github.com/onflow/flow-go@v0.35.7-crescendo-preview.23-atree-inlining/network/p2p/builder/libp2pscaler.go (about)

     1  package p2pbuilder
     2  
     3  import (
     4  	"fmt"
     5  	"math"
     6  
     7  	"github.com/pbnjay/memory"
     8  	"golang.org/x/sys/unix"
     9  )
    10  
    11  func getNumFDs() (int, error) {
    12  	var l unix.Rlimit
    13  	if err := unix.Getrlimit(unix.RLIMIT_NOFILE, &l); err != nil {
    14  		return 0, err
    15  	}
    16  	return int(l.Cur), nil
    17  }
    18  
    19  func allowedMemory(scaleFactor float64) (int64, error) {
    20  	if scaleFactor <= 0 || scaleFactor > 1 {
    21  		return 0, fmt.Errorf("memory scale factor must be greater than 0 and less than or equal to 1: %f", scaleFactor)
    22  	}
    23  	return int64(math.Floor(float64(memory.TotalMemory()) * scaleFactor)), nil
    24  }
    25  
    26  func allowedFileDescriptors(scaleFactor float64) (int, error) {
    27  	if scaleFactor <= 0 || scaleFactor > 1 {
    28  		return 0, fmt.Errorf("fd scale factor must be greater than 0 and less than or equal to 1: %f", scaleFactor)
    29  	}
    30  	fd, err := getNumFDs()
    31  	if err != nil {
    32  		return 0, fmt.Errorf("failed to get file descriptor limit: %w", err)
    33  	}
    34  	return int(math.Floor(float64(fd) * scaleFactor)), nil
    35  }