Task #3695: Log an error if CPU load on core 0 is critical

RTCP/IONProc/src/LogThread.cc

@@ -102,11 +102,23 @@ void LogThread::writeCPUstats(std::stringstream &str)
   struct CPUload load;
   struct timeval tv;
 
+  static size_t lowIdleCount = 0;
+
   if (readCPUstats(load)) {
     gettimeofday( &tv, 0 );
 
     float timediff = (tv.tv_sec - previousTimeval.tv_sec) + (tv.tv_usec - previousTimeval.tv_usec)/1.0e6;
 
+    unsigned idle0 = static_cast<unsigned>((load.idle0 - previousLoad.idle0) / timediff);
+    if (idle0 < 10)
+      lowIdleCount++;
+    else
+      lowIdleCount = 0;
+
+    // TODO: Don't print this error in non-realtime mode
+    if (lowIdleCount == 5)
+      LOG_ERROR("CPU load critical on core 0");
+
     //str << ", us/sy/in/id: ["
     str << ", us/sy/in/id(0): ["
 	<< fixed << setprecision(0) 
@@ -114,7 +126,7 @@ void LogThread::writeCPUstats(std::stringstream &str)
 	<< (unsigned(load.system    - previousLoad.system)    + 2) / 4 / timediff << '/'
 	<< (unsigned(load.interrupt - previousLoad.interrupt) + 2) / 4 / timediff << '/'
 	<< (unsigned(load.idle	    - previousLoad.idle)      + 2) / 4 / timediff << '('
-	<< (unsigned(load.idle0	    - previousLoad.idle0) / timediff) << ")]";
+	<< idle0 << ")]";
 #if 0
 	<< "], id: ["
 	<< (unsigned(load.idlePerCore[0] - previousLoad.idlePerCore[0]) << '/'