Message boards : ATLAS application : What ATLAS simulations are we running?
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Jim1348

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Message 37743 - Posted: 12 Jan 2019, 16:06:58 UTC

Does anyone know whether we are doing ATLAS simulations for the already completed run, or for the new run after the upgrade is completed?

I have not heard anything from the project managers on this. Thanks.
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David Cameron
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Message 37769 - Posted: 16 Jan 2019, 10:59:03 UTC - in response to Message 37743.  

The current simulations are to help with the analysis of data from the run that was just completed (run 2). In the last 4 years, 45 Petabytes of raw data was recorded from the ATLAS detector and this has to be continuously processed and filtered for physicists to analyse. Due to the sheer volume of data and complexity of processing it, it will take literally years to analyse and extract all the relevant physics results, and simulated data is essential for these analyses. So we will continue to simulate data for run 2 for the foreseeable future and it will be probably at least one year before we start simulations for the next run (run 3) scheduled to start in 2021.

For anyone interested in more details of simulation and why it is needed I recommend these three blog articles - they are from 2014 but still relevant today.
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Jim1348

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Message 37770 - Posted: 16 Jan 2019, 16:11:57 UTC - in response to Message 37769.  

Thank you. That is just what I need.
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Profile Chilean
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Message 38568 - Posted: 17 Apr 2019, 14:17:11 UTC

Does Theory use the same concept for the simulations as ATLAS and CMS?

I really like Theory for their statistics (I can easily keep track on the number of events being simulated...). ATLAS and CMS are sort of "blind" regarding your output, so you can't keep track beyond the RAC that BOINC gives you (which can be bogus since a WU could "finish" with the VM machine doing nothing).
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computezrmle

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Message 38569 - Posted: 17 Apr 2019, 14:46:46 UTC - in response to Message 38568.  

On one side ATLAS and CMS are very similar to Theory as they also produce various outputs at the console windows or in a browser if you press the "graphics" button of your BOINC client.
On the other side, due to the nature of each app, those outputs are different and need interpretation.
CMS for example runs subtasks inside the VM and always makes a 10 min idle break between the end of a subtask and the start of the next one.
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Message boards : ATLAS application : What ATLAS simulations are we running?


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