We have a SGI Origin 2000 with 8 CPUs and 2G memory. When I parallize my code with Fortran 90, which came with the machine, I find that only part of the memory(512M) is used, although the 8 CPUs are working all the time. So when I calculate large 3-D problem with structured grid, the machine begins to use the swap, which makes the computation very slow. Does anybody have any experience to tell me how to use all the memory? Shound I change something in my code or the computer system?

Thanks,

Guoping Xia

You definitely can talk to the SGI people, unless it is a machine you put together.

Hi,

Sorry for my english.

Review the parallize code. The parallize programe from SGI don´t parallize all sentence. Sometimes is better to parallize only some loops and the other stand as in the original form. Read the parallize program and see which loop is necessary to parallize and which not.

Alberto

Try typing the command "limit". It will give you information on maximum "memoryuse." I suspect it will read 512MB. You then need to reconfigure the kernel, its not difficult to do, just check your administrator manuals.