measure of the latency on an insert in the cache
I'm looking forward to know best practices on the measurement of latency on an insert in the cache.Imagine that we have a fill of storage cache disabled on one side than tags given with such a notion of time before mailing in cluster. On the other side a client connected to the proxy listens to eventInsert or something similar, to recover the stored object and label it once again, then the latency would be the tag2 - tag1.
Whereas we expect this number is of the order of milliseconds (< 5ms), what is the best way to accurately measure (perhaps independent of time system).
my group is based on Windows. I am aware of the granularity of 15ms on System.currentTimeMillis (), and also the dependence / System.nanoTime processor (), making them practically useless/incorrect in this scenario.
What is the alternative/practice option?
Coherence provides a timing specific, consistent, high resolution on the cluster that I can use?
Hi Dadashy,
Thanks for pointing these stupid mistakes about cMillis vs cMillisTotal, and leaving off some fairly significant zeros, I corrected the original message.
As for the relevance of the conversion of millis, nanos, I maintain that it is a viable approach to subsidiary millisecond latency measurement. The reason why it 'works' for going of millis, nanos is the same reason that it works from a 16ms near a 1ms clock. Of course "works" here, there is good enough to make an estimate, not "bet your life on it. The precision of the estimate increases with the number of samples taken, in the same way to make higher resolution (nano) estimates that you will need lots of samples. I imagine that there are formulas to determine how many samples is necessary to calculate how much is "lots and lots", in accordance with the resolution of the clock, but these calculations are beyond my skills. I imagine something like tens of millions of samples if you want to try to get one nano second accuracy of a clock of millisecond resolution.
In regard to the application of this technique to the problem have described it. The important parts is that you can stamp the work to its entry in the system and wear this timestamp to the end of the book. Evaluate the delta between "now" and the starting point, using the system on which the work was produced, and then finally produce a sum of the total 'work time' somewhere to allow you to calculate the average. There should be no problem with the addition of intermediate layers as much as long as you can do the above.
Thank you
Mark
The Oracle coherence
Tags: Fusion Middleware
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