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:
[~]: 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.
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