Bugs item #1338264, was opened at 2005-10-26 15:37
Message generated for change (Comment added) made by sin_avatar
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Category: Python Interpreter Core
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: sin (sin_avatar)
Assigned to: Nobody/Anonymous (nobody)
Summary: Memory keeping
Initial Comment:
I execute this code on python 2.4.2 (authentic copy from
console):
Python 2.4.2 (#1, Oct 26 2005, 14:45:33)
[GCC 2.95.4 20020320 [FreeBSD]] on freebsd4
Type "help", "copyright", "credits" or "license" for more
information.
>>> a = range(1,10000000)
>>> del a
before i type del - i run top and get (see console output
below):
16300 sin 2 0 162M 161M poll 0:02 35.76%
9.28% python2.4
after del (console below):
16300 sin 2 0 162M 161M poll 0:03 7.18%
6.05% python2.4
I tried gc too ... but python didn't free memory. I checked
this on windows - memory was freed, but interpreter with
0 defined variables "eat" about 75 Mb!. I think this is bug
in interpereter core.
some text from dmesg for you:
Copyright (c) 1992-2003 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991,
1992, 1993, 1994
The Regents of the University of California. All rights
reserved.
FreeBSD 4.8-RELEASE #0: Thu Apr 3 10:53:38 GMT
2003
[EMAIL PROTECTED]:/usr/obj/usr/src/sys/
GENERIC
Timecounter "i8254" frequency 1193182 Hz
CPU: Pentium III/Pentium III Xeon/Celeron (499.15-MHz
686-class CPU)
Origin = "GenuineIntel" Id = 0x673 Stepping = 3
Features=0x387f9ff<FPU,VME,DE,PSE,TSC,MSR,
PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,
PSE36,PN,MMX,FXSR,SSE>
real memory = 268369920 (262080K bytes)
avail memory = 255901696 (249904K bytes)
----------------------------------------------------------------------
>Comment By: sin (sin_avatar)
Date: 2005-10-31 14:06
Message:
Logged In: YES
user_id=1368129
One more time.
>>> a = [1 for i in xrange(10000000)]
>>> del a
This code clear - and this not raise "memory keeping"(!)
>>> a = [i for i in xrange(10000000)]
>>> del a
But this code take about 163 Mb on my freeBSD. I can't
udestood why you don't care about this?
P.S. somebody explain me phrase "a) not a bug (integer
freelists)"
----------------------------------------------------------------------
Comment By: Josiah Carlson (josiahcarlson)
Date: 2005-10-31 11:56
Message:
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Suggested close because and/or:
a) not a bug (integer freelists)
b) platform specific malloc/free behavior on the
list->ob_item member (some platforms will drop to 121M
allocated memory after the deletion)
c) OP didn't listen when it was suggested they use xrange()
instead of range()
----------------------------------------------------------------------
Comment By: sin (sin_avatar)
Date: 2005-10-31 11:15
Message:
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Certainly, i 'am not a C guru, but i uderstood - if interpreter
keep more than 100Mb, and not keep useful information - it's
suxx. Fore example if i use my script as a part Zope portal - it
would be awful. Certainly my script was just example - but if i
use mult-thread server wrote on python and create list in each
thread - i would take memory from system and i cannot give it
back.
----------------------------------------------------------------------
Comment By: Tim Peters (tim_one)
Date: 2005-10-28 01:38
Message:
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Space for integer objects in particular lives in an immortal
free list of unbounded size, so it's certain in the current
implementation that doing range(10000000) will hang on to
space for 10 million integers forever. If you don't want that,
don't do that ;-) Iterating over xrange(10000000) instead will
consume very little RAM.
----------------------------------------------------------------------
Comment By: Josiah Carlson (josiahcarlson)
Date: 2005-10-28 01:29
Message:
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>From what I understand, whether or not the Python runtime
"frees" memory (which can be freed) is generally dependant
on platform malloc() and free().
----------------------------------------------------------------------
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