Tip: Use tsc clock source

(Kao Makino) #1

Since it hasn’t been mentioned in this forum, let me share a little performance tuning tip.
When you’re running FoundationDB on a VM (e.g. AWS EC2),
use tsc clock source instead of xen clock source whenever possible.
Our in-house microbenchmark showed significant differences, especially for small reads.

GET: 280064 reads/sec => 324192 reads/sec (+15.8%)
GET RANGE (5-key range) 205648 reads/sec => 235312 reads/sec (+14.4%)

(Daniil Gitelson) #2

How is this configured?

(Kao Makino) #3

To check what you currently have:
cat /sys/devices/system/clocksource/clocksource0/current_clocksource

To set it to tsc:
echo 'tsc' > /sys/devices/system/clocksource/clocksource0/current_clocksource