The Speed of Time
Brendan Gregg
SEPTEMBER 25, 2021
A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. Measuring the speed of time Is there already a microbenchmark for os::javaTimeMillis()? In 2019 myself and others tested kvm-clock and found it was only about 20% slower than tsc. Try changing the kernel clocksource.
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