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Measure CPU for demodulator, read thread, and background tasks individually.

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This commit is contained in:
Oliver Jowett 2015-01-23 01:22:22 +00:00
parent 9deac8d894
commit 5b40377b98
5 changed files with 88 additions and 32 deletions
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61
dump1090.c
View file

@ -80,6 +80,22 @@ void sigWinchCallback() {
#else
int getTermRows() { return MODES_INTERACTIVE_ROWS;}
#endif
static void start_cpu_timing(struct timespec *start_time)
{
clock_gettime(CLOCK_THREAD_CPUTIME_ID, start_time);
}
static void end_cpu_timing(const struct timespec *start_time, struct timespec *add_to)
{
struct timespec end_time;
clock_gettime(CLOCK_THREAD_CPUTIME_ID, &end_time);
add_to->tv_sec += (end_time.tv_sec - start_time->tv_sec - 1);
add_to->tv_nsec += (1000000000L + end_time.tv_nsec - start_time->tv_nsec);
add_to->tv_sec += add_to->tv_nsec / 1000000000L;
add_to->tv_nsec = add_to->tv_nsec % 1000000000L;
}
//
// =============================== Initialization ===========================
//
@ -326,6 +342,9 @@ int modesInitRTLSDR(void) {
//
// A Mutex is used to avoid races with the decoding thread.
//
static struct timespec reader_thread_start;
void rtlsdrCallback(unsigned char *buf, uint32_t len, void *ctx) {
MODES_NOTUSED(ctx);
@ -359,6 +378,10 @@ void rtlsdrCallback(unsigned char *buf, uint32_t len, void *ctx) {
Modes.iDataLost++;
}
// accumulate CPU while holding the mutex, and restart measurement
end_cpu_timing(&reader_thread_start, &Modes.reader_cpu_accumulator);
start_cpu_timing(&reader_thread_start);
// Signal to the other thread that new data is ready, and unlock
pthread_cond_signal(&Modes.data_cond);
pthread_mutex_unlock(&Modes.data_mutex);
@ -415,6 +438,10 @@ void readDataFromFile(void) {
Modes.iDataIn = (MODES_ASYNC_BUF_NUMBER-1) & (Modes.iDataIn + 1);
Modes.iDataReady = (MODES_ASYNC_BUF_NUMBER-1) & (Modes.iDataIn - Modes.iDataOut);
// accumulate CPU while holding the mutex, and restart measurement
end_cpu_timing(&reader_thread_start, &Modes.reader_cpu_accumulator);
start_cpu_timing(&reader_thread_start);
// Signal to the other thread that new data is ready
pthread_cond_signal(&Modes.data_cond);
}
@ -432,6 +459,8 @@ void readDataFromFile(void) {
void *readerThreadEntryPoint(void *arg) {
MODES_NOTUSED(arg);
start_cpu_timing(&reader_thread_start); // we accumulate in rtlsdrCallback() or readDataFromFile()
if (Modes.filename == NULL) {
while (!Modes.exit) {
rtlsdr_read_async(Modes.dev, rtlsdrCallback, NULL,
@ -967,11 +996,17 @@ int main(int argc, char **argv) {
// If the user specifies --net-only, just run in order to serve network
// clients without reading data from the RTL device
while (Modes.net_only) {
struct timespec start_time;
if (Modes.exit) {
display_total_stats();
exit(0); // If we exit net_only nothing further in main()
}
start_cpu_timing(&start_time);
backgroundTasks();
end_cpu_timing(&start_time, &Modes.stats_current.background_cpu);
usleep(100000);
}
@ -980,15 +1015,21 @@ int main(int argc, char **argv) {
pthread_mutex_lock(&Modes.data_mutex);
while (Modes.exit == 0) {
struct timespec cpu_start_time, cpu_end_time;
struct timespec start_time;
if (Modes.iDataReady == 0) {
pthread_cond_wait(&Modes.data_cond,&Modes.data_mutex); // This unlocks Modes.data_mutex, and waits for Modes.data_cond
continue; // Once (Modes.data_cond) occurs, it locks Modes.data_mutex
}
// copy out reader CPU time and reset it
add_timespecs(&Modes.reader_cpu_accumulator, &Modes.stats_current.reader_cpu, &Modes.stats_current.reader_cpu);
Modes.reader_cpu_accumulator.tv_sec = 0;
Modes.reader_cpu_accumulator.tv_nsec = 0;
// Modes.data_mutex is Locked, and (Modes.iDataReady != 0)
if (Modes.iDataReady) { // Check we have new data, just in case!!
start_cpu_timing(&start_time);
Modes.iDataOut &= (MODES_ASYNC_BUF_NUMBER-1); // Just incase
@ -1016,36 +1057,28 @@ int main(int argc, char **argv) {
// thread can read data while we perform computationally expensive
// stuff at the same time.
clock_gettime(CLOCK_THREAD_CPUTIME_ID, &cpu_start_time);
if (Modes.oversample)
demodulate2400(Modes.magnitude, MODES_ASYNC_BUF_SAMPLES);
else
demodulate2000(Modes.magnitude, MODES_ASYNC_BUF_SAMPLES);
clock_gettime(CLOCK_THREAD_CPUTIME_ID, &cpu_end_time);
Modes.stats_current.cputime.tv_sec += (cpu_end_time.tv_sec - cpu_start_time.tv_sec);
Modes.stats_current.cputime.tv_nsec += (cpu_end_time.tv_nsec - cpu_start_time.tv_nsec);
if (Modes.stats_current.cputime.tv_nsec < 0) {
Modes.stats_current.cputime.tv_nsec += 1000000000L;
Modes.stats_current.cputime.tv_sec--;
} else if (Modes.stats_current.cputime.tv_nsec > 1000000000L) {
Modes.stats_current.cputime.tv_nsec -= 1000000000L;
Modes.stats_current.cputime.tv_sec++;
}
// Update the timestamp ready for the next block
if (Modes.oversample)
Modes.timestampBlk += (MODES_ASYNC_BUF_SAMPLES*5);
else
Modes.timestampBlk += (MODES_ASYNC_BUF_SAMPLES*6);
Modes.stats_current.blocks_processed++;
end_cpu_timing(&start_time, &Modes.stats_current.demod_cpu);
} else {
pthread_cond_signal (&Modes.data_cond);
pthread_mutex_unlock(&Modes.data_mutex);
}
start_cpu_timing(&start_time);
backgroundTasks();
end_cpu_timing(&start_time, &Modes.stats_current.background_cpu);
pthread_mutex_lock(&Modes.data_mutex);
}

1
dump1090.h
View file

@ -289,6 +289,7 @@ struct { // Internal state
int iDataOut; // Fifo output pointer
int iDataReady; // Fifo content count
int iDataLost; // Count of missed buffers
struct timespec reader_cpu_accumulator; // CPU time used by the reader thread, copied out and reset by the main thread under the mutex
int trailing_samples;// extra trailing samples in magnitude buffer

10
net_io.c
View file

@ -827,14 +827,12 @@ static char * appendStatsJson(char *p,
p += snprintf(p, end-p,
",\"local\":{\"blocks_processed\":%u"
",\"blocks_dropped\":%u"
",\"cputime\":%d.%09ld"
",\"modeac\":%u"
",\"modes\":%u"
",\"bad\":%u"
",\"unknown_icao\":%u",
st->blocks_processed,
st->blocks_dropped,
(int)st->cputime.tv_sec, (long)st->cputime.tv_nsec,
st->demod_modeac,
st->demod_preambles,
st->demod_rejected_bad,
@ -884,14 +882,18 @@ static char * appendStatsJson(char *p,
",\"global_skipped\":%u"
",\"local_ok\":%u"
",\"local_skipped\":%u"
",\"filtered\":%u"
"},\"messages\":%u}",
",\"filtered\":%u}"
",\"cpu\":{\"demod\":%d.%09ld,\"reader\":%d.%09ld,\"background\":%d.%09ld}"
",\"messages\":%u}",
st->cpr_global_ok,
st->cpr_global_bad,
st->cpr_global_skipped,
st->cpr_local_ok,
st->cpr_local_skipped,
st->cpr_filtered,
(int)st->demod_cpu.tv_sec, (long)st->demod_cpu.tv_nsec,
(int)st->reader_cpu.tv_sec, (long)st->reader_cpu.tv_nsec,
(int)st->background_cpu.tv_sec, (long)st->background_cpu.tv_nsec,
st->messages_total);
return p;

37
stats.c
View file

@ -49,6 +49,14 @@
#include "dump1090.h"
void add_timespecs(const struct timespec *x, const struct timespec *y, struct timespec *z)
{
z->tv_sec = x->tv_sec + y->tv_sec;
z->tv_nsec = x->tv_nsec + y->tv_nsec;
z->tv_sec += z->tv_nsec / 1000000000L;
z->tv_nsec = z->tv_nsec % 1000000000L;
}
void display_stats(struct stats *st) {
int j;
struct tm tm_start, tm_end;
@ -70,13 +78,6 @@ void display_stats(struct stats *st) {
printf(" %u sample blocks processed\n", st->blocks_processed);
printf(" %u sample blocks dropped\n", st->blocks_dropped);
if (st->blocks_processed > 0) {
long cpu_millis = (long)st->cputime.tv_sec*1000L + st->cputime.tv_nsec/1000000L;
long sample_millis = (long) ((uint64_t)st->blocks_processed * MODES_ASYNC_BUF_SAMPLES / (Modes.oversample ? 2400 : 2000));
printf(" %ld ms CPU time used to process %ld ms samples, %.1f%% load\n",
cpu_millis, sample_millis, 100.0 * cpu_millis / sample_millis);
}
printf(" %u Mode A/C messages received\n", st->demod_modeac);
printf(" %u Mode-S message preambles received\n", st->demod_preambles);
printf(" %u with bad message format or invalid CRC\n", st->demod_rejected_bad);
@ -132,6 +133,21 @@ void display_stats(struct stats *st) {
if (Modes.net && Modes.net_http_port)
printf("%d HTTP requests\n", st->http_requests);
{
uint64_t demod_cpu_millis = (uint64_t)st->demod_cpu.tv_sec*1000UL + st->demod_cpu.tv_nsec/1000000UL;
uint64_t reader_cpu_millis = (uint64_t)st->reader_cpu.tv_sec*1000UL + st->reader_cpu.tv_nsec/1000000UL;
uint64_t background_cpu_millis = (uint64_t)st->background_cpu.tv_sec*1000UL + st->background_cpu.tv_nsec/1000000UL;
printf("CPU load: %.1f%%\n"
" %lu ms for demodulation\n"
" %lu ms for reading from USB\n"
" %lu ms for network input and background tasks\n",
0.1 * (demod_cpu_millis + reader_cpu_millis + background_cpu_millis) / (st->end - st->start + 1),
demod_cpu_millis,
reader_cpu_millis,
background_cpu_millis);
}
fflush(stdout);
}
@ -164,10 +180,9 @@ void add_stats(const struct stats *st1, const struct stats *st2, struct stats *t
target->blocks_processed = st1->blocks_processed + st2->blocks_processed;
target->blocks_dropped = st1->blocks_dropped + st2->blocks_dropped;
target->cputime.tv_sec = st1->cputime.tv_sec + st2->cputime.tv_sec;
target->cputime.tv_nsec = st1->cputime.tv_nsec + st2->cputime.tv_nsec;
target->cputime.tv_sec += target->cputime.tv_nsec / 1000000000L;
target->cputime.tv_nsec %= 1000000000L;
add_timespecs(&st1->demod_cpu, &st2->demod_cpu, &target->demod_cpu);
add_timespecs(&st1->reader_cpu, &st2->reader_cpu, &target->reader_cpu);
add_timespecs(&st1->background_cpu, &st2->background_cpu, &target->background_cpu);
// noise floor:
target->noise_power_sum = st1->noise_power_sum + st2->noise_power_sum;

9
stats.h
View file

@ -63,10 +63,13 @@ struct stats {
// Mode A/C demodulator counts:
uint32_t demod_modeac;
// timing:
uint32_t blocks_processed;
uint32_t blocks_dropped;
struct timespec cputime;
// timing:
struct timespec demod_cpu;
struct timespec reader_cpu;
struct timespec background_cpu;
// noise floor:
double noise_power_sum;
@ -108,4 +111,6 @@ void add_stats(const struct stats *st1, const struct stats *st2, struct stats *t
void display_stats(struct stats *st);
void reset_stats(struct stats *st);
void add_timespecs(const struct timespec *x, const struct timespec *y, struct timespec *z);
#endif