Nevermind, I was able to get root access on the machines. I have a
different problem now, though -- it reports all of the per-CPU counts
as 0. On a two-threaded program:
$ ./task -e core::INSTRUCTIONS_RETIRED:u -- ~/tests/perfmttest/base
2,000,260,890 core::INSTRUCTIONS_RETIRED:u (0.00% scaling,
ena=666,006,077, run=666,006,077)
$ ./task -i -e core::INSTRUCTIONS_RETIRED:u -- ~/tests/perfmttest/base
4,000,335,689 core::INSTRUCTIONS_RETIRED:u (0.00% scaling,
ena=1,318,628,553, run=1,318,628,553)
$ ./task_cpu -i -e core::INSTRUCTIONS_RETIRED:u -- ~/tests/perfmttest/base
CPU0 0 core::INSTRUCTIONS_RETIRED:u (100.00%
scaling, ena=0, run=0)
CPU1 0 core::INSTRUCTIONS_RETIRED:u (100.00%
scaling, ena=0, run=0)
CPU2 0 core::INSTRUCTIONS_RETIRED:u (100.00%
scaling, ena=0, run=0)
CPU3 0 core::INSTRUCTIONS_RETIRED:u (100.00%
scaling, ena=0, run=0)
CPU4 0 core::INSTRUCTIONS_RETIRED:u (100.00%
scaling, ena=0, run=0)
CPU5 0 core::INSTRUCTIONS_RETIRED:u (100.00%
scaling, ena=0, run=0)
CPU6 0 core::INSTRUCTIONS_RETIRED:u (100.00%
scaling, ena=0, run=0)
CPU7 0 core::INSTRUCTIONS_RETIRED:u (100.00%
scaling, ena=0, run=0)
It's not printing any error messages, so I'm not sure where to start
debugging it. Could it be a kernel issue? task_cpu worked fine for
me on my desktop, which is CentOS with a 2.6.33 kernel, but this
server is Ubuntu with 2.6.32. In both cases, I have the most recent
git tree.
-dan
On Fri, Jul 15, 2011 at 6:13 PM, Dan Upton <up...@virginia.edu> wrote:
> Ah, okay, it had occurred to me that might be the case, but I don't
> have root on that machine so I couldn't test it before asking on the
> list. Is there a way to uniquely measure a multithreaded application
> that doesn't require root? I tried just using something like task or
> task_smpl, but on a pthread application with two threads it only
> appears to monitor the main thread and not the worker child (based on
> a comparison of instruction count from task and from Pin).
>
> -dan
>
> On Fri, Jul 15, 2011 at 5:03 PM, Vince Weaver <vweav...@eecs.utk.edu> wrote:
>> On Fri, 15 Jul 2011, Dan Upton wrote:
>>
>>> I'm trying to monitor some multithreaded applications and I just found
>>> the task_cpu example tool. I can't get it to attach to any program
>>> though, single or multithreaded, even something as simple as ls:
>>>
>>> $ ./task_cpu -- /bin/ls
>>> task_cpu: cannot attach event0 PERF_COUNT_HW_CPU_CYCLES: Permission denied
>>>
>>> However, task_smpl and task work fine. Is something special required
>>> to get task_cpu to work?
>>
>> For security reasons you need root permission to access the CPU-level
>> counters. This is because when you monitor CPU-wide you monitor *all*
>> processes on the CPU, including ones that don't belong to you.
>>
>> Vince
>>
>
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