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homemade_speedstep
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simplified some lines of code and updated README

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celso 2022-11-22 18:53:43 -03:00
parent a14428a111
commit 38fd93cc43
2 changed files with 6 additions and 7 deletions
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2
README.md
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@ -26,7 +26,7 @@ Run `make clean` to remove the compiled binary (note: only from `bin`, to remove
## How it works ## How it works
The program checks the available frequency steps supported by your CPU and uses them to set the maximum frequency your cpufreq governor may choose for it to run at. The program checks the available frequency steps supported by your CPU and uses them to set the maximum frequency your cpufreq governor may choose for it to run at.
Every second, the program reads the temperature of the CPU and two thresholds, a minimum and maximum temperature you provide it with, to set this maximum frequency. Every n ammount of seconds, set by the user at build time, the program reads the temperature of the CPU and two thresholds, a minimum and maximum temperature you provide it with, to set this maximum frequency.
Any time the temperature hits the upper threshold, the maximum frequency will be lowered by one step, until the temperature is below the threshold or the minimum step is reached. Any time the temperature hits the upper threshold, the maximum frequency will be lowered by one step, until the temperature is below the threshold or the minimum step is reached.

11
src/homemade_speedstep.c
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@ -14,8 +14,7 @@ void changespeed(int threads, char* step){
FILE* file; FILE* file;
for (i=0; i < threads; i++){ for (i=0; i < threads; i++){
sprintf(filename, MAXSPDPREFIX"%d"MAXSPDSUFFIX, i); sprintf(filename, MAXSPDPREFIX"%d"MAXSPDSUFFIX, i);
file = fopen(filename, "w"); if ((file = fopen(filename, "w")) != NULL){
if (file != NULL){
fprintf(file, "%s\n", step); fprintf(file, "%s\n", step);
fclose(file); fclose(file);
} }
@ -145,8 +144,8 @@ int main(int argc, char** argv){
return 2; return 2;
} }
/* try to open scaling_available_frequencies, exit on fail */ /* try to open scaling_available_frequencies, exit on fail */
FILE *freqsfile = fopen(FREQS, "r"); FILE *freqsfile;
if (freqsfile == NULL){ if ((freqsfile = fopen(FREQS, "r")) == NULL){
fprintf(stderr, "error: couldn't open scaling_available_frequencies\n"); fprintf(stderr, "error: couldn't open scaling_available_frequencies\n");
fprintf(stderr, " check that you have support for cpufreq\n"); fprintf(stderr, " check that you have support for cpufreq\n");
fprintf(stderr, " in your kernel and that the program is\n"); fprintf(stderr, " in your kernel and that the program is\n");
@ -170,8 +169,8 @@ int main(int argc, char** argv){
free(freqsfilec); free(freqsfilec);
fclose(freqsfile); fclose(freqsfile);
/* try to open scaling_maximum_frequency, exit on fail */ /* try to open scaling_maximum_frequency, exit on fail */
FILE* curmaxfile = fopen(MAXSPDPREFIX"0"MAXSPDSUFFIX, "r"); FILE* curmaxfile;
if (curmaxfile == NULL){ if ((curmaxfile = fopen(MAXSPDPREFIX"0"MAXSPDSUFFIX, "r")) == NULL){
fprintf(stderr, "error: couldn't open scaling_maximum_frequency\n"); fprintf(stderr, "error: couldn't open scaling_maximum_frequency\n");
fprintf(stderr, " check that you have support for cpufreq\n"); fprintf(stderr, " check that you have support for cpufreq\n");
fprintf(stderr, " in your kernel and that the program is\n"); fprintf(stderr, " in your kernel and that the program is\n");