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SergeyKostrov
Valued Contributor II
104 Views

Stress testing of Intel OpenMP library - More than 18,600 OpenMP threads created in a parallel region

Hi everybody,

I'd like to share results of stress testing ofIntel OpenMP library for a 32-bit platform:

libiomp5md.dll

Intel OMP Performance Library
version 5.0.20111219 for IA-32 architecture
built on 2011-12-19 17:12:07 UTC

A purpose of the stress test was as follows:

Create as many as possible OpenMP threads in a parallel region on aone CPU system.

Details:

It isstated by Intel that up to 16,384 OpenMP threads could be created in a parallel region. This is not true,
because a simpletest application easily created more than 18,600 OpenMP threads on a 32-bit Windows XP
operating system ( 4GB of Virtual Memory ).

How would I compare Intel OpenMP library with Microsoft OpenMP library?

Intel's library is far more advancedand demonstrated outstanding capabilities (!).Microsoft's library
doesn't allow to create more than 64 OpenMP threads in a parallel region. Intel's OpenMP library could be used
forsophisticated scientific projects that require a veryhigh level of parallelization.

Fourscreenshootswill beenclosed.

Best regards,
Sergey
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10 Replies
SergeyKostrov
Valued Contributor II
104 Views




SergeyKostrov
Valued Contributor II
104 Views




SergeyKostrov
Valued Contributor II
104 Views

I found a very interesting article regarding limits of Windows platform(s):

http://blogs.technet.com/b/markrussinovich/archive/2009/07/08/3261309.aspx
SergeyKostrov
Valued Contributor II
104 Views

I've done some review and unfortunately a Post #4 is a spam-post. It is not related to the subject of the thread.

Best regards,
Sergey
SergeyKostrov
Valued Contributor II
104 Views

Quoting billywesley
I am little bit comfused in terms of How it actually works? Can you explain it in brief?

I've created a smalltest-case in C++ that uses some OpenMP functionalityand compiled it with Intel C++ compiler.
I could post the source codes if you need and please confirm me.

Best regards,
Sergey
sureshgupta22
Beginner
104 Views

It means that theunion 'my_union_t' can not be splitted in two cache lines. Sorry for a little deviation from the main subject.




SergeyKostrov
Valued Contributor II
104 Views

It means that theunion 'my_union_t' can not be splitted in two cache lines. Sorry for a little deviation from the main subject.

Sorry, but it looks like that statementshould beaddressedto a different thread.
sureshgupta22
Beginner
104 Views

It is not related to the subject of the thread.
Bernard
Black Belt
104 Views

>>>I found a very interesting article regarding limits of Windows platform(s):>>> Thanks very insightful information.
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