Re: st: number of processes/threads open and used under StataMP

[László Sándor <sandorl@gmail.com>]

For the record: system settings limited Stata from utilizing all the
cores it was licensed to use. IT fixed the problem for me since, but
never noticed.

There might be a deeper lesson here: Maybe advanced users want to
check up on this every once in a while.

Or even Stata could have a warning about this on startup, esp. if it
can verify the number of cores on the system being larger than how
many processes/threads the OS allows to open (and the license would
apply for more).

On Fri, Sep 13, 2013 at 3:18 AM, Maarten Buis <maartenlbuis@gmail.com> wrote:
> This is more question for Stata's techsupport.
>
> -- Maarten
>
> On Thu, Sep 12, 2013 at 7:30 PM, László Sándor <sandorl@gmail.com> wrote:
>> I would also like to understand StataMP 13 threading. I am running
>> StataMP 13 batches on a Windows server where I have no access to job
>> scheduling. I can only submit a job and see it slowly progressing.
>>
>> Now I checked the details of the jobs, and usually I see six threads
>> open for any of my jobs, but only 4 having used the CPU at all. (The
>> monitoring tool does keep a running account of CPU usage.)
>>
>> The Stata license is for 8 cores.
>>
>> I think I have three related questions:
>>
>> 1. For my information: is it normal that Stata open more threads than
>> it uses (which depends on the operations, obviously). If so, why not
>> open all 8?
>>
>> 2. More operationally: Do the two open threads slow Stata down because
>> it hopes to access them but never gets scheduled on our server? Am I
>> better off with ramping -set processor- down to 4?
>>
>> 3. Related to both previous points: Shall I contact our IT staff that
>> maybe the scheduling setup holds me back because I could benefit from
>> the use of 8 cores and it is unlikely that Stata would never opened
>> them if it were allowed? (In case it matters, my operations involved
>> -sum-, -replace- and third-party Mata code.)
>>
>> Thanks,
>>
>> Laszlo
>> *
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>
>
>
> --
> ---------------------------------
> Maarten L. Buis
> WZB
> Reichpietschufer 50
> 10785 Berlin
> Germany
>
> http://www.maartenbuis.nl
> ---------------------------------
>
> *
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*
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*   http://www.ats.ucla.edu/stat/stata/