Hello all,
I posted this question on node-forward/help on Gitter, so apologies if you are
seeing this again.
I am stumped by what must clearly be a misreading on my part. Node 0.10 docs
say that each element of os.cpus() contains information about each CPU/core.
This information includes "the number of milliseconds the CPU/core spent in:
user, nice, sys, idle, and irq” (the docs do not say milliseconds of what, but
I assume it means milliseconds since the system was last started). Note that
this used to be, in v0.8 (and I assume before), reported in CPU ticks, but
seems to have switched to milliseconds for v0.10.
Now for the puzzle: say I do this:
console.log(os.cpus()[0].times.idle);
setTimeout(function() { console.log(os.cpus()[0].times.idle); }, 2000);
The output I see is:
39035126800
39035144500
Assuming that ordering of CPUs/cores is consistent in the array returned by
os.cpus(), it’s not clear how to square the above with the docs. The difference
between the times reported is 17700ms i.e., CPU 0 was idle for 17 seconds in
the 2 seconds between the two calls!
I guess I am doing something trivially wrong in the above, but what is it?
Any help appreciated!
—ravi
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