8.3 Problems running

After coNCePTuaL is configured, compiled, built, and installed, there is still the chance that coNCePTuaL-generated executables fail to run. This section addresses some common problems and presents their solutions.

As a quick tip, a very conservative way to run a coNCePTuaL program is with the NCPTL_NOFORK environment variable set to ‘1’, the NCPTL_CHECKPOINT environment variable set to ‘0’, and with --no-trap=1-63 on the command line. Such usage should work around some of the most common—and some of the hardest to diagnose—problems that may impact a coNCePTuaL program. Read the corresponding sections (Miscellaneous mysterious hangs or crashes; Extremely noisy measurements; and, Keeping programs from dying on a signal) for information about the drawbacks of each of the preceding settings.