Re: [Jython-users] Compilation unit size exploding in JVM

[Jeff M. <jef...@za...>]

Awesome thanks; when I had the issue, it was with fairly small .py modules,
but I was importing some of the DB modules as well.

I'll see if i can reproduce on the current trunk and get back to you;
thanks!

jeff

On Fri, Jan 13, 2017 at 2:57 AM, Stefan Richthofer <Ste...@gm...
> wrote:

> Jeff, is it issue #527524 (http://bugs.jython.org/issue527524) that you
> observed?
> In http://bugs.jython.org/issue2473 Jim mentions that "In general, 2.7.0
> does a better job with large methods than 2.5.x, due to collection literal
> splitting", so it surprises me that you observed things to have gone worse
> in 2.7.0.
>
> - If you observed some different issue, it would be good if you could
> specify what behavior "blows up" actually describes. Ideal would be to file
> an issue with steps to reproduce, if none exists yet.
>
> - If it is #527524, you can try the newest Jython 2.7.1 trunk-version.
> Provide a CPython 2.7 bytecode-file (.pyc) of the problematic module (e.g.
> by running 'python -m py_compile filename') in the same folder. (It is
> only needed in compilation phase; Jython will embed that bytecode into the
> resulting class-file for problematic methods, so if you precompile to
> class-files you won't have to distribute the pyc-file.)
>
> Best
>
> Stefan
>
>
> *Gesendet:* Donnerstag, 12. Januar 2017 um 21:01 Uhr
> *Von:* "Jeff Mitchell" <jef...@za...>
> *An:* jyt...@li...
> *Betreff:* [Jython-users] Compilation unit size exploding in JVM
> Was just reminded about an issue I had back in December; I don't have
> logfile evidence handy but may be able to generate some if needed.
>
> There seems to be an emitted unit sizing issue in 2.7 -- ie: python code
> that ran just fine in 2.5 sometimes blows up in 2.7 when the JVM tries to
> invoke it; the on the fly compilation may be dumping in too many tokens or
> something.
>
> The workaround I had at the time was to try a few earlier builds of 2.7 or
> just go back to 2.5 .. ie: the standard 2.7 from the website, vs the most
> recent from the source repo. IIRC, the more recent the release, the larger
> the space used, and the higher chance the JVM would reject it. 2.5 had no
> problems whatsoever.
>
> JVM being openjdk in this case on a linux VM.
>
> Without the logfiles on hand its hard to pull out the correct keywords
> here,but does this ring a bell with anyone?
>
> I seem to recall there was no easy JVM tweak to work around it short of
> recompiling the JVM (ugh), but I expected the issue may just take care of
> itself later, and it wasn't critical for me at the time.
>
> Anyone know if this is a known issue? resolved? or an ongoing concern?
>
> jeff
>
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