Hi, Matthew Thanks for the suggestion, just did another run and here are some detailed stack traces, maybe will provide some more insight: *** Process received signal *** Signal: Aborted (6) Signal code: (-6) /lib64/libpthread.so.0(+0xf5f0)[0x2b56c46dc5f0] [ 1] /lib64/libc.so.6(gsignal+0x37)[0x2b56c5486337] [ 2] /lib64/libc.so.6(abort+0x148)[0x2b56c5487a28] [ 3] /libpetsc.so.3.10(PetscTraceBackErrorHandler+0xc4)[0x2b56c1e6a2d4] [ 4] /libpetsc.so.3.10(PetscError+0x1b5)[0x2b56c1e69f65] [ 5] /libpetsc.so.3.10(PetscCommBuildTwoSidedFReq+0x19f0)[0x2b56c1e03cf0] [ 6] /libpetsc.so.3.10(+0x77db17)[0x2b56c2425b17] [ 7] /libpetsc.so.3.10(+0x77a164)[0x2b56c2422164] [ 8] /libpetsc.so.3.10(MatAssemblyBegin_MPIAIJ+0x36)[0x2b56c23912b6] [ 9] /libpetsc.so.3.10(MatAssemblyBegin+0xca)[0x2b56c1feccda]
By reconfiguring, you mean recompiling petsc with that option, correct? Thank you. Karl On Thu, Jun 11, 2020 at 10:56 AM Matthew Knepley <knep...@gmail.com> wrote: > On Thu, Jun 11, 2020 at 11:51 AM Karl Lin <karl.lin...@gmail.com> wrote: > >> Hi, there >> >> We have written a program using Petsc to solve large sparse matrix >> system. It has been working fine for a while. Recently we encountered a >> problem when the size of the sparse matrix is larger than 10TB. We used >> several hundred nodes and 2200 processes. The program always crashes during >> MatAssemblyBegin.Upon a closer look, there seems to be something unusual. >> We have a little memory check during loading the matrix to keep track of >> rss. The printout of rss in the log shows normal increase up to rank 2160, >> i.e., if we load in a portion of matrix that is 1GB, after MatSetValues for >> that portion, rss will increase roughly about that number. From rank 2161 >> onwards, the rss in every rank doesn't increase after matrix loaded. Then >> comes MatAssemblyBegin, the program crashed on rank 2160. >> >> Is there a upper limit on the number of processes Petsc can handle? or is >> there a upper limit in terms of the size of the matrix petsc can handle? >> Thank you very much for any info. >> > > It sounds like you overflowed int somewhere. We try and check for this, > but catching every place is hard. Try reconfiguring with > > --with-64-bit-indices > > Thanks, > > Matt > > >> Regards, >> >> Karl >> > > > -- > What most experimenters take for granted before they begin their > experiments is infinitely more interesting than any results to which their > experiments lead. > -- Norbert Wiener > > https://www.cse.buffalo.edu/~knepley/ > <http://www.cse.buffalo.edu/~knepley/> >
