diff options
| -rw-r--r-- | Makefile | 2 | ||||
| -rw-r--r-- | README.md | 9 | ||||
| -rw-r--r-- | i915-watt.c | 31 |
3 files changed, 42 insertions, 0 deletions
diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..b187608 --- /dev/null +++ b/Makefile @@ -0,0 +1,2 @@ +CFLAGS ?= -O3 -march=native +i915-watt: diff --git a/README.md b/README.md new file mode 100644 index 0000000..ee36e16 --- /dev/null +++ b/README.md @@ -0,0 +1,9 @@ +### i915-watt + +This tool displays second-long samples of power usage of the Intel graphics card. + +``` +$ git clone https://git.zx2c4.com/i915-watt && cd i915-watt +$ make +$ sudo ./i915-watt +``` diff --git a/i915-watt.c b/i915-watt.c new file mode 100644 index 0000000..bfbb64b --- /dev/null +++ b/i915-watt.c @@ -0,0 +1,31 @@ +#include <stdio.h> +#include <stdint.h> +#include <inttypes.h> +#include <unistd.h> + +int main(int argc, char *argv[]) +{ + FILE *f; + uint64_t this_microjoules, last_microjoules = ~UINT64_C(0); + + setbuf(stdout, NULL); + f = fopen("/sys/kernel/debug/dri/0/i915_energy_uJ", "r"); + if (!f) { + perror("fopen(/sys/kernel/debug/dri/0/i915_energy_uJ)"); + return 1; + } + + printf("Measuring..."); + for (;;) { + if (fscanf(f, "%" PRIu64, &this_microjoules) != 1) { + perror("fscanf"); + return 1; + } + rewind(f); + if (last_microjoules != ~UINT64_C(0)) + printf("\x1b[0G\x1b[0K%.2f W", (double)(this_microjoules - last_microjoules) / 1000000.0); + last_microjoules = this_microjoules; + sleep(1); + } + return 0; +} |