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runtime: document GOMEMLIMIT in environment variables section

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For #48409.

Change-Id: Ia6616a377bc4c871b7ffba6f5a59792a09b64809
Reviewed-on: https://go-review.googlesource.com/c/go/+/410734
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Chris Hines <chris.cs.guy@gmail.com>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Michael Pratt 2022-06-06 17:20:44 -04:00
parent ef2567c7dd
commit f3e051a184
1 changed files with 13 additions and 2 deletions
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15
src/runtime/extern.go
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@ -18,8 +18,19 @@ The GOGC variable sets the initial garbage collection target percentage.
A collection is triggered when the ratio of freshly allocated data to live data
remaining after the previous collection reaches this percentage. The default
is GOGC=100. Setting GOGC=off disables the garbage collector entirely.
The runtime/debug package's SetGCPercent function allows changing this
percentage at run time. See https://golang.org/pkg/runtime/debug/#SetGCPercent.
[runtime/debug.SetGCPercent] allows changing this percentage at run time.
The GOMEMLIMIT variable sets a soft memory limit for the runtime. This memory limit
includes the Go heap and all other memory managed by the runtime, and excludes
external memory sources such as mappings of the binary itself, memory managed in
other languages, and memory held by the operating system on behalf of the Go
program. GOMEMLIMIT is a numeric value in bytes with an optional unit suffix.
The supported suffixes include B, KiB, MiB, GiB, and TiB. These suffixes
represent quantities of bytes as defined by the IEC 80000-13 standard. That is,
they are based on powers of two: KiB means 2^10 bytes, MiB means 2^20 bytes,
and so on. The default setting is math.MaxInt64, which effectively disables the
memory limit. [runtime/debug.SetMemoryLimit] allows changing this limit at run
time.
The GODEBUG variable controls debugging variables within the runtime.
It is a comma-separated list of name=val pairs setting these named variables: