Introduce display interval to enable tracing at high frequencies.

common/trace/trace_view.c

@@ -198,6 +198,7 @@ int main(int argc, char **argv)
 	double interval, history;
 	char *host;
         int trace_nr, i, port, ret = 0;
+	int display_interval = 1;
 
 	starttime = time(NULL);
 	host = "localhost";
@@ -326,6 +327,13 @@ int main(int argc, char **argv)
 		if (traces[i].value == NULL)
 			errx(1, "out of memory!");
 	}
+
+	double tmp_interval = interval;
+	while (tmp_interval < 0.2) {
+		tmp_interval *= 2;
+		display_interval *=2;
+	}
+	printf("Setting display interval %d\n", display_interval);
 	
 	fdplot = popen("gnuplot -noraise", "w");
 	if (fdplot == NULL) {
@@ -338,6 +346,7 @@ int main(int argc, char **argv)
 	samp_min = +INFINITY;
 	samp_max = -INFINITY;
 
+	int display_cnt = 0;
 	do {
 		fd_set fdrx;
 		
@@ -356,7 +365,11 @@ int main(int argc, char **argv)
 		}
 
 		if (doplot >= trace_nr) {
-			plot_values(traces, trace_nr);
+			display_cnt++;
+			if (display_cnt == display_interval) {
+				plot_values(traces, trace_nr);
+				display_cnt = 0;
+			}
 			doplot = 0;
 
 			samp_min = +INFINITY;