Add cpu priority and affinity parameters

priority param value is from 0 (default idle like before) to 5 (highest)

affinity could be enhanced to set multiple cores... todo

Signed-off-by: Tanguy Pruvot <tanguy.pruvot@gmail.com>

README.txt

@@ -115,6 +115,8 @@ its command line interface and options.
   -b, --api-bind        IP/Port for the miner API (default: 127.0.0.1:4068)
       --benchmark       run in offline benchmark mode
       --cputest         debug hashes from cpu algorithms
+      --cpu-affinity    set process affinity to specific cpu core(s)
+      --cpu-priority    set process priority (default: 0 idle, 2 normal to 5 highest)
   -c, --config=FILE     load a JSON-format configuration file
       --no-color        disable colored console output
   -V, --version         display version information and exit
@@ -174,6 +176,7 @@ features.
 >>> RELEASE HISTORY <<<
 
   Jan.      2015  v1.5.2
+                  Add CPU priority and affinity parameters
                   Intelligent duplicate shares check feature (enabled if needed)
                   api: Fan RPM (windows), Cuda threads count, linux kernel ver.
                   More X11 optimisations from sp and KlausT

ccminer.cpp

@@ -207,6 +207,8 @@ static json_t *opt_config;
 static const bool opt_time = true;
 static enum sha_algos opt_algo = ALGO_X11;
 int opt_n_threads = 0;
+int opt_affinity = -1;
+int opt_priority = 0;
 static double opt_difficulty = 1; // CH
 bool opt_trust_pool = false;
 uint16_t opt_vote = 9999;
@@ -320,6 +322,8 @@ Options:\n\
       --no-color        disable colored output\n\
   -D, --debug           enable debug output\n\
   -P, --protocol-dump   verbose dump of protocol-level activities\n\
+      --cpu-affinity    set process affinity to specific cpu core(s)\n\
+      --cpu-priority    set process priority (default: 0 idle, 2 normal to 5 highest)\n\
   -b, --api-bind        IP/Port for the miner API (default: 127.0.0.1:4068)\n"
 
 #ifdef HAVE_SYSLOG_H
@@ -358,6 +362,8 @@ static struct option const options[] = {
 	{ "cert", 1, NULL, 1001 },
 	{ "config", 1, NULL, 'c' },
 	{ "cputest", 0, NULL, 1006 },
+	{ "cpu-affinity", 1, NULL, 1020 },
+	{ "cpu-priority", 1, NULL, 1021 },
 	{ "debug", 0, NULL, 'D' },
 	{ "help", 0, NULL, 'h' },
 	{ "intensity", 1, NULL, 'i' },
@@ -1091,17 +1097,52 @@ static void *miner_thread(void *userdata)
 	/* Set worker threads to nice 19 and then preferentially to SCHED_IDLE
 	 * and if that fails, then SCHED_BATCH. No need for this to be an
 	 * error if it fails */
-	if (!opt_benchmark) {
-		setpriority(PRIO_PROCESS, 0, 19);
+	if (!opt_benchmark && opt_priority == 0) {
+		setpriority(PRIO_PROCESS, 0, 18);
+		drop_policy();
+	} else {
+		int prio = 0;
+#ifndef WIN32
+		prio = 18;
+		// note: different behavior on linux (-19 to 19)
+		switch (opt_priority) {
+			case 1:
+				prio = 5;
+				break;
+			case 2:
+				prio = 0;
+				break;
+			case 3:
+				prio = -5;
+				break;
+			case 4:
+				prio = -10;
+				break;
+			case 5:
+				prio = -15;
+		}
+		applog(LOG_DEBUG, "Thread %d priority %d (set to %d)", thr_id,
+			opt_priority, prio);
+#endif
+		int ret = setpriority(PRIO_PROCESS, 0, prio);
+		if (opt_priority == 0) {
 			drop_policy();
 		}
+	}
 
 	/* Cpu thread affinity */
-	if (num_cpus > 1 && opt_n_threads > 1) {
+	if (num_cpus > 1) {
+		if (opt_affinity == -1 && opt_n_threads > 1) {
 			if (!opt_quiet)
 				applog(LOG_DEBUG, "Binding thread %d to cpu %d", thr_id,
 						thr_id % num_cpus);
 			affine_to_cpu(thr_id, thr_id % num_cpus);
+		} else if (opt_affinity != -1) {
+			if (!opt_quiet)
+				applog(LOG_DEBUG, "Binding thread %d to cpu %d", thr_id,
+						opt_affinity);
+			affine_to_cpu(thr_id, opt_affinity);
+		}
 	}
 
 	while (1) {
@@ -1965,6 +2006,20 @@ static void parse_arg(int key, char *arg)
 			opt_syslog_pfx = strdup(arg);
 		}
 		break;
+	case 1020:
+		v = atoi(arg);
+		if (v < -1)
+			v = -1;
+		if (v >= num_cpus)
+			v = num_cpus-1;
+		opt_affinity = v;
+		break;
+	case 1021:
+		v = atoi(arg);
+		if (v < 0 || v > 5)	/* sanity check */
+			show_usage_and_exit(1);
+		opt_priority = v;
+		break;
 	case 'd': // CB
 		{
 			int ngpus = cuda_num_devices();

compat.h

@@ -5,6 +5,8 @@
 
 #include <windows.h>
 
+extern int opt_priority;
+
 static __inline void sleep(int secs)
 {
 	Sleep(secs * 1000);
@@ -16,7 +18,27 @@ enum {
 
 static __inline int setpriority(int which, int who, int prio)
 {
-	return -!SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_IDLE /*THREAD_PRIORITY_TIME_CRITICAL*/);
+	switch (opt_priority) {
+		case 5:
+			prio = THREAD_PRIORITY_TIME_CRITICAL;
+			break;
+		case 4:
+			prio = THREAD_PRIORITY_HIGHEST;
+			break;
+		case 3:
+			prio = THREAD_PRIORITY_ABOVE_NORMAL;
+			break;
+		case 2:
+			prio = THREAD_PRIORITY_NORMAL;
+			break;
+		case 1:
+			prio = THREAD_PRIORITY_BELOW_NORMAL;
+			break;
+		case 0:
+		default:
+			prio = THREAD_PRIORITY_IDLE;
+	}
+	return -!SetThreadPriority(GetCurrentThread(), prio);
 }
 
 #endif /* WIN32 */