[Bug 106631] PALM: clpeak: Bus error (core dumped) & lots of GPU lockup

[Bug 106631] PALM: clpeak: Bus error (core dumped) & lots of GPU lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106631

            Bug ID: 106631
           Summary: PALM: clpeak: Bus error (core dumped) & lots of GPU
                    lockup
           Product: Mesa
           Version: 18.0
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: ricardo.ribalda@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

root@qt5022:~# time clpeak 

Platform: Clover
  Device: AMD PALM (DRM 2.50.0 / 4.16.0-qtec-standard, LLVM 6.0.1)
    Driver version  : 18.0.3 (Linux x64)
    Compute units   : 2
    Clock frequency : 0 MHz

    Global memory bandwidth (GBPS)
      float   : 5.42
      float2  : 7.10
      float4  : 6.69
      float8  : 4.88
      float16 : 0.43

    Single-precision compute (GFLOPS)
      float   : 18.90
      float2  : 36.90
      float4  : 38.66
      float8  : 42.19
      float16 : 53.13

    No half precision support! Skipped

    No double precision support! Skipped

    Integer compute (GIOPS)
      int   : 9.48
      int2  : Bus error (core dumped)

real    20m10.785s
user    15m58.717s
sys     1m5.031s

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[Bug 106631] PALM: clpeak: Bus error (core dumped) & lots of GPU lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106631

--- Comment #1 from Ricardo Ribalda <ricardo.ribalda@gmail.com> ---
Created attachment 139710
  --> https://bugs.freedesktop.org/attachment.cgi?id=139710&action=edit
dmesg

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[Bug 106631] PALM: clpeak: Bus error (core dumped) & lots of GPU lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106631

--- Comment #2 from Ricardo Ribalda <ricardo.ribalda@gmail.com> ---
libclc version: a2118d58fca567694edfabea78293e0dc9255500 (current HEAD)

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[Bug 106631] PALM: clpeak: Bus error (core dumped) & lots of GPU lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106631

Jan Vesely <jan.vesely@rutgers.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |99553

--- Comment #3 from Jan Vesely <jan.vesely@rutgers.edu> ---
looks like the benchmark needs more than the allocated 10s to complete. you can
adjust this via radeon.lockup_timeout kernel module parameter.
You can check the used value at:
/sys/module/radeon/parameters/lockup_timeout
but you'll need to set it at boot time.


(In reply to Ricardo Ribalda from comment #0)
> 
> real	20m10.785s
> user	15m58.717s
> sys	1m5.031s

oh, that's pretty slow...


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=99553
[Bug 99553] Tracker bug for runnning OpenCL applications on Clover
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[Bug 106631] PALM: clpeak: Bus error (core dumped) & lots of GPU lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106631

--- Comment #4 from Ricardo Ribalda <ricardo.ribalda@gmail.com> ---
Hi Jan

I have increased lockup_timeout to 100K and I am not getting the bus error. But
I am getting similar dmesg errors

root@qt5022:~# cat /sys/module/radeon/parameters/lockup_timeout
100000

root@qt5022:~# time clpeak

Platform: Clover
  Device: AMD PALM (DRM 2.50.0 / 4.16.0-qtec-standard, LLVM 6.0.1)
    Driver version  : 18.0.3 (Linux x64)
    Compute units   : 2
    Clock frequency : 0 MHz

    Global memory bandwidth (GBPS)
      float   : 5.46
      float2  : 7.17
      float4  : 6.79
      float8  : 4.89
      float16 : 0.11

    Single-precision compute (GFLOPS)
      float   : 18.95
      float2  : 36.90
      float4  : 38.69
      float8  : 42.19
      float16 : 53.17

    No half precision support! Skipped

    No double precision support! Skipped

    Integer compute (GIOPS)
      int   : 9.49
      int2  : 18.52
      int4  : 18.41
      int8  : 18.59
      int16 : 18.05

    Transfer bandwidth (GBPS)
      enqueueWriteBuffer         : 1.21
      enqueueReadBuffer          : 0.63
      enqueueMapBuffer(for read) : 2.30
        memcpy from mapped ptr   : 0.87
      enqueueUnmap(after write)  : 506.05
        memcpy to mapped ptr     : 0.88

    Kernel launch latency : 608.36 us


real    29m45.765s
user    18m55.669s
sys     1m7.651s

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[Bug 106631] PALM: clpeak: Bus error (core dumped) & lots of GPU lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106631

--- Comment #5 from Ricardo Ribalda <ricardo.ribalda@gmail.com> ---
Created attachment 139734
  --> https://bugs.freedesktop.org/attachment.cgi?id=139734&action=edit
dmesg 100k

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[Bug 106631] PALM: clpeak: Bus error (core dumped) & lots of GPU lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106631

--- Comment #6 from Ricardo Ribalda <ricardo.ribalda@gmail.com> ---
Eventhough it is not comparable, for reference: this is the result with fgrlx.

root@qt5022:~# time clpeak 

Platform: AMD Accelerated Parallel Processing
  Device: AMD G-T56N Processor
    Driver version  : 1800.8 (sse2) (Linux x64)
    Compute units   : 2
    Clock frequency : 530 MHz

    Global memory bandwidth (GBPS)
      float   : 0.80
      float2  : 1.12
      float4  : 1.09
      float8  : 1.31
      float16 : 1.34

    Single-precision compute (GFLOPS)
      float   : 0.59
      float2  : 1.16
      float4  : 2.32
      float8  : 4.42
      float16 : 0.85

    No half precision support! Skipped

    Double-precision compute (GFLOPS)
      double   : 0.43
      double2  : 0.84
      double4  : 1.46
      double8  : 1.41
      double16 : 0.28

    Integer compute (GIOPS)
      int   : 0.73
      int2  : 0.30
      int4  : 0.35
      int8  : 0.40
      int16 : 0.32

    Transfer bandwidth (GBPS)
      enqueueWriteBuffer         : 1.29
      enqueueReadBuffer          : 1.08
      enqueueMapBuffer(for read) : 3591.11
        memcpy from mapped ptr   : 0.98
      enqueueUnmap(after write)  : 15339.17
        memcpy to mapped ptr     : 0.99

    Kernel launch latency : 64.41 us


real    8m12.337s
user    12m51.022s
sys     0m29.840s

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[Bug 106631] PALM: clpeak: Bus error (core dumped) & lots of GPU lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106631

--- Comment #7 from Jan Vesely <jan.vesely@rutgers.edu> ---
It looks like even 100s is not enough. Can you try running with no time limit?
(set to 0).
Looking at the numbers I think mesa's results are inflated by the kernel
getting killed before finishing the computation.
Looking at the numbers it can take significantly longer.

Did you by any chance build llvm in debug mode? that can inflate kernel compile
times significantly.

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[Bug 106631] PALM: clpeak: Bus error (core dumped) & lots of GPU lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106631

--- Comment #8 from Ricardo Ribalda <ricardo.ribalda@gmail.com> ---
I am using llvm/clang from https://github.com/kraj/meta-clang . Can you point
me to something to check if the debug mode is enabled or not?

Thanks

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[Bug 106631] PALM: clpeak: Bus error (core dumped) & lots of GPU lockup

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https://bugs.freedesktop.org/show_bug.cgi?id=106631

--- Comment #9 from Ricardo Ribalda <ricardo.ribalda@gmail.com> ---
(In reply to Ricardo Ribalda from comment #8)
> I am using llvm/clang from https://github.com/kraj/meta-clang . Can you
> point me to something to check if the debug mode is enabled or not?
> 
> Thanks

Answer to myself. Seems to be a Release build :
https://github.com/kraj/meta-clang/blob/master/recipes-devtools/clang/clang_git.bb#L78

But if you can tell me how to verify it in runtime I would love to try it

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[Bug 106631] PALM: clpeak: Bus error (core dumped) & lots of GPU lockup

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--- Comment #10 from Jan Vesely <jan.vesely@rutgers.edu> ---
(In reply to Ricardo Ribalda from comment #9)
> (In reply to Ricardo Ribalda from comment #8)
> > I am using llvm/clang from https://github.com/kraj/meta-clang . Can you
> > point me to something to check if the debug mode is enabled or not?
> > 
> > Thanks
> 
> Answer to myself. Seems to be a Release build :
> https://github.com/kraj/meta-clang/blob/master/recipes-devtools/clang/
> clang_git.bb#L78
> 
> But if you can tell me how to verify it in runtime I would love to try it

$ llvm-config --assertion-mode
and
$ llvm-config --build-mode

this won't change the GPU kernel running time, but it might speed up the kernel
compilation time.

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[Bug 106631] PALM: clpeak: Bus error (core dumped) & lots of GPU lockup

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--- Comment #11 from Ricardo Ribalda <ricardo.ribalda@gmail.com> ---
Seems that it is in release mode

root@qt5022:~# llvm-config --assertion-mode
OFF
root@qt5022:~# llvm-config --build-mode    
Release

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[Bug 106631] PALM: clpeak: Bus error (core dumped) & lots of GPU lockup

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GitLab Migration User <gitlab-migration@fdo.invalid> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #12 from GitLab Migration User <gitlab-migration@fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/638.

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