On 4 October 2017 at 00:21, milist ujang <ujang.milist@gmail.com> wrote:
> On Tue, Oct 3, 2017 at 8:49 PM, Craig Ringer <craig@2ndquadrant.com> wrote:
>>
>>
>> Can you get stacks please?
>>
>> Use -g
>
>
> # Events: 2K cpu-clock
> #
> # Overhead Command Shared Object Symbol
> # ........ ........ ................. ............................
> #
> 86.96% postgres [kernel.kallsyms] [k] __mutex_lock_common.isra.5
> |
> --- __mutex_lock_common.isra.5
> read
Unfortunately it looks like you're using a postgres built with
-fomit-frame-pointers (the default) on x64, with an older perf not
built with libunwind. This produces useless stacks.
You may need to recompile with -fno-omit-frame-pointer
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