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
>
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