Reply to post: even microseconds are too large.

Aggressive HGST hurls flashy humdingers at online archiving

Alan Brown Silver badge

even microseconds are too large.

More like nano seconds.

FWIW the access time of the best DRAM is still in the 60ns range - and hasn't really changed for 20 years. Other ram technologies have far lower latency (ZRAM is 2-4ns for example) but cost more or aren't yet commercially viable.(*)

_worst_ case latency of PCIe 1.0 is 21ns, PCIe 2.0 is usually less than 10ns

NAND read latency is variable, but even 70us would be inordinately long.

(*) HP has been sampling memristors for a while. At 5-10ns latency I'd take 2Gb DIMMS _NOW_, given how much they'd speed up computational work needed here (the processors spend more time waiting for memory than they do crunching)

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