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https://github.com/superseriousbusiness/gotosocial.git
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acc333c40b
When GTS is running in a container runtime which has configured CPU or memory limits or under an init system that uses cgroups to impose CPU and memory limits the values the Go runtime sees for GOMAXPROCS and GOMEMLIMIT are still based on the host resources, not the cgroup. At least for the throttling middlewares which use GOMAXPROCS to configure their queue size, this can result in GTS running with values too big compared to the resources that will actuall be available to it. This introduces 2 dependencies which can pick up resource contraints from the current cgroup and tune the Go runtime accordingly. This should result in the different queues being appropriately sized and in general more predictable performance. These dependencies are a no-op on non-Linux systems or if running in a cgroup that doesn't set a limit on CPU or memory. The automatic tuning of GOMEMLIMIT can be disabled by either explicitly setting GOMEMLIMIT yourself or by setting AUTOMEMLIMIT=off. The automatic tuning of GOMAXPROCS can similarly be counteracted by setting GOMAXPROCS yourself.
61 lines
1.8 KiB
Go
61 lines
1.8 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package v2
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import (
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"fmt"
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"path/filepath"
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"strings"
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)
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// NestedGroupPath will nest the cgroups based on the calling processes cgroup
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// placing its child processes inside its own path
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func NestedGroupPath(suffix string) (string, error) {
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path, err := parseCgroupFile("/proc/self/cgroup")
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if err != nil {
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return "", err
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}
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return filepath.Join(path, suffix), nil
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}
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// PidGroupPath will return the correct cgroup paths for an existing process running inside a cgroup
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// This is commonly used for the Load function to restore an existing container
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func PidGroupPath(pid int) (string, error) {
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p := fmt.Sprintf("/proc/%d/cgroup", pid)
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return parseCgroupFile(p)
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}
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// VerifyGroupPath verifies the format of group path string g.
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// The format is same as the third field in /proc/PID/cgroup.
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// e.g. "/user.slice/user-1001.slice/session-1.scope"
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//
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// g must be a "clean" absolute path starts with "/", and must not contain "/sys/fs/cgroup" prefix.
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//
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// VerifyGroupPath doesn't verify whether g actually exists on the system.
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func VerifyGroupPath(g string) error {
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if !strings.HasPrefix(g, "/") {
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return ErrInvalidGroupPath
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}
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if filepath.Clean(g) != g {
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return ErrInvalidGroupPath
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}
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if strings.HasPrefix(g, "/sys/fs/cgroup") {
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return ErrInvalidGroupPath
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}
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return nil
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}
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