Hi Suhaili, I can not answer you about the SPECT benchmark that I don't know at all, and for the /run/beamOn to, because I always work on PET. But don't worry about the file size, I personally get more than 1GB of data (using root format) in my simulations only storing coincidences. They are also simple but usually last the real time of a scan. And in the case on long simulations with a lot of activity, I can get about 100GB !! So don't be afraid ! I am working in PET so it is normal to get larger files than in SPECT but 15MB is totally normal. Hope it could reassure you, Simon <div>2007/6/19, Suhaili Zakaria <<a href="mailto:suhailiz@gmail.com">suhailiz@gmail.com</a>>:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Hi I have a 'big' Root output file (usually up to 15MB!). I don't think it is common to have such a big file as I am running a simple simulation. In the root output commands, I set /gate/output/root/setRootSinglesFlag 1 and set 0 for others (I am working on SPECT) When I run the benchmarks file, it was less than 1MB. And, can someone explain when should we use /run/beamOn #? I really appreciate your reply. Many thanks, S _______________________________________________ Gate-users mailing list <a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:Gate-users@lists.healthgrid.org">Gate-users@lists.healthgrid.org </a> <a onclick="return top.js.OpenExtLink(window,event,this)" href="http://lists.healthgrid.org/mailman/listinfo/gate-users" target="_blank">http://lists.healthgrid.org/mailman/listinfo/gate-users</a> </blockquote> </div>