Linux釋放內存
釋放網頁緩存(To free pagecache):
sync; echo 1 > /proc/sys/vm/drop_caches
釋放目錄項和索引(To free dentries and inodes):
sync; echo 2 > /proc/sys/vm/drop_caches
釋放網頁緩存，目錄項和索引（To free pagecache, dentries and inodes）:
sync; echo 3 > /proc/sys/vm/drop_caches
清理yum緩存
清理yum緩存使用yum clean 命令，yum clean 的參數有headers, packages, metadata, dbcache, plugins, expire-cache, rpmdb, all
yum clean headers #清理/var/cache/yum的headersyum clean packages #清理/var/cache/yum下的軟件包yum clean metadata...