DM: run child tasks that are already on the CPU threadpool serially
These tasks tend to do similar things with similar sized bitmaps, so running
them serially means we tend to hold 2x bitmaps at a time (golden and
comparison) instead of (1+k)x bitmaps (golden and k concurrent comparisons).
We still migrate GPU task's children over to the main CPU thread pool,
because they'll run faster there and free up capacity on the GPU thread.
Before
Debug: 54s, 2.9G peak
Release: 13s, 2.4G peak
After
Debug: 48s, 1.5G peak
Release: 15s, 2.0G peak
BUG=skia:2478
R=borenet@google.com, mtklein@google.com
Author: mtklein@chromium.org
Review URL: https://codereview.chromium.org/261593008
git-svn-id: http://skia.googlecode.com/svn/trunk@14486 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed