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Hi, I'm testing the monitoring collector extension that is capable of storing full access details into a root tree. Running a simple xrdcp I realized that xrdcp first copies data at offset of 8MB and only then the beginning of the file. t ~ time since file open l ~ length of request o ~ offset // file_len=4983779 SXrdIoInfo::Dump() N_reqs = 2, N_vec_read_subreqs = 0 0 Read t=2 l=483 o=4983296 1 Read t=4 l=4983296 o=0 // file_len=9311384 SXrdIoInfo::Dump() N_reqs = 2, N_vec_read_subreqs = 0 0 Read t=2 l=922776 o=8388608 1 Read t=4 l=8388608 o=0 This is even funnier for a larger file (~400MB) ... the first 8MB (offset=0) are read after 238MB are already read, see below, entry 60. What's the secret here? :) Cheers, Matevz // file_len=428002641 SXrdIoInfo::Dump() N_reqs = 102, N_vec_read_subreqs = 0 0 Read t=5 l=4194304 o=8388608 1 Read t=10 l=4194304 o=12582912 2 Read t=20 l=4194304 o=16777216 3 Read t=35 l=4194304 o=20971520 4 Read t=45 l=4194304 o=25165824 5 Read t=55 l=4194304 o=29360128 6 Read t=65 l=4194304 o=33554432 7 Read t=75 l=4194304 o=37748736 8 Read t=85 l=4194304 o=41943040 9 Read t=95 l=4194304 o=46137344 10 Read t=105 l=4194304 o=50331648 11 Read t=115 l=4194304 o=54525952 12 Read t=130 l=4194304 o=58720256 13 Read t=140 l=4194304 o=62914560 14 Read t=155 l=4194304 o=67108864 15 Read t=165 l=4194304 o=71303168 16 Read t=170 l=4194304 o=75497472 17 Read t=180 l=4194304 o=79691776 18 Read t=190 l=4194304 o=83886080 19 Read t=205 l=4194304 o=88080384 20 Read t=215 l=4194304 o=92274688 21 Read t=225 l=4194304 o=96468992 22 Read t=240 l=4194304 o=100663296 23 Read t=255 l=4194304 o=104857600 24 Read t=260 l=4194304 o=109051904 25 Read t=265 l=4194304 o=113246208 26 Read t=275 l=4194304 o=117440512 27 Read t=285 l=4194304 o=121634816 28 Read t=295 l=4194304 o=125829120 29 Read t=305 l=4194304 o=130023424 30 Read t=315 l=4194304 o=134217728 31 Read t=325 l=4194304 o=138412032 32 Read t=335 l=4194304 o=142606336 33 Read t=345 l=4194304 o=146800640 34 Read t=360 l=4194304 o=150994944 35 Read t=370 l=4194304 o=155189248 36 Read t=375 l=4194304 o=159383552 37 Read t=385 l=4194304 o=163577856 38 Read t=390 l=4194304 o=167772160 39 Read t=400 l=4194304 o=171966464 40 Read t=405 l=4194304 o=176160768 41 Read t=420 l=4194304 o=180355072 42 Read t=425 l=4194304 o=184549376 43 Read t=435 l=4194304 o=188743680 44 Read t=445 l=4194304 o=192937984 45 Read t=455 l=4194304 o=197132288 46 Read t=465 l=4194304 o=201326592 47 Read t=475 l=4194304 o=205520896 48 Read t=485 l=4194304 o=209715200 49 Read t=495 l=4194304 o=213909504 50 Read t=505 l=4194304 o=218103808 51 Read t=515 l=4194304 o=222298112 52 Read t=525 l=4194304 o=226492416 53 Read t=535 l=4194304 o=230686720 54 Read t=540 l=4194304 o=234881024 55 Read t=550 l=4194304 o=239075328 56 Read t=560 l=4194304 o=243269632 57 Read t=575 l=4194304 o=247463936 58 Read t=580 l=4194304 o=251658240 59 Read t=590 l=4194304 o=255852544 60 Read t=605 l=8388608 o=0 61 Read t=625 l=4194304 o=260046848 62 Read t=635 l=4194304 o=264241152 63 Read t=645 l=4194304 o=268435456 64 Read t=655 l=4194304 o=272629760 65 Read t=665 l=4194304 o=276824064 66 Read t=675 l=4194304 o=281018368 67 Read t=680 l=4194304 o=285212672 68 Read t=690 l=4194304 o=289406976 69 Read t=695 l=4194304 o=293601280 70 Read t=705 l=4194304 o=297795584 71 Read t=715 l=4194304 o=301989888 72 Read t=730 l=4194304 o=306184192 73 Read t=745 l=4194304 o=310378496 74 Read t=760 l=4194304 o=314572800 75 Read t=770 l=4194304 o=318767104 76 Read t=780 l=4194304 o=322961408 77 Read t=790 l=4194304 o=327155712 78 Read t=800 l=4194304 o=331350016 79 Read t=810 l=4194304 o=335544320 80 Read t=820 l=4194304 o=339738624 81 Read t=825 l=4194304 o=343932928 82 Read t=835 l=4194304 o=348127232 83 Read t=850 l=4194304 o=352321536 84 Read t=855 l=4194304 o=356515840 85 Read t=870 l=4194304 o=360710144 86 Read t=880 l=4194304 o=364904448 87 Read t=895 l=4194304 o=369098752 88 Read t=905 l=4194304 o=373293056 89 Read t=915 l=4194304 o=377487360 90 Read t=925 l=4194304 o=381681664 91 Read t=935 l=4194304 o=385875968 92 Read t=940 l=4194304 o=390070272 93 Read t=950 l=4194304 o=394264576 94 Read t=970 l=4194304 o=398458880 95 Read t=975 l=4194304 o=402653184 96 Read t=985 l=4194304 o=406847488 97 Read t=995 l=4194304 o=411041792 98 Read t=1005 l=4194304 o=415236096 99 Read t=1010 l=4194304 o=419430400 100 Read t=1025 l=4194304 o=423624704 101 Read t=1030 l=183633 o=427819008 ######################################################################## 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