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From 牛兆捷 <nzjem...@gmail.com>
Subject question about cpu utilization
Date Wed, 08 May 2013 15:25:47 GMT
I saw the application container log to trace the map-reduce application.

For map task, I find there are mainly 3 phase: spilit input, sort and spill
I set the enough memory to make sure the input can stay in memory.

Initially, I thought the highest cpu utilization will appear in sort phase
because the other two phase focus on IO,however, it doesn't behave as what
I thought. On the contrary, the cpu utilization during  the other phase are

Anyone know the reason?


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