Option Type | Default Value | #pragma options | C | C++ |
-qoption | nosmp | - | x |
Syntax
-qnosmp | -qsmp[=suboption[:suboption] [ ... ]]
Purpose
Specifies if and how parallelized object code is generated, according to suboption(s)
specified:
Suboption | Description | ||
auto noauto |
Enables or disables automatic parallelization. auto is the default if -qsmp is specified without the omp suboption. Otherwise, the default is noauto. |
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explicit noexplicit |
Enables or disables pragmas controlling explicit parallelization of
countable loops. explicit is the default. If noexplicit is in effect, #pragma ibm omp parallel_loop is not honored by the compiler. |
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nested_par nonested_par |
Enables or disables parallelization of nested parallel constructs. nonested_par is the default. If one parallel construct is run as part of another parallel construct, the execution of the nested construct is serialized by the compiler for better performance. If nested_par is in effect, nested parallel constructs are not serialized.
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omp noomp |
Enables or disables strict compliance with OpenMP C and C++ API
specifications. noomp is the default. This mode allows for maximum program parallelization, but may not be completely compliant to the OpenMP API specification. If you specify the omp suboption, the compiler disables automatic parallelization and warns of directives that are not OpenMP-compliant. The _OPENMP macro is defined. Certain other smp suboptions enable compiler parallelization features that do not comply with the OpenMP specification. If they are specified together with the omp suboption, a warning message issued. These suboptions are:
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rec_locks norec_locks |
Specifies whether recursive locks are used to implement critical
sections. If rec_locks is in effect, recursive locks are used, and nested critical sections will not cause a deadlock. The default is norec_locks, or regular locks. |
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schedule=sched_type[=n] |
Specifies what kind of scheduling algorithms and chunking are used for
loops to which no other scheduling algorithm has been explicitly assigned in the source
code. Valid options for sched_type are:
If sched_type is not specified, runtime is assumed as the default setting. For more information about these scheduling algorithms, see schedule pragma. |
Notes
Program Parallelization
Control Parallel Processing with Pragmas
List of Batch Compiler Options and Their Defaults
Options that Define the Compiler Object Code Produced
#pragma Preprocessor Directives for Parallel Processing
Run-time Options for Parallel Processing
Built-in Functions Used for Parallel Processing
-O Optimize Option
-qthreaded Option
Equivalent Batch Compile-Link and Incremental
Build Options