From Gentle Leopard, 3 Months ago, written in Plain Text.
  1. [reedwall ~]# sync; dd if=/dev/zero of=tempfile bs=1M count=1024; sync
  2. 1024+0 records in
  3. 1024+0 records out
  4. 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 4.24048 s, 253 MB/s
  5. [reedwall ~]# dd if=tempfile of=/dev/null bs=1M count=1024
  6. 1024+0 records in
  7. 1024+0 records out
  8. 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.160468 s, 6.7 GB/s
  9. [reedwall ~]# sysctl -w vm.drop_caches=3
  10. vm.drop_caches = 3
  11. [reedwall ~]# dd if=tempfile of=/dev/null bs=1M count=1024
  12. 1024+0 records in
  13. 1024+0 records out
  14. 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 15.1922 s, 70.7 MB/s
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