[Beignet] Beignet not working on Dell Precision M3800

Wed Jun 4 04:29:59 PDT 2014

On Tue, Jun 3, 2014 at 11:15 PM, Yang, Rong R <rong.r.yang at intel.com> wrote:
> Printf is not a built in function OpenCL 1.1, so beignet don't support it now. However, beignet are supporting it, maybe you could use it soon.
>

However, even if the function is not defined, shouldn't the compiler
return a error (opencl error) rather than raising a exception and
abort?

> Yes, the patch about 3D pipe have not push now, but You can apply by manual and try it.

I'm afraid I don't have time to test it soon...

>
> -----Original Message-----
> From: Yichao Yu [mailto:yyc1992 at gmail.com]
> Sent: Thursday, May 29, 2014 8:40 PM
> To: Yang, Rong R
> Cc: beignet at lists.freedesktop.org
> Subject: Re: [Beignet] Beignet not working on Dell Precision M3800
>
> On Thu, May 29, 2014 at 4:46 AM, Yang, Rong R <rong.r.yang at intel.com> wrote:
>> I have checked this issue, it is a beignet compiler bug, should be fix by patch "GBE: Change 64bit integer storage in register".
>>
>> For the first problem, I have sent some patch, can you try them? The patch " HSW: Restore L3 control register to disable SLM mode." fix a 3D pipe affect by Beignet bug. May be the same problem you met.
>
> I am testing using the current master
>
> c34eba71bd5a518906d6d5d3ba26e44327cab251
> GBE: fix one illegal instruction when replace a uniform dst.
>
> So the patch u mentioned for 3D pipe doesn't seem to be included yet.
>
> Here are what I saw,
> 1, `printf("%d\n", i);` works on pocl but still crashes the compiler on beignet with the same error.
> 2, the c example I gave works but the original python version does not... Will figure out the difference once I get more time.
> 3, the interference with opengl seems to be different. The same effect I mentioned last time shows up when sth is running on the GPU but recovers afterward. However, it now gives your email a funny texture by replacing some of the characters with another one...[1] (o in this
> case...) I also remember seeing this problem randomly sometime before but it was not as reproducible...
>
> I guess I will test again once those 3d pipe fixing patches are applied.
>
> [1] http://wstaw.org/m/2014/05/29/plasma-desktopzSP722.png
>
> Yichao Yu
>
>> -----Original Message-----
>> From: Yichao Yu [mailto:yyc1992 at gmail.com]
>> Sent: Wednesday, May 28, 2014 11:49 PM
>> To: Yang, Rong R
>> Cc: beignet at lists.freedesktop.org
>> Subject: Re: [Beignet] Beignet not working on Dell Precision M3800
>>
>> On Wed, May 28, 2014 at 11:45 AM, Yichao Yu <yyc1992 at gmail.com> wrote:
>>> On Wed, May 28, 2014 at 10:39 AM, Yichao Yu <yyc1992 at gmail.com> wrote:
>>>>> The second problem is that there seems to be sth wrong if I run two
>>>>> tests in series. More specifically, `test_elwise_kernel`[3],
>>>>> `test_elwise_kernel_with_option`[4] and
>>>>> `test_ranged_elwise_kernel`[5] can all pass if I run them
>>>>> individually. However, if I run them together, only the first one
>>>>> can pass... I will try to reproduce this in C...
>>>>
>>>> Sorry this is NOT what happened... I was not using the right
>>>> parameter to select the tests and there isn't any (at least no
>>>> evidence for it) interference between kernels.
>>>> The problem is rather the test_elsize_kernel_with_option and
>>>> test_ranged_elwise_kernel are not working..
>>>> Also the failing one sometimes (~2 times in 8) hang the wm for ~10s...
>>>> will try to make a c version....
>>>>
>>>
>>> And it seems that none of them is actually working, just that when
>>> the difference is calculated using OpenCL, it always returns 0...
>>>
>>> so here[1] is the c version. The problem seems to be related to the
>>> use of get_local_size and/or get_group_id in the kernel. When I was
>>> using a simple kernel with `int i = get_global_id(0);`, everything
>>> works fine.
>>
>> I haven't applied the patch for using local memory in the kernel. Does that patch affect not only local memory but also local size somehow?
>>
>>>
>>> [1] https://gist.github.com/yuyichao/242fd2a812088930af91
>>>
>>> P.S. I was trying to use printf in the kernel and it seems to crash
>>> the compiler..... Not sure if I was using it correctly but I guess it
>>> shouldn't crash in any case...
>>>
>>> here is the error:
>>> ```
>>> ASSERTION FAILED: it != instrinsicMap.map.end()   at file
>>> /home/yuyichao/projects/mlinux/pkg/all/beignet-git/src/beignet/backen
>>> d /src/llvm/llvm_gen_backend.cpp, function void
>>> gbe::GenWriter::regAllocateCallInst(llvm::CallInst&),
>>> line 2115 [1]    28951 trace trap (core dumped)  ./beignet-bug
>>> ```
>>>
>>> with the following kernel (not sure if it is valid haven't use printf
>>> before....),
>>>
>>> ```
>>> __kernel void fill_one(__global float *out, long n) {
>>>     int i = get_global_id(0);
>>>     printf("%d\n", i);
>>>     if (i < n) {
>>>         out[i] = 1;
>>>     }
>>> }
>>> ```
>>> (this kernel (without printf) works btw....)
>>>
>>> Yichao Yu
>>>
>>>>>
>>>>> [1] http://wstaw.org/m/2014/05/28/plasma-desktopObn722.png
>>>>> [2] http://wstaw.org/m/2014/05/28/plasma-desktopWbB722.png
>>>>> [3]
>>>>> https://github.com/pyopencl/pyopencl/blob/master/test/test_algorith
>>>>> m
>>>>> .py#L45 [4]
>>>>> https://github.com/pyopencl/pyopencl/blob/master/test/test_algorith
>>>>> m
>>>>> .py#L66 [5]
>>>>> https://github.com/pyopencl/pyopencl/blob/master/test/test_algorith
>>>>> m
>>>>> .py#L97
>>>>>>
>>>>>
>>>>> Yours,
>>>>> Yichao Yu
>>>>>
>>>>>>
>>>>>>>>>>>Thanks for point out it, I have sent a patch to correct it.
>>>>>>
>>>>>
>>>>> Seems fixed. THX. =)