Created attachment 106510 [details]
For example, the attached shader-runner test took 25 minutes on my IVB laptop. On a debug build of Mesa (with -O1), Sysprof says that ~90% of the time is spent in brw::vec4_live_variables::compute_live_variables().
Changing the test to do
pass = !(condition) && pass;
pass = false;
appears to end the slaughter.
Created attachment 106512 [details]
Faster version of the same test
This version only takes ~30 seconds on the same system. Looking at sysprof data, it appears that ~80% of that is spent in shader_runner parsing the test file. :)
I've tried again with a more recent version (13.1.0-devel (git-9f150ff)), in a IVB desktop.
Seems now it is quite better: shader-runner now takes ~40 seconds.
perf is reporting 45.96% of the time is spent in _mesa_program_resource_find_index.
Giving the improvement, dunno if this should be considered as RESOLVED.
(In reply to Juan A. Suarez from comment #2)
> I've tried again with a more recent version (13.1.0-devel (git-9f150ff)), in
> a IVB desktop.
I've tested with the first shader, not with the faster one.
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