[root@localhost shm]# time dd if=/dev/zero of=/dev/shm/test.dat bs=8k count=2088608
2088608+0 records in
2088608+0 records out
17109876736 bytes (17 GB) copied, 11.1725 seconds, 1.5 GB/s
real 0m11.176s
user 0m0.053s
sys 0m11.120s
[root@localhost shm]# time dd if=/dev/shm/test.dat of=/dev/null bs=8k count=2088608
2088608+0 records in
2088608+0 records out
17109876736 bytes (17 GB) copied, 7.38662 seconds, 2.3 GB/s
real 0m7.389s
user 0m4.658s
sys 0m2.731s
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