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minio/cmd/server-rlimit-nix.go

84 lines
2.7 KiB

// +build !windows,!plan9
/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"syscall"
"github.com/minio/minio/pkg/sys"
)
// For all unixes we need to bump allowed number of open files to a
// higher value than its usual default of '1024'. The reasoning is
// that this value is too small for a server.
func setMaxOpenFiles() error {
var rLimit syscall.Rlimit
err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
if err != nil {
return err
}
// Set the current limit to Max, it is usually around 4096.
// TO increase this limit further user has to manually edit
// `/etc/security/limits.conf`
rLimit.Cur = rLimit.Max
return syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rLimit)
}
// Set max memory used by minio as a process, this value is usually
// set to 'unlimited' but we need to validate additionally to verify
// if any hard limit is set by the user, in such a scenario would need
// to reset the global max cache size to be 80% of the hardlimit set
// by the user. This is done to honor the system limits and not crash.
func setMaxMemory() error {
var rLimit syscall.Rlimit
err := syscall.Getrlimit(syscall.RLIMIT_AS, &rLimit)
if err != nil {
return err
}
// Set the current limit to Max, it is default 'unlimited'.
// TO decrease this limit further user has to manually edit
// `/etc/security/limits.conf`
rLimit.Cur = rLimit.Max
err = syscall.Setrlimit(syscall.RLIMIT_AS, &rLimit)
if err != nil {
return err
}
err = syscall.Getrlimit(syscall.RLIMIT_AS, &rLimit)
if err != nil {
return err
}
// Validate if rlimit memory is set to lower
// than max cache size. Then we should use such value.
if uint64(rLimit.Cur) < globalMaxCacheSize {
globalMaxCacheSize = uint64(float64(50*rLimit.Cur) / 100)
}
// Make sure globalMaxCacheSize is less than RAM size.
stats, err := sys.GetStats()
if err != nil && err != sys.ErrNotImplemented {
return err
}
// If TotalRAM is >= minRAMSize we proceed to enable cache.
// cache is always 50% of the totalRAM.
if err == nil && stats.TotalRAM >= minRAMSize {
globalMaxCacheSize = uint64(float64(50*stats.TotalRAM) / 100)
}
return nil
}