Meaning of index_time_in_millis in multi-CPU system

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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

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