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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