|
Quick Lists
|
|
Bug ID:
|
6547163
|
|
Votes
|
0
|
|
Synopsis
|
6498658 changes introduced regression in arraycopy on sparc
|
|
Category
|
hotspot:compiler2
|
|
Reported Against
|
|
|
Release Fixed
|
hs10(b13),
6u2(b03) (Bug ID:2148621)
, 7(b13) (Bug ID:2176927)
|
|
State
|
10-Fix Delivered,
bug
|
|
Priority:
|
2-High
|
|
Related Bugs
|
6498658
,
6563987
|
|
Submit Date
|
18-APR-2007
|
|
Description
|
6498658 changes introduced regression in arraycopy on sparc (32-bits VM)
when the copy offsets statically known constants which have heapWordSize mod
values (4 bytes in 32-bits VM) and offset's difference is not 8 bytes mod:
20070214101449.sgoldman.6524971
jaberwocky% gamma -Xbatch ArrayCopyTest5
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 122
Time to copy 64 chars (128 bytes): 134
Time to copy 32 ints (128 bytes): 125
Time to copy 32 oops (128 bytes): 134
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 124
Time to copy 64 chars (128 bytes): 98
Time to copy 32 ints (128 bytes): 103
Time to copy 32 oops (128 bytes): 110
Time to copy 16 longs (128 bytes): 87
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 117
Time to copy 64 chars (128 bytes): 103
Time to copy 32 ints (128 bytes): 100
Time to copy 32 oops (128 bytes): 109
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 103
Time to copy 64 chars (128 bytes): 72
Time to copy 32 ints (128 bytes): 77
Time to copy 32 oops (128 bytes): 86
Time to copy 16 longs (128 bytes): 62
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 89
Time to copy 64 chars (128 bytes): 99
Time to copy 32 ints (128 bytes): 108
Time to copy 32 oops (128 bytes): 96
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 90
Time to copy 64 chars (128 bytes): 65
Time to copy 32 ints (128 bytes): 65
Time to copy 32 oops (128 bytes): 78
Time to copy 16 longs (128 bytes): 55
20070214151808.kvn.6498658
jaberwocky% gamma -Xbatch ArrayCopyTest5
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 18451
Time to copy 64 chars (128 bytes): 18401
Time to copy 32 ints (128 bytes): 17089
Time to copy 32 oops (128 bytes): 17070
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 81
Time to copy 64 chars (128 bytes): 80
Time to copy 32 ints (128 bytes): 81
Time to copy 32 oops (128 bytes): 80
Time to copy 16 longs (128 bytes): 68
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 18694
Time to copy 64 chars (128 bytes): 18658
Time to copy 32 ints (128 bytes): 17317
Time to copy 32 oops (128 bytes): 17259
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 57
Time to copy 64 chars (128 bytes): 54
Time to copy 32 ints (128 bytes): 54
Time to copy 32 oops (128 bytes): 60
Time to copy 16 longs (128 bytes): 43
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 18660
Time to copy 64 chars (128 bytes): 18573
Time to copy 32 ints (128 bytes): 17239
Time to copy 32 oops (128 bytes): 17221
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 53
Time to copy 64 chars (128 bytes): 47
Time to copy 32 ints (128 bytes): 45
Time to copy 32 oops (128 bytes): 46
Time to copy 16 longs (128 bytes): 35
Fixed VM
jaberwocky% gamma -Xbatch ArrayCopyTest5
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 98
Time to copy 64 chars (128 bytes): 87
Time to copy 32 ints (128 bytes): 89
Time to copy 32 oops (128 bytes): 93
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 80
Time to copy 64 chars (128 bytes): 73
Time to copy 32 ints (128 bytes): 79
Time to copy 32 oops (128 bytes): 78
Time to copy 16 longs (128 bytes): 67
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 84
Time to copy 64 chars (128 bytes): 67
Time to copy 32 ints (128 bytes): 65
Time to copy 32 oops (128 bytes): 68
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 55
Time to copy 64 chars (128 bytes): 49
Time to copy 32 ints (128 bytes): 54
Time to copy 32 oops (128 bytes): 52
Time to copy 16 longs (128 bytes): 41
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 59
Time to copy 64 chars (128 bytes): 55
Time to copy 32 ints (128 bytes): 55
Time to copy 32 oops (128 bytes): 62
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 50
Time to copy 64 chars (128 bytes): 49
Time to copy 32 ints (128 bytes): 42
Time to copy 32 oops (128 bytes): 51
Time to copy 16 longs (128 bytes): 35
64-bits VM is fine since heapWordSize is 8 bytes:
20070214101449.sgoldman.6524971
jaberwocky% gamma -Xbatch ArrayCopyTest5
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 135
Time to copy 64 chars (128 bytes): 142
Time to copy 32 ints (128 bytes): 133
Time to copy 32 oops (128 bytes): 145
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 135
Time to copy 64 chars (128 bytes): 110
Time to copy 32 ints (128 bytes): 111
Time to copy 32 oops (128 bytes): 145
Time to copy 16 longs (128 bytes): 91
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 126
Time to copy 64 chars (128 bytes): 115
Time to copy 32 ints (128 bytes): 110
Time to copy 32 oops (128 bytes): 118
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 112
Time to copy 64 chars (128 bytes): 82
Time to copy 32 ints (128 bytes): 85
Time to copy 32 oops (128 bytes): 118
Time to copy 16 longs (128 bytes): 68
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 101
Time to copy 64 chars (128 bytes): 108
Time to copy 32 ints (128 bytes): 112
Time to copy 32 oops (128 bytes): 113
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 103
Time to copy 64 chars (128 bytes): 77
Time to copy 32 ints (128 bytes): 72
Time to copy 32 oops (128 bytes): 106
Time to copy 16 longs (128 bytes): 60
20070214151808.kvn.6498658
jaberwocky% gamma -Xbatch ArrayCopyTest5
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 99
Time to copy 64 chars (128 bytes): 107
Time to copy 32 ints (128 bytes): 98
Time to copy 32 oops (128 bytes): 134
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 78
Time to copy 64 chars (128 bytes): 84
Time to copy 32 ints (128 bytes): 84
Time to copy 32 oops (128 bytes): 134
Time to copy 16 longs (128 bytes): 76
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 91
Time to copy 64 chars (128 bytes): 81
Time to copy 32 ints (128 bytes): 72
Time to copy 32 oops (128 bytes): 106
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 53
Time to copy 64 chars (128 bytes): 60
Time to copy 32 ints (128 bytes): 59
Time to copy 32 oops (128 bytes): 112
Time to copy 16 longs (128 bytes): 50
Disjoint +4 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 71
Time to copy 64 chars (128 bytes): 70
Time to copy 32 ints (128 bytes): 66
Time to copy 32 oops (128 bytes): 96
Disjoint +8 bytes offset small arraycopy:
Time to copy 128 bytes (128 bytes): 46
Time to copy 64 chars (128 bytes): 52
Time to copy 32 ints (128 bytes): 46
Time to copy 32 oops (128 bytes): 101
Time to copy 16 longs (128 bytes): 43
Posted Date : 2007-04-18 00:26:36.0
|
|
Work Around
|
N/A
|
|
Evaluation
|
The aligned arraycopy stubs are called when the copy offsets statically known constants
which have heapWordSize mod values (4 bytes in 32-bits VM).
In aligned arraycopy stubs only destination address was checked and aligned to 8 bytes
causing the execution of ldx/stx instructions on address not aligned to 8 bytes.
Which causes HW traps on each instruction.
Posted Date : 2007-04-18 00:26:36.0
|
|
Comments
|
PLEASE NOTE: JDK6 is formerly known as Project Mustang
|
|
|
|
