3 ms·
About a day is ~90 microseconds, which is really fast, even for an SSD. The FusionIO folks claim they can do 30 microseconds though, which is really incredible,
by rictic 15y ago
About a day is ~90 microseconds, which is really fast, even for an SSD. The FusionIO folks claim they can do 30 microseconds though, which is really incredible, just a couple hundred times slower than ram.
I wanted to say that that was within an order of magnitude to the cost of a simple system call, but it looks like system calls are much much faster than my intuition suggested[1], and they're in the range of RAM access.
1] http://stackoverflow.com/questions/1860253/what-is-the-overhead-involved-in-a-mode-switch http://stackoverflow.com/questions/1860253/what-is-the-overh...
- morsch 15y agoLooking at a random (2010) SSD review, it lists average read access times of less than 0.15 milliseconds = 150 microseconds for all of the SSDs involved. The long standing "gold standard" Intel X25-M had 70 μs. http://www.tweaktown.com/reviews/3375/corsair_force_f120_120gb_sandforce_solid_state_drive/index7.html http://www.tweaktown.com/reviews/3375/corsair_force_f120_120...
- rictic 15y agoWow that's faster than the range I was working with. Will look into it, thanks for the info.