github.com/pawelgaczynski/gain@v0.4.0-alpha.0.20230821120126-41f1e60a18da/linux_tuning.go (about)

     1  // Copyright (c) 2023 Paweł Gaczyński
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package gain
    16  
    17  import (
    18  	"fmt"
    19  	"os"
    20  	"runtime"
    21  	"syscall"
    22  
    23  	"golang.org/x/sys/unix"
    24  )
    25  
    26  func setProcessPriority() error {
    27  	pid := os.Getpid()
    28  
    29  	return os.NewSyscallError("setpriority", syscall.Setpriority(syscall.PRIO_PROCESS, pid, -19))
    30  }
    31  
    32  func setCPUAffinity(index int) error {
    33  	var newMask unix.CPUSet
    34  
    35  	newMask.Zero()
    36  
    37  	cpuIndex := (index) % (runtime.NumCPU())
    38  	newMask.Set(cpuIndex)
    39  
    40  	err := unix.SchedSetaffinity(0, &newMask)
    41  	if err != nil {
    42  		return fmt.Errorf("SchedSetaffinity: %w, %v", err, newMask)
    43  	}
    44  
    45  	return nil
    46  }