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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.
119 lines
3.8 KiB
Go
119 lines
3.8 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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const (
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// _cgroupFSType is the Linux CGroup file system type used in
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// `/proc/$PID/mountinfo`.
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_cgroupFSType = "cgroup"
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// _cgroupSubsysCPU is the CPU CGroup subsystem.
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_cgroupSubsysCPU = "cpu"
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// _cgroupSubsysCPUAcct is the CPU accounting CGroup subsystem.
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_cgroupSubsysCPUAcct = "cpuacct"
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// _cgroupSubsysCPUSet is the CPUSet CGroup subsystem.
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_cgroupSubsysCPUSet = "cpuset"
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// _cgroupSubsysMemory is the Memory CGroup subsystem.
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_cgroupSubsysMemory = "memory"
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// _cgroupCPUCFSQuotaUsParam is the file name for the CGroup CFS quota
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// parameter.
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_cgroupCPUCFSQuotaUsParam = "cpu.cfs_quota_us"
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// _cgroupCPUCFSPeriodUsParam is the file name for the CGroup CFS period
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// parameter.
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_cgroupCPUCFSPeriodUsParam = "cpu.cfs_period_us"
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)
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const (
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_procPathCGroup = "/proc/self/cgroup"
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_procPathMountInfo = "/proc/self/mountinfo"
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)
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// CGroups is a map that associates each CGroup with its subsystem name.
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type CGroups map[string]*CGroup
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// NewCGroups returns a new *CGroups from given `mountinfo` and `cgroup` files
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// under for some process under `/proc` file system (see also proc(5) for more
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// information).
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func NewCGroups(procPathMountInfo, procPathCGroup string) (CGroups, error) {
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cgroupSubsystems, err := parseCGroupSubsystems(procPathCGroup)
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if err != nil {
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return nil, err
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}
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cgroups := make(CGroups)
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newMountPoint := func(mp *MountPoint) error {
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if mp.FSType != _cgroupFSType {
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return nil
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}
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for _, opt := range mp.SuperOptions {
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subsys, exists := cgroupSubsystems[opt]
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if !exists {
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continue
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}
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cgroupPath, err := mp.Translate(subsys.Name)
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if err != nil {
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return err
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}
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cgroups[opt] = NewCGroup(cgroupPath)
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}
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return nil
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}
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if err := parseMountInfo(procPathMountInfo, newMountPoint); err != nil {
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return nil, err
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}
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return cgroups, nil
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}
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// NewCGroupsForCurrentProcess returns a new *CGroups instance for the current
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// process.
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func NewCGroupsForCurrentProcess() (CGroups, error) {
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return NewCGroups(_procPathMountInfo, _procPathCGroup)
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}
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// CPUQuota returns the CPU quota applied with the CPU cgroup controller.
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// It is a result of `cpu.cfs_quota_us / cpu.cfs_period_us`. If the value of
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// `cpu.cfs_quota_us` was not set (-1), the method returns `(-1, nil)`.
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func (cg CGroups) CPUQuota() (float64, bool, error) {
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cpuCGroup, exists := cg[_cgroupSubsysCPU]
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if !exists {
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return -1, false, nil
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}
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cfsQuotaUs, err := cpuCGroup.readInt(_cgroupCPUCFSQuotaUsParam)
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if defined := cfsQuotaUs > 0; err != nil || !defined {
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return -1, defined, err
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}
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cfsPeriodUs, err := cpuCGroup.readInt(_cgroupCPUCFSPeriodUsParam)
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if err != nil {
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return -1, false, err
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}
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return float64(cfsQuotaUs) / float64(cfsPeriodUs), true, nil
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}
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