BTW, perhaps you should do the same in TSGetKSP(). What do you think? 2008/9/17 Hong Zhang <[email protected]>:

TSGetSNES() must be called after TSSetType(), otherwise the nonlinear context 'snes' is being created. Attached please find updated ex7.c, which illustrates how to set uer-defined SNESMonitor().

This example is pushed to petsc-dev. I also added an error flag in petsc-dev to prevent calling of TSGetSNES() before TSSetType(). Thanks for reporting the problem!

Best,

Hong

On Fri, 12 Sep 2008, tsjb00 wrote:

...

Many thanks for your reply! The code I tried was very similar to the code in: ts/examples/tutorials/ex7.c except that I changed the r.h.s. function.

The code related to TS: ierr = TSCreate(PETSC_COMM_WORLD,&ts);CHKERRQ(ierr); ierr = TSSetProblemType(ts,TS_NONLINEAR);CHKERRQ(ierr); ierr = TSSetRHSFunction(ts,FormFunction,&appctx);CHKERRQ(ierr);

ierr = DAGetColoring(appctx.da,IS_COLORING_GLOBAL,&iscoloring);CHKERRQ(ierr); ierr = MatFDColoringCreate(J,iscoloring,&matfdcoloring);CHKERRQ(ierr); ierr = ISColoringDestroy(iscoloring);CHKERRQ(ierr); ierr = MatFDColoringSetFunction(matfdcoloring,(PetscErrorCode (*)(void))FormFunction,&appctx);CHKERRQ(ierr); ierr = MatFDColoringSetFromOptions(matfdcoloring);CHKERRQ(ierr); ierr = TSSetRHSJacobian(ts,J,J,TSDefaultComputeJacobianColor,matfdcoloring);CHKERRQ(ierr);

dt = appctx.dtmin; ierr = TSSetInitialTimeStep(ts,0.0,dt);CHKERRQ(ierr); ierr = TSSetType(ts,TS_BEULER);CHKERRQ(ierr);

Then I tried to add the snes monitor: PetscViewerASCIIOpen(PETSC_COMM_WORLD,"snes.log",&rviewer); ierr = TSGetSNES(ts,&ts_snes); ierr = SNESMonitorSet(ts_snes,SNESMonitorDefault,&rviewer,PETSC_NULL); I got the snes.log with long lines which started with countless blank/space and ended at the very end with the SNES iteration info. As a result, the file took a lot of memory space even with one line of outputs.

Please let me know if I did something wrong.

Have a nice weekend!

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