tree 4ee8ae3396dae5b5295de33add842015aaa0eb77
parent 96552d2524a4e8c908ca6a6a5e9f60e90e3d0b42
author Alexander Markov <alexmarkov@google.com> 1607710779 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1607710779 +0000

[vm] Add buffering of --trace_precompiler_to output in memory

Under certain circumstances we see that gen_snapshot spends significant
portion of time in kernel. This happens with --trace_precompiler_to
option specified on the command line.

This change reduces number of I/O operations required to write
--trace_precompiler_to output by adding a memory buffer for the whole
output.

TEST=pkg/vm_snapshot_analysis/test/precompiler_trace_test.dart

Change-Id: I7c2b3fbf1f6b6bee950c2d23809e68e4698f84f4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/175780
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>