Lecture 22 — November 19 , 2015

نویسندگان

  • Jelani Nelson
  • Johnny Ho
چکیده

In terms of exact numbers, hard drives support somewhere around 140MB/sec of sequential reads/writes, but only 120I/O’s/sec when doing reads/writes on random 4KB chunks. This is because the disk must physically spin to the read/write location. RAM supports somewhere around 5-10GB/sec of reads/writes, with much less penalty for random access. SSDs/Flash is somewhere in the middle, but with the issue that each index can only be written to a limited number of times.

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تاریخ انتشار 2015