Hi,
I have a gc.go:
package main
import (
"fmt"
"runtime/debug"
)
const N = 3e8
func f(x int) {
ls := make([]uint64, N)
for i := N - 1; i >= 0; i-- {
ls[i] = uint64(i)
}
fmt.Println(ls[x])
}
func main() {
debug.SetGCPercent(10)
f(8)
f(9)
}
1st call suscessfully returns, I have enough ram on my laptop, but the 2nd
call fails with "fatal error: runtime: out of memory"
The output is in gc.txt. So what's happening ?
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8
fatal error: runtime: out of memory
runtime stack:
runtime.throw(0x4a726c, 0x16)
/Program/go/src/runtime/panic.go:596 +0x95
runtime.sysMap(0xc4af1e0000, 0x8f0e0000, 0x0, 0x515a98)
/Program/go/src/runtime/mem_linux.go:216 +0x1d0
runtime.(*mheap).sysAlloc(0x4fd9c0, 0x8f0e0000, 0x27)
/Program/go/src/runtime/malloc.go:428 +0x374
runtime.(*mheap).grow(0x4fd9c0, 0x47869, 0x0)
/Program/go/src/runtime/mheap.go:774 +0x62
runtime.(*mheap).allocSpanLocked(0x4fd9c0, 0x47869, 0x1)
/Program/go/src/runtime/mheap.go:678 +0x44f
runtime.(*mheap).alloc_m(0x4fd9c0, 0x47869, 0x100000000, 0xffffffffffffffff)
/Program/go/src/runtime/mheap.go:562 +0xe2
runtime.(*mheap).alloc.func1()
/Program/go/src/runtime/mheap.go:627 +0x4b
runtime.systemstack(0x7ffc67c18f20)
/Program/go/src/runtime/asm_amd64.s:343 +0xab
runtime.(*mheap).alloc(0x4fd9c0, 0x47869, 0x10100000000, 0x42e8c1)
/Program/go/src/runtime/mheap.go:628 +0xa0
runtime.largeAlloc(0x8f0d1800, 0xc42001c001, 0xc4200001a0)
/Program/go/src/runtime/malloc.go:795 +0x93
runtime.mallocgc.func1()
/Program/go/src/runtime/malloc.go:690 +0x3e
runtime.systemstack(0x4fab00)
/Program/go/src/runtime/asm_amd64.s:327 +0x79
runtime.mstart()
/Program/go/src/runtime/proc.go:1132
goroutine 1 [running]:
runtime.systemstack_switch()
/Program/go/src/runtime/asm_amd64.s:281 fp=0xc420028628 sp=0xc420028620
runtime.mallocgc(0x8f0d1800, 0x489da0, 0xc420028701, 0x1)
/Program/go/src/runtime/malloc.go:691 +0x930 fp=0xc4200286c8
sp=0xc420028628
runtime.makeslice(0x489da0, 0x11e1a300, 0x11e1a300, 0x2, 0x0, 0x0)
/Program/go/src/runtime/slice.go:54 +0x7b fp=0xc420028718
sp=0xc4200286c8
main.f(0x9)
/Dev/go/src/tools/gc.go:11 +0x43 fp=0xc420028768 sp=0xc420028718
main.main()
/Dev/go/src/tools/gc.go:21 +0x44 fp=0xc420028788 sp=0xc420028768
runtime.main()
/Program/go/src/runtime/proc.go:185 +0x20a fp=0xc4200287e0
sp=0xc420028788
runtime.goexit()
/Program/go/src/runtime/asm_amd64.s:2197 +0x1 fp=0xc4200287e8
sp=0xc4200287e0
exit status 2
