diff options
| -rw-r--r-- | HOWTO/INSTALL.md | 4 | ||||
| -rw-r--r-- | erts/aclocal.m4 | 21 |
2 files changed, 16 insertions, 9 deletions
diff --git a/HOWTO/INSTALL.md b/HOWTO/INSTALL.md index 837e6cbd76..6434eda253 100644 --- a/HOWTO/INSTALL.md +++ b/HOWTO/INSTALL.md @@ -406,6 +406,10 @@ Some of the available `configure` options are: time source with elapsed time during suspend. * `--disable-prefer-elapsed-monotonic-time-during-suspend` - Do not prefer an OS monotonic time source with elapsed time during suspend. +* `--with-clock-resolution=high|low` - Try to find clock sources for OS system + time, and OS monotonic time with higher or lower resolution than chosen by + default. Note that both alternatives may have a negative impact on the performance + and scalability compared to the default clock sources chosen. * `--enable-dirty-schedulers` - Enable the **experimental** dirty schedulers functionality. Note that the dirty schedulers functionality is experimental, and **not supported**. This functionality **will** be subject to backward diff --git a/erts/aclocal.m4 b/erts/aclocal.m4 index 34e7376229..390d6cfc4d 100644 --- a/erts/aclocal.m4 +++ b/erts/aclocal.m4 @@ -940,16 +940,16 @@ AC_DEFUN(ERL_WALL_CLOCK, erl_wall_clock_low_resolution=no erl_wall_clock_id= - case $erl_cv_clock_gettime_wall_$1-$erl_cv_mach_clock_get_time_wall-$ac_cv_func_gettimeofday-$host_os in - *-*-*-win32) + case $1-$erl_cv_clock_gettime_wall_$1-$erl_cv_mach_clock_get_time_wall-$ac_cv_func_gettimeofday-$host_os in + *-*-*-*-win32) erl_wall_clock_func=WindowsAPI erl_wall_clock_low_resolution=yes ;; - no-yes-*-*) + high_resolution-no-yes-*-*) erl_wall_clock_func=mach_clock_get_time erl_wall_clock_id=CALENDAR_CLOCK ;; - CLOCK_*-*-*-*) + *-CLOCK_*-*-*-*) erl_wall_clock_func=clock_gettime erl_wall_clock_id=$erl_cv_clock_gettime_wall_$1 for low_res_id in $low_resolution_clock_gettime_wall; do @@ -959,7 +959,7 @@ AC_DEFUN(ERL_WALL_CLOCK, fi done ;; - no-no-yes-*) + *-no-*-yes-*) erl_wall_clock_func=gettimeofday ;; *) @@ -2219,10 +2219,10 @@ AS_HELP_STRING([--with-clock-gettime-monotonic-id=CLOCKID], [specify clock id to use with clock_gettime() for monotonic time)])) AC_ARG_ENABLE(prefer-elapsed-monotonic-time-during-suspend, - AS_HELP_STRING([--enable-prefer-elapsed-monotonic-time-during-suspend], - [Prefer an OS monotonic time source with elapsed time during suspend]) - AS_HELP_STRING([--disable-prefer-elapsed-monotonic-time-during-suspend], - [Do not prefer an OS monotonic time source with elapsed time during suspend]), +AS_HELP_STRING([--enable-prefer-elapsed-monotonic-time-during-suspend], + [Prefer an OS monotonic time source with elapsed time during suspend]) +AS_HELP_STRING([--disable-prefer-elapsed-monotonic-time-during-suspend], + [Do not prefer an OS monotonic time source with elapsed time during suspend]), [ case "$enableval" in yes) prefer_elapsed_monotonic_time_during_suspend=yes ;; *) prefer_elapsed_monotonic_time_during_suspend=no ;; @@ -2296,6 +2296,9 @@ case "$erl_wall_clock_func-$erl_wall_clock_id-$with_clock_gettime_realtime_id" i esac case $erl_wall_clock_func in + none) + AC_MSG_ERROR([No wall clock source found]) + ;; mach_clock_get_time) AC_DEFINE(OS_SYSTEM_TIME_USING_MACH_CLOCK_GET_TIME, [1], [Define if you want to implement erts_os_system_time() using mach clock_get_time()]) ;; |