Ubuntu清理内存办法
清空pagecache:
# echo 1 > /proc/sys/vm/drop_caches
清空dentries和indoes
# echo 2 > /proc/sys/vm/drop_caches
清空所有缓存(pagecache、dentries和indoes)
# echo 3 > /proc/sys/vm/drop_caches (或 sysctl -w vm.drop_caches=3)
调整内存和swap优先级
# cat /proc/sys/vm/drop_caches (默认为60,100为最高,0为不用)