[Bug 91857] New: Mesa 10.6.3 linker is slow

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91857

            Bug ID: 91857
           Summary: Mesa 10.6.3 linker is slow
           Product: DRI
           Version: unspecified
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: CliveMcCarthy at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

The Mesa linker is dreadfully slow. Compilation of my GLSL source on an
i3-4010U takes just 63.9ms. The linker takes 88.2 seconds, yes, seconds.

An apples and oranges comparison: an Nvidia driver on an i7 platform, with the
same GLSL code, compiles in 31.1ms and links in 12.5ms.

Proportionately, this makes the Mesa linker 3,400 times slower than the Nvidia
linker, apples-to-apples. My guess is that some linkage look-up has bad
behaviour as the symbol table size grows.

The good news is that the shader runs just fine.

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