A PHP extension which provides functions to modify CPU affinity
Affinity extension provides three functions:
- getaffinity get CPU number which current process is running in.
- setaffinity change the process to another CPU
- getcpucores get number of CPU cores
tar zxvf affinity.tar.gz
cd affinity
phpize
./configure --with-php-config=/path/to/php-config
make && make test && make install/**
* set CPU affinity
*
* @param $cpu_id
* @return bool
*/
function setaffinity($cpu_id){
$num = getcpucores();
if($cpu_id >= $num){
return false;
}
$set = system_call($cpu_id);
if($set === -1){
return false;
}
return true;
}
/**
* get CPU affinity
*
* @return bool
*/
function getaffinity(){
$cpu_id = system_call();
if($cpu_id === -1){
return false;
}
return $cpu_id;
}
/**
* get number of CPU
*
* @return bool
*/
function getcpucores(){
$nums = system_call();
if($nums === -1){
return false;
}
return $nums;
}