tree 505252aa94b8d6d25d9e80c91ff87d4de014f1ed
parent 81bf84fbeb4af082a64de04d17a09e65eb082013
author Philipp Wollermann <philwo@google.com> 1788904689 +0200
committer gn-scoped@luci-project-accounts.iam.gserviceaccount.com <gn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1789560731 -0700

Header check: batch reachability and file checking tasks

Post reachability precomputation in groups of 32 targets and file
checking in groups of 64 files. This reduces queue operations and
completion counter updates. Collect violations within each group and
merge them under one lock.

Share the task posting and completion wait between both phases.

Chromium `gn gen --check`, medians of five round-robin rounds:
  Mac (M4 Max):    3.07 s -> 3.13 s (within noise)
  GCE c4d-384:     5.80 s -> 5.15 s
  Intel 13900KS:   3.24 s -> 3.30 s (within noise)

CPU time (c4d-standard-384):
  User:  39.6 s -> 38.5 s (-3%)
  Sys:   45.4 s -> 50.2 s (+11%)

Heap stats:
  Allocs (count):  54.24 M -> 54.24 M (0%)
  Heap (total):    24.93 GB -> 24.92 GB (0%)
  Heap (peak):      5.47 GB ->  5.46 GB (0%)

Change-Id: I8b884c5dd5c1bd58a40aaf151073ce9058326501
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/26341
Reviewed-by: Takuto Ikuta <tikuta@google.com>
Reviewed-by: Matt Stark <msta@google.com>
Commit-Queue: Philipp Wollermann <philwo@google.com>