2 * Copyright (C) 2013 Stefan Sauer <ensonic@users.sf.net>
4 * gstrusage.c: tracing module that logs resource usage stats
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
23 * @short_description: log resource usage stats
25 * A tracing module that take rusage() snapshots and logs them.
33 #include "gstrusage.h"
35 #ifdef HAVE_SYS_RESOURCE_H
37 # define __USE_GNU /* RUSAGE_THREAD */
39 #include <sys/resource.h>
42 GST_DEBUG_CATEGORY_STATIC (gst_rusage_debug);
43 #define GST_CAT_DEFAULT gst_rusage_debug
45 G_LOCK_DEFINE (_proc);
48 GST_DEBUG_CATEGORY_INIT (gst_rusage_debug, "rusage", 0, "rusage tracer");
49 #define gst_rusage_tracer_parent_class parent_class
50 G_DEFINE_TYPE_WITH_CODE (GstRUsageTracer, gst_rusage_tracer, GST_TYPE_TRACER,
53 /* remember x measurements per self->window */
54 #define WINDOW_SUBDIV 100
56 /* number of cpus to scale cpu-usage in threads */
57 static glong num_cpus = 1;
59 static GstTracerRecord *tr_proc, *tr_thread;
63 /* time spend in this thread */
65 GstTraceValues *tvs_thread;
71 free_trace_value (gpointer data)
73 g_slice_free (GstTraceValue, data);
76 static GstTraceValues *
77 make_trace_values (GstClockTime window)
79 GstTraceValues *self = g_slice_new0 (GstTraceValues);
80 self->window = window;
81 g_queue_init (&self->values);
86 free_trace_values (GstTraceValues * self)
88 g_queue_free_full (&self->values, free_trace_value);
89 g_slice_free (GstTraceValues, self);
93 update_trace_value (GstTraceValues * self, GstClockTime nts,
94 GstClockTime nval, GstClockTime * dts, GstClockTime * dval)
98 GstClockTime window = self->window;
99 GQueue *q = &self->values;
100 GList *node = q->tail;
101 gboolean ret = FALSE;
104 /* search from the tail of the queue for a good GstTraceValue */
107 dt = GST_CLOCK_DIFF (lv->ts, nts);
111 node = g_list_previous (node);
116 /* calculate the windowed value */
118 *dval = GST_CLOCK_DIFF (lv->val, nval);
120 /* drop all older measurements */
121 while (q->tail != node) {
122 free_trace_value (g_queue_pop_tail (q));
130 /* don't push too many data items */
131 lv = q->head ? q->head->data : NULL;
132 if (!lv || (GST_CLOCK_DIFF (lv->ts, nts) > (window / WINDOW_SUBDIV))) {
133 /* push the new measurement */
134 lv = g_slice_new0 (GstTraceValue);
137 g_queue_push_head (q, lv);
144 free_thread_stats (gpointer data)
146 free_trace_values (((GstThreadStats *) data)->tvs_thread);
147 g_slice_free (GstThreadStats, data);
151 do_stats (GstTracer * obj, guint64 ts)
153 GstRUsageTracer *self = GST_RUSAGE_TRACER_CAST (obj);
154 GstThreadStats *stats;
155 gpointer thread_id = g_thread_self ();
156 guint avg_cpuload, cur_cpuload;
158 GstClockTime tproc = G_GUINT64_CONSTANT (0);
159 GstClockTime tthread = G_GUINT64_CONSTANT (0);
160 GstClockTime dts, dtproc;
162 #ifdef HAVE_CLOCK_GETTIME
166 if (!clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &now)) {
167 tproc = GST_TIMESPEC_TO_TIME (now);
169 GST_WARNING_OBJECT (obj,
170 "clock_gettime (CLOCK_PROCESS_CPUTIME_ID,...) failed: %s",
172 getrusage (RUSAGE_SELF, &ru);
174 GST_TIMEVAL_TO_TIME (ru.ru_utime) + GST_TIMEVAL_TO_TIME (ru.ru_stime);
177 /* cpu time per thread */
178 if (!clock_gettime (CLOCK_THREAD_CPUTIME_ID, &now)) {
179 tthread = GST_TIMESPEC_TO_TIME (now);
181 GST_WARNING_OBJECT (obj,
182 "clock_gettime (CLOCK_THREAD_CPUTIME_ID,...) failed: %s",
185 getrusage (RUSAGE_THREAD, &ru);
187 GST_TIMEVAL_TO_TIME (ru.ru_utime) + GST_TIMEVAL_TO_TIME (ru.ru_stime);
192 getrusage (RUSAGE_SELF, &ru);
193 tproc = GST_TIMEVAL_TO_TIME (ru.ru_utime) + GST_TIMEVAL_TO_TIME (ru.ru_stime);
195 getrusage (RUSAGE_THREAD, &ru);
197 GST_TIMEVAL_TO_TIME (ru.ru_utime) + GST_TIMEVAL_TO_TIME (ru.ru_stime);
200 /* get stats record for current thread */
201 if (!(stats = g_hash_table_lookup (self->threads, thread_id))) {
202 stats = g_slice_new0 (GstThreadStats);
203 stats->tvs_thread = make_trace_values (GST_SECOND);
204 g_hash_table_insert (self->threads, thread_id, stats);
206 stats->tthread = tthread;
208 /* Calibrate ts for the process and main thread. For tthread[main] and tproc
209 * the time is larger than ts, as our base-ts is taken after the process has
212 if (G_UNLIKELY (thread_id == self->main_thread_id)) {
213 self->main_thread_id = NULL;
214 /* when the registry gets updated, the tproc is less than the debug time ? */
215 /* TODO(ensonic): we still see cases where tproc overtakes ts, especially
216 * when with sync=false, can this be due to multiple cores in use? */
218 self->tproc_base = tproc - ts;
219 GST_DEBUG ("rusage: calibrating by %" G_GUINT64_FORMAT ", thread: %"
220 G_GUINT64_FORMAT ", proc: %" G_GUINT64_FORMAT,
221 self->tproc_base, stats->tthread, tproc);
222 stats->tthread -= self->tproc_base;
225 /* we always need to correct proc time */
226 tproc -= self->tproc_base;
228 /* FIXME: how can we take cpu-frequency scaling into account?
229 * - looking at /sys/devices/system/cpu/cpu0/cpufreq/
230 * scale_factor=scaling_max_freq/scaling_cur_freq
231 * - as a workaround we can switch it via /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
232 * cpufreq-selector -g performance
233 * cpufreq-selector -g ondemand
236 avg_cpuload = (guint) gst_util_uint64_scale (stats->tthread,
237 G_GINT64_CONSTANT (1000), ts);
238 update_trace_value (stats->tvs_thread, ts, stats->tthread, &dts, &dtproc);
239 cur_cpuload = (guint) gst_util_uint64_scale (dtproc,
240 G_GINT64_CONSTANT (1000), dts);
241 gst_tracer_record_log (tr_thread, (guint64)thread_id, ts,
242 MIN (avg_cpuload, 1000), MIN (cur_cpuload, 1000), stats->tthread);
244 avg_cpuload = (guint) gst_util_uint64_scale (tproc / num_cpus,
245 G_GINT64_CONSTANT (1000), ts);
247 update_trace_value (self->tvs_proc, ts, tproc, &dts, &dtproc);
249 cur_cpuload = (guint) gst_util_uint64_scale (dtproc / num_cpus,
250 G_GINT64_CONSTANT (1000), dts);
251 gst_tracer_record_log (tr_proc, ts, MIN (avg_cpuload, 1000),
252 MIN (cur_cpuload, 1000), tproc);
259 gst_rusage_tracer_finalize (GObject * obj)
261 GstRUsageTracer *self = GST_RUSAGE_TRACER (obj);
263 g_hash_table_destroy (self->threads);
264 free_trace_values (self->tvs_proc);
266 G_OBJECT_CLASS (parent_class)->finalize (obj);
270 gst_rusage_tracer_class_init (GstRUsageTracerClass * klass)
272 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
274 gobject_class->finalize = gst_rusage_tracer_finalize;
276 if ((num_cpus = sysconf (_SC_NPROCESSORS_ONLN)) == -1) {
277 GST_WARNING ("failed to get number of cpus online");
278 if ((num_cpus = sysconf (_SC_NPROCESSORS_CONF)) == -1) {
279 GST_WARNING ("failed to get number of cpus, assuming 1");
283 GST_DEBUG ("rusage: num_cpus=%ld", num_cpus);
285 /* announce trace formats */
287 tr_thread = gst_tracer_record_new (gst_structure_new ("thread-rusage.class",
288 "thread-id", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
289 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
290 "related-to", GST_TYPE_TRACER_VALUE_SCOPE, GST_TRACER_VALUE_SCOPE_THREAD,
292 "ts", GST_TYPE_STRUCTURE, gst_structure_new ("value",
293 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
294 "description", G_TYPE_STRING, "event ts",
296 "average-cpuload", GST_TYPE_STRUCTURE, gst_structure_new ("value",
297 "type", G_TYPE_GTYPE, G_TYPE_UINT,
298 "description", G_TYPE_STRING, "average cpu usage per thread in ‰",
299 "flags", G_TYPE_STRING, "aggregated", /* TODO: use gflags */
300 "min", G_TYPE_UINT, 0,
301 "max", G_TYPE_UINT, 1000,
303 "current-cpuload", GST_TYPE_STRUCTURE, gst_structure_new ("value",
304 "type", G_TYPE_GTYPE, G_TYPE_UINT,
305 "description", G_TYPE_STRING, "current cpu usage per thread in ‰",
306 "flags", G_TYPE_STRING, "windowed", /* TODO: use gflags */
307 "min", G_TYPE_UINT, 0,
308 "max", G_TYPE_UINT, 1000,
310 "time", GST_TYPE_STRUCTURE, gst_structure_new ("value",
311 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
312 "description", G_TYPE_STRING, "time spent in thread in ns",
313 "flags", G_TYPE_STRING, "aggregated", /* TODO: use gflags */
314 "min", G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
315 "max", G_TYPE_UINT64, G_MAXUINT64,
318 tr_proc = gst_tracer_record_new (gst_structure_new ("proc-rusage.class",
319 "thread-id", GST_TYPE_STRUCTURE, gst_structure_new ("scope",
320 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
321 "related-to", GST_TYPE_TRACER_VALUE_SCOPE, GST_TRACER_VALUE_SCOPE_PROCESS,
323 "ts", GST_TYPE_STRUCTURE, gst_structure_new ("value",
324 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
325 "description", G_TYPE_STRING, "event ts",
327 "average-cpuload", GST_TYPE_STRUCTURE, gst_structure_new ("value",
328 "type", G_TYPE_GTYPE, G_TYPE_UINT,
329 "description", G_TYPE_STRING, "average cpu usage per process in ‰",
330 "flags", G_TYPE_STRING, "aggregated", /* TODO: use gflags */
331 "min", G_TYPE_UINT, 0,
332 "max", G_TYPE_UINT, 1000,
334 "current-cpuload", GST_TYPE_STRUCTURE, gst_structure_new ("value",
335 "type", G_TYPE_GTYPE, G_TYPE_UINT,
336 "description", G_TYPE_STRING, "current cpu usage per process in ‰",
337 "flags", G_TYPE_STRING, "windowed", /* TODO: use gflags */
338 "min", G_TYPE_UINT, 0,
339 "max", G_TYPE_UINT, 1000,
341 "time", GST_TYPE_STRUCTURE, gst_structure_new ("value",
342 "type", G_TYPE_GTYPE, G_TYPE_UINT64,
343 "description", G_TYPE_STRING, "time spent in process in ns",
344 "flags", G_TYPE_STRING, "aggregated", /* TODO: use gflags */
345 "min", G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
346 "max", G_TYPE_UINT64, G_MAXUINT64,
353 gst_rusage_tracer_init (GstRUsageTracer * self)
355 GstTracer *tracer = GST_TRACER (self);
357 gst_tracing_register_hook (tracer, NULL, G_CALLBACK (do_stats));
359 self->threads = g_hash_table_new_full (NULL, NULL, NULL, free_thread_stats);
360 self->tvs_proc = make_trace_values (GST_SECOND);
361 self->main_thread_id = g_thread_self ();
363 GST_DEBUG ("rusage: main thread=%p", self->main_thread_id);