Hi Julien,
Did you try:
export ITK_GLOBAL_DEFAULT_NUMBER_OF_THREADS=8
This is documented in
https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb/blob/develop/Documentation/Cookbook/rst/AdvancedUse.rst
along with other environment variables that affect OTB.
Victor Poughon
De : otb-users@googlegroups.com De la part de
Julien Radoux
Envoyé : jeudi 13 septembre 2018 11:09
À : otb-users
Objet : [otb-users] using all cores with multithreaded filters
We have a few custom filters that use ThreadedGenerate data. We didn't realize
immediately, but it seems that the parallel computing is not working properly
with our new configuration :
openSuse 15.0, OTB 6.7 (git), gcc 7.3.1
When we launch a filter with ThreadedGenerateData, the number of thread is
well equal to the number of core (8 threads for 8 cores in my case), but it
only uses 1. This is not the case when we use otbcli_applications.
Diagnostic:
$ taskset -p $(pgrep LWSmoothing)
pid 29938's current affinity mask: 1
$ htop # => process total: 100%, 8 sub-processes: 12%
If we specify before, it does not change anything
$ taskset ff /usr/local/lifewatch/tools/LWSmoothing ...
$ taskset -p $(pgrep LWSmoothing)
pid 30241's current affinity list: 0
If it specify after, it works as expected (800%)
$ taskset -p ff $(pgrep LWSmoothing)
pid 30312's current affinity mask: 1
pid 30312's new affinity mask: ff
$ htop # => ok, 800%
Does anyone have an idea about the reason for this difference ? Is there
something to change in the cxx, the txx or in the compiler's configuration ?
Thanks,
Julien
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