REDIS is single threaded. So what does it mean when I deploy it to machines with 2 or more cores? How does the single thread utilize these multiple cores?
In: Engineering
In order to process multiple threads the OS runs the thread in turns, each one gets to run on an available core for a few milliseconds so over time all threads can progress.
If a thread has no CPU affinity it can happen that on the next turn it runs on a different core, so the thread technically runs on multiple cores, but only on one core at a time. To make it clear this means that at most it’s processed as fast as a single core allows.
Because of this, when running a heavy thread on a dual core CPU the task manager may display both cores having a load around 50% giving the impression the thread runs on both cores simultaneously but this really means it runs on each one about 50% of the time.
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