这是一个创建于 2170 天前的主题，其中的信息可能已经有所发展或是发生改变。
import (
"fmt"
"runtime"
"strconv"
"time"
)
func do() {
max := 2100000
item := 11511
var a []int
for range make([]struct{}, max) {
a = append(a, item)
}
var sitem []string
for range make([]struct{}, max) {
sitem = append(sitem, strconv.Itoa(item))
}
fmt.Println(len(sitem))
runtime.GC()
}
func main() {
for range make([]struct{}, 10) {
go do()
}
time.Sleep(time.Hour)
}``` 我个逻辑线上的代码简化版,占用内存 1.1G...怎么会这样, 是没有被 GC 掉吗?
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1
xujiaja 2018-12-06 18:58:13 +08:00
如果想要立即释放，可以调用 runtime/debug 里的 FreeOSMemory()
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3
Licsber 2018-12-06 21:12:56 +08:00
试了一下, 占用内存从 1000M 在 5 秒左右掉到了 744M 10 秒左右 434M 15 秒左右 239M 20 秒就只有 99M 了 最后稳定在 3M 内存占用 没发现 gc 失败啊.. go 最新版本 1.11.2 goland 也是最新版本 2018.3
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5
petelin OP @Licsber 我在 mac 上测试的, 好像是因为 thread 没有退出.
Sampling process 19768 for 3 seconds with 1 millisecond of run time between samples Sampling completed, processing symbols... Analysis of sampling ___go_build_add_go (pid 19768) every 1 millisecond Process: ___go_build_add_go [19768] Path: /private/var/folders/wd/vt73dmmj5y38hft8kg5l1wgm0000gq/T/___go_build_add_go Load Address: 0x1000000 Identifier: ___go_build_add_go Version: ??? Code Type: X86-64 Parent Process: goland [14064] Date/Time: 2018-12-06 21:33:47.174 +0800 Launch Time: 2018-12-06 21:33:00.224 +0800 OS Version: Mac OS X 10.13.6 (17G3025) Report Version: 7 Analysis Tool: /usr/bin/sample Physical footprint: 1.2G Physical footprint (peak): 1.2G ---- Call graph: 2580 Thread_15197711 DispatchQueue_1: com.apple.main-thread (serial) + 2580 runtime.asmcgocall (in ___go_build_add_go) + 112 [0x1050da0] + 2580 runtime.pthread_cond_timedwait_relative_np_trampoline (in ___go_build_add_go) + 20 [0x1053204] + 2580 _pthread_cond_wait (in libsystem_pthread.dylib) + 789 [0x7fff5779a5c2] + 2580 __psynch_cvwait (in libsystem_kernel.dylib) + 10 [0x7fff575d1a16] 2580 Thread_15197713 + 2580 thread_start (in libsystem_pthread.dylib) + 13 [0x7fff57798bf9] + 2580 _pthread_start (in libsystem_pthread.dylib) + 377 [0x7fff5779950d] + 2580 runtime.mstart_stub (in ___go_build_add_go) + 46 [0x10530ce] + 2580 runtime.mstart (in ___go_build_add_go) + 102 [0x102b9d6] + 2580 runtime.mstart1 (in ___go_build_add_go) + 230 [0x102bad6] + 2580 runtime.sysmon (in ___go_build_add_go) + 371 [0x10330b3] + 2580 runtime.notetsleep (in ___go_build_add_go) + 105 [0x1009499] + 2580 runtime.notetsleep_internal (in ___go_build_add_go) + 269 [0x10092cd] + 2580 runtime.semasleep (in ___go_build_add_go) + 271 [0x1024e3f] + 2580 runtime.pthread_cond_timedwait_relative_np (in ___go_build_add_go) + 81 [0x1043301] + 2580 runtime.asmcgocall (in ___go_build_add_go) + 173 [0x1050ddd] + 2580 runtime.pthread_cond_timedwait_relative_np_trampoline (in ___go_build_add_go) + 20 [0x1053204] + 2580 _pthread_cond_wait (in libsystem_pthread.dylib) + 789 [0x7fff5779a5c2] + 2580 __psynch_cvwait (in libsystem_kernel.dylib) + 10 [0x7fff575d1a16] 2580 Thread_15197714 + 2580 runtime.mcall (in ___go_build_add_go) + 91 [0x104f52b] + 2580 runtime.goexit0 (in ___go_build_add_go) + 498 [0x102f552] + 2580 runtime.schedule (in ___go_build_add_go) + 314 [0x102eb6a] + 2580 runtime.findrunnable (in ___go_build_add_go) + 1244 [0x102e05c] + 2580 runtime.stopm (in ___go_build_add_go) + 227 [0x102cee3] + 2580 runtime.notesleep (in ___go_build_add_go) + 227 [0x1009163] + 2580 runtime.semasleep (in ___go_build_add_go) + 133 [0x1024db5] + 2580 runtime.pthread_cond_wait (in ___go_build_add_go) + 81 [0x1043291] + 2580 runtime.asmcgocall (in ___go_build_add_go) + 173 [0x1050ddd] + 2580 runtime.pthread_cond_wait_trampoline (in ___go_build_add_go) + 16 [0x10531e0] + 2580 _pthread_cond_wait (in libsystem_pthread.dylib) + 732 [0x7fff5779a589] + 2580 __psynch_cvwait (in libsystem_kernel.dylib) + 10 [0x7fff575d1a16] .... 一共重复了 10 个 thread. 我在研究一下 |
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7
xujiaja 2018-12-06 21:52:26 +08:00  1
我在 main 函数里面的循环 sleep，一秒创建一个协程的情况下，内存基本上稳定在第一次协程分配的值。应该是主程序 sleep 的情况下，并没有其他的对象要分配，所以就不回收了。
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9
HanMeiM 2018-12-07 10:50:30 +08:00
- -我也基本上维持在 1 - 1.1g 左右的内存占用
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10
Vegetable 2018-12-07 10:53:42 +08:00
测了一下你的代码,稳定一会儿 1.2g,后来忘记看了,过了十来分钟看一下 50M 了.
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