April 2018
Intermediate to advanced
508 pages
15h 22m
English
Content preview from PostgreSQL 10 High Performance - Third Edition
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IOPS
HD Tune includes a Random Access test that gives its results in terms of the standard IOPS figure, at various block sizes:
This is not far from the computed value derived previously for this drive: 69.5 IOPS.
The average speed computed number here (the poorly labeled avg. speed column) is always a good one to note when doing seek-based tests. It's easiest to explain what that means with a database-specific example. Consider that PostgreSQL reads in blocks of 8 KB each. Based on what we have seen, we could expect about 64 IOPS out of this drive as its worst-case performance, doing nothing but random seeks, at that block size. This turns ...
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