Issue: import error on newest pypy on push (with hg-git resp. dulwich as extension)

Matt Mackall mpm at
Tue Jun 2 15:43:18 CDT 2015

On Tue, 2015-06-02 at 21:49 +0200, Sergey Brester wrote:
> 02.06.2015 21:20, wrote Matt Mackall:
> > On Tue, 2015-06-02 at 20:22 +0200, Sergey Brester wrote:
> > 
> >> Hi, I have found (and little bit researched) an annoying bug with 
> >> demandimport-module: Demand import error on newest pypy on push (with 
> >> hg-git resp. dulwich as extension).
> > 
> > Pypy = not supported. It's currently a good way to get a significantly
> > slower, less reliable Mercurial.
> > 
> Not supported - Ok.
> But "pypy = slower as python"? Ha-ha-ha. I can understand "reliable", 
> but slower... Don't believe and never will...

Well.. you could just try it. Mercurial is not a pure Python program. It
has a bunch of carefully optimized C extensions. If you use Pypy, it has
to use the pure Python version of this code.. which is not match for the
C code even after passing through Pypy. And it has to recompile /
optimize itself every time you run it, which means quick commands like
"status" are going to be dominated by start-up time.

Mercurial doesn't run on Pypy by accident. Various people including Pypy
developers have spent significant time getting it to run on Pypy and
discovered it wasn't useful for performance. What it's mostly useful for
is a benchmark of where Pypy could be better.

> >> Suggested workaround resp. fix with small test case can be found on 
> >> [1] [1]
> > 
> > No one's ever tried submitting a github pull request to hg before, so
> > bravo, sir, on your creative trollin'.
> Bravo, sir, such treatment to "contributor", even if it gone "wrong" for 
> the contribution, you will still lose the last other also.

Oh, you weren't doing it to be funny? My bad.

Mathematics is the supreme nostalgia of our time.

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