mirror of
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.
104 lines
2.8 KiB
Go
104 lines
2.8 KiB
Go
// Copyright (c) 2017 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//go:build linux
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// +build linux
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package cgroups
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import (
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"bufio"
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"os"
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"strconv"
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"strings"
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)
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const (
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_cgroupSep = ":"
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_cgroupSubsysSep = ","
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)
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const (
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_csFieldIDID = iota
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_csFieldIDSubsystems
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_csFieldIDName
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_csFieldCount
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)
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// CGroupSubsys represents the data structure for entities in
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// `/proc/$PID/cgroup`. See also proc(5) for more information.
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type CGroupSubsys struct {
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ID int
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Subsystems []string
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Name string
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}
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// NewCGroupSubsysFromLine returns a new *CGroupSubsys by parsing a string in
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// the format of `/proc/$PID/cgroup`
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func NewCGroupSubsysFromLine(line string) (*CGroupSubsys, error) {
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fields := strings.SplitN(line, _cgroupSep, _csFieldCount)
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if len(fields) != _csFieldCount {
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return nil, cgroupSubsysFormatInvalidError{line}
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}
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id, err := strconv.Atoi(fields[_csFieldIDID])
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if err != nil {
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return nil, err
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}
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cgroup := &CGroupSubsys{
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ID: id,
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Subsystems: strings.Split(fields[_csFieldIDSubsystems], _cgroupSubsysSep),
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Name: fields[_csFieldIDName],
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}
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return cgroup, nil
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}
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// parseCGroupSubsystems parses procPathCGroup (usually at `/proc/$PID/cgroup`)
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// and returns a new map[string]*CGroupSubsys.
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func parseCGroupSubsystems(procPathCGroup string) (map[string]*CGroupSubsys, error) {
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cgroupFile, err := os.Open(procPathCGroup)
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if err != nil {
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return nil, err
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}
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defer cgroupFile.Close()
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scanner := bufio.NewScanner(cgroupFile)
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subsystems := make(map[string]*CGroupSubsys)
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for scanner.Scan() {
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cgroup, err := NewCGroupSubsysFromLine(scanner.Text())
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if err != nil {
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return nil, err
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}
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for _, subsys := range cgroup.Subsystems {
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subsystems[subsys] = cgroup
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}
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}
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if err := scanner.Err(); err != nil {
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return nil, err
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}
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return subsystems, nil
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}
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