3 ms·
SSDs are only ~4x faster than magnetic last I checked. If RAM is 100ns per access, and hd access is down from say, 1ms to 0.25ms, that's still a huge huge gap.
by SapphireSun 10y ago
SSDs are only ~4x faster than magnetic last I checked. If RAM is 100ns per access, and hd access is down from say, 1ms to 0.25ms, that's still a huge huge gap. 4x isn't even an order of magnitude.
EDIT: see comment below for more accurate numbers.
- snowwindwaves 10y agoFrom the article: >A typical reference to RAM is in the area of 100ns, accessing data on a SSD 150μs (so 1500 times of the RAM) and accessing data on a rotating disk 10ms (so 100.000 times the RAM.
- SapphireSun 10y agoThank you for the correction. I should have read more carefully. Still, we're talking 3 orders of magnitude for SSD vs RAM.
- xinyhn 10y agoreminded me of this... Latency Numbers Every Programmer Should Know https://gist.github.com/jboner/2841832 https://gist.github.com/jboner/2841832