| commit | ae43043f6c42add7bd0535b66edb344bbc6e9001 | [log] [tgz] |
|---|---|---|
| author | Laszlo Csomor <laszlocsomor@google.com> | Tue Jul 17 04:18:30 2018 -0700 |
| committer | Copybara-Service <copybara-piper@google.com> | Tue Jul 17 04:20:23 2018 -0700 |
| tree | 29a52a443382e9222538205751ff58fa0673ad07 | |
| parent | 8231cd72a4224823653b76a167e0107f6da9719d [diff] |
Windows,Bazel client: multithreaded file writing The Bazel client on Windows now writes extracted binaries to disk in parallel. On all other systems it writes them serially (as before). This change makes blaze.cc:ActuallyExtractData() about 3x faster when using a HDD. (In previous experiments I saw no speedup with multi-threaded writing on machines with an SSD.) The Windows-specific code uses the native Threadpool API of Windows, creating a pool of at least 8 and at most 16 threads. (This seems to be a good balance between speed and thread count.) The OS manages everything about the pool; Bazel submits callbacks and the pool executes them asynchronously. blaze.cc:ActuallyExtractData() speed, before: - Windows: 6.48s (avg) / 6.38s (median) - Linux (Debian): 4.78s (avg) / 4.79s (median) blaze.cc:ActuallyExtractData() speed, after: - Windows (8-16 threads): 2.05s (avg) / 2.01s (md) - Windows (1 thread): 5.77s (avg) / 5.74s (median) See https://github.com/bazelbuild/bazel/issues/5444 Change-Id: I7211f3d28eb8b9837352c16ff8df0411d5a9ebe1 Closes #5600. Change-Id: I7a74d62a563c92948a4dfa8ad5ac83eae018db10 PiperOrigin-RevId: 204891217
{Fast, Correct} - Choose two
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