlstra ; Valentin Schneider
> > ; Phil Auld ; Hillf Danton
> >
t; bseg...@google.com; linux-kernel@vger.kernel.org; Linuxarm
> ; Mel Gorman ;
> Peter Zijlstra ; Valentin Schneider
> ; Phil Auld ; Hillf Danton
> ; Ingo Molnar
> Subject: Re: [PATCH] sched/fair: use dst group while checking imbalance for
> NUMA balancer
>
> On Mon, Sep 0
On Mon, Sep 07, 2020 at 07:27:08PM +1200, Barry Song wrote:
> Something is wrong. In find_busiest_group(), we are checking if src has
> higher load, however, in task_numa_find_cpu(), we are checking if dst
> will have higher load after balancing. It seems it is not sensible to
> check src.
> It may
Something is wrong. In find_busiest_group(), we are checking if src has
higher load, however, in task_numa_find_cpu(), we are checking if dst
will have higher load after balancing. It seems it is not sensible to
check src.
It maybe cause wrong imbalance value, for example, if
dst_running = env->dst
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