[Piglit] Render-to-FBO and concurrent shader_runner.

Eric Anholt eric at anholt.net
Tue Aug 23 11:32:04 PDT 2011

On Mon, 15 Aug 2011 12:49:19 -0700, Eric Anholt <eric at anholt.net> wrote:
> With all the new tests we're adding, I was feeling guilty about our
> piglit runtime.  I figured that we could run tests into FBOs and avoid
> a bunch of overhead in talking to the X Server and window manager
> about window setup.  That doesn't appear to have been a limiting
> factor (didn't do stats, but didn't look like a statistically
> significant difference after converting), but I think it's worth it
> anyway for not popping up stupid windows as much.  And, now that we're
> rendering offscreen, I feel like running things in parallel even if we
> use the GPU is worth it -- our test runtime is CPU limited, not GPU,
> and anything we can do to make testing easier should help driver
> quality.
> This patch series reduced runtime from 11 minutes 47 seconds in the
> before run to 6:38 in the after run on my dual-core system.
> For those of us working on temporarily unstable drivers that impact
> other tests when run in parallel, we should be able to just use -c
> off.  And, as Ken noted, it's not like the X Server isn't running the
> GPU in parallel with our GL drawing already anyway.

If nobody complains about this in the next couple of days, I'm pushing.
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