From: Michael Anthony Knyszek <mknyszek@google.com>
Date: Tue, 14 Nov 2023 15:36:39 +0000 (+0000)
Subject: internal/trace/v2: halve the memory footprint of the gc-stress test
X-Git-Tag: go1.22rc1~331
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=859c13a5ad80308125c79521cfc047200fd5a512;p=gostls13.git

internal/trace/v2: halve the memory footprint of the gc-stress test

An out-of-memory error in this test has been observed on 32-bit
platforms, so halve the memory footprint of the test. Also halve the
size of steady-state allocation rate in bytes. The end result should be
approximately the same GC CPU load but at half the memory usage.

Change-Id: I2c2d335da7dc4c5c58cb9d92b6e5a4ece55d24a8
Reviewed-on: https://go-review.googlesource.com/c/go/+/542215
Auto-Submit: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
---

diff --git a/src/internal/trace/v2/testdata/testprog/gc-stress.go b/src/internal/trace/v2/testdata/testprog/gc-stress.go
index 7a1fdfdfe1..70d3a246c3 100644
--- a/src/internal/trace/v2/testdata/testprog/gc-stress.go
+++ b/src/internal/trace/v2/testdata/testprog/gc-stress.go
@@ -37,15 +37,15 @@ func makeTree(depth int) *node {
 	}
 }
 
-var trees [32]*node
-var ballast *[32]*[8192]*node
+var trees [16]*node
+var ballast *[16]*[8192]*node
 var sink []byte
 
 func main() {
 	for i := range trees {
 		trees[i] = makeTree(6)
 	}
-	ballast = new([32]*[8192]*node)
+	ballast = new([16]*[8192]*node)
 	for i := range ballast {
 		ballast[i] = new([8192]*node)
 		for j := range ballast[i] {
@@ -57,7 +57,7 @@ func main() {
 	for i := 0; i < runtime.GOMAXPROCS(-1); i++ {
 		go func() {
 			for {
-				sink = make([]byte, rand.Intn(65536))
+				sink = make([]byte, rand.Intn(32<<10))
 			}
 		}()
 	}