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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.
62 lines
1.8 KiB
Go
62 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 cgroups
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import (
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"errors"
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)
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var (
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// ErrIgnoreSubsystem allows the specific subsystem to be skipped
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ErrIgnoreSubsystem = errors.New("skip subsystem")
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// ErrDevicesRequired is returned when the devices subsystem is required but
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// does not exist or is not active
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ErrDevicesRequired = errors.New("devices subsystem is required")
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)
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// InitOpts allows configuration for the creation or loading of a cgroup
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type InitOpts func(*InitConfig) error
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// InitConfig provides configuration options for the creation
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// or loading of a cgroup and its subsystems
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type InitConfig struct {
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// InitCheck can be used to check initialization errors from the subsystem
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InitCheck InitCheck
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}
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func newInitConfig() *InitConfig {
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return &InitConfig{
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InitCheck: RequireDevices,
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}
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}
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// InitCheck allows subsystems errors to be checked when initialized or loaded
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type InitCheck func(Subsystem, Path, error) error
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// AllowAny allows any subsystem errors to be skipped
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func AllowAny(_ Subsystem, _ Path, _ error) error {
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return ErrIgnoreSubsystem
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}
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// RequireDevices requires the device subsystem but no others
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func RequireDevices(s Subsystem, _ Path, _ error) error {
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if s.Name() == Devices {
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return ErrDevicesRequired
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}
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return ErrIgnoreSubsystem
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}
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