redis memory and cpu spikes

Question

We use redis for some data in our app, and it\'s totally great. I noticed however occasional cpu and memory spikes on the redis-server process.

Answer 1

If I recall correctly, redis forks the process when it does a background save, but only duplicates the memory that is being changed while the save is in progress. So the bump in CPU/memory would depend heavily on how much of the data is being changed while the save is running. So it could certainly be a huge spike at times, and a much lesser spike other times (or none at all, depending on how your load looks).