Hi again, I am using the function and when solving a system with 32 CPUs I get that
CPU 0 - max memory usage 10GB(this is mostly due to it reading the matrix from file(5GB file), constructing it and then assembling/distributing it) CPU 1-31 = max memory usage 675MB per CPU. The maximum amount of memory used per CPU is during solve. Total memory usage: 31GB The OS does not release the 10GB memory CPU 0 is occupying wich is a bit annoying and I can attest to that as when I do operations with CPU 0 as in reading another matrix, the memory usage that the OS is reporting is not increasing, it stays at 10GB even though I just read another matrix into the memory. So while the memory is definitely "freed", it is not released by CPU 0 and This seems to be an OS configuration thing I guess. So my problem is that I have no idea how much memory CPU 0 is actually using during the solve. Can you give a hint or advice on how I should calculate CPU 0 memory usage during solve? Would it be roughly 675MB as the other CPUs aswell? Would the total memory usage during solve actually be closer to 22GB(32*675MB) rather than the 31GB(20GB+31*675MB) that I naively calculated? With best regards, Shaman Mahmoudi ----- Original Message ----- From: "Barry Smith" <[email protected]> To: <petsc-users at mcs.anl.gov> Sent: Monday, May 08, 2006 9:31 PM Subject: Re: PetscMemoryGetMaximumUsage > > Unfortunately that routine is not currently "wired"; getting actual > memory usage is not portable and is a pain. > > You can use PetscMallocGetMaximumUsage() to see the maximum amount > of memory PETSc has allocated at any one time (in all the PETSc objects). > > Barry > > > On Mon, 8 May 2006, Sh.M wrote: > > > Hi, > > > > If I want to check the maximum amount of memory PETSc has used during a > > program run, is PetscMemoryGetMaximumUsage the function to use? I take it a > > call to this function will print out how much Process ID X has used, is this > > correct? So If I want to see the total maximum amount of memory used during > > a program run, each process should call this function and then I add them to > > get the total amount, correct? > > > > Thanks in advance. > > > > With best regards, Shaman Mahmoudi > > > > >
