# Meaning of index\_time\_in\_millis in multi-CPU system **URL:** \ **Category:** Elasticsearch\ **Created:** [February 5, 2017, 9:59pm UTC](https://discuss.elastic.co/t/meaning-of-index-time-in-millis-in-multi-cpu-system/73996 "2017-02-05T21:59:47Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![RainTown](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/raintown/32/140206_2.png) [@RainTown](https://discuss.elastic.co/u/RainTown)\ **Post date:** [February 5, 2017, 9:59pm UTC](https://discuss.elastic.co/t/meaning-of-index-time-in-millis-in-multi-cpu-system/73996/1 "2017-02-05T21:59:47Z")
Hi A question about indexing and performance measuring. Under the \_nodes/stats API, I see I have a stat called indices.indexing.index\_time\_in\_millis. I am not sure how to interpret this number. (and others with time\_in\_milli suffix) Lets say I have 4 CPU system. If that number increases by 5000 in a 10 real (wall-clock) second interval, what's it telling me? Is it a) 1 of my CPUs was busy indexing for 5 seconds, and the others were idle OR b) All of my CPUs were bust for 5 seconds, so each was busy for approx 1.25 seconds. OR c) On average, 50% of the time the CPUs were bust doing indexing. OE d) something else. Put another way, can that difference in values of indices.indexing.index\_time\_in\_millis be (at maximum) over a 10 real (wall-clock) second interval be 40 seconds on 4 CPU system? and therefore (theoretically) 80 seconds on an 8 CPU system? Thanks RT ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [March 5, 2017, 10:00pm UTC](https://discuss.elastic.co/t/meaning-of-index-time-in-millis-in-multi-cpu-system/73996/2 "2017-03-05T22:00:15Z")
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