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>> Which is more important: time to write the program or time to run the program?

Or, the time to get your benchmarks correct?

Why is perl included in the tags ?

The comments has an additional Perl one. Regardless, this is a pretty barebones "test". Lies, damn lies and benchmarks and so forth.

Obviously time to write the program is the more important. In 18 months your application will run twice as fast without you having to do anything. Add to that the performance benefits you get if adopting a virtual machine (Jython or IronPython).

http://www.gotw.ca/publications/concurrency-ddj.htm

Oh man... I've seen so many benchmarks, but that's probably the worst. A small piece of code is repeated... what? A whopping 14 times?

And then some loop which increments some number and then prints it? WTF? The bottleneck there is... printing. D'uh. Completely pointless.