diff options
| -rw-r--r-- | erts/aclocal.m4 | 8 | ||||
| -rw-r--r-- | erts/emulator/beam/erl_bif_trace.c | 4 | ||||
| -rw-r--r-- | erts/emulator/beam/erl_time_sup.c | 2 | ||||
| -rw-r--r-- | erts/emulator/beam/erl_trace.c | 14 | ||||
| -rw-r--r-- | erts/emulator/sys/unix/erl_unix_sys.h | 10 | ||||
| -rw-r--r-- | lib/tools/doc/src/fprof.xml | 10 |
6 files changed, 21 insertions, 27 deletions
diff --git a/erts/aclocal.m4 b/erts/aclocal.m4 index a4d09810bd..99b96eb5bc 100644 --- a/erts/aclocal.m4 +++ b/erts/aclocal.m4 @@ -2645,7 +2645,7 @@ case $erl_gethrvtime in dnl Check if clock_gettime (linux) is working dnl - AC_MSG_CHECKING([if clock_gettime can be used to get process CPU time]) + AC_MSG_CHECKING([if clock_gettime can be used to get thread CPU time]) save_libs=$LIBS LIBS="-lrt" AC_TRY_RUN([ @@ -2659,11 +2659,11 @@ case $erl_gethrvtime in int i; struct timespec tp; - if (clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &tp) < 0) + if (clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tp) < 0) exit(1); start = ((long long)tp.tv_sec * 1000000000LL) + (long long)tp.tv_nsec; for (i = 0; i < 100; i++) - clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &tp); + clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tp); stop = ((long long)tp.tv_sec * 1000000000LL) + (long long)tp.tv_nsec; if (start == 0) exit(4); @@ -2686,7 +2686,7 @@ case $erl_gethrvtime in case $erl_clock_gettime_cpu_time in yes) AC_DEFINE(HAVE_CLOCK_GETTIME_CPU_TIME,[], - [define if clock_gettime() works for getting process time]) + [define if clock_gettime() works for getting thread time]) LIBRT=-lrt ;; cross) diff --git a/erts/emulator/beam/erl_bif_trace.c b/erts/emulator/beam/erl_bif_trace.c index 1953f79d79..fd3400ab71 100644 --- a/erts/emulator/beam/erl_bif_trace.c +++ b/erts/emulator/beam/erl_bif_trace.c @@ -643,12 +643,12 @@ Eterm erts_internal_trace_3(BIF_ALIST_3) SysTimespec tp; int i; - if (sys_get_proc_cputime(start, tp) < 0) + if (sys_get_cputime(start, tp) < 0) goto error; start = ((SysCpuTime)tp.tv_sec * 1000000000LL) + (SysCpuTime)tp.tv_nsec; for (i = 0; i < 100; i++) - sys_get_proc_cputime(stop, tp); + sys_get_cputime(stop, tp); stop = ((SysCpuTime)tp.tv_sec * 1000000000LL) + (SysCpuTime)tp.tv_nsec; if (start == 0) goto error; diff --git a/erts/emulator/beam/erl_time_sup.c b/erts/emulator/beam/erl_time_sup.c index 4f91d9ad07..29c698e34f 100644 --- a/erts/emulator/beam/erl_time_sup.c +++ b/erts/emulator/beam/erl_time_sup.c @@ -1860,7 +1860,7 @@ void erts_get_now_cpu(Uint* megasec, Uint* sec, Uint* microsec) { SysCpuTime t; SysTimespec tp; - sys_get_proc_cputime(t, tp); + sys_get_cputime(t, tp); *microsec = (Uint)(tp.tv_nsec / 1000); t = (tp.tv_sec / 1000000); *megasec = (Uint)(t % 1000000); diff --git a/erts/emulator/beam/erl_trace.c b/erts/emulator/beam/erl_trace.c index 065a560b52..e9a413904b 100644 --- a/erts/emulator/beam/erl_trace.c +++ b/erts/emulator/beam/erl_trace.c @@ -625,20 +625,6 @@ erts_get_system_profile(void) { return profile; } - -#ifdef HAVE_ERTS_NOW_CPU -# define GET_NOW(m, s, u) \ -do { \ - if (erts_cpu_timestamp) \ - erts_get_now_cpu(m, s, u); \ - else \ - get_now(m, s, u); \ -} while (0) -#else -# define GET_NOW(m, s, u) do {get_now(m, s, u);} while (0) -#endif - - static void write_sys_msg_to_port(Eterm unused_to, Port* trace_port, diff --git a/erts/emulator/sys/unix/erl_unix_sys.h b/erts/emulator/sys/unix/erl_unix_sys.h index 10adf80875..5bfe5a8e2d 100644 --- a/erts/emulator/sys/unix/erl_unix_sys.h +++ b/erts/emulator/sys/unix/erl_unix_sys.h @@ -292,6 +292,8 @@ erts_sys_perf_counter() /* * Functions for measuring CPU time + * + * Note that gethrvtime is time per process and clock_gettime is per thread. */ #if (defined(HAVE_GETHRVTIME) || defined(HAVE_CLOCK_GETTIME_CPU_TIME)) @@ -300,15 +302,15 @@ typedef struct timespec SysTimespec; #if defined(HAVE_GETHRVTIME) #define sys_gethrvtime() gethrvtime() -#define sys_get_proc_cputime(t,tp) (t) = sys_gethrvtime(), \ - (tp).tv_sec = (time_t)((t)/1000000000LL), \ - (tp).tv_nsec = (long)((t)%1000000000LL) +#define sys_get_cputime(t,tp) (t) = sys_gethrvtime(), \ + (tp).tv_sec = (time_t)((t)/1000000000LL), \ + (tp).tv_nsec = (long)((t)%1000000000LL) int sys_start_hrvtime(void); int sys_stop_hrvtime(void); #elif defined(HAVE_CLOCK_GETTIME_CPU_TIME) #define sys_clock_gettime(cid,tp) clock_gettime((cid),&(tp)) -#define sys_get_proc_cputime(t,tp) sys_clock_gettime(CLOCK_PROCESS_CPUTIME_ID,(tp)) +#define sys_get_cputime(t,tp) sys_clock_gettime(CLOCK_THREAD_CPUTIME_ID,(tp)) #endif #endif diff --git a/lib/tools/doc/src/fprof.xml b/lib/tools/doc/src/fprof.xml index 4c9e48045e..72624bd33b 100644 --- a/lib/tools/doc/src/fprof.xml +++ b/lib/tools/doc/src/fprof.xml @@ -328,10 +328,16 @@ purposes. This option is only allowed with the <c>start</c> option.</item> <tag><c>cpu_time</c>| <c>{cpu_time, bool()}</c></tag> - <item>The options <c>cpu_time</c> or <c>{cpu_time, true></c> + <item>The options <c>cpu_time</c> or <c>{cpu_time, true}</c> makes the timestamps in the trace be in CPU time instead of wallclock time which is the default. This option is - only allowed with the <c>start</c> option.</item> + only allowed with the <c>start</c> option. + <warning><p>Getting correct values out of cpu_time can be difficult. + The best way to get correct values is to run using a single + scheduler and bind that scheduler to a specific CPU, + i.e. <c>erl +S 1 +sbt db</c>.</p> + </warning> + </item> <tag><c>{procs, PidSpec}</c>| <c>{procs, [PidSpec]}</c></tag> <item>Specifies which processes that shall be traced. If this option is not given, the calling process is |