minio/cmd/server-rlimit.go
Harshavardhana 91d419ee6c
warn issues about large block I/O performance for Linux older than 4.0.0 (#14524)
This PR simply adds a warning message when it detects older kernel
versions and warn's them about potential performance issues on this
kernel.

The issue can be seen only with parallel I/O across all drives
on denser setups such as 90 drives or 45 drives per server configurations.
2022-03-10 17:36:13 -08:00

81 lines
2.3 KiB
Go

// 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/minio/minio/internal/kernel"
"github.com/minio/minio/internal/logger"
"github.com/minio/pkg/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() (err error) {
// Set the Go runtime max threads threshold to 90% of kernel setting.
sysMaxThreads, mErr := sys.GetMaxThreads()
if mErr == 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
}
// Set max memory limit as current memory limit.
if _, maxLimit, err = sys.GetMaxMemoryLimit(); err != nil {
return err
}
err = sys.SetMaxMemoryLimit(maxLimit, maxLimit)
return err
}