I recall that the base configure script used to emit the help associated with --enable-timer-type. It no longer does so, although the option is still present in src/mpl/configure. Do I have a reasonable expectation of seeing --help output for all options in the base configure, or am I expected to run --help against every configure in the tree? Thanks, Jeff jrhammon-mac01:git jrhammon$ ./configure --help | grep time runtime - error checking controllable at runtime through environment runtime - Runtime control of data collected runtime - Alias to "multiple" --enable-mutex-timing calculate the time spent waiting on mutexes speeds up one-time build sometimes confusing) to the casual installer User-defined run-time library search path. jrhammon-mac01:git jrhammon$ ./src/mpl/configure --help | grep time speeds up one-time build --enable-timer-type=name - Select the timer to use for MPI_Wtime and internal timestamps. gethrtime - Solaris timer (Solaris systems only) clock_gettime - Posix timer (where available) gettimeofday - Most Unix systems linux86_cycle - Linux x86; returns cycle counts, not time in seconds* gcc_ia64_cycle - IPF ar.itc timer* mach_absolute_time - Mach absolute time (alternative to clock_gettime device - The timer is provided by the device *Note that the cycle timers are intended to be used by User-defined run-time library search path. -- Jeff Hammond [email protected] http://jeffhammond.github.io/