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SubjectRe: [tip:perf/core] perf tools: Allow multiple threads or processes in record, stat, top
That first cup of coffee is so important.

On 3/2/12 3:56 AM, Ingo Molnar wrote:
> phoenix:~> perf record -a sleep 1
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.023 MB perf.data (~988 samples) ]
> phoenix:~> perf report --stdio
> Warning:
> The perf.data file has no samples!
> # ========
> # captured on: Fri Mar 2 12:01:41 2012
> # hostname : phoenix
> # os release : 3.3.0-rc5+
> # perf version : 3.3.rc5.1698.g68a63a.dirty
> # arch : x86_64
> # nrcpus online : 16
> # nrcpus avail : 16
> # cpudesc : Quad-Core AMD Opteron(tm) Processor 8356
> # cpuid : AuthenticAMD,16,2,3

Would you mind adding this patch:
https://lkml.org/lkml/2012/2/29/217
and see if it fixes your problem?

Quick test with an updated tree:
$ /tmp/pbuild/perf record -a sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.046 MB perf.data (~1990 samples) ]

$ /tmp/pbuild/perf script
<samples dumped>

$ /tmp/pbuild/perf --version
perf version perf.core.for.mingo.36.g8eedce

This is your tip.git repository, tip/perf/core branch:

[remote "tip"]
url = git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
fetch = +refs/heads/*:refs/remotes/tip/*
[branch "tip-perf-core"]
remote = tip
merge = refs/heads/perf/core
I did noticed that this branch only shows 3.3.0-rc2 as the latest kernel
version.

> # total memory : 33012240 kB
> # cmdline : /home/mingo/bin/perf record -a sleep 1
> # event : name = cycles, type = 0, config = 0x0, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_k
> # HEADER_CPU_TOPOLOGY info available, use -I to display
> # HEADER_NUMA_TOPOLOGY info available, use -I to display
> # ========
> phoenix:~> perf --version
> perf version 3.3.rc5.1698.g68a63a.dirty
> phoenix:~>
>
> The later fixes to b52956c9, such as:
>
> 6b1bee9035d4: perf tools: fix broken perf record -a mode
>
> did not fix this system - it's still broken as of today's -tip.
>
> Another system running the same kernel does not exhibit this
> problem, so it's somehow specific to this system.

Is the other system Intel based?

David


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