Currently one_measurement() function prints following message after a successful run of the workload. $ sudo powertop --html --workload="sleep 1" Loaded 1 prior measurements Preparing to take measurements Measuring workload sleep 1. Unknown issue running workload! <-- here PowerTOP outputing using base filename powertop.html It seems this was because it wrongly checks return value of system. The return value of the system() call is the status of wait() call so that it should be zero if things went well. Signed-off-by: Namhyung Kim <namhyung(a)gmail.com&gt; --- src/main.cpp | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/main.cpp b/src/main.cpp index b22d11d..0883424 100644 --- a/src/main.cpp +++ b/src/main.cpp @@ -191,7 +191,7 @@ void one_measurement(int seconds, char *workload) start_cpu_measurement(); if (workload && workload[0]) { - if (!system(workload)) + if (system(workload)) fprintf(stderr, _("Unknown issue running workload!\n")); } else { do_sleep(seconds);