RAPL

powercap.c

@@ -0,0 +1,24 @@
+// gcc -O3 powercap.c -o powercap
+
+#include <stdlib.h>
+#include <stdio.h>
+
+void read_energy(char *path) {
+	FILE *fd = fopen(path, "r");
+	if(fd) {
+		char buf[32];
+		int len = fread(buf, 1, 31, fd);
+		fclose(fd);
+		buf[len] = 0;
+		printf("%s", buf);
+	} else {
+		printf("-1\n");
+	}
+}
+
+int main() {
+	read_energy("/sys/class/powercap/intel-rapl/subsystem/intel-rapl:0:0/energy_uj");
+	read_energy("/sys/class/powercap/intel-rapl/subsystem/intel-rapl:0:1/energy_uj");
+	read_energy("/sys/class/powercap/intel-rapl/subsystem/intel-rapl:0:2/energy_uj");
+	return 0;
+}