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https://github.com/git-pkgs/proxy.git
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Nothing set GOMEMLIMIT, so in a container the heap could grow until the container was OOM-killed while much of it was garbage, for example while large metadata documents were being rewritten. At startup on Linux, read the cgroup v2 or v1 memory limit and set the runtime's soft limit to 80% of it, leaving room for git subprocesses. An explicit GOMEMLIMIT wins.
66 lines
1.6 KiB
Go
66 lines
1.6 KiB
Go
package memlimit
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import (
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"testing"
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"testing/fstest"
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)
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func TestCgroupLimit(t *testing.T) {
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const gib = 1 << 30
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for _, tt := range []struct {
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name string
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files map[string]string
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want int64
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}{
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{
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name: "cgroup v2 container",
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files: map[string]string{"proc/self/cgroup": "0::/\n", "sys/fs/cgroup/memory.max": "2147483648\n"},
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want: 2 * gib,
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},
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{
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name: "cgroup v2 own cgroup",
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files: map[string]string{
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"proc/self/cgroup": "0::/system.slice/proxy.service\n",
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"sys/fs/cgroup/system.slice/proxy.service/memory.max": "1073741824\n",
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},
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want: gib,
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},
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{
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name: "cgroup v2 unlimited",
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files: map[string]string{"proc/self/cgroup": "0::/\n", "sys/fs/cgroup/memory.max": "max\n"},
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},
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{
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name: "cgroup v1",
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files: map[string]string{
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"proc/self/cgroup": "12:cpu,cpuacct:/\n4:memory:/\n",
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"sys/fs/cgroup/memory/memory.limit_in_bytes": "536870912\n",
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},
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want: gib / 2,
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},
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{
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name: "cgroup v1 unlimited",
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files: map[string]string{
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"proc/self/cgroup": "4:memory:/\n",
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"sys/fs/cgroup/memory/memory.limit_in_bytes": "9223372036854771712\n",
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},
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},
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{
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name: "malformed",
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files: map[string]string{"sys/fs/cgroup/memory.max": "lots\n"},
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},
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{
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name: "no cgroup files",
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},
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} {
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t.Run(tt.name, func(t *testing.T) {
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fsys := fstest.MapFS{}
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for name, data := range tt.files {
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fsys[name] = &fstest.MapFile{Data: []byte(data)}
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}
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got, ok := cgroupLimit(fsys)
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if got != tt.want || ok != (tt.want != 0) {
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t.Errorf("cgroupLimit = %d, %v; want %d", got, ok, tt.want)
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}
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})
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}
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}
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