How to handle "Fork too many process"

For example,

The maximum process is now 500 and you need set it to 1000

1. lsattr -El sys0 |grep max results shows that maximum process allowed is 500.
2. ulimit shows unlimited.
3. The /etc/security/limits shows unlimited.
chdev -l sys0 -a maxuproc='1000'
Please take care that this change is re boot required.

Please also consider the following factor
No. of Concurrent Users x @1 job
System Demons ~15+ jobs
No. of integration productions x @10+ jobs