aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--erts/doc/src/erlang.xml26
-rw-r--r--erts/emulator/beam/atom.names3
-rw-r--r--erts/emulator/beam/bif.c18
-rw-r--r--erts/emulator/beam/erl_alloc.types2
-rw-r--r--erts/emulator/beam/erl_bif_info.c11
-rw-r--r--erts/emulator/beam/erl_process.c252
-rw-r--r--erts/emulator/beam/erl_process.h14
-rw-r--r--erts/emulator/test/statistics_SUITE.erl98
-rw-r--r--erts/preloaded/ebin/erlang.beambin41136 -> 42416 bytes
-rw-r--r--erts/preloaded/src/erlang.erl34
10 files changed, 436 insertions, 22 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index a21021d864..fbe7b36163 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -4,7 +4,7 @@
<erlref>
<header>
<copyright>
- <year>1996</year><year>2011</year>
+ <year>1996</year><year>2012</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
@@ -4933,6 +4933,21 @@ true</pre>
threads in the Erlang run-time system and may therefore be greater
than the wall-clock time.</p>
</item>
+ <tag><marker id="statistics_scheduler_wall_time"><c>scheduler_wall_time</c></marker></tag>
+ <item>
+ <p>Returns
+ <c>[{Scheduler_Id, Scheduler_Worked_Time, Scheduler_Total_Time}]</c>, time lapses are since the
+ the system flag <seealso marker="#system_flag_scheduler_wall_time">scheduler_wall_time</seealso>
+ was set to true.
+ Returns <c>undefined</c> if the system flag <seealso marker="#system_flag_scheduler_wall_time">
+ scheduler_wall_time</seealso> is set to false.
+ </p>
+ <p>The list of scheduler information is unsorted and may come in different order
+ between calls. The time unit is undefined and may be changed and should only be used
+ to calculate relative utilization.
+ </p>
+ </item>
+
<tag><c>wall_clock</c></tag>
<item>
<p>Returns
@@ -5305,6 +5320,14 @@ true</pre>
flags.
</p>
</item>
+ <tag><marker id="system_flag_scheduler_wall_time"><c>erlang:system_flag(scheduler_wall_time, Boolean)</c></marker></tag>
+ <item>
+ <p>Turns on/off scheduler wall time measurements. </p>
+ <p>For more information see,
+ <seealso marker="#statistics_scheduler_wall_time">erlang:statistics(scheduler_wall_time)</seealso>.
+ </p>
+ </item>
+
<tag><marker id="system_flag_schedulers_online"><c>erlang:system_flag(schedulers_online, SchedulersOnline)</c></marker></tag>
<item>
<p>Sets the amount of schedulers online. Valid range is
@@ -5316,6 +5339,7 @@ true</pre>
<seealso marker="#system_info_schedulers_online">erlang:system_info(schedulers_online)</seealso>.
</p>
</item>
+
<tag><c>erlang:system_flag(trace_control_word, TCW)</c></tag>
<item>
<p>Sets the value of the node's trace control word to
diff --git a/erts/emulator/beam/atom.names b/erts/emulator/beam/atom.names
index 71454b3e57..7be40976f6 100644
--- a/erts/emulator/beam/atom.names
+++ b/erts/emulator/beam/atom.names
@@ -95,6 +95,7 @@ atom atom
atom atom_used
atom attributes
atom await_proc_exit
+atom await_sched_wall_time_modifications
atom awaiting_load
atom awaiting_unload
atom backtrace backtrace_depth
@@ -239,6 +240,7 @@ atom generational
atom get_seq_token
atom get_tcw
atom getenv
+atom gather_sched_wall_time_result
atom getting_linked
atom getting_unlinked
atom global
@@ -554,6 +556,7 @@ atom waiting
atom wall_clock
atom warning
atom warning_msg
+atom scheduler_wall_time
atom wordsize
atom write_concurrency
atom xor
diff --git a/erts/emulator/beam/bif.c b/erts/emulator/beam/bif.c
index 55f4798892..f8305944a4 100644
--- a/erts/emulator/beam/bif.c
+++ b/erts/emulator/beam/bif.c
@@ -43,6 +43,9 @@ static Export* set_cpu_topology_trap = NULL;
static Export* await_proc_exit_trap = NULL;
Export* erts_format_cpu_topology_trap = NULL;
+static Export *await_sched_wall_time_mod_trap;
+static erts_smp_atomic32_t sched_wall_time;
+
#define DECL_AM(S) Eterm AM_ ## S = am_atom_put(#S, sizeof(#S) - 1)
/*
@@ -4160,6 +4163,18 @@ BIF_RETTYPE system_flag_2(BIF_ALIST_2)
erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
BIF_RET(am_true);
+ } else if (BIF_ARG_1 == am_scheduler_wall_time) {
+ if (BIF_ARG_2 == am_true || BIF_ARG_2 == am_false) {
+ erts_aint32_t new = BIF_ARG_2 == am_true ? 1 : 0;
+ erts_aint32_t old = erts_smp_atomic32_xchg_nob(&sched_wall_time,
+ new);
+ Eterm ref = erts_sched_wall_time_request(BIF_P, 1, new);
+ ASSERT(is_value(ref));
+ BIF_TRAP2(await_sched_wall_time_mod_trap,
+ BIF_P,
+ ref,
+ old ? am_true : am_false);
+ }
} else if (ERTS_IS_ATOM_STR("scheduling_statistics", BIF_ARG_1)) {
int what;
if (ERTS_IS_ATOM_STR("disable", BIF_ARG_2))
@@ -4457,6 +4472,9 @@ void erts_init_bif(void)
am_format_cpu_topology,
1);
await_proc_exit_trap = erts_export_put(am_erlang,am_await_proc_exit,3);
+ await_sched_wall_time_mod_trap
+ = erts_export_put(am_erlang, am_await_sched_wall_time_modifications, 2);
+ erts_smp_atomic32_init_nob(&sched_wall_time, 0);
}
#ifdef HARDDEBUG
diff --git a/erts/emulator/beam/erl_alloc.types b/erts/emulator/beam/erl_alloc.types
index 962db8b831..90a6c0cbee 100644
--- a/erts/emulator/beam/erl_alloc.types
+++ b/erts/emulator/beam/erl_alloc.types
@@ -367,6 +367,7 @@ type EXPORT LONG_LIVED_LOW CODE export_entry
type MONITOR_SH STANDARD_LOW PROCESSES monitor_sh
type NLINK_SH STANDARD_LOW PROCESSES nlink_sh
type AINFO_REQ STANDARD_LOW SYSTEM alloc_info_request
+type SCHED_WTIME_REQ STANDARD_LOW SYSTEM sched_wall_time_request
+else # "fullword"
@@ -383,6 +384,7 @@ type EXPORT LONG_LIVED CODE export_entry
type MONITOR_SH FIXED_SIZE PROCESSES monitor_sh
type NLINK_SH FIXED_SIZE PROCESSES nlink_sh
type AINFO_REQ SHORT_LIVED SYSTEM alloc_info_request
+type SCHED_WTIME_REQ SHORT_LIVED SYSTEM sched_wall_time_request
+endif
diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c
index 5a806777fe..ebd475f73a 100644
--- a/erts/emulator/beam/erl_bif_info.c
+++ b/erts/emulator/beam/erl_bif_info.c
@@ -57,6 +57,8 @@
static Export* alloc_info_trap = NULL;
static Export* alloc_sizes_trap = NULL;
+static Export *gather_sched_wall_time_res_trap;
+
#define DECL_AM(S) Eterm AM_ ## S = am_atom_put(#S, sizeof(#S) - 1)
/* Keep erts_system_version as a global variable for easy access from a core */
@@ -3180,7 +3182,12 @@ BIF_RETTYPE statistics_1(BIF_ALIST_1)
Eterm res;
Eterm* hp;
- if (BIF_ARG_1 == am_context_switches) {
+ if (BIF_ARG_1 == am_scheduler_wall_time) {
+ res = erts_sched_wall_time_request(BIF_P, 0, 0);
+ if (is_non_value(res))
+ BIF_RET(am_undefined);
+ BIF_TRAP1(gather_sched_wall_time_res_trap, BIF_P, res);
+ } else if (BIF_ARG_1 == am_context_switches) {
Eterm cs = erts_make_integer(erts_get_total_context_switches(), BIF_P);
hp = HAlloc(BIF_P, 3);
res = TUPLE2(hp, cs, SMALL_ZERO);
@@ -4160,6 +4167,8 @@ erts_bif_info_init(void)
alloc_info_trap = erts_export_put(am_erlang, am_alloc_info, 1);
alloc_sizes_trap = erts_export_put(am_erlang, am_alloc_sizes, 1);
+ gather_sched_wall_time_res_trap
+ = erts_export_put(am_erlang, am_gather_sched_wall_time_result, 1);
process_info_init();
os_info_init();
}
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index 5469a59d8c..30c91af630 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -537,6 +537,209 @@ erts_late_init_process(void)
}
+static void
+init_sched_wall_time(ErtsSchedWallTime *swtp)
+{
+ swtp->enabled = 0;
+ swtp->start = 0;
+ swtp->working.total = 0;
+ swtp->working.start = 0;
+ swtp->working.currently = 0;
+}
+
+static ERTS_INLINE Uint64
+sched_wall_time_ts(void)
+{
+#ifdef HAVE_GETHRTIME
+ return (Uint64) sys_gethrtime();
+#else
+ Uint64 res;
+ SysTimeval tv;
+ sys_gettimeofday(&tv);
+ res = (Uint64) tv.tv_sec*1000000;
+ res += (Uint64) tv.tv_usec;
+ return res;
+#endif
+}
+
+static ERTS_INLINE void
+sched_wall_time_change(ErtsSchedulerData *esdp, int working)
+{
+ if (esdp->sched_wall_time.enabled) {
+ Uint64 ts = sched_wall_time_ts();
+ if (working) {
+#ifdef DEBUG
+ ASSERT(!esdp->sched_wall_time.working.currently);
+ esdp->sched_wall_time.working.currently = 1;
+#endif
+ ts -= esdp->sched_wall_time.start;
+ esdp->sched_wall_time.working.start = ts;
+ }
+ else {
+#ifdef DEBUG
+ ASSERT(esdp->sched_wall_time.working.currently);
+ esdp->sched_wall_time.working.currently = 0;
+#endif
+ ts -= esdp->sched_wall_time.start;
+ ts -= esdp->sched_wall_time.working.start;
+ esdp->sched_wall_time.working.total += ts;
+ }
+ }
+}
+
+typedef struct {
+ int set;
+ int enable;
+ Process *proc;
+ Eterm ref;
+ Eterm ref_heap[REF_THING_SIZE];
+ Uint req_sched;
+ erts_smp_atomic32_t refc;
+} ErtsSchedWallTimeReq;
+
+#if !HALFWORD_HEAP
+ERTS_SCHED_PREF_QUICK_ALLOC_IMPL(swtreq,
+ ErtsSchedWallTimeReq,
+ 5,
+ ERTS_ALC_T_SCHED_WTIME_REQ)
+#else
+static ERTS_INLINE ErtsSchedWallTimeReq *
+swtreq_alloc(void)
+{
+ return erts_alloc(ERTS_ALC_T_SCHED_WTIME_REQ,
+ sizeof(ErtsSchedWallTimeReq));
+}
+
+static ERTS_INLINE void
+swtreq_free(ErtsSchedWallTimeReq *ptr)
+{
+ erts_free(ERTS_ALC_T_SCHED_WTIME_REQ, ptr);
+}
+#endif
+
+static void
+reply_sched_wall_time(void *vswtrp)
+{
+ Uint64 working = 0, total = 0;
+ ErtsSchedulerData *esdp = erts_get_scheduler_data();
+ ErtsSchedWallTimeReq *swtrp = (ErtsSchedWallTimeReq *) vswtrp;
+ ErtsProcLocks rp_locks = (swtrp->req_sched == esdp->no
+ ? ERTS_PROC_LOCK_MAIN
+ : 0);
+ Process *rp = swtrp->proc;
+ Eterm ref_copy = NIL, msg;
+ Eterm *hp = NULL;
+ Eterm **hpp;
+ Uint sz, *szp;
+ ErlOffHeap *ohp = NULL;
+ ErlHeapFragment *bp = NULL;
+
+ ASSERT(esdp);
+
+ if (swtrp->set) {
+ if (!swtrp->enable && esdp->sched_wall_time.enabled)
+ esdp->sched_wall_time.enabled = 0;
+ else if (swtrp->enable && !esdp->sched_wall_time.enabled) {
+ Uint64 ts = sched_wall_time_ts();
+ esdp->sched_wall_time.enabled = 1;
+ esdp->sched_wall_time.start = ts;
+ esdp->sched_wall_time.working.total = 0;
+ esdp->sched_wall_time.working.start = 0;
+ esdp->sched_wall_time.working.currently = 1;
+ }
+ }
+
+ if (esdp->sched_wall_time.enabled) {
+ Uint64 ts = sched_wall_time_ts();
+ ASSERT(esdp->sched_wall_time.working.currently);
+ ts -= esdp->sched_wall_time.start;
+ total = ts;
+ ts -= esdp->sched_wall_time.working.start;
+ working = esdp->sched_wall_time.working.total + ts;
+ }
+
+ sz = 0;
+ hpp = NULL;
+ szp = &sz;
+
+ while (1) {
+ if (hpp)
+ ref_copy = STORE_NC(hpp, ohp, swtrp->ref);
+ else
+ *szp += REF_THING_SIZE;
+
+ if (swtrp->set)
+ msg = ref_copy;
+ else {
+ msg = (!esdp->sched_wall_time.enabled
+ ? am_notsup
+ : erts_bld_tuple(hpp, szp, 3,
+ make_small(esdp->no),
+ erts_bld_uint64(hpp, szp, working),
+ erts_bld_uint64(hpp, szp, total)));
+
+ msg = erts_bld_tuple(hpp, szp, 2, ref_copy, msg);
+ }
+ if (hpp)
+ break;
+
+ hp = erts_alloc_message_heap(sz, &bp, &ohp, rp, &rp_locks);
+ szp = NULL;
+ hpp = &hp;
+ }
+
+ erts_queue_message(rp, &rp_locks, bp, msg, NIL);
+
+ if (swtrp->req_sched == esdp->no)
+ rp_locks &= ~ERTS_PROC_LOCK_MAIN;
+
+ if (rp_locks)
+ erts_smp_proc_unlock(rp, rp_locks);
+
+ erts_smp_proc_dec_refc(rp);
+
+ if (erts_smp_atomic32_dec_read_nob(&swtrp->refc) == 0)
+ swtreq_free(vswtrp);
+}
+
+Eterm
+erts_sched_wall_time_request(Process *c_p, int set, int enable)
+{
+ ErtsSchedulerData *esdp = ERTS_PROC_GET_SCHDATA(c_p);
+ Eterm ref;
+ ErtsSchedWallTimeReq *swtrp;
+ Eterm *hp;
+
+ if (!set && !esdp->sched_wall_time.enabled)
+ return THE_NON_VALUE;
+
+ swtrp = swtreq_alloc();
+ ref = erts_make_ref(c_p);
+ hp = &swtrp->ref_heap[0];
+
+ swtrp->set = set;
+ swtrp->enable = enable;
+ swtrp->proc = c_p;
+ swtrp->ref = STORE_NC(&hp, NULL, ref);
+ swtrp->req_sched = esdp->no;
+ erts_smp_atomic32_init_nob(&swtrp->refc,
+ (erts_aint32_t) erts_no_schedulers);
+
+ erts_smp_proc_add_refc(c_p, (Sint32) erts_no_schedulers);
+
+#ifdef ERTS_SMP
+ if (erts_no_schedulers > 1)
+ erts_schedule_multi_misc_aux_work(1,
+ erts_no_schedulers,
+ reply_sched_wall_time,
+ (void *) swtrp);
+#endif
+
+ reply_sched_wall_time((void *) swtrp);
+
+ return ref;
+}
+
static ERTS_INLINE ErtsProcList *
proclist_create(Process *p)
{
@@ -1707,6 +1910,7 @@ aux_thread(void *unused)
static void
scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
{
+ int working = 1;
ErtsSchedulerSleepInfo *ssi = esdp->ssi;
int spincount;
erts_aint32_t aux_work = 0;
@@ -1737,12 +1941,17 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
tse_wait:
+ if (thr_prgr_active != working)
+ sched_wall_time_change(esdp, thr_prgr_active);
+
while (1) {
aux_work = erts_atomic32_read_acqb(&ssi->aux_work);
if (aux_work) {
- if (!thr_prgr_active)
+ if (!thr_prgr_active) {
erts_thr_progress_active(esdp, thr_prgr_active = 1);
+ sched_wall_time_change(esdp, 1);
+ }
aux_work = handle_aux_work(&esdp->aux_work_data, aux_work);
if (aux_work && erts_thr_progress_update(esdp))
erts_thr_progress_leader_update(esdp);
@@ -1751,8 +1960,10 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
if (aux_work)
flgs = erts_smp_atomic32_read_acqb(&ssi->flags);
else {
- if (thr_prgr_active)
+ if (thr_prgr_active) {
erts_thr_progress_active(esdp, thr_prgr_active = 0);
+ sched_wall_time_change(esdp, 0);
+ }
erts_thr_progress_prepare_wait(esdp);
flgs = sched_spin_wait(ssi, spincount);
@@ -1789,8 +2000,10 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
if (flgs & ~ERTS_SSI_FLG_SUSPENDED)
erts_smp_atomic32_read_band_nob(&ssi->flags, ERTS_SSI_FLG_SUSPENDED);
- if (!thr_prgr_active)
+ if (!thr_prgr_active) {
erts_thr_progress_active(esdp, thr_prgr_active = 1);
+ sched_wall_time_change(esdp, 1);
+ }
erts_smp_runq_lock(rq);
sched_active(esdp->no, rq);
@@ -1806,14 +2019,21 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
sched_waiting_sys(esdp->no, rq);
+
erts_smp_runq_unlock(rq);
+ ASSERT(working);
+ sched_wall_time_change(esdp, working = 0);
+
spincount = ERTS_SCHED_SYS_SLEEP_SPINCOUNT;
while (spincount-- > 0) {
sys_poll_aux_work:
+ if (working)
+ sched_wall_time_change(esdp, working = 0);
+
ASSERT(!erts_port_task_have_outstanding_io_tasks());
erl_sys_schedule(1); /* Might give us something to do */
@@ -1828,6 +2048,8 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
aux_work = erts_atomic32_read_acqb(&ssi->aux_work);
if (aux_work) {
+ if (!working)
+ sched_wall_time_change(esdp, working = 1);
#ifdef ERTS_SMP
if (!thr_prgr_active)
erts_thr_progress_active(esdp, thr_prgr_active = 1);
@@ -1920,6 +2142,9 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
erts_smp_runq_unlock(rq);
+ if (working)
+ sched_wall_time_change(esdp, working = 0);
+
#ifdef ERTS_SMP
if (thr_prgr_active)
erts_thr_progress_active(esdp, thr_prgr_active = 0);
@@ -1955,6 +2180,8 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
if (flgs & ~ERTS_SSI_FLG_SUSPENDED)
erts_smp_atomic32_read_band_nob(&ssi->flags, ERTS_SSI_FLG_SUSPENDED);
#endif
+ if (!working)
+ sched_wall_time_change(esdp, working = 1);
sched_active_sys(esdp->no, rq);
}
@@ -3430,9 +3657,14 @@ erts_init_scheduling(int no_schedulers, int no_schedulers_online)
esdp->run_queue->scheduler = esdp;
init_aux_work_data(&esdp->aux_work_data, esdp);
+ init_sched_wall_time(&esdp->sched_wall_time);
}
init_misc_aux_work();
+#if !HALFWORD_HEAP
+ init_swtreq_alloc();
+#endif
+
#ifdef ERTS_SMP
@@ -3755,6 +3987,8 @@ suspend_scheduler(ErtsSchedulerData *esdp)
if (erts_system_profile_flags.scheduler)
profile_scheduler(make_small(esdp->no), am_inactive);
+ sched_wall_time_change(esdp, 0);
+
erts_smp_mtx_lock(&schdlr_sspnd.mtx);
flgs = sched_prep_spin_suspended(ssi, ERTS_SSI_FLG_SUSPENDED);
@@ -3813,16 +4047,20 @@ suspend_scheduler(ErtsSchedulerData *esdp)
aux_work = erts_atomic32_read_acqb(&ssi->aux_work);
if (aux_work) {
- if (!thr_prgr_active)
+ if (!thr_prgr_active) {
erts_thr_progress_active(esdp, thr_prgr_active = 1);
+ sched_wall_time_change(esdp, 1);
+ }
aux_work = handle_aux_work(&esdp->aux_work_data, aux_work);
if (aux_work && erts_thr_progress_update(esdp))
erts_thr_progress_leader_update(esdp);
}
if (!aux_work) {
- if (thr_prgr_active)
+ if (thr_prgr_active) {
erts_thr_progress_active(esdp, thr_prgr_active = 0);
+ sched_wall_time_change(esdp, 0);
+ }
erts_thr_progress_prepare_wait(esdp);
flgs = sched_spin_suspended(ssi,
ERTS_SCHED_SUSPEND_SLEEP_SPINCOUNT);
@@ -3877,8 +4115,10 @@ suspend_scheduler(ErtsSchedulerData *esdp)
if (erts_system_profile_flags.scheduler)
profile_scheduler(make_small(esdp->no), am_active);
- if (!thr_prgr_active)
+ if (!thr_prgr_active) {
erts_thr_progress_active(esdp, thr_prgr_active = 1);
+ sched_wall_time_change(esdp, 1);
+ }
erts_smp_runq_lock(esdp->run_queue);
non_empty_runq(esdp->run_queue);
diff --git a/erts/emulator/beam/erl_process.h b/erts/emulator/beam/erl_process.h
index a51b380bb0..173b7df69d 100644
--- a/erts/emulator/beam/erl_process.h
+++ b/erts/emulator/beam/erl_process.h
@@ -394,6 +394,16 @@ do { \
} while (0)
typedef struct {
+ int enabled;
+ Uint64 start;
+ struct {
+ Uint64 total;
+ Uint64 start;
+ int currently;
+ } working;
+} ErtsSchedWallTime;
+
+typedef struct {
int sched_id;
ErtsSchedulerData *esdp;
ErtsSchedulerSleepInfo *ssi;
@@ -457,6 +467,8 @@ struct ErtsSchedulerData_ {
ErtsSchedAllocData alloc_data;
+ ErtsSchedWallTime sched_wall_time;
+
#ifdef ERTS_DO_VERIFY_UNUSED_TEMP_ALLOC
erts_alloc_verify_func_t verify_unused_temp_alloc;
Allctr_t *verify_unused_temp_alloc_data;
@@ -1064,6 +1076,8 @@ void erts_late_init_process(void);
void erts_early_init_scheduling(int);
void erts_init_scheduling(int, int);
+Eterm erts_sched_wall_time_request(Process *c_p, int set, int enable);
+
ErtsProcList *erts_proclist_create(Process *);
void erts_proclist_destroy(ErtsProcList *);
int erts_proclist_same(ErtsProcList *, Process *);
diff --git a/erts/emulator/test/statistics_SUITE.erl b/erts/emulator/test/statistics_SUITE.erl
index 0392312a6f..a93dd309c1 100644
--- a/erts/emulator/test/statistics_SUITE.erl
+++ b/erts/emulator/test/statistics_SUITE.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1997-2011. All Rights Reserved.
+%% Copyright Ericsson AB 1997-2012. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -29,6 +29,7 @@
runtime_zero_diff/1,
runtime_update/1, runtime_diff/1,
run_queue_one/1,
+ scheduler_wall_time/1,
reductions/1, reductions_big/1, garbage_collection/1, io/1,
badarg/1]).
@@ -51,8 +52,8 @@ suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[{group, wall_clock}, {group, runtime}, reductions,
- reductions_big, {group, run_queue}, garbage_collection,
- io, badarg].
+ reductions_big, {group, run_queue}, scheduler_wall_time,
+ garbage_collection, io, badarg].
groups() ->
[{wall_clock, [],
@@ -266,11 +267,10 @@ run_queue_one(Config) when is_list(Config) ->
run_queue_one_test(Config) when is_list(Config) ->
- ?line Hog = spawn_link(?MODULE, hog, [self()]),
+ ?line _Hog = spawn_link(?MODULE, hog, [self()]),
?line receive
- hog_started ->
- Hog ! go
- end,
+ hog_started -> ok
+ end,
?line receive after 100 -> ok end, % Give hog a head start.
?line case statistics(run_queue) of
N when N >= 1 -> ok;
@@ -280,18 +280,88 @@ run_queue_one_test(Config) when is_list(Config) ->
%% CPU-bound process, going at low priority. It will always be ready
%% to run.
-
+
hog(Pid) ->
?line process_flag(priority, low),
?line Pid ! hog_started,
- ?line receive
- go -> hog_iter(0)
+ ?line Mon = erlang:monitor(process, Pid),
+ ?line hog_iter(0, Mon).
+
+hog_iter(N, Mon) when N > 0 ->
+ receive
+ {'DOWN', Mon, _, _, _} -> ok
+ after 0 ->
+ ?line hog_iter(N-1, Mon)
+ end;
+hog_iter(0, Mon) ->
+ ?line hog_iter(10000, Mon).
+
+%%% Tests of statistics(scheduler_wall_time).
+
+scheduler_wall_time(doc) ->
+ "Tests that statistics(scheduler_wall_time) works as intended";
+scheduler_wall_time(Config) when is_list(Config) ->
+ %% Should return undefined if system_flag is not turned on yet
+ undefined = statistics(scheduler_wall_time),
+ %% Turn on statistics
+ false = erlang:system_flag(scheduler_wall_time, true),
+ try
+ Schedulers = erlang:system_info(schedulers_online),
+ %% Let testserver and everyone else finish their work
+ timer:sleep(500),
+ %% Empty load
+ EmptyLoad = get_load(),
+ {false, _} = {lists:any(fun(Load) -> Load > 50 end, EmptyLoad),EmptyLoad},
+ MeMySelfAndI = self(),
+ StartHog = fun() ->
+ Pid = spawn(?MODULE, hog, [self()]),
+ receive hog_started -> MeMySelfAndI ! go end,
+ Pid
+ end,
+ P1 = StartHog(),
+ %% Max on one, the other schedulers empty (hopefully)
+ %% Be generous the process can jump between schedulers
+ %% which is ok and we don't want the test to fail for wrong reasons
+ _L1 = [S1Load|EmptyScheds1] = get_load(),
+ {true,_} = {S1Load > 50,S1Load},
+ {false,_} = {lists:any(fun(Load) -> Load > 50 end, EmptyScheds1),EmptyScheds1},
+ {true,_} = {lists:sum(EmptyScheds1) < 60,EmptyScheds1},
+
+ %% 50% load
+ HalfHogs = [StartHog() || _ <- lists:seq(1, (Schedulers-1) div 2)],
+ HalfLoad = lists:sum(get_load()) div Schedulers,
+ if Schedulers < 2, HalfLoad > 80 -> ok; %% Ok only one scheduler online and one hog
+ %% We want roughly 50% load
+ HalfLoad > 40, HalfLoad < 60 -> ok;
+ true -> exit({halfload, HalfLoad})
+ end,
+
+ %% 100% load
+ LastHogs = [StartHog() || _ <- lists:seq(1, Schedulers div 2)],
+ FullScheds = get_load(),
+ {false,_} = {lists:any(fun(Load) -> Load < 80 end, FullScheds),FullScheds},
+ FullLoad = lists:sum(FullScheds) div Schedulers,
+ if FullLoad > 90 -> ok;
+ true -> exit({fullload, FullLoad})
+ end,
+
+ [exit(Pid, kill) || Pid <- [P1|HalfHogs++LastHogs]],
+ AfterLoad = get_load(),
+ {false,_} = {lists:any(fun(Load) -> Load > 5 end, AfterLoad),AfterLoad},
+ true = erlang:system_flag(scheduler_wall_time, false)
+ after
+ erlang:system_flag(scheduler_wall_time, false)
end.
-hog_iter(N) when N > 0 ->
- ?line hog_iter(N-1);
-hog_iter(0) ->
- ?line hog_iter(10000).
+get_load() ->
+ Start = erlang:statistics(scheduler_wall_time),
+ timer:sleep(500),
+ End = erlang:statistics(scheduler_wall_time),
+ lists:reverse(lists:sort(load_percentage(lists:sort(Start),lists:sort(End)))).
+
+load_percentage([{Id, WN, TN}|Ss], [{Id, WP, TP}|Ps]) ->
+ [100*(WN-WP) div (TN-TP)|load_percentage(Ss, Ps)];
+load_percentage([], []) -> [].
garbage_collection(doc) ->
diff --git a/erts/preloaded/ebin/erlang.beam b/erts/preloaded/ebin/erlang.beam
index 9e369d5348..b78747bc84 100644
--- a/erts/preloaded/ebin/erlang.beam
+++ b/erts/preloaded/ebin/erlang.beam
Binary files differ
diff --git a/erts/preloaded/src/erlang.erl b/erts/preloaded/src/erlang.erl
index 4affc9bffe..4cbff3f36e 100644
--- a/erts/preloaded/src/erlang.erl
+++ b/erts/preloaded/src/erlang.erl
@@ -43,6 +43,9 @@
-export([memory/0, memory/1]).
-export([alloc_info/1, alloc_sizes/1]).
+-export([gather_sched_wall_time_result/1,
+ await_sched_wall_time_modifications/2]).
+
-deprecated([hash/2]).
% Get rid of autoimports of spawn to avoid clashes with ourselves.
@@ -1202,3 +1205,34 @@ receive_allocator(Ref, N, Acc) ->
{Ref, _, InfoList} ->
receive_allocator(Ref, N-1, insert_info(InfoList, Acc))
end.
+
+-spec await_sched_wall_time_modifications(Ref, Result) -> boolean() when
+ Ref :: reference(),
+ Result :: boolean().
+
+await_sched_wall_time_modifications(Ref, Result) ->
+ sched_wall_time(Ref, erlang:system_info(schedulers)),
+ Result.
+
+-spec gather_sched_wall_time_result(Ref) -> [{pos_integer(),
+ non_neg_integer(),
+ non_neg_integer()}] when
+ Ref :: reference().
+
+gather_sched_wall_time_result(Ref) when is_reference(Ref) ->
+ sched_wall_time(Ref, erlang:system_info(schedulers), []).
+
+sched_wall_time(_Ref, 0) ->
+ ok;
+sched_wall_time(Ref, N) ->
+ receive Ref -> sched_wall_time(Ref, N-1) end.
+
+sched_wall_time(_Ref, 0, Acc) ->
+ Acc;
+sched_wall_time(Ref, N, undefined) ->
+ receive {Ref, _} -> sched_wall_time(Ref, N-1, undefined) end;
+sched_wall_time(Ref, N, Acc) ->
+ receive
+ {Ref, undefined} -> sched_wall_time(Ref, N-1, undefined);
+ {Ref, SWT} -> sched_wall_time(Ref, N-1, [SWT|Acc])
+ end.
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 10:08:53 +0000