Re: performance issues with for loop and imap/deque maxlen=0

Hi all,
I think I can improve the performance of imap significantly.
Would you take pull requests at https://github.com/jythontools/jython/blob/master/src/org/python/modules/itertools/imap.java ?
Or should one submit patches to the mercurial repository?
Thanks,
Albert

> On May 16, 2020, at 12:09 AM, Albert Cardona <[email protected]> wrote:
> 
> Hi all,
> 
> I am seeing severe performance problems when looping over sequences
> and invoking a single method on each element of the sequence, both
> with a for loop and with an imap + deque maxlen=0 strategy. The
> baseline is clojure, which is fully typed and compiled to bytecode.
> 
> The difference is staggering: 500x to 1000x (from about 1 second to 1
> millisecond).
> 
> Here is a script that can run in Fiji:
> 
> https://github.com/acardona/scripts/blob/dev/python/imagej/tests/test_looping_performance_imglib2_setOne.py
> 
> The script creates an ImgLib2 image of width=512, height=512, depth=5,
> of type unsigned byte, and then loops over all pixels to invoke the
> method "setOne" on each pixel (pixels are presented as wrapped by an
> UnsignedByteType object that offers the "setOne" method). There is an
> underlying byte[] array of size 512*512*5 to the image.
> 
> Why the enormous difference? Anything that can be done to mitigate this issue?
> 
> Thank you very much.
> 
> Albert

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