[Beignet] thread safety and OpenMP

[Gerald Baier]

On 07/01/2015 07:28 AM, He, Junyan wrote:
> So far as we know, beignet is thread safe.
> Every thead has its own command buffer and do not have
> relationship with each others.
> Do you use subbuffer to divide the image?
No, as far as I can tell I don't use anything special or advanced.
> If you can provide some source code or test case, it may
> help a lot.
I'll try to hack together a minimal example over the weekend.

Thanks already for your feedback. Cheers.
>   
>
>
> -----Original Message-----
> From: Song, Ruiling
> Sent: Wednesday, July 01, 2015 10:40 AM
> To: Gerald Baier; beignet at lists.freedesktop.org
> Cc: He, Junyan
> Subject: RE: [Beignet] thread safety and OpenMP
>
>
>
>> -----Original Message-----
>> From: Beignet [mailto:beignet-bounces at lists.freedesktop.org] On Behalf Of
>> Gerald Baier
>> Sent: Sunday, June 28, 2015 9:56 PM
>> To: beignet at lists.freedesktop.org
>> Subject: [Beignet] thread safety and OpenMP
>>
>> I'm using Beignet for image processing, where basically the image is
>> subdivided into tiles which are then processed by several threads using
>> OpenMP tasks. I noticed that some of the tiles are occasionally messed up. If
>
> Using OpenMP or OpenCL?
> Per OpenCL spec, opencl driver should be thread-safe, and Junyan implemented the multi-thread support in beignet. That is to say Beignet is thread-safe.
> I am not sure whether Junyan has more comments on how to debug the issue. By the way, if you can provide a test case to reproduce the issue, it would be much helpful.
>
> Thanks!
> Ruiling
>> I use only one thread everything works fine, also the same program runs as
>> expected on nvidia GPUs with multiple threads. Hence the question whether
>> Beignet is thread safe and how I could debug my program?
>>
>> Here's my configuration:
>> device name: Intel(R) HD Graphics IvyBridge M GT2 device version: OpenCL
>> 1.2 beignet 1.0.3 (git-9e0ca6f)
>>
>> Best regards,
>> Gerald
>>
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