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Cray Standard C/C++ Reference Manual
and can cause loops inside and outside parallel regions to not vectorize. Avoid
shared stack variables, where possible, because of this problem.
3.8.13.2 Context Arguments
The following tasking directive arguments are used to indicate the tasking
context for variables referenced in the parallel region. Tasking context is an
attribute that determines how the different processors access a variable in a
parallel region.
If the private, shared,orvalue argument is used, at least one variable must
be declared in the corresponding list. For these arguments, variable names follow
the argument in a comma-separated list enclosed in parentheses.
A
rgument Description
private The private argument indicates those variables
in the parallel region that are to have private
context.
shared The shared argument indicates those variables in
the parallel region that are to have shared context.
value The value argument indicates those variables in
the parallel region that are to have value context;
that is, each task has its own initialized private
copy of these variables.
defaults The defaults argument indicates that all
variables referenced in the parallel region but not
listed in the private, shared,orvalue lists
are to have their tasking context determined by
using the default rules. The private, shared,
and value arguments can be used in conjunction
with the defaults argument to override the
default rules for specified variables.
3.8.13.3 Work Distribution Arguments
The following arguments specify the work distribution policy for the iterations of
a tasked loop and can be used only with the taskloop directive.
When no explicit scheduling policy is specified, the compiler is free to choose
an appropriate work distribution. A loop that is both tasked and vectorized is
scheduled with a sufficiently large chunking factor to allow efficient vector
execution.
82 S–2179–36
- Cray Standard C/C++ Reference 1
- New Features 3
- Record of Revision 5
- S–2179–36 v 9
- Directives [3] 45 11
- Cray Standard C++ [4] 103 13
- Predefined Macros [7] 117 14
- Contents 15
- S–2179–36 xi 15
- S–2179–36 xiii 17
- Related Publications 18
- Ordering Documentation 19
- Conventions 19
- Reader Comments 20
- Introduction [1] 21
- 2 S–2179–36 22
- Compiler Commands [2] 23
- 2.1 CC Command 24
- 2.2 cc Command 24
- S–2179–36 5 25
- 2.3 Command Line Options 26
- S–2179–36 7 27
- CC -O3 -h vector2 myfile.c 28
- 8 S–2179–36 28
- S–2179–36 9 29
- 10 S–2179–36 30
- 2.5 Template Language Options 32
- 2.6 Virtual Functions Options 33
- 2.7 General Language Options 34
- S–2179–36 15 35
- 16 S–2179–36 36
- S–2179–36 17 37
- 18 S–2179–36 38
- S–2179–36 19 39
- 20 S–2179–36 40
- S–2179–36 21 41
- 22 S–2179–36 42
- S–2179–36 23 43
- 24 S–2179–36 44
- S–2179–36 25 45
- 2.15 Math Options 46
- S–2179–36 27 47
- 2.16 Analysis Tool Options 48
- 2.17 Debugging Options 49
- 2.18 Compiler Message Options 50
- -h nomessage=174:9 51
- S–2179–36 31 51
- 32 S–2179–36 52
- S–2179–36 33 53
- 34 S–2179–36 54
- 2.20 Preprocessing Options 55
- 36 S–2179–36 56
- S–2179–36 37 57
- 2.21 Loader Options 58
- S–2179–36 39 59
- 2.22 Miscellaneous Options 60
- 2.23 Command Line Examples 62
- 2.24 Environment Variables 63
- 44 S–2179–36 64
- #pragma Directives [3] 65
- 3.1 Protecting Directives 66
- 3.3 Loop Directives 66
- 3.5 General Directives 68
- S–2179–36 55 75
- 3.6 Instantiation Directives 77
- 3.7 Vectorization Directives 77
- 3.8 Tasking Directives 82
- S–2179–36 63 83
- 64 S–2179–36 84
- __tsk_name_nnn 85
- S–2179–36 65 85
- 66 S–2179–36 86
- S–2179–36 67 87
- 70 S–2179–36 90
- 80 S–2179–36 100
- Directives [3] 101
- S–2179–36 81 101
- 82 S–2179–36 102
- S–2179–36 83 103
- S–2179–36 85 105
- 3.10 Scalar Directives 106
- S–2179–36 87 107
- 88 S–2179–36 108
- S–2179–36 89 109
- S–2179–36 91 111
- 92 S–2179–36 112
- S–2179–36 97 117
- 98 S–2179–36 118
- 3.11 Inlining Directives 120
- Cray Standard C++ [4] 123
- 104 S–2179–36 124
- 5.1 Complex Data Extensions 125
- 5.2 fortran Keyword 126
- S–2179–36 109 129
- 6.1 Automatic Instantiation 130
- S–2179–36 111 131
- 6.2 Instantiation Modes 133
- 114 S–2179–36 134
- 6.5 Implicit Inclusion 136
- Predefined Macros [7] 137
- 118 S–2179–36 138
- S–2179–36 119 139
- 8.1 Cray TotalView Debugger 141
- 122 S–2179–36 142
- S–2179–36 123 143
- 126 S–2179–36 146
- S–2179–36 127 147
- 128 S–2179–36 148
- S–2179–36 129 149
- Cray Standard C main program: 150
- 134 S–2179–36 154
- S–2179–36 135 155
- Cray Standard C++ program: 156
- S–2179–36 139 159
- S–2179–36 141 161
- 144 S–2179–36 164
- S–2179–36 145 165
- 146 S–2179–36 166
- S–2179–36 147 167
- 148 S–2179–36 168
- S–2179–36 149 169
- 150 S–2179–36 170
- 152 S–2179–36 172
- Libraries and Loaders [A] 173
- 154 S–2179–36 174
- S–2179–36 155 175
- B.1 C++ Conformance 177
- 158 S–2179–36 178
- S–2179–36 159 179
- 160 S–2179–36 180
- B.2 C++ Anachronisms Accepted 181
- 164 S–2179–36 184
- S–2179–36 171 191
- Compiler Messages [C] 193
- 174 S–2179–36 194
- C.3 Message Severity 195
- C.4 Common System Messages 196
- S–2179–36 177 197
- Intrinsic Functions [D] 199
- Cray SV1 series only 201
- S–2179–36 181 201
- S–2179–36 183 203
- 184 S–2179–36 204
- S–2179–36 185 205
- 186 S–2179–36 206
- S–2179–36 187 207
- 188 S–2179–36 208
- S–2179–36 189 209
- 190 S–2179–36 210
- S–2179–36 191 211
- 192 S–2179–36 212
- S–2179–36 193 213
- 194 S–2179–36 214
- S–2179–36 195 215
- 196 S–2179–36 216
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