minio/cmd/server-rlimit.go

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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"runtime"
"runtime/debug"
"github.com/dustin/go-humanize"
"github.com/minio/madmin-go/v3/kernel"
"github.com/minio/minio/internal/logger"
"github.com/minio/pkg/v3/sys"
)
func oldLinux() bool {
currentKernel, err := kernel.CurrentVersion()
if err != nil {
// Could not probe the kernel version
return false
}
if currentKernel == 0 {
// We could not get any valid value return false
return false
}
// legacy linux indicator for printing warnings
// about older Linux kernels and Go runtime.
return currentKernel < kernel.Version(4, 0, 0)
}
func setMaxResources(ctx serverCtxt) (err error) {
// Set the Go runtime max threads threshold to 90% of kernel setting.
sysMaxThreads, err := sys.GetMaxThreads()
if err == nil {
minioMaxThreads := (sysMaxThreads * 90) / 100
// Only set max threads if it is greater than the default one
if minioMaxThreads > 10000 {
debug.SetMaxThreads(minioMaxThreads)
}
}
var maxLimit uint64
// Set open files limit to maximum.
if _, maxLimit, err = sys.GetMaxOpenFileLimit(); err != nil {
return err
}
if maxLimit < 4096 && runtime.GOOS != globalWindowsOSName {
logger.Info("WARNING: maximum file descriptor limit %d is too low for production servers. At least 4096 is recommended. Fix with \"ulimit -n 4096\"",
maxLimit)
}
if err = sys.SetMaxOpenFileLimit(maxLimit, maxLimit); err != nil {
return err
}
_, vssLimit, err := sys.GetMaxMemoryLimit()
if err != nil {
return err
}
if vssLimit > 0 && vssLimit < humanize.GiByte {
logger.Info("WARNING: maximum virtual memory limit (%s) is too small for 'go runtime', please consider setting `ulimit -v` to unlimited",
humanize.IBytes(vssLimit))
}
if ctx.MemLimit > 0 {
maxLimit = ctx.MemLimit
}
if maxLimit > 0 {
debug.SetMemoryLimit(int64(maxLimit))
}
// Do not use RLIMIT_AS as that is not useful and at times on systems < 4Gi
// this can crash the Go runtime if the value is smaller refer
// - https://github.com/golang/go/issues/38010
// - https://github.com/golang/go/issues/43699
// So do not add `sys.SetMaxMemoryLimit()` this is not useful for any practical purposes.
return nil
}