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4.x is outdated, please check the latest version 22.x
pecl install openswoole-22.0.0
<?php Swoole\Process::setaffinity(array $cpu_set) : bool
The array of cpu number. Use
SWOOLE_CPU_NUM to get the number of cpu.
For example: array(0,2,3) stands for CPU0/CPU2/CPU3
Set the CPU affinity of the process.