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GDB
GDB is the debugger of the GNU Project |
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The GNU debugger (GDB) can be used to inspect problems in programs. It allows to trace and alter the execution of running programs as well as to create and inspect coredumps.
Usage
The gdb debugger is available on HLRS systems without the need to load a module.
Obtaining coredumps of crashing programs
GDB can be used to obtain a coredump of a program crash. To do so start gdb with the program and its arguments
Then start program execution and run until it crashes. When the program crashed save a corefile of the crashed process via the generate-core-file command - optionally providing an output file name:
(gdb) generate-core-file [file]
Obtaining a backtrace of a crashing MPI program
To get a backtrace of a crashing program start it via gdb as follows:
HAWK/MPT special
To use gdb with MPT on HAWK one has to run with MPI_SHEPHERD=true and provide the absolute path to gdb: