It's the order of the first appearance of each PID in the OP's output.
So, more like de-interleaving than sorting.
In reply to Re^3: mod_perl children process
by RonW
in thread mod_perl children process
by LorCo
| For: | Use: | ||
| & | & | ||
| < | < | ||
| > | > | ||
| [ | [ | ||
| ] | ] |