 |
 |
Just to show you that the thing actually works ... this is a dump from opening of a root file and doing TTree::Draw() on a Double_t branch with 609 baskets: SXrdIoInfo::Dump() N_reqs = 21, N_vec_read_subreqs = 608 0 Read t=1 l=300 o=0 1 Read t=3 l=254 o=57300275 2 Read t=4 l=5407 o=177754 3 Read t=5 l=267776 o=57032704 // Tree draw starts here ... 4 Read t=65 l=5120 o=48640 5 VecRead t=65 l=88998 n_req_cnt= 19 n_reqs_lost= 0 idx=0 6 VecRead t=65 l=90440 n_req_cnt= 23 n_reqs_lost= 0 idx=19 7 VecRead t=66 l=91197 n_req_cnt= 48 n_reqs_lost= 0 idx=42 8 VecRead t=68 l=91680 n_req_cnt= 45 n_reqs_lost= 0 idx=90 9 VecRead t=65 l=91992 n_req_cnt= 39 n_reqs_lost= 0 idx=135 10 VecRead t=67 l=91374 n_req_cnt= 40 n_reqs_lost= 0 idx=174 11 VecRead t=68 l=92347 n_req_cnt= 39 n_reqs_lost= 0 idx=214 12 VecRead t=65 l=90768 n_req_cnt= 37 n_reqs_lost= 0 idx=253 13 VecRead t=67 l=91443 n_req_cnt= 40 n_reqs_lost= 0 idx=290 14 VecRead t=70 l=91500 n_req_cnt= 39 n_reqs_lost= 0 idx=330 15 VecRead t=70 l=92078 n_req_cnt= 43 n_reqs_lost= 0 idx=369 16 VecRead t=72 l=92058 n_req_cnt= 43 n_reqs_lost= 0 idx=412 17 VecRead t=73 l=92447 n_req_cnt= 42 n_reqs_lost= 0 idx=455 18 VecRead t=70 l=91492 n_req_cnt= 41 n_reqs_lost= 0 idx=497 19 VecRead t=72 l=92008 n_req_cnt= 38 n_reqs_lost= 0 idx=538 20 VecRead t=73 l=73012 n_req_cnt= 32 n_reqs_lost= 0 idx=576 On 11/12/12 22:36, Matevz Tadel wrote: > 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 ######################################################################## 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