Cray CX1000 Guía de usuario Pagina 118
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Cray XMT™ Programming Environment User’s Guide
However, when you add the may merge option these two loops
remain in the same region:
| for (int i = 0; i < size_foobar; i++) {
3 P | bar[i] = size_foobar - i;
|}
|
| #pragma mta max 50 streams per processor may merge
| for (int i = 0; i < size_foobar; i++) {
5 P | foo[i] += bar[i+c]/2;
|}
...
Parallel region 1 in main
Using max 50 streams per processor
...
Loop 2 in main in region 1
...
Loop 3 in main at line 4 in loop 2
...
Loop 4 in main in region 1
...
Loop 5 in main at line 9 in loop 4
Note that the compiler has placed both loops into the same region
and that the stream limit was applied to the entire region. If multiple
limits are specified for the same region the compiler uses the smallest
limit.
Two restrictions apply to the use of this pragma:
• You cannot use this pragma with loop future loops.
• If this pragma is used within the same region as a use n
streams pragma with a conflicting value (for example a use
value that is higher than the max value) the max n streams
per processor pragma will take precedence over the use n
streams pragma.
118 S–2479–20
- S–2479–20 1
- Changes to this Document 5
- Compiler Overview [7] 75 8
- S–2479–20 9 9
- Glossary 167 10
- Procedures 10
- Examples 10
- Contents 11
- S–2479–20 11 11
- Introduction [1] 13
- 14 S–2479–20 14
- 2.1 Setting Up a Secure Shell 15
- 2.1.2 Additional Information 16
- 2.2 Using Modules 17
- 2.2.3 Module Commands 18
- Developing an Application [3] 19
- 3.2.1 Generic Functions 20
- S–2479–20 21 21
- 22 S–2479–20 22
- S–2479–20 23 23
- 3.2.2 Intrinsic Functions 24
- 3.3.2 Avoiding Deadlock 25
- 30 S–2479–20 30
- 3.5.2 Anonymous futures 34
- 3.7 File I/O 36
- 3.7.2 System-level I/O 39
- S–2479–20 43 43
- 44 S–2479–20 44
- 3.9 Debugging the Program 45
- 46 S–2479–20 46
- 48 S–2479–20 48
- 4.2 Persisting Shared Memory 49
- 52 S–2479–20 52
- S–2479–20 53 53
- 54 S–2479–20 54
- S–2479–20 55 55
- 56 S–2479–20 56
- 5.5 LUC Client/Server Example 60
- 5.6 Fast I/O Memory Usage 65
- 66 S–2479–20 66
- Library [6] 67
- a file at which to 68
- a file from which to 68
- in the file, a pointer 69
- 70 S–2479–20 70
- 6.4 Examples 71
- 74 S–2479–20 74
- Compiler Overview [7] 75
- 7.1 The Compilation Process 76
- S–2479–20 77 77
- Whole-program Compilation 78
- Separate-module Compilation 78
- S–2479–20 79 79
- 7.2 Invoking the Compiler 80
- 7.3 Setting the Compiler Mode 80
- 7.3.1 Whole-program Mode 81
- 7.3.2 Separate-module Mode 82
- 7.3.3 Mixed Mode 83
- 7.4 Inlining Functions 84
- S–2479–20 85 85
- 86 S–2479–20 86
- 7.7 Creating New Libraries 87
- 7.8 Compiler Messages 88
- #define NUMSTREAMS 40 89
- S–2479–20 89 89
- 90 S–2479–20 90
- Running an Application [8] 91
- 8.3 Improving Performance 93
- 94 S–2479–20 94
- Optional Optimizations [9] 95
- 100 S–2479–20 100
- Error Messages [A] 101
- S–2479–20 101 101
- 102 S–2479–20 102
- User Runtime Functions [B] 103
- 104 S–2479–20 104
- S–2479–20 105 105
- 106 S–2479–20 106
- S–2479–20 107 107
- 108 S–2479–20 108
- C.1 Compilation Directives 109
- 110 S–2479–20 110
- 114 S–2479–20 114
- S–2479–20 115 115
- S–2479–20 119 119
- S–2479–20 121 121
- 124 S–2479–20 124
- C.3 Semantic Assertions 125
- 126 S–2479–20 126
- C.4 Implementation Hints 130
- S–2479–20 131 131
- 132 S–2479–20 132
- Condition Codes [D] 133
- 134 S–2479–20 134
- S–2479–20 135 135
- 136 S–2479–20 136
- Data Types [E] 137
- 138 S–2479–20 138
- Keywords [F] 139
- 140 S–2479–20 140
- S–2479–20 141 141
- 142 S–2479–20 142
- MTA_PARAMS [G] 143
- 144 S–2479–20 144
- S–2479–20 145 145
- 146 S–2479–20 146
- LUC API Reference [H] 147
- H.3 LUC Methods 149
- H.3.2 stopService Method 150
- H.3.3 getMyEndpointID Method 150
- H.3.4 remoteCall Method 151
- 152 S–2479–20 152
- H.3.5 remoteCallSync Method 153
- 154 S–2479–20 154
- H.3.7 setConfigValue Method 155
- 156 S–2479–20 156
- S–2479–20 157 157
- H.3.8 getConfigValue Method 158
- H.4 LUC Type Definitions 159
- H.5 LUC Callback Functions 160
- S–2479–20 161 161
- H.6 LUC Return Codes 162
- S–2479–20 163 163
- 164 S–2479–20 164
- S–2479–20 165 165
- 166 S–2479–20 166
- Glossary 167
- 168 S–2479–20 168
- S–2479–20 169 169
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