runtime/starpu: add a warning if parallel workers are initialized without...

runtime/starpu: add a warning if parallel workers are initialized without multi-threaded BLAS library

include/chameleon/config.h.in

@@ -37,6 +37,9 @@
 /* Debug coreblas execution order if not provided by the runtime */
 #cmakedefine CHAMELEON_KERNELS_TRACE
 
+/* Enable multi-threaded BLAS library */
+#cmakedefine CHAMELEON_KERNELS_MT
+
 /* Communication engine */
 #cmakedefine CHAMELEON_USE_MPI
 #cmakedefine CHAMELEON_USE_MIGRATE

runtime/starpu/control/runtime_control.c

@@ -38,7 +38,6 @@ void chameleon_starpu_parallel_worker_init( starpu_sched_opt_t *sched_opt )
 
     if (env_pw_level != NULL) {
         struct starpu_parallel_worker_config *pw_config = NULL;
-
         hwloc_obj_type_t pw_level;
         int  pw_level_number = 1;
         char level[256];
@@ -46,6 +45,10 @@ void chameleon_starpu_parallel_worker_init( starpu_sched_opt_t *sched_opt )
         int argc  = strchr( env_pw_level, ':') == NULL ? 1 : 2;
         int match = sscanf( env_pw_level, "%[^:]:%d", level, &pw_level_number );
 
+#if !defined(CHAMELEON_KERNELS_MT)
+        chameleon_warning("chameleon_starpu_parallel_worker_init()", "CHAMELEON has been compiled with multi-threaded kernels disabled (-DCHAMELEON_KERNELS_MT=OFF). This won't break the execution, but you may not obtain the performance gain expected. It is recommended to recompile with -DCHAMELEON_KERNELS_MT=ON.\n");
+#endif
+
         if ( (match != argc) ||
              ((match == 2) && (pw_level_number < 0) ) )
         {