Performance Tuning

System Performance Tuning : Memory

• Share Memory

  echo "kernel.shmall = 796917578" >> /etc/sysctl.conf
  echo "kernel.shmmax = 796917578" >> /etc/sysctl.conf
  echo "kernel.shmmni = 4096"      >> /etc/sysctl.conf
  

System Performance Tuning : File System

• /etc/security/limits.conf - 每個程序(process)可以開啟檔案的個數(number limits of open files per process)

  /etc/security/limits.conf

  @@ -49 +49 @@
   #ftp             -       chroot          /ftp
   #@student        -       maxlogins       4
   
  +*      soft        nofile        8192
  +
   # End of file

I/O Performance Tuning

Network Performance Tuning

• TCP Tuning

  echo 262144               > /proc/sys/net/core/rmem_default
  echo 8388608              > /proc/sys/net/core/wmem_max
  echo 8388608              > /proc/sys/net/core/rmem_max
  echo "4096 87380 4194304" > /proc/sys/net/ipv4/tcp_rmem
  echo "4096 65536 4194304" > /proc/sys/net/ipv4/tcp_wmem