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authorLukas Larsson <[email protected]>2014-09-12 16:38:00 +0200
committerLukas Larsson <[email protected]>2016-02-02 10:45:21 +0100
commit664ed2a6fd2b324bb6b56db3d3eca853cfda8f61 (patch)
tree286743a4b1f794948329961e7f5879b5f54f54a5 /erts/emulator/beam/erl_threads.h
parenteea5f896780e07f7ca76685061d01e7be5a7abaa (diff)
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erts: Add microstate accounting
Microstate accounting is a way to track which state the different threads within ERTS are in. The main usage area is to pin point performance bottlenecks by checking which states the threads are in and then from there figuring out why and where to optimize. Since checking whether microstate accounting is on or off is relatively expensive if done in a short loop only a few of the states are enabled by default and more states can be enabled through configure. I've done some benchmarking and the overhead with it turned off is not noticible and with it on it is a fraction of a percent. If you enable the extra states, depending on the benchmark, the ovehead when turned off is about 1% and when turned on somewhere inbetween 5-15%. OTP-12345
Diffstat (limited to 'erts/emulator/beam/erl_threads.h')
-rw-r--r--erts/emulator/beam/erl_threads.h34
1 files changed, 27 insertions, 7 deletions
diff --git a/erts/emulator/beam/erl_threads.h b/erts/emulator/beam/erl_threads.h
index 34f91e2ec8..e689547d1d 100644
--- a/erts/emulator/beam/erl_threads.h
+++ b/erts/emulator/beam/erl_threads.h
@@ -2056,6 +2056,8 @@ erts_atomic64_read_dirty(erts_atomic64_t *var)
#endif /* !USE_THREADS */
+#include "erl_msacc.h"
+
#if ERTS_GLB_INLINE_INCL_FUNC_DEF
ERTS_GLB_INLINE void
@@ -2414,6 +2416,7 @@ erts_cnd_wait(erts_cnd_t *cnd, erts_mtx_t *mtx)
{
#ifdef USE_THREADS
int res;
+ ERTS_MSACC_PUSH_AND_SET_STATE(ERTS_MSACC_STATE_SLEEP);
#ifdef ERTS_ENABLE_LOCK_CHECK
erts_lc_unlock(&mtx->lc);
#endif
@@ -2432,6 +2435,7 @@ erts_cnd_wait(erts_cnd_t *cnd, erts_mtx_t *mtx)
#endif
if (res != 0 && res != EINTR)
erts_thr_fatal_error(res, "wait on condition variable");
+ ERTS_MSACC_POP_STATE();
#endif
}
@@ -3488,7 +3492,11 @@ ERTS_GLB_INLINE void erts_tse_reset(erts_tse_t *ep)
ERTS_GLB_INLINE int erts_tse_wait(erts_tse_t *ep)
{
#ifdef USE_THREADS
- return ethr_event_wait(&((ethr_ts_event *) ep)->event);
+ int res;
+ ERTS_MSACC_PUSH_AND_SET_STATE(ERTS_MSACC_STATE_SLEEP);
+ res = ethr_event_wait(&((ethr_ts_event *) ep)->event);
+ ERTS_MSACC_POP_STATE();
+ return res;
#else
return ENOTSUP;
#endif
@@ -3497,7 +3505,11 @@ ERTS_GLB_INLINE int erts_tse_wait(erts_tse_t *ep)
ERTS_GLB_INLINE int erts_tse_swait(erts_tse_t *ep, int spincount)
{
#ifdef USE_THREADS
- return ethr_event_swait(&((ethr_ts_event *) ep)->event, spincount);
+ int res;
+ ERTS_MSACC_PUSH_AND_SET_STATE(ERTS_MSACC_STATE_SLEEP);
+ res = ethr_event_swait(&((ethr_ts_event *) ep)->event, spincount);
+ ERTS_MSACC_POP_STATE();
+ return res;
#else
return ENOTSUP;
#endif
@@ -3506,8 +3518,12 @@ ERTS_GLB_INLINE int erts_tse_swait(erts_tse_t *ep, int spincount)
ERTS_GLB_INLINE int erts_tse_twait(erts_tse_t *ep, Sint64 tmo)
{
#ifdef USE_THREADS
- return ethr_event_twait(&((ethr_ts_event *) ep)->event,
- (ethr_sint64_t) tmo);
+ int res;
+ ERTS_MSACC_PUSH_AND_SET_STATE(ERTS_MSACC_STATE_SLEEP);
+ res = ethr_event_twait(&((ethr_ts_event *) ep)->event,
+ (ethr_sint64_t) tmo);
+ ERTS_MSACC_POP_STATE();
+ return res;
#else
return ENOTSUP;
#endif
@@ -3516,9 +3532,13 @@ ERTS_GLB_INLINE int erts_tse_twait(erts_tse_t *ep, Sint64 tmo)
ERTS_GLB_INLINE int erts_tse_stwait(erts_tse_t *ep, int spincount, Sint64 tmo)
{
#ifdef USE_THREADS
- return ethr_event_stwait(&((ethr_ts_event *) ep)->event,
- spincount,
- (ethr_sint64_t) tmo);
+ int res;
+ ERTS_MSACC_PUSH_AND_SET_STATE(ERTS_MSACC_STATE_SLEEP);
+ res = ethr_event_stwait(&((ethr_ts_event *) ep)->event,
+ spincount,
+ (ethr_sint64_t) tmo);
+ ERTS_MSACC_POP_STATE();
+ return res;
#else
return ENOTSUP;
#endif