yade-dev team mailing list archive

[Anton Gladky <gladky.anton@xxxxxxxxx>]

Hi, luc,

If you start yade without -j option, it will use just 1 thread. As
Klaus already said, you can start yade with -j6 to start yade in 6
threads.

But you should be careful. If you do not use a large number of
particles, more threads can lead you to decreasing of calculation
speed. That is why yade starts now by default in 1 thread mode not to
confuse new users.

Anton




On Tue, Apr 19, 2011 at 4:39 AM, luc scholtes <lscholtes63@xxxxxxxxx> wrote:
> Hi guys,
>
> sorry to wake up so late, but, I tried to find info concerning the -j/
> --jobs option and could not really sort it all due to my lack of Linux
> oriented knowledge... As I understand, YADE now run 1 thread (job?) per
> core. Nonetheless, what would be the command to make it run 1 thread over
> several/all cores in order to speed up the calculation (if it is the right
> thing to do for this purpose)?
>
> Thanks in advance
>
>   Luc
>
> 2011/1/30 Anton Gladky <gladky.anton@xxxxxxxxx>
>>
>> Hi,
>>
>> In most of my simulations I use 1 thread/core and find it the most
>> optimal solution. Also it helps to get completely identical results
>> excluding openmp-instability. And only on a very large simulations
>> (>10^5 particles) it is reasonable to use 2-3 threads, no more.
>>
>> So, I personally agree.
>>
>> Anton
>>
>>
>>
>>
>> 2011/1/29 Václav Šmilauer <eu@xxxxxxxx>:
>> > Hi there,
>> >
>> > due to numerous performance problems when Yade uses the default number
>> > of
>> > threads (one thread per core), I think it would be better to make run
>> > single-threaded by default, so that unknowledgeable people are not hit.
>> > Those who know assign the right number of threads anyway.
>> >
>> > It would concern both the main program, and also the batch system, which
>> > would still use all cores, but 1 core/job.
>> >
>> > Thoughts?
>> >
>> > v.
>> >
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>