Perl在具有32 GB RAM的Snow Leopard Mac服务器上不能分配超过1.1 GB的内存 [英] Perl cannot allocate more than 1.1 GB on a Snow leopard Mac server with 32 GB RAM
问题描述
我有一台具有32GB RAM的Mac服务器(雪豹).当我尝试在Perl(v 5.10.0)中分配超过1.1GB的RAM时，出现内存不足错误.这是我使用的脚本:
I have a Mac server (snow leopard) with 32GB RAM. When I try to allocate more than 1.1GB RAM in Perl (v 5.10.0) I get an out of memory error. Here is the script that I used:
#!/usr/bin/env perl
# My snow leopard MAC server runs out of memory at >1.1 billion bytes. How
# can this be when I have 32 GB of memory installed? Allocating up to 4
# billion bytes works on a Dell Win7 12GB RAM machine.
# perl -v
# This is perl, v5.10.0 built for darwin-thread-multi-2level
# (with 2 registered patches, see perl -V for more detail)
use strict;
use warnings;
my $s;
print "Trying 1.1 GB...";
$s = "a" x 1100000000; # ok
print "OK\n\n";
print "Trying 1.2 GB...";
$s = '';
$s = "a" x 1200000000; # fails
print "..OK\n";
这是我得到的输出:
Trying 1.1 GB...OK
perl(96685) malloc: *** mmap(size=1200001024) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
Out of memory!
Trying 1.2 GB...
有任何想法为什么会发生这种情况?
Any ideas why this is happening?
UPDATE 13年11月14日下午4:42
UPDATE 4:42pm 11/14/13
根据肯特·弗雷德里克(Kent Fredric)(请参阅下面的2个帖子)，这是我的限制.虚拟内存默认为无限制
As per Kent Fredric (see 2 posts below), here are my ulimits. Virtual memory defaults to unlimited
$ ulimit -a | grep bytes
data seg size (kbytes, -d) unlimited
max locked memory (kbytes, -l) unlimited
max memory size (kbytes, -m) unlimited
pipe size (512 bytes, -p) 1
stack size (kbytes, -s) 8192
virtual memory (kbytes, -v) unlimited
$ perl -E 'my $x = "a" x 1200000000; print "ok\n"'
perl(23074) malloc: *** mmap(size=1200001024) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
Out of memory!
$ perl -E 'my $x = "a" x 1100000000; print "ok\n"'
ok
我尝试将虚拟内存设置为100亿，但无济于事.
I tried setting virtual memory to 10 billion but to no avail.
$ ulimit -v 10000000000 # 10 billion
$ perl -E 'my $x = "a" x 1200000000; print "ok\n"'
perl(24275) malloc: *** mmap(size=1200001024) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
Out of memory!
推荐答案
我想我明白了.当文档中另有说明时，我无法接受Apple交付了32位Perl.来自"man perl":
I think I figured it out. I could not accept that Apple shipped a 32-bit Perl when their documentation says otherwise. From 'man perl':
64-BIT SUPPORT
Version 5.10.0 supports 64-bit execution (which is on by default). Version 5.8.8
only supports 32-bit execution.
然后我想起了，我在Mac服务器上安装了Fink，它存在32位和64位问题，有点怪异.所以，我注释掉了
Then I remembered, I installed Fink on my Mac server and it being, er, finicky with 32 and 64 bit issues. So, I commented out
#test -r /sw/bin/init.sh && . /sw/bin/init.sh
来自我的.profile.现在，我至少可以在32 GB RAM服务器上分配14 GB RAM(是的！)
from my .profile. Now I can at least allocate 14 GB RAM (yeah!) on my 32 GB RAM server
$ perl -E 'my $x = "a" x 14000000000; print "ok\n"'
ok
我尝试了16GB，但是在我放弃之前它挂了5分钟.现在，一个介于32位和64位之间的perl -V之间的diff讲述了这个故事(但是为什么还是intsize=4?).
I tried 16GB but it hung for 5 minutes before I gave up. Now, a diff between perl -V for 32-bit and 64-bit tells the tale (but why still intsize=4?).
$ diff perlv.32 perlv.64
16c16
< intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
---
> intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
18c18
< ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
---
> ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
34,35c34,36
< PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP USE_ITHREADS
< USE_LARGE_FILES USE_PERLIO USE_REENTRANT_API
---
> PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP USE_64_BIT_ALL
> USE_64_BIT_INT USE_ITHREADS USE_LARGE_FILES
> USE_PERLIO USE_REENTRANT_API
谢谢大家的帮助，
保罗
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