| commit | 572f08a06449093693fb6d09fc3c2525e5d6afbd | [log] [tgz] |
|---|---|---|
| author | Austin Clements <austin@google.com> | Tue Aug 04 10:45:29 2015 -0400 |
| committer | Austin Clements <austin@google.com> | Mon Sep 14 18:15:40 2015 +0000 |
| tree | 16268a9f2714ea729d324124f16b9c81d1ae6692 | |
| parent | 739f13383791847fd4b0a1eab7e333b5780be039 [diff] |
runtime: split marking of span roots into 128 subtasks Marking of span roots can represent a significant fraction of the time spent in mark termination. Simply traversing the span list takes about 1ms per GB of heap and if there are a large number of finalizers (for example, for network connections), it may take much longer. Improve the situation by splitting the span scan into 128 subtasks that can be executed in parallel and load balanced by the markroots parallel for. This lets the GC balance this job across the Ps. A better solution is to do this during concurrent mark, or to improve it algorithmically, but this is a simple change with a lot of bang for the buck. This was suggested by Rhys Hiltner. Updates #11485. Change-Id: I8b281adf0ba827064e154a1b6cc32d4d8031c03c Reviewed-on: https://go-review.googlesource.com/13112 Reviewed-by: Keith Randall <khr@golang.org>
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