"I want to write about Cassandra performance tuning, but first I
need to cover some basics: how to use vmstat, iostat, and top to
understand what part of your system is the bottleneck -- not just
for Cassandra but for any system.
"vmstat
"You will typically run vmstat with "vmstat sampling-period",
e.g., "vmstat 5." The output looks like this:
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
20 0 195540 32772 6952 576752 0 0 11 12 38 43 1 0 99 0
22 2 195536 35988 6680 575132 6 0 2952 14 959 16375 72 21 4 3
