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[test ~]# mount -t tmpfs none shmtmp/
[test ~]# free -m
total used free shared buffers cached
Mem: 938 338 600 0 69 152
-/+ buffers/cache: 116 822
Swap: 0 0 0
[test ~]# dd if=/dev/zero count=10000 of=shmtmp/f1
10000+0 records in
10000+0 records out
5120000 bytes (5.1 MB) copied, 0.023058 seconds, 222 MB/s
[test ~]# free -m
total used free shared buffers cached
Mem: 938 343 595 0 69 157
-/+ buffers/cache: 116 822
Swap: 0 0 0
[test ~]# dd if=/dev/zero count=10000 of=shmtmp/f2
10000+0 records in
10000+0 records out
5120000 bytes (5.1 MB) copied, 0.025081 seconds, 204 MB/s
[test ~]# free -m
total used free shared buffers cached
Mem: 938 348 590 0 69 162
-/+ buffers/cache: 116 822
Swap: 0 0 0
[test ~]# rm shmtmp/f1 shmtmp/f2
[test ~]# free -m
total used free shared buffers cached
Mem: 938 338 599 0 69 152
-/+ buffers/cache: 116 822
Swap: 0 0 0