Can you send us a simplified code on what you've tried? What ts_type do you use?
Hong On Thu, 11 Sep 2008, tsjb00 wrote: > > Hi! > > I use TS object to solve a non-linear problem du/dt=f(u,t). I would like to > check the non-linear solver performance in TSStep. I tried to output the > residuals by setting a monitor. So far my attempt didn't work. Please let me > know if there are functions that calculate residuals of iterations in each TS > time step. If not, how can I output the solver iteration/residuals correctly > while using TS objects. > > Many thanks! > > P.S. The following are the code I tried: > > PetscViewerASCIIOpen(PETSC_COMM_WORLD,"snes.log",&rviewer); > ierr = TSGetSNES(ts,&ts_snes); > ierr = SNESMonitorSet(ts_snes,SNESMonitorDefault,&rviewer,PETSC_NULL); > > I did get residual output in snes.log, but the format was very weird. Each > line started with countless blank/space and at the very end was the SNES > iteration info. As a result, the file took a lot of memory space even with > one line of outputs. > > I also tried: > PetscViewerASCIIMonitorCreate(PETSC_COMM_WORLD,"snes.log",0,&rviewer); > ierr = TSGetSNES(ts,&ts_snes); > ierr = SNESMonitorSet(ts_snes,SNESMonitorDefault,&rviewer,PETSC_NULL); > which didn't work at all. > _________________________________________________________________ > ?????MSN?????????? > http://im.live.cn/click/ > >
