Pycharm out of memory error

I have recently started to use pycharm but when I am running my code, it gives me out of memory error. I searched for increasing heap size in pycharm so i get recommendations to install Ant Window Tool from which I can increase the heap size. But when I searched in plugins there was no ant window available and i also do not know the root url from which I can download and install the plugin.

Anyone please suggest an alternative way of increasing the heap size. Thanks