Performance statistics

Question

Let's be honest, most software products that are developed by developers have fairly modest performance requirements. For instance. Systems may serve 100 requests per second, if that.

But let's assume for a moment (or even dream) that you might be participating in the “next big thing” (whatever that means), and you wanted to introduce some sort of performance statistics log to help you when everything these users arrive.

Maintaining performance statistics, how would you approach this requirement? Perhaps you would use some general structure for this? Or roll your own decision? What would you record? How granular?

Or would you not even bother to put something in place and rather deal with this problem when it really became a problem?

It would be really interesting to hear your thoughts on this topic.

Answer 1

I just throw it away: write down the time of the request events. Also register the size of the sent packet. Download all event logs. Then play them back. Use counters, then make a time difference to get speed, and you can graphically display the result and observe the patterns. basically delta bytes per second is a good signaling.

Answer 2

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, - jrobin (java impl Round Robin Database).

perf4j (http://perf4j.codehaus.org/)