BLPOP Performance

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Chase

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Nov 25, 2015, 10:59:48 AM11/25/15

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Hi - I recently did an experiment with REDIS to test it out as a queuing system. I modeled each queue as a list and setup a single sender to push a 2 KB message into a queue. I also setup receivers using BLOP. I monitored the CPU usage for various number of keys and I saw a linear relationship between number of keys on the BLPOP and the amount of CPU used. Effectively each addition of 25 keys resulted in another 6% increase in CPU on the redis server. For example, 100 keys added about 25% to REDIS CPU. However, adding 4 clients that perform BLPOP of only 25 keys results in only a 6% increase in CPU. Is this expected behavior ? It seems as if it would be desirable to have more connections and less keys.