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runtime: less aggressive per-thread stack segment caching

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Introduce global stack segment cache and limit per-thread cache size.
This greatly reduces StackSys memory on workloads that create lots of threads.

benchmark                      old ns/op    new ns/op    delta
BenchmarkStackGrowth                 665          656   -1.35%
BenchmarkStackGrowth-2               333          328   -1.50%
BenchmarkStackGrowth-4               224          172  -23.21%
BenchmarkStackGrowth-8               124           91  -26.13%
BenchmarkStackGrowth-16               82           47  -41.94%
BenchmarkStackGrowth-32               73           40  -44.79%

BenchmarkStackGrowthDeep           97231        94391   -2.92%
BenchmarkStackGrowthDeep-2         47230        58562  +23.99%
BenchmarkStackGrowthDeep-4         24993        49356  +97.48%
BenchmarkStackGrowthDeep-8         15105        30072  +99.09%
BenchmarkStackGrowthDeep-16        10005        15623  +56.15%
BenchmarkStackGrowthDeep-32        12517        13069   +4.41%

TestStackMem#1,MB                  310          12       -96.13%
TestStackMem#2,MB                  296          14       -95.27%
TestStackMem#3,MB                  479          14       -97.08%

TestStackMem#1,sec                 3.22         2.26     -29.81%
TestStackMem#2,sec                 2.43         2.15     -11.52%
TestStackMem#3,sec                 2.50         2.38      -4.80%

R=sougou, no.smile.face, rsc
CC=golang-dev, msolomon
https://golang.org/cl/7029044
This commit is contained in:
Dmitriy Vyukov 2013-01-10 09:57:06 +04:00
parent 7d403871cb
commit f82db7d9e4
6 changed files with 154 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

12
src/pkg/runtime/proc_test.go
View file

@ -53,7 +53,7 @@ func stackGrowthRecursive(i int) {
}
}
func BenchmarkStackGrowth(b *testing.B) {
func benchmarkStackGrowth(b *testing.B, rec int) {
const CallsPerSched = 1000
procs := runtime.GOMAXPROCS(-1)
N := int32(b.N / CallsPerSched)
@ -63,7 +63,7 @@ func BenchmarkStackGrowth(b *testing.B) {
for atomic.AddInt32(&N, -1) >= 0 {
runtime.Gosched()
for g := 0; g < CallsPerSched; g++ {
stackGrowthRecursive(10)
stackGrowthRecursive(rec)
}
}
c <- true
@ -74,6 +74,14 @@ func BenchmarkStackGrowth(b *testing.B) {
}
}
func BenchmarkStackGrowth(b *testing.B) {
benchmarkStackGrowth(b, 10)
}
func BenchmarkStackGrowthDeep(b *testing.B) {
benchmarkStackGrowth(b, 1024)
}
func BenchmarkSyscall(b *testing.B) {
const CallsPerSched = 1000
procs := runtime.GOMAXPROCS(-1)