Nouveau - Jul 2012 - [Bug 51862] New: Shader optimizer is extremely slow

https://bugs.freedesktop.org/show_bug.cgi?id=51862

             Bug #: 51862
           Summary: Shader optimizer is extremely slow
    Classification: Unclassified
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Drivers/DRI/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: tiziano at tizbac.dyndns.org


Created attachment 63969
  --> https://bugs.freedesktop.org/attachment.cgi?id=63969
Comparison of shader compile times between mesa and nvidia driver

Shader optimizer is extremely slow and causes games like Crysis that loads
content while playing to go very slow or freeze temporarily

On nvidia proprietary driver sometimes compiling is even 200x faster

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https://bugs.freedesktop.org/show_bug.cgi?id=51862

--- Comment #1 from Tiziano Bacocco <tiziano at tizbac.dyndns.org>
2012-07-08 05:05:09 PDT ---
Created attachment 63970
  --> https://bugs.freedesktop.org/attachment.cgi?id=63970
Profiler output while running a programm that continously compiles shaders

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https://bugs.freedesktop.org/show_bug.cgi?id=51862

Ilia Mirkin <imirkin at alum.mit.edu> changed:

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

--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Looks like most of the time is being spent in ir_expression/etc -- these are
generic mesa glsl facilities. Please retest this with the latest mesa, I
suspect that improvements have been made. If you still think it's slow, feel
free to file a bug with the core mesa team. I don't see anything
nouveau-specific about this issue. Also, please use perf for the measurements,
it can see inside the kernel, which may relevant (that 16% chunk inside the
kernel seems high).

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