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I haven't done the re-scaling of this analogy, but to many years ago I took a performance class. The instructor used an illustration that if you assume that moving stuff from one register to another took one instruction cycle, then to scale it up to 1 second per instruction cycle to help give you a sense of scale: Register to register: 1 second Register to cache: 10 seconds Register to memory: 1 minute Register to drum: 8 hours (sometimes implemented as a head per track disk, old technology now, often used for virtual memory back then) Register to disk: 2.8 days This is from memory, but it gives the scale of things. I wonder what the comparison would be today for a reasonably fast machine, like a 2GHz CPU? (I'm a little to out of it to look up the info now days) Someone interested? Might want to add some relative information for: UPB Flash key fob CDRom Disk 7200RPM 8mSec ATA100 Disk 10000RPM 6mSec ATA100 Average rotational delay and seek time matter in addition to the speed of data transmission Disk 10000RPM Ultra160 SCSI Gigabit attached NAS SAN? Inquiring minds want to know :)
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