Big loop problem of fortran

Wen Long

Hi, friends:

I'd like to get your advice on a mysterious problem. I have a code running ocean wave boundary layer simulation. And I'm running for 1-day realization, with time step about 0.1 sec, which I have about 864000 time steps to march in a big loop.

It runs okay on my linux PC but pretty slow. Then I turned to an SGI origion 300 with 4 CPU's in order to get results faster. Problem being it stops somewhere around 100,000 timesteps, without any error info.

I suspected it might be size of integer has a limit for loop index?

Please help me, thanks a lot

Wen