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LinuxでのMacのパージに相当するものは何ですか？

Macでは、purgeを使用してメモリを解放します。 Linux（Ubuntu Server）でこれに相当するものは何ですか？ apt-get install purgeは何もくれませんでした。 Macのpurgeに慣れていない場合は、manページをご覧ください。

purge(8)                  BSD System Manager's Manual                 purge(8)

NAME
     purge -- force disk cache to be purged (flushed and emptied)

SYNOPSIS
     purge

DESCRIPTION
     Purge can be used to approximate initial boot conditions with a cold disk
     buffer cache for performance analysis. It does not affect anonymous mem-
     ory that has been allocated through malloc, vm_allocate, etc.

SEE ALSO
     sync(8), malloc(3)

                              September 20, 2005
linuxlinux-kernelmemory
10
Mohsen

これはpurgeでも同じことができます：

sync && echo 3 > /proc/sys/vm/drop_caches

man procから：

/proc/sys/vm/drop_caches (since Linux 2.6.16)
              Writing to this file causes the kernel  to  drop  clean  caches,
              dentries  and  inodes from memory, causing that memory to become
              free.

              To free pagecache, use echo  1  >  /proc/sys/vm/drop_caches;  to
              free dentries and inodes, use echo 2 > /proc/sys/vm/drop_caches;
              to  free  pagecache,  dentries  and  inodes,  use   echo   3   >
              /proc/sys/vm/drop_caches.

              Because this is a nondestructive operation and dirty objects are
              not freeable, the user should run sync(8) first.

そしてman syncから：

NAME
       sync - flush file system buffers

DESCRIPTION
       Force changed blocks to disk, update the super block.
16
cuonglm