Re: [Jython-users] jython-2.1b1 startup time

[<bc...@wo...>]

[Jan Wender]

>I removed the cachedir and started each jython version two times, and there are
>large differences between the first and second startup and not so large between
>2.1a3 and 2.1b1.

Thanks. Now I'm convinced that the jar cache isn't the problem in your
case.

Then try something like this. Notice the -S option.

>jython-2.1a3-jdk13\jython -S -c "from time import time; t = time(); import site; print time() - t"
0.11000001430511475

>jython-2.1b1-jdk13\jython -S -c "from time import time; t = time(); import site; print time() - t"
0.44099998474121094

>jython-2.1a3-jdk13\jython -S -c "from time import time; t = time(); import re; print time() - t"
0.24000000953674316

>jython-2.1b1-jdk13\jython -S -c "from time import time; t = time(); import re; print time() - t"
0.25099992752075195

>jython-2.1a3-jdk13\jython -S -c "from time import time; t = time(); import os; os.sep; print time() - t"
0.04999995231628418

>jython-2.1b1-jdk13\jython -S -c "from time import time; t = time(); import os; os.sep; print time() - t"
0.3500000238418579

I use time.time() to do the timing, but that might only make sense for
win2k. Keep using the shell time command for *nix. Make sure you run
each command a couple of times to avoid disk cache artifacts.

The slowdown that I can measure is consistent with the use of "re" in
"os".


>Would it help if I tried different Java VMs? 

Let's stick with what we have for now.

>I hope this helps, I really want to find the cause of this slowdown.

Me too.

regards,
finn