Improve the error message for thread creation failure

driver/others/blas_server.c

@@ -595,6 +595,8 @@ int blas_thread_init(void){
 	struct rlimit rlim;
         const char *msg = strerror(ret);
         fprintf(STDERR, "OpenBLAS blas_thread_init: pthread_create failed for thread %ld of %d: %s\n", i+1,blas_num_threads,msg);
+	fprintf(STDERR, "OpenBLAS blas_thread_init: ensure that your address space and process count limits are big enough (ulimit -a)\n");
+	fprintf(STDERR, "OpenBLAS blas_thread_init: or set a smaller OPENBLAS_NUM_THREADS to fit into what you have available\n");
 #ifdef RLIMIT_NPROC
         if(0 == getrlimit(RLIMIT_NPROC, &rlim)) {
           fprintf(STDERR, "OpenBLAS blas_thread_init: RLIMIT_NPROC "