Hi, i have another question regarding how petsc uses memory w.r.t caching in MatSetValues .
My code does the standard stuff: 1) i preallocate the memory 2) i insert the values via MatSetValues 3)i assemble it. Say, for example i declare a 100x100 matrix with 10 NZ entries per row. After 1), will the memory used for the matrix be 100^2*10*sizeof(double)? After 2), will the memory used be 100^2*10*sizeof(double) from the prealloc PLUS 100^2*10*sizeof(double) form the caching of values After 3), will the memory then be reduced back to 100^2*10*sizeof(double)? My concern is step 2). If it is using memory for prealloc and seperately for caching, then is there a way to flush the cached values to the preallocated slots? I tried finding stuff in the manual pages but i am not quite sure if i can or not. thanks matt -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20090929/ca30dded/attachment.htm>
