PGI User's Guide

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$Intel(R) Math Kernel Library for Linux* OS User's Guide$

Environment VariablesRun-time Library Routines with Examplesomp_unset_lockCauses the calling thread to release ownership of the lock associated with integer_var.If the variable is not already associated with a lock, it is illegal to make a call to this routine.FortranC/C++omp_test_locksubroutine omp_unset_lock(lock)include ‘omp_lib_kinds.h’integer(kind=omp_lock_kind) lock#include void omp_unset_lock(omp_lock_t *lock);void omp_unset_nest_lock(omp_nest_lock_t *lock);Causes the calling thread to try to gain ownership of the lock associated with the variable.The function returns .TRUE.for directives and non-zero for pragmas if the thread gains ownershipof the lock; otherwise it returns .FALSE. for directives and zero for pragmas. If the variable is notalready associated with a lock, it is illegal to make a call to this routine.FortranC/C++logical function omp_test_lock(lock)include ‘omp_lib_kinds.h’integer(kind=omp_lock_kind) lockint omp_test_lock(omp_lock_t *lock);int omp_test_nest_lock(omp_nest_lock_t *lock);Environment VariablesYou can use OpenMP environment variables to control the behavior of OpenMP programs. These environmentvariables allow you to set and pass information that can alter the behavior of directives and pragmas.The following summary table is a quick reference for the OpenMP environment variables that <strong>PGI</strong> uses. Fordetailed descriptions of each of these variables, refer to “OpenMP Environment Variables” chapter of the <strong>PGI</strong>Compiler Reference Manual.Table 5.4. OpenMP-related Environment Variable Summary TableEnvironment Variable Default DescriptionOMP_DYNAMIC FALSE Currently has no effect. Typically enables (TRUE) ordisables (FALSE) the dynamic adjustment of the number ofthreads.OMP_NESTED Currently has no effect. Typically specifies the maximumnumber of nested parallel regions.OMP_MAX_ACTIVE_LEVELS FALSE Currently has no effect. Typically enables (TRUE) ordisables (FALSE) nested parallelism.OMP_NUM_THREADS 1 Specifies the number of threads to use during execution ofparallel regions.70
Chapter 5. Using OpenMPEnvironment Variable Default DescriptionOMP_SCHEDULESTATIC withchunk size of1Specifies the type of iteration scheduling and optionally thechunk size to use for omp for and omp parallel for loopsthat include the run-time schedule clause. The supportedschedule types, which can be specified in upper- or lowercaseare static, dynamic, guided, and auto.OMP_STACKSIZE Overrides the default stack size for a newly created thread.OMP_THREAD_LIMIT 64 Specifies the absolute maximum number of threads that canbe used in a program.OMP_WAIT_POLICY ACTIVE Sets the behavior of idle threads, defining whether they spinor sleep when idle. The values are ACTIVE and PASSIVE.71
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PGI ® Compiler User’s Guide4. Us
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Organizationxvi• Fortran 95 Handb
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Conventionsin this guide with which
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Chapter 1. Getting StartedThis chap
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Page 110 and 111: Accelerator DirectivesAccelerator D
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PGI Environment VariablesLD_LIBRARY
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PGI Environment VariablesNCPUS138Se
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PGI Environment VariablesThe value
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Using Environment Modules on LinuxT
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Deploying Applications on Linux146T
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Compatible Data TypesNoteFortran Ty
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ExamplesCompile and execute the pro
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Examples160int a,b,c;a=8; b=2;print
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Win32 Calling Conventionscout
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Large Static Data in LinuxC/C++ Dat
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Practical Limitations of Large Arra
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Medium Memory Model and Large Array
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Large Array and Small Memory Model
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Extended Inline AssemblyExtended In
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Extended Inline Assemblyexample2:..
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Extended Inline Assembly180movq %rs
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Extended Inline AssemblyConstraintw
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Extended Inline AssemblyConstraintu
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Extended Inline AssemblyConstraintM
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Extended Inline AssemblyModifierDes
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Intrinsicsvoid example21(){void * s
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suboptions, 18syntax, 2, 17Commands
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InstallLinux portability package, 1
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modifier *, 186, 186modifier &, 186
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optimization, 39-tp option, 39UNIXc
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