Hi Barry, In our version of the nested timers, we had the functions PetscAdminSend, PetscAdminRecv and PetscAdminReduce. So I was expecting to find them at the end of the file petsc-3.8.4/src/sys/logging/xmllogevent.c but apparently you (re)moved them? We basically used these functions to fill the transfer(GiB/s) and reductions/s columns of the log just like we use PetscLogFlops to fill the compute(Mflops) column for our registered events. How should I do this with the petsc version of the nested timers? Chris dr. ir. Christiaan Klaij | Senior Researcher | Research & Development MARIN | T +31 317 49 33 44 | mailto:[email protected] | http://www.marin.nl MARIN news: http://www.marin.nl/web/News/News-items/Application-of-potential-flow-method...