Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com To: cygwin AT cygwin DOT com From: Mark Hadfield Subject: Re: Memory for large arrays in cygwin/g77 Date: Thu, 06 Jan 2005 13:57:34 +1300 Lines: 92 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: usenet AT sea DOT gmane DOT org X-Gmane-NNTP-Posting-Host: clam.niwa.cri.nz User-Agent: Mozilla Thunderbird 1.0 (Windows/20041206) In-Reply-To: X-IsSubscribed: yes Dante Chialvo wrote: > I have similar problem than the one posted a while ago in > > http://www.cygwin.com/ml/cygwin/2003-02/msg00842.html > > Using cygwin/g77, in a PC with 1024 Mb of physical memory. > After compiling and running the following test program > the limit of 160 Mb cannot be surpassed. > > implicit double precision (a-h,o-z) > c ny=200 works (160 Mb), > 200 doesnt (message error see beloww) > parameter(nx=100000,ny=300) > dimension a(nx,ny) > c dimension a1(nx,ny) > write(6,*) 'megabytes= ',nx*ny*8/1d6 > a(1,1)=1d0 > a(nx,ny)=1d0 > write(6,*) 'extremes initialized' > end > > error message after running > C:\cygwin\home\dchialvo\test.exe (1972): *** MapViewOfFileEx(0x71C, in_h > 0x71C) failed, Win32 error 6 > > I follow each one of the recomendation described here: > > http://sources.redhat.com/ml/cygwin/2003-02/msg00234.html > > setting the limit at 1024 Mb,etc, the registry shows that there > 1024 allocated however the problem persist, > no more than 160 mb can be allocated. > Just to provide another data point, I have the same problem. I have g77, g95 and grfortran (gfc) installed (see below). With heap_chunk_in_mb set to 1024, on a machine with 1024 MiB RAM< I can run a simple Fortran program with an array of up to ~ 1023 MiB. With g77 & gfc the limit is 156 MiB and beyond that it fails with something like gfctest.exe (844): *** MapViewOfFileEx(0x224, in_h 0x224) failed, Win32 error 6 Here is an example test program program main integer n parameter (n=40876200) real a(n) integer i do i=1,n a(i) = i end do write (unit=*, fmt=*) a(1), a(n) end And here is the -v output for each compiler: hadfield $ g77 -v Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/3.3.3/specs Configured with: /gcc/gcc-3.3.3-3/configure --verbose --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --enable-languages=c,ada,c++,d,f77,java,objc,pascal --enable-nls --without-included-gettext --enable-libgcj --with-system-zlib --enable-interpreter --enable-threads=posix --enable-java-gc=boehm --enable-sjlj-exceptions --disable-version-specific-runtime-libs --disable-win32-registry Thread model: posix gcc version 3.3.3 (cygwin special) hadfield $ gfc -v Reading specs from /usr/local/share/irun/bin/../lib/gcc/i686-pc-cygwin/4.0.0/specs Configured with: ../gcc-4.0-20041114/configure --prefix=/irun --enable-languages=f95 --with-gmp=/usr/local/gmp --with-mpfr=/usr/local/gmp Thread model: single gcc version 4.0.0 20041114 (experimental) hadfield $ g95 -v Using built-in specs. Configured with: ./configure --enable-languages=c --disable-nls Thread model: single gcc version 3.5.0 20040824 (experimental) (g95!) Dec 15 2004 > Any suggestions will be appreciatted Use g95 -- Mark Hadfield "Ka puwaha te tai nei, Hoea tatou" m DOT hadfield AT niwa DOT co DOT nz National Institute for Water and Atmospheric Research (NIWA) -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/