close Warning: Can't synchronize with repository "(default)" (Unsupported version control system "svn": /usr/lib/python2.7/dist-packages/libsvn/_core.so: failed to map segment from shared object: Cannot allocate memory). Look in the Trac log for more information.

Changes between Version 18 and Version 19 of jazz/Performance_Tuning


Ignore:
Timestamp:
Aug 22, 2010, 1:57:53 AM (15 years ago)
Author:
jazz
Comment:

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  • jazz/Performance_Tuning

    v18 v19  
    3939echo "kernel.shmmni = 4096"      >> /etc/sysctl.conf
    4040}}}
     41
     42 * Cache Memroy -
     43   * 設定 vm.drop_caches 觸發 kernel 回收用於 cache 的記憶體。
     44{{{
     45echo 1 > /proc/sys/vm/drop_caches
     46    or
     47sysctl -w vm.drop_caches=1
     48}}}
     49   * 設定 vm.vfs_cache_pressure 使 kernel 更勤於回收 cache。
     50{{{
     51sysctl -w vm.vfs_cache_pressure=n  (n > 100)
     52]}}
    4153
    4254== System Performance Tuning : File System ==