From: Like Xu <like.xu.linux@gmail.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
Davidlohr Bueso <dave@stgolabs.net>
Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Ian Rogers <irogers@google.com>,
Namhyung Kim <namhyung@kernel.org>, Jiri Olsa <jolsa@kernel.org>
Subject: Re: [PATCH 19/28] perf bench: Add epoll parallel epoll_wait benchmark
Date: Mon, 29 Jul 2024 19:53:04 +0800 [thread overview]
Message-ID: <b37610b7-f0a2-4556-bb2c-367440eb9bae@gmail.com> (raw)
In-Reply-To: <20181122033611.15890-20-acme@kernel.org>
Hi guys,
On 11/22/18 11:36 AM, Arnaldo Carvalho de Melo wrote:
> + /* default to the number of CPUs and leave one for the writer pthread */
> + if (!nthreads)
> + nthreads = cpu->nr - 1;
If there is only one CPU (e.g. a virtualized VM with only one vCPU),
what is the correct test model for epoll_wait benchmark ?
Is the behavior the same as using -t to explicitly specify 1:
$ perf bench epoll wait -r 30 -t 1
or do we need:
nthreads = max(perf_cpu_map__nr(cpu) - 1, 1);
?
next prev parent reply other threads:[~2024-07-29 11:53 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-22 3:35 [GIT PULL 00/28] perf/core improvements and fixes Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 01/28] perf bpf: Add unistd.h to the headers accessible to bpf proggies Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 02/28] perf augmented_syscalls: Filter on a hard coded pid Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 03/28] perf augmented_syscalls: Remove needless linux/socket.h include Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 04/28] perf bpf: Add defines for map insertion/lookup Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 05/28] perf bpf: Add simple pid_filter class accessible to BPF proggies Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 06/28] perf augmented_syscalls: Drop 'write', 'poll' for testing without self pid filter Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 07/28] perf augmented_syscalls: Use pid_filter Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 08/28] perf evlist: Rename perf_evlist__set_filter* to perf_evlist__set_tp_filter* Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 09/28] perf trace: Add "_from_option" suffix to trace__set_filter() Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 10/28] perf trace: See if there is a map named "filtered_pids" Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 11/28] perf trace: Fill in BPF "filtered_pids" map when present Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 12/28] perf augmented_syscalls: Remove example hardcoded set of filtered pids Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 13/28] Revert "perf augmented_syscalls: Drop 'write', 'poll' for testing without self pid filter" Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 14/28] perf script: Add newline after uregs output Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 15/28] perf bpf: Reduce the hardcoded .max_entries for pid_maps Arnaldo Carvalho de Melo
2018-11-22 3:35 ` [PATCH 16/28] perf script: Share code and output format for uregs and iregs output Arnaldo Carvalho de Melo
2018-11-22 3:36 ` [PATCH 17/28] perf bench: Move HAVE_PTHREAD_ATTR_SETAFFINITY_NP into bench.h Arnaldo Carvalho de Melo
2018-11-22 3:36 ` [PATCH 18/28] tools build feature: Check if eventfd() is available Arnaldo Carvalho de Melo
2018-11-22 3:36 ` [PATCH 19/28] perf bench: Add epoll parallel epoll_wait benchmark Arnaldo Carvalho de Melo
2024-07-29 11:53 ` Like Xu [this message]
2018-11-22 3:36 ` [PATCH 20/28] perf bench: Add epoll_ctl(2) benchmark Arnaldo Carvalho de Melo
2018-11-22 3:36 ` [PATCH 21/28] perf tools: Add Hygon Dhyana support Arnaldo Carvalho de Melo
2018-11-22 3:36 ` [PATCH 22/28] perf pmu: Suppress potential format-truncation warning Arnaldo Carvalho de Melo
2018-11-22 3:36 ` [PATCH 23/28] perf stat: Use perf_evsel__is_clocki() for clock events Arnaldo Carvalho de Melo
2018-11-22 3:36 ` [PATCH 24/28] perf vendor events: Add stepping in CPUID string for x86 Arnaldo Carvalho de Melo
2018-11-22 3:36 ` [PATCH 26/28] perf jvmti: Separate jvmti cmlr check Arnaldo Carvalho de Melo
2018-11-22 3:36 ` [PATCH 27/28] perf symbols: Fix slowness due to -ffunction-section Arnaldo Carvalho de Melo
2018-11-22 3:36 ` [PATCH 28/28] perf pmu: Move *_cpuid_str() weak functions to header.c Arnaldo Carvalho de Melo
2018-11-22 6:54 ` [GIT PULL 00/28] perf/core improvements and fixes Ingo Molnar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=b37610b7-f0a2-4556-bb2c-367440eb9bae@gmail.com \
--to=like.xu.linux@gmail.com \
--cc=acme@kernel.org \
--cc=dave@stgolabs.net \
--cc=irogers@google.com \
--cc=jolsa@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-perf-users@vger.kernel.org \
--cc=namhyung@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).