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Variation in CPU usage and time response in aggregation framework of MongoDB?

+2 votes
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I am using mongodb 3.2 (On ubuntu 14.04) and trying to query a large dataset (about 388 millions of little documents). During my aggregation tests I found that mongo sometimes uses 100% in one core and sometimes not and as a consequence, the time of response varies a lot.This CPU usage can also vary from an aggregation query to another (for example : if a want to aggregate more documents).

Please help me to understand better the functioning of this framework.

posted Apr 6, 2016 by anonymous

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