#include "petscsys.h" PetscErrorCode PetscInitialize(int *argc,char ***args,const char file[],const char help[])Collective on MPI_COMM_WORLD or PETSC_COMM_WORLD if it has been set
| argc | - count of number of command line arguments | |
| args | - the command line arguments | |
| file | - [optional] PETSc database file, also checks ~username/.petscrc and .petscrc use NULL to not check for code specific file. Use -skip_petscrc in the code specific file to skip the .petscrc files | |
| help | - [optional] Help message to print, use NULL for no message |
If you wish PETSc code to run ONLY on a subcommunicator of MPI_COMM_WORLD, create that communicator first and assign it to PETSC_COMM_WORLD BEFORE calling PetscInitialize(). Thus if you are running a four process job and two processes will run PETSc and have PetscInitialize() and PetscFinalize() and two process will not, then do this. If ALL processes in the job are using PetscInitialize() and PetscFinalize() then you don't need to do this, even if different subcommunicators of the job are doing different things with PETSc.
| -help [intro] | - prints help method for each option; if intro is given the program stops after printing the introductory help message | |
| -start_in_debugger [noxterm,dbx,xdb,gdb,...] | - Starts program in debugger | |
| -on_error_attach_debugger [noxterm,dbx,xdb,gdb,...] | - Starts debugger when error detected | |
| -on_error_emacs <machinename> causes emacsclient to jump to error file | - . -on_error_abort calls abort() when error detected (no traceback) | |
| -on_error_mpiabort calls MPI_abort() when error detected | - . -error_output_stderr prints error messages to stderr instead of the default stdout | |
| -error_output_none does not print the error messages (but handles errors in the same way as if this was not called) | - . -debugger_nodes [node1,node2,...] - Indicates nodes to start in debugger | |
| -debugger_pause [sleeptime] (in seconds) | - Pauses debugger | |
| -stop_for_debugger | - Print message on how to attach debugger manually to process and wait (-debugger_pause) seconds for attachment | |
| -malloc | - Indicates use of PETSc error-checking malloc (on by default for debug version of libraries) | |
| -malloc no | - Indicates not to use error-checking malloc | |
| -malloc_debug | - check for memory corruption at EVERY malloc or free | |
| -malloc_dump | - prints a list of all unfreed memory at the end of the run | |
| -malloc_test | - like -malloc_dump -malloc_debug, but only active for debugging builds | |
| -fp_trap | - Stops on floating point exceptions (Note that on the IBM RS6000 this slows code by at least a factor of 10.) | |
| -no_signal_handler | - Indicates not to trap error signals | |
| -shared_tmp | - indicates /tmp directory is shared by all processors | |
| -not_shared_tmp | - each processor has own /tmp | |
| -tmp | - alternative name of /tmp directory | |
| -get_total_flops | - returns total flops done by all processors | |
| -memory_view | - Print memory usage at end of run |
| -info <optional filename> | - Prints verbose information to the screen | |
| -info_exclude <null,vec,mat,pc,ksp,snes,ts> | - Excludes some of the verbose messages | |
| -log_sync | - Enable barrier synchronization for all events. This option is useful to debug imbalance within each event, however it slows things down and gives a distorted view of the overall runtime. | |
| -log_trace [filename] | - Print traces of all PETSc calls to the screen (useful to determine where a program hangs without running in the debugger). See PetscLogTraceBegin(). | |
| -log_view [:filename:format] | - Prints summary of flop and timing information to screen or file, see PetscLogView(). | |
| -log_summary [filename] | - (Deprecated, use -log_view) Prints summary of flop and timing information to screen. If the filename is specified the summary is written to the file. See PetscLogView(). | |
| -log_exclude: <vec,mat,pc,ksp,snes> | - excludes subset of object classes from logging | |
| -log_all [filename] | - Logs extensive profiling information See PetscLogDump(). | |
| -log [filename] | - Logs basic profiline information See PetscLogDump(). | |
| -log_mpe [filename] | - Creates a logfile viewable by the utility Jumpshot (in MPICH distribution) | |
| -viewfromoptions on,off | - Enable or disable XXXSetFromOptions() calls, for applications with many small solves turn this off | |
| -check_pointer_intensity 0,1,2 | - if pointers are checked for validity (debug version only), using 0 will result in faster code |
Only one of -log_trace, -log_view, -log_view, -log_all, -log, or -log_mpe may be used at a time
| -saws_port <portnumber> | - port number to publish SAWs data, default is 8080 | |
| -saws_port_auto_select | - have SAWs select a new unique port number where it publishes the data, the URL is printed to the screen this is useful when you are running many jobs that utilize SAWs at the same time | |
| -saws_log <filename> | - save a log of all SAWs communication | |
| -saws_https <certificate file> | - have SAWs use HTTPS instead of HTTP | |
| -saws_root <directory> | - allow SAWs to have access to the given directory to search for requested resources and files |
| PETSC_TMP | - alternative tmp directory | |
| PETSC_SHARED_TMP | - tmp is shared by all processes | |
| PETSC_NOT_SHARED_TMP | - each process has its own private tmp | |
| PETSC_VIEWER_SOCKET_PORT | - socket number to use for socket viewer | |
| PETSC_VIEWER_SOCKET_MACHINE | - machine to use for socket viewer to connect to |
call PetscInitialize(file,ierr)
| ierr | - error return code | |
| file | - [optional] PETSc database file, also checks ~username/.petscrc and .petscrc use PETSC_NULL_CHARACTER to not check for code specific file. Use -skip_petscrc in the code specific file to skip the .petscrc files |
If your main program is C but you call Fortran code that also uses PETSc you need to call PetscInitializeFortran() soon after calling PetscInitialize().