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Hi Andy Here is some more information on the problem we are seeing at RAL regarding the creation of worker threads. The number of allowed processes on both the redirector and the server is set to 29000 with the max number allowed set to 30000 /afs/slac.stanford.edu/u/br/olaiya/tmp/proc.txt Starting 448 jobs (2 jobs on each batch machine), accessing data via xrootd we start to see the following output in the server log: 041205 02:57:58 24692 XrdScheduler: Unable to create worker thread ; resource temporarily unavailable 041205 02:58:02 24600 XrdScheduler: Unable to create worker thread ; resource temporarily unavailable ( The full log is here: /afs/slac.stanford.edu/u/br/olaiya/tmp/xrdlog.20041205 ) This happens when the number of opens file reaches ~340. At the same time when listing the open files we see some of the connections are flagged with (CLOSE_WAIT). The output of lsof on the server can be found here: /afs/slac.stanford.edu/u/br/olaiya/tmp/server_lsof.txt Is there some other setting I should tweak in order to allow the creation of more worker threads? cheers Manny