On Sep 24 17:29, Saurabh T wrote: > > I have been trying to get perl to use 2GB of memory (this is on a 32 bit xp > machine with 4 GB total memory). As per > http://cygwin.com/cygwin-ug-net/setup-maxmem.html I tried > peflags --cygwin-heap=2048 /usr/bin/perl
This can't work. Regardless of your physical memory installed, the virtual memory is restricted to 2 Gigs per process, unless you use the methods described in http://msdn.microsoft.com/en-us/library/bb613473%28VS.85%29.aspx But even then, the virtual memory layout of a 32 bit process (image, stack, heap, DLL placement) is so that you won't get more than about 1 Gig of heap, even if you booted the system in /3GB mode. Have a look into /proc/$PID/maps, it's quite instructive. It's very simple with less: $ less /proc/self/maps > However this causes perl to not write to screen. > On further investigation, I found the magic number to be 1040: > > $ peflags --cygwin-heap=1039 /usr/bin/perl > /usr/bin/perl: initial Cygwin heap size: 1039 (0x40f) MB > > $ perl -e 'print "Hello\n";' > Hello > > $ peflags --cygwin-heap=1040 /usr/bin/perl > /usr/bin/perl: initial Cygwin heap size: 1040 (0x410) MB > > $ perl -e 'print "Hello\n";' > > $ > > In other words, anything 1040 and above, perl stops writing to screen. > I have the latest cygwin (1.7.16) and perl (5.14.2). > Any idea what might be wrong? Thank you. I can't reproduce this, even with --cygwin-heap=2048. While Cygwin tries to allocate such a heap, it will fallback to a smaller heap if that's not possible. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
