memory leak when performing the calculation CDF(I)^2

[sagetrac-ggrafendorfer]

Using sage 3.2 (compiled from sources) on a 32-bit Core Duo machine running Debian Etch,
when performing

georg@HILBERT:~/Daten/Sync/Phd/Code/sde$ sage
----------------------------------------------------------------------
| Sage Version 3.2, Release Date: 2008-11-20                         |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------

sage: v = [CDF(i)^2 for n in range(50000)]
sage: v = [CDF(i)^2 for n in range(50000)]
sage: v = [CDF(i)^2 for n in range(50000)]

memory consumption increases about 70Mb which each command (at least on my machine),
this does not happen if one writes

sage: v = [CDF(i^2.) for n in range(50000)]

, however, results are the same,

Georg

Component: basic arithmetic

Issue created by migration from https://trac.sagemath.org/ticket/4683

[sagetrac-mabshoff]

comment:1

Hi Georg,

this looks like a dupe of #4639.

Cheers,

Michael

[sagetrac-ggrafendorfer]

comment:2

A yes, probably, I'm sorry, did not look ...
Georg

[sagetrac-mabshoff]

comment:4

#4639 fixes the vast majority of the problem here, but:

sage: v = [CDF(i)^2 for n in range(50000)]
sage: get_memory_usage()
421.88671875
sage: v = [CDF(i)^2 for n in range(50000)]
sage: get_memory_usage()
422.140625
sage: v = [CDF(i)^2 for n in range(50000)]
sage: get_memory_usage()
422.15234375
sage: v = [CDF(i)^2 for n in range(50000)]
sage: get_memory_usage()
422.40625

So still some small leak to go. I will poke around post 3.2.2.

Cheers,

Michael

[aghitza]

comment:5

Hmmm:

----------------------------------------------------------------------
| Sage Version 4.0.1.alpha0, Release Date: 2009-05-31                |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
sage: v = [CDF(i)^2 for n in range(50000)]
sage: get_memory_usage()
134.1328125
sage: v = [CDF(i)^2 for n in range(50000)]
sage: get_memory_usage()
136.578125
sage: v = [CDF(i)^2 for n in range(50000)]
sage: get_memory_usage()
136.7734375
sage: v = [CDF(i)^2 for n in range(50000)]
sage: get_memory_usage()
136.7734375
sage: get_memory_usage()
136.7734375
sage: v = [CDF(i)^2 for n in range(50000)]
sage: get_memory_usage()
136.7734375

[wjp]

comment:6

I don't see any growth in memory usage anymore either. I guess we can safely close it.