From: David Ahern <dsahern@gmail.com>
To: wufei <at.wufei@gmail.com>, linux-perf-users@vger.kernel.org
Subject: Re: Found unknown events
Date: Mon, 04 Nov 2013 22:04:24 -0700 [thread overview]
Message-ID: <52787C58.7030100@gmail.com> (raw)
In-Reply-To: <CAGTy5_T+8sY4s+Lp6WhNwjtodqRJs2imd8i6_+7PvvnUf_zQnA@mail.gmail.com>
On 11/4/13, 7:40 AM, wufei wrote:
> Hello All,
>
> I am using perf to measure a multi-threaded program on kernel 3.2.23,
> the system has 40 cores and there are lots of context switches during
> the test. The command is:
> # perf record -e sched:sched_stat_sleep -e sched:sched_switch -e
> sched:sched_process_exit -g -r 0 -p 39249 sleep 5
> It generates a ~1GB size perf.data. `perf report` got 2 issues:
>
> 1. A lot of this warning message:
> Warning: Timestamp below last timeslice flush
What's the NUMA make up? multiple sockets?
>
> 2. No useful output, but this:
> Found 32117 unknown events!
Try increasing the mmap size. e.g., -m 2048. Does it decrease or remove
this stat?
David
next prev parent reply other threads:[~2013-11-05 5:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-04 14:40 Found unknown events wufei
2013-11-05 5:04 ` David Ahern [this message]
2013-11-05 6:44 ` wufei
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=52787C58.7030100@gmail.com \
--to=dsahern@gmail.com \
--cc=at.wufei@gmail.com \
--cc=linux-perf-users@vger.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.