> > > Odd, but it seems to work fine for me now. eg, I get a speedup of 6x on a > ~50K equation 3D systems (Q3 elements with 2 dof per vertex). > > > > Mark, is it such speedup wrt the CPU version of SUPERLU_DIST? Or just the > PETSc factorizations? >
I was not clear. THis is on SUMMIT. One CPU and one GPU. SUPERLU_DIST-GPU vs PETSc-CPU was about 6x faster. I have seen SUPERLU vs PETSc on the CPU on smaller problems and PETSc was a little faster. Note, SUMMIT has 7 cores per GPU so it would be reasonable to run SUPERLU_DIST-CPU on 7 cores, in which case the speedup would clearly be gone, but that is not how I run this app. > > >> I just updated the master branch with this fix. Will be absorbed in a >> future release. >> >> As for PRNTlevel>=2, perhaps check your cmake build script. It should be >> set to 0 for production build. >> >> > I don't see where that gets set. PRNTlevel does not seem to be in our > repo. I see it in 'MAKE_INC/make.cuda_gpu: -DDEBUGlevel=0 > -DPRNTlevel=1 -DPROFlevel=0', but I think it is set at >= 2. I have > manually disabled the print statements (~ 5 places). > > Thanks, > Mark > > >> Sherry >> >> >> On Sun, Apr 19, 2020 at 6:32 PM Mark Adams <mfad...@lbl.gov> wrote: >> >>> Also, we have PRNTlevel>=2 in SuperLU_dist. This is causing a lot of >>> output. It's not clear where that is set (it's a #define) >>> >>> On Sun, Apr 19, 2020 at 9:28 PM Mark Adams <mfad...@lbl.gov> wrote: >>> >>>> Sherry, I found the problem. >>>> >>>> I added this print statement to dDestroy_LU >>>> >>>> nb = CEILING(nsupers, grid->npcol); >>>> for (i = 0; i < nb; ++i) >>>> if ( Llu->Lrowind_bc_ptr[i] ) { >>>> >>>> * fprintf(stderr,"dDestroy_LU: GPU free Llu->Lnzval_bc_ptr[%d/%d] = >>>> %p, CPU free Llu->Lrowind_bc_ptr = >>>> %p\n",i,nb,Llu->Lnzval_bc_ptr[i],Llu->Lrowind_bc_ptr[i]);* >>>> SUPERLU_FREE (Llu->Lrowind_bc_ptr[i]); >>>> #ifdef GPU_ACC >>>> checkCuda(cudaFreeHost(Llu->Lnzval_bc_ptr[i])); >>>> #else >>>> SUPERLU_FREE (Llu->Lnzval_bc_ptr[i]); >>>> #endif >>>> } >>>> >>>> And I see: >>>> >>>> 1 SNES Function norm 1.245977692562e-04 >>>> >>>> *dDestroy_LU: GPU free Llu->Lnzval_bc_ptr[0/134] = 0x4ff9b000, CPU free >>>> Llu->Lrowind_bc_ptr = 0x4ff9a000*ex112d: cudahook.cc:762: CUresult >>>> host_free_callback(void*): Assertion `cacheNode != __null' failed. >>>> >>>> THis looks like Lnzval_bc_ptr is on the CPU so I removed the GPU_ACC >>>> stuff and it works now. >>>> >>>> I see this in distribution. Perhaps this a serial run bug? >>>> >>>> On Sun, Apr 19, 2020 at 5:58 PM Xiaoye S. Li <x...@lbl.gov> wrote: >>>> >>>>> Mark, >>>>> you should fork a branch of your own to do this. >>>>> >>>>> Sherry >>>>> >>>>> On Sun, Apr 19, 2020 at 2:54 PM Stefano Zampini < >>>>> stefano.zamp...@gmail.com> wrote: >>>>> >>>>>> First, commit your changes to the superlu_dist branch, then rerun >>>>>> configure with >>>>>> >>>>>> —download-superlu_dist-commit=HEAD >>>>>> >>>>>> >>>>>> > On Apr 20, 2020, at 12:50 AM, Mark Adams <mfad...@lbl.gov> wrote: >>>>>> > >>>>>> > I would like to modify SuperLU_dist but if I change the source and >>>>>> configure it says no need to reconfigure, use --force. I use --force and >>>>>> it >>>>>> seems to clobber my changes. Can I tell configure to use build but not >>>>>> download SuperLU? >>>>>> >>>>>> >