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I don't know much about memory allocation in FORTRAN but I do know that a 32-bit program cannot usually access more than 2 GiB of RAM at once. Although a 19200x22800 array wouldn't reach that 2 GiB limit (1670 MiB), if you're using it at the same time as the 13081x21272 array, then together...

Never mind, I figured it out. I had to add my own "Platform" for x64 (I'm used to it being there automatically) in the Configuration Manager. I had to find and add some more library directories to get it to compile but it does work now. The x64 version of the program is a bit quicker and, for...

I've discovered that the reason for the slowness of my program in gfortran was due to heavy I/O. I've now removed an unneeded portion of code that was writing to a file hundreds of thousands of times and the speeds of g95 and gfortran are now very similar (g95 is still faster though). I've also...

Yeah I'm pretty sure the versions of both g95 and gfortran I have are 32-bit but g95 comes out faster every time. I've tried two different multi-threaded sections with gfortran so far, both slow the program down. I've yet to try co-arrays with g95 and I've also got a trial version of ifort to...

I don't know how useful this is for F77 but if I want to output a number I have without any leading spaces, I just do this: INTEGER :: MyInteger CHARACTER(LEN=7) :: MyString WRITE(MyString,'(i7.5)') MyInteger WRITE(6,*) 'MyInteger: ', TRIM(ADJUSTL(MyString)) Should work for real numbers too...

Thanks for the info. I tried splitting some matrix manipulation using the OpenMP and, although it seems to be splitting into worker threads correctly, it ends up being slower than the single-threaded version. I guess the time saved by splitting the manipulation into multiple threads doesn't...

Turned out all I needed to do to get gfortran to work in a batch file was restart the computer (couldn't do it before as I was waiting for other calculations to finish). I've used gfortran with the same settings as I've used with g95 (-O3 -ftree-vectorize -funroll-loops) and these are the...

The installer did finish eventually, not sure why it hanged at that point. Didn't help though, the PATH still isn't registered and if I do it manually, it still isn't recognised in a batch file.

Thanks for the link. I ran the installer but it seems to be stuck on this step: Extract: README.html Output folder: C:\Program Files (x86)\gfortran All the buttons are greyed out and I can't do anything except to End Task. It's been stuck there for 2 minutes so far...

That didn't work but adding C:\Program Files (x86)\MinGW\bin to my PATH variable lets me run it from the command prompt. However, it doesn't work when run from a batch file ("gfortran isn't a recognised command"), which I need. In fact, g95 isn't even working through a batch file now. :( Even...

The snapshot I currently have installed has "G95 (GCC 4.1.2 (g95 0.93!) Jun 16 2010)" but it has not installed gfortran with it. I tried to find gfortran by itself but couldn't - there doesn't seem to be any Windows builds available on the official releases site. Instead I just downloaded the...

Hi, I've been trying to optimise some FORTRAN code and I've managed to make it about 4 times quicker (largely due to the -O3 switch in g95). I've been trying to use the -march switch to possibly optimise further but nothing I set it equal to is recognised. This is my basic compile command: g95...