Apologies! I did change my script to try the module you suggested but while running, i was calling a different script :P Sorry for that.

It's working with the Parallel::ForkManager module! :)

Well, i am on the lookout for modules whenever i have some issue to fix. While writing this script, i thought let's leave modules and use the basics ('fork'). Looks like it was a wrong choice for me at least for this problem. :D Anyways, thanks a lot sundialsvc4! This issue was disturbing me for quite some time now. :)