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Hi Adrian, Number of chunks is not the same thing as the -S|--streams option from xrdcp. Number of parallel chunks is set via XRD_CPPARALLELCHUNKS, Number of streams is set via XRD_SUBSTREAMSPERCHANNEL. Number of chunks means how many in-fly data-chunks we can have per channel. Number of streams means how many physical tcp connections we have per channel. Number of sources is the maximum number of sources (data servers) that will be used for extreme-copy. Of course each data source will have its own communication channel, so 'chunks' and 'streams' are per source. As we use non-block I/O neither adding sources, streams nor chunks will create new threads. I hope that helps. Don't hesitate to ask if you need more clarification on this subject! Cheers, Michal ________________________________________ From: Adrian Sevcenco Sent: 17 August 2019 13:20 To: [log in to unmask]; Michal Kamil Simon Subject: python chunks and xrdcp streams equivalent? Hi! Is the chunks number (from python bindings) and the -S|--streams from xrdcp the same thing? moreover, will this multiply with the number of sources? so, with chunks=4 and sources=2, there will be 8 download threads (per file)? Thank you! Adrian ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-L list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1