print the number of measurements

src/core/perfmodel/perfmodel_history.c

@@ -1230,7 +1230,7 @@ double _starpu_non_linear_regression_based_job_expected_perf(struct starpu_perfm
 			char archname[32];
 
 			starpu_perfmodel_get_arch_name(arch, archname, sizeof(archname), nimpl);
-			_STARPU_DISP("Warning: model %s is not calibrated enough for %s, forcing calibration for this run. Use the STARPU_CALIBRATE environment variable to control this.\n", model->symbol, archname);
+			_STARPU_DISP("Warning: model %s is not calibrated enough for %s (only %u measurements), forcing calibration for this run. Use the STARPU_CALIBRATE environment variable to control this.\n", model->symbol, archname, entry && entry->history_entry ? entry->history_entry->nsample : 0);
 			_starpu_set_calibrate_flag(1);
 			model->benchmarking = 1;
 		}
@@ -1272,7 +1272,7 @@ double _starpu_history_based_job_expected_perf(struct starpu_perfmodel *model, s
 		char archname[32];
 
 		starpu_perfmodel_get_arch_name(arch, archname, sizeof(archname), nimpl);
-		_STARPU_DISP("Warning: model %s is not calibrated enough for %s, forcing calibration for this run. Use the STARPU_CALIBRATE environment variable to control this.\n", model->symbol, archname);
+		_STARPU_DISP("Warning: model %s is not calibrated enough for %s (only %u measurements), forcing calibration for this run. Use the STARPU_CALIBRATE environment variable to control this.\n", model->symbol, archname, entry ? entry->nsample : 0);
 		_starpu_set_calibrate_flag(1);
 		model->benchmarking = 1;
 	}