The Atlas Experiment Simulations As The Computing Challenge For The Ack Cyfronet Agh

The present High Energy Physics (HEP) experiments require unprecedented amount of computingpower and storage space. We present the WLCG structure of the LHC computing,which will be used to perform data processing required by the ATLAS collaboration. Wealso describe the ATLAS detector full simulation chain. Finally, we quantify the computingneeds and up-to-date usage of the ACK CYFRONET AGH resources by the ATLAS detector simulations