Harshad Sahasrabudhe <[email protected]> writes: >> >> Is your intent to solve a problem that matters in a way that makes sense >> for a scientist or engineer > > > I want to see if we can speed up the time stepper for a large system using > GPUs. For large systems with sparse matrix of size 420,000^2, each time > step takes 341 sec on a single process and 180 seconds on 16 processes. So > the scaling isn't that good.
Surely you're familiar with this. http://www.mcs.anl.gov/petsc/documentation/faq.html#computers Is the poor scaling due to increased iteration count? What method are you using? > We also run out of memory with more number of processes. This sounds like a problem with your code (non-scalable data structure). Also, the GPU doesn't have more memory than the CPU. How long does it take to solve that system stand-alone using MAGMA, including the data transfers?
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