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Hi @simonmichal , Sorry for the delay in my response and thank you for your thorough explanation! The version I used to run those tests initially was 4.12.8, but I've just tried again with version 5 and I still see 5 threads when running the xrdcp process: ```bash [~]: xrootd -v v5.3.1 [~]: ps aux | grep xrdcp vpadulan 176936 33.6 0.1 463728 79400 pts/1 Sl+ 09:17 0:01 xrdcp root://eospublic.cern.ch//eos/opendata/cms/derived-data/AOD2NanoAODOutreachTool/Run2012BC_DoubleMuParked_Muons.root . vpadulan 177010 0.0 0.0 221396 852 pts/2 S+ 09:17 0:00 grep --color=auto xrdcp [~]: ps hH p 176936 | wc -l 5 ``` I will look further into `XRD_PARALLELEVTLOOP`, it is unclear for example how much this can change an application runtime which is already multithreaded /multiprocessed with high thread/process count. Up to you whether you want to close this issue now or understand better why I still get 5 threads. Let me know if I can help in that direction. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/1495#issuecomment-910016997 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1