Update common_thread.h

common_thread.h

@@ -140,7 +140,10 @@ static __inline int num_cpu_avail(int level) {
 
 #ifdef USE_OPENMP
 	int openmp_nthreads=omp_get_max_threads();
-	if (openmp_nthreads > MAX_CPU_NUMBER) openmp_nthreads=MAX_CPU_NUMBER;
+	if (openmp_nthreads > MAX_CPU_NUMBER) {
+		openmp_nthreads=MAX_CPU_NUMBER;
+	fprintf(stderr,"thread count limited to compile-time max %d\n",MAX_CPU_NUMBER);
+	}
 #endif
 
 #ifndef USE_OPENMP