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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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