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| author | Michael Anthony Knyszek <mknyszek@google.com> | 2023-06-16 18:28:22 +0000 |
|---|---|---|
| committer | Michael Knyszek <mknyszek@google.com> | 2023-06-21 15:57:28 +0000 |
| commit | e45202f2154839f713b603fd6e5f8a8ad8d527e0 (patch) | |
| tree | 9da85d2de7675f54ff60568de8811aad6b57f3e4 | |
| parent | 36edde9d9f811477e1d5bd0090f4a061ba823db9 (diff) | |
| download | go-e45202f2154839f713b603fd6e5f8a8ad8d527e0.tar.gz go-e45202f2154839f713b603fd6e5f8a8ad8d527e0.zip | |
runtime: relate GODEBUG=gctrace output to runtime/metrics
There's more I could list here, but the mapping becomes more complicated
and more fragile. I think this is sufficient to start with.
Fixes #46846.
Change-Id: I6803486a64888b2f38e244b8e2175ad064d648ed
Reviewed-on: https://go-review.googlesource.com/c/go/+/504115
Reviewed-by: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
| -rw-r--r-- | src/runtime/extern.go | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/src/runtime/extern.go b/src/runtime/extern.go index ac07119cb9..26dcf0bd52 100644 --- a/src/runtime/extern.go +++ b/src/runtime/extern.go @@ -87,7 +87,8 @@ It is a comma-separated list of name=val pairs setting these named variables: gctrace: setting gctrace=1 causes the garbage collector to emit a single line to standard error at each collection, summarizing the amount of memory collected and the - length of the pause. The format of this line is subject to change. + length of the pause. The format of this line is subject to change. Included in + the explanation below is also the relevant runtime/metrics metric for each field. Currently, it is: gc # @#s #%: #+#+# ms clock, #+#/#/#+# ms cpu, #->#-># MB, # MB goal, # MB stacks, #MB globals, # P where the fields are as follows: @@ -95,11 +96,11 @@ It is a comma-separated list of name=val pairs setting these named variables: @#s time in seconds since program start #% percentage of time spent in GC since program start #+...+# wall-clock/CPU times for the phases of the GC - #->#-># MB heap size at GC start, at GC end, and live heap - # MB goal goal heap size - # MB stacks estimated scannable stack size - # MB globals scannable global size - # P number of processors used + #->#-># MB heap size at GC start, at GC end, and live heap, or /gc/scan/heap:bytes + # MB goal goal heap size, or /gc/heap/goal:bytes + # MB stacks estimated scannable stack size, or /gc/scan/stack:bytes + # MB globals scannable global size, or /gc/scan/globals:bytes + # P number of processors used, or /sched/gomaxprocs:threads The phases are stop-the-world (STW) sweep termination, concurrent mark and scan, and STW mark termination. The CPU times for mark/scan are broken down in to assist time (GC performed in |