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The book Systems Performance: Enterprise and the Cloud has a great table that illustrates just how enormous these time differentials are. Just translate computer time into arbitrary seconds:

1 CPU cycle    0.3 ns    1 s
Level 1 cache access    0.9 ns    3 s
Level 2 cache access    2.8 ns    9 s
Level 3 cache access    12.9 ns    43 s
Main memory access    120 ns    6 min
Solid-state disk I/O    50-150 ?s    2-6 days
Rotational disk I/O    1-10 ms    1-12 months
Internet: SF to NYC    40 ms    4 years
Internet: SF to UK    81 ms    8 years
Internet: SF to Australia    183 ms    19 years
OS virtualization reboot    4 s    423 years
SCSI command time-out    30 s    3000 years
Hardware virtualization reboot    40 s    4000 years
Physical system reboot    5 m    32 millenia

The Infinite Space Between Words

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