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                針對關鍵內核參數設定合適的值,目的是為了減少swap的傾向,并且讓內存和磁盤I/O不會出現大幅波動,導致瞬間波峰負載: 1、將vm.swappiness設置為5-10左右即可,甚至設置為0(RHEL 7以上則慎重設置為0,除非你允許OOM kill發生),以降低使用SWAP的機會; 2、將vm.dirty_background_ratio設置為5-10,將vm.dirty_ratio設置為它的兩倍左右,以確保能持續將臟數據刷新到磁盤,避免瞬間I/O寫,產生嚴重等待(和MySQL中的innodb_max_dirty_pages_pct類似); 3、將net.ipv4.tcp_tw_recycle、net.ipv4.tcp_tw_reuse都設置為1,減少TIME_WAIT,提高TCP效率; 4、至于網傳的read_ahead_kb、nr_requests這兩個參數,我經過測試后,發現對讀寫混合為主的OLTP環境影響并不大(應該是對讀敏感的場景更有效果),不過沒準是我測試方法有問題,可自行斟酌是否調整;
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