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There are two high performance xrootd spaces - The Tier 2 space and the Tier 3 space. These space are primarily for storing ROOT files and ATLAS datasets. Creating a new file or directory on a Xrootd space takes at least 5 seconds. So they are not good for large number of small files such as logs, codes, and small text files.

...

filelist = []
filelist += ["root://atl-xrdr//atlas/rucio/data15_13TeV:DAOD_MUON0.06783725._000004.pool.root.1"]
filelist += ["root://atl-xrdr//atlas/rucio/data15_13TeV:DAOD_MUON0.06783725._000001.pool.root.1"]
...
athenaCommonFlags.PoolESDInput=filelist

If the files are not at SLAC but are available in an ATLAS site that provides xrootd service, you can also access them by replacing "atl-xrdr" by "atlfax" (see below).

filelist = []
filelist += ["root://atlfax//atlas/rucio/data15_13TeV:DAOD_MUON0.06783725._000004.pool.root.1"]
filelist += ["root://atlfax//atlas/rucio/data15_13TeV:DAOD_MUON0.06783725._000001.pool.root.1"]
...
athenaCommonFlags.PoolESDInput=filelist

...