[pypy-dev] memory leak in pypy

[Nathan Hurst]

Ok, I tracked it down.  For some reason pydev (eclipse) was randomly
choosing between pypy and python2.7 on each run (I discovered this
when watching what was happening in top).  This explains why it was so
flakey.  Sorry for the confusion.  I have no idea how I'm going to
debug this further. (OT: does anyone recommend a better IDE than
pydev+eclipse?)

njh

On Tue, Jul 30, 2013 at 11:01:30AM +0200, Maciej Fijalkowski wrote:
> This sounds odd. My PyPy does not leak memory in this example. Can you
> please double check?
> 
> On Tue, Jul 30, 2013 at 2:43 AM, Nathan Hurst <njh at njhurst.com> wrote:
> > I was playing with this simple function to compute uint/3.  It does
> > not (afaict) directly allocate any memory, but when run it rapidly
> > consumes all memory (32GB):
> >
> > def divu3(n):
> >     q = (n >> 2) + (n >> 4)  # q = n*0.0101 (approx).
> >     q = q + (q >> 4)  # q = n*0.01010101.
> >     q = q + (q >> 8)  # q = n*0.01010101.
> >     q = q + (q >> 16)  # q = n*0.01010101.
> >     r = n - q*3  # 0 <= r <= 15.
> >     return q + (11*r >> 5)  # Returning q + r/3.
> >
> >
> > for i in range(2**31):
> >     assert(divu3(i) == i/3)
> >
> >
> > Python 2.7.3 (daf1b0412bfbd0666c19d567e37b29e4a3be5734, Jul 12 2013, 19:10:57)
> > [PyPy 2.1.0-beta1 with GCC 4.7.2] on linux2
> >
> > is it being over eager to specialise?
> >
> > njh
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