You said: "the script in windows (along with some other pre and post processing) took about 25 seconds ..and on linux it took 135 seconds". Is this based off of the wall-clock? Or did you actually benchmark the code (use Benchmark;)? Wall-clock times are notorious for varying all over the map, depending on what else is running on the machine.

I had a 'Lead Programming Manager' once tell me that he'd "benchmarked some RPC code I wrote and it was giving him unacceptable response times" -- thirty seconds between the time he pressed the enter key and the time the browser got updated. After some investigation, I found the bug. It seems that there was a small error with his lap-top's DNS configuration. The first two DNS-servers in his authoritative list were non-existent, due to transposition errors, and the DNS time-out was set to 15 seconds. Once we fixed that, the response time he measured was sub-second. An actual benchmark gave 0.2 seconds from start to finish. (That was about his reaction time, pushing the start/stop timer button on his wrist-watch....)

When you start saying things about program timings, you have to be sure that you are really measuring the code's performance and not side-effects of the other things on the Machine.

----
I Go Back to Sleep, Now.

OGB

In reply to Re: why filling Hash seems slower on unixes than windows ? by Old_Gray_Bear
in thread why filling Hash seems slower on unixes than windows ? by vmpilgrim

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