time_io.c 10MB file, read 1KB, 10KB, 100Kb, 1MB 
On rebooted machine, first read 
first read time 0.12 seconds 
more reads, cached? consistent? 
2 read time 0.06 seconds for 1KB block 
3 read time 0.06 seconds for 1KB block 
4 read time 0.06 seconds for 1KB block 
5 read time 0.06 seconds for 1KB block 
6 read time 0.06 seconds for 1KB block 
7 read time 0.06 seconds for 1KB block 
8 read time 0.06 seconds for 1KB block 
9 read time 0.05 seconds for 1KB block 
more reads, cached? consistent? 
2 read time 0.05 seconds for 10KB block 
3 read time 0.05 seconds for 10KB block 
4 read time 0.04 seconds for 10KB block 
5 read time 0.05 seconds for 10KB block 
6 read time 0.05 seconds for 10KB block 
7 read time 0.05 seconds for 10KB block 
8 read time 0.05 seconds for 10KB block 
9 read time 0.05 seconds for 10KB block 
more reads, cached? consistent? 
2 read time 0.08 seconds for 100KB block 
3 read time 0.07 seconds for 100KB block 
4 read time 0.09 seconds for 100KB block 
5 read time 0.07 seconds for 100KB block 
6 read time 0.07 seconds for 100KB block 
7 read time 0.06 seconds for 100KB block 
8 read time 0.08 seconds for 100KB block 
9 read time 0.08 seconds for 100KB block 
more reads, cached? consistent? 
2 read time 0.09 seconds for 1000KB block 
3 read time 0.09 seconds for 1000KB block 
4 read time 0.09 seconds for 1000KB block 
5 read time 0.09 seconds for 1000KB block 
6 read time 0.11 seconds for 1000KB block 
7 read time 0.10 seconds for 1000KB block 
8 read time 0.10 seconds for 1000KB block 
9 read time 0.10 seconds for 1000KB block