How to prevent /proc/<pid>/status from running slow on AIX ?

[Volker Simonis]

Yes, reading /proc/<pid>/status twice in a row will report exactly the
same (inaccurate) value.

It really seems that the update interval of /proc/<pid>/status on AIX
is much to coarse compared to other Unix implementations.

Regards,
Volker

On Thu, Jul 16, 2015 at 10:27 PM, Dean Long <dean.long at oracle.com> wrote:
> If you read /proc/<pid>/status twice in a row, does the value increase or
> stay the same?  I found the following that implies it's not being updated
> between reads:
>
>   http://fixunix.com/aix/85091-reading-proc-status-file.html
>
> If that's the case then the accuracy would be limited by how often an
> internal snapshot is done for procfs.
> Being off by a clock tick sounds reasonable, but being off by 1 second? not
> so reasonable.
>
> dl
>
>
> On 7/15/2015 7:23 AM, Volker Simonis wrote:
>>
>> Hi AIX experts,
>>
>> do you have any idea how to prevent /proc/<pid>/status from running
>> slow on AIX (compared to times() and getrusage())?
>>
>> Please have a look at the attached program which describes and
>> demonstrates the problem in full detail.
>>
>> I'd need a workaround for this problem for the AIX port of the new
>> ProcessHandle implementation which came as part of JEP 102.
>>
>> Thank you and best regards,
>> Volker
>
>