On Apr 17, 2008, at 3:32 PM, YKY (Yan King Yin) wrote:
Disk access rate is ~10 times faster than ethernet access rate. IMO, if RAM is not enough the next thing to turn to should be the harddisk.
Eh? Ethernet latency is sub-millisecond, and in a highly tuned system approaches the 10 microsecond range for something local. Much, much faster than disk if the remote node has your data in RAM and is relatively local.
Note that "relatively local" can mean geographically regional. The round-trip RAM access time from my machine to a machine on the other side of town is a fraction of millisecond over the Internet connection (not hypothetical, actually measured at ~400 microseconds). I wish disk access was even remotely that good. And this was with inexpensive Gigabit Ethernet.
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