From: Alexey Budankov <alexey.budankov@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>,
Andi Kleen <ak@linux.intel.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org, Jiri Olsa <jolsa@kernel.org>,
adrian.hunter@intel.com
Subject: Re: [PATCH 1/2] perf: Add closing sibling events' file descriptors
Date: Tue, 11 Aug 2020 11:12:39 +0300 [thread overview]
Message-ID: <d9389142-1065-0769-33b4-0f97e5d6eca4@linux.intel.com> (raw)
In-Reply-To: <20200810203632.GF3982@worktop.programming.kicks-ass.net>
On 10.08.2020 23:36, Peter Zijlstra wrote:
> On Mon, Aug 10, 2020 at 07:45:18AM -0700, Andi Kleen wrote:
>
>> Unfortunately we're kind of stuck with the old NFILE=1024 default
>> even though it makes little sense on modern servers.
>
> Why can't that be changed? It seems to me all of userspace changes all
> the time; heck that system-doofus thing flushed 20+ years of sysadmin
> experience down the drain, just cause. Why can't we up a file limit?
>
If you asked me I would say that
Intel VTune HW micro architecture analysis would also be unblocked
by pushing RLIMIT_NOFILE limit beyond its current 1K default.
Currently rule of thumb for VTune users is to set the limit to
value == #cores X # events. The recommended value is 64K [1].
BR,
Alexei
[1] https://software.intel.com/content/www/us/en/develop/documentation/vtune-cookbook/top/configuration-recipes/profiling-hardware-without-sampling-drivers.html
next prev parent reply other threads:[~2020-08-11 8:12 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-08 15:16 [PATCH 0/2] perf: Allow closing siblings' " Alexander Shishkin
2020-07-08 15:16 ` [PATCH 1/2] perf: Add closing sibling events' " Alexander Shishkin
2020-08-06 8:35 ` peterz
2020-08-06 15:32 ` Andi Kleen
2020-08-10 13:57 ` Alexander Shishkin
2020-08-10 14:45 ` Andi Kleen
2020-08-10 20:36 ` Peter Zijlstra
2020-08-11 8:12 ` Alexey Budankov [this message]
2020-08-11 14:29 ` Andi Kleen
2020-08-11 14:47 ` David Laight
2020-08-11 18:03 ` Andi Kleen
2020-08-11 21:06 ` David Laight
2020-08-11 9:47 ` Alexander Shishkin
2020-08-11 14:34 ` Andi Kleen
2020-08-11 16:21 ` Alexander Shishkin
2020-08-11 18:02 ` Andi Kleen
2020-07-08 15:16 ` [PATCH 2/2] perf record: Support closing siblings' " Alexander Shishkin
2020-07-08 21:09 ` Jiri Olsa
2020-07-16 8:42 ` [perf record] d65f0cbbc6: perf-sanity-tests.Setup_struct_perf_event_attr.fail kernel test robot
2020-07-09 8:30 ` [PATCH 0/2] perf: Allow closing siblings' file descriptors Alexey Budankov
2020-08-06 6:15 ` Adrian Hunter
2020-08-06 8:37 ` peterz
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