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Wrong results: 12.5 vs 12.6
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PaulPa



Joined: 02 Aug 2012
Posts: 35

PostPosted: Thu Aug 02, 2012 5:27 am    Post subject: Wrong results: 12.5 vs 12.6 Reply with quote

Hello,

I am currently working with the pgi compiler 12.6 and I run into some unexpected problems.

While working with 12.5 all the results are correct but if I choose to compile the exact same source code with the pgi 12.6 compiler (no warnings!) the runtime as well as the reults differ (wrong results and totally different runtime).

I realized that the 12.6 compiler chooses to distribute the work in a different way. However, the results should still be correct, right?

Have you encountered similar problems? What could be the reason for this behaviour?

Best,
Paul
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Alexey A. Romanenko



Joined: 17 Feb 2012
Posts: 36

PostPosted: Thu Aug 02, 2012 6:18 am    Post subject: Reply with quote

Hi PaulPa,

at first you could try to verify GPU code compiler produce
Code:
-ta=nvidia,keepgpu


In case compiler really produce incorrect code, fill bug report and send it to PGI team. Hope they suggest you different workarounds for now. Or you can try your own.

Alexey
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mkcolg



Joined: 30 Jun 2004
Posts: 6208
Location: The Portland Group Inc.

PostPosted: Thu Aug 02, 2012 9:48 am    Post subject: Reply with quote

Hi Paul,

It could be a bug in either the compiler or your code. Can you please post an example?

Thanks,
Mat
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Alexey A. Romanenko



Joined: 17 Feb 2012
Posts: 36

PostPosted: Thu Aug 02, 2012 11:00 pm    Post subject: Reply with quote

Thanks Mat!

Are you going to implement it in the next release?

P.S. what about http://www.pgroup.com/userforum//viewtopic.php?t=3349

Alexey
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mkcolg



Joined: 30 Jun 2004
Posts: 6208
Location: The Portland Group Inc.

PostPosted: Fri Aug 03, 2012 2:06 pm    Post subject: Reply with quote

Quote:
Are you going to implement it in the next release?
I think they are looking towards the 12.9/12.10 time frame. We're trying to get back on schedule with a 12.8 release next week and I don't think they'll have this done in time.

- Mat
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