> a) Have you never found an error similar to this? What can I do? if the error is due to the system Windows XP, why does it not always happen? The error message indicates that the program ran out of memory. I suspect that if you decrease the number of nodes in the grid, the program will run on each of the machines. > b) Where can I found the maximum number of elements allowed by PHAST? PHAST is not optimized for memory and it uses a lot of memory. The amount of memory depends on the number of nodes and the complexity of the chemistry (number of elements, types of reactions included--equilibrium phases, surface, etc). The number of nodes and the presence or absence of kinetics are the major determinants of time of execution. You need to keep the problem size within the physical memory of the computer; you don't want the computer to have to swap to disk because the execution time will be prohibitive. Windows NT allows you to look at the amount of memory used in the Task Manager; there must be a way with other versions of Windows. With the chemistry defined, the size of the problem is basically proportional to the number of nodes. You can run problems with increasing numbers of nodes and look at the memory usage to estimate the maximum number of nodes for your problem. You may want to consider buying as much memory as you can for the computer; memory is relatively cheap. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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