Eehh, i mean 100*10*sizeof(double). matt
On Tuesday 29 September 2009, Matt Funk wrote: > 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/c7519b22/attachment.htm>
