136 lines
8.5 KiB
HTML
136 lines
8.5 KiB
HTML
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<!-- Copyright (C) 2006-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>GNU libgomp: Environment Variables</title>
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<meta name="description" content="GNU libgomp: Environment Variables">
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<meta name="keywords" content="GNU libgomp: Environment Variables">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Library-Index.html#Library-Index" rel="index" title="Library Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="index.html#Top" rel="up" title="Top">
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<link href="OMP_005fCANCELLATION.html#OMP_005fCANCELLATION" rel="next" title="OMP_CANCELLATION">
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<link href="omp_005fget_005fwtime.html#omp_005fget_005fwtime" rel="prev" title="omp_get_wtime">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Environment-Variables"></a>
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<div class="header">
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<p>
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Next: <a href="Enabling-OpenACC.html#Enabling-OpenACC" accesskey="n" rel="next">Enabling OpenACC</a>, Previous: <a href="Runtime-Library-Routines.html#Runtime-Library-Routines" accesskey="p" rel="prev">Runtime Library Routines</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Library-Index.html#Library-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Environment-Variables-1"></a>
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<h2 class="chapter">3 Environment Variables</h2>
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<p>The environment variables which beginning with <code>OMP_</code> are defined by
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section 4 of the OpenMP specification in version 4.5, while those
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beginning with <code>GOMP_</code> are GNU extensions.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="OMP_005fCANCELLATION.html#OMP_005fCANCELLATION" accesskey="1">OMP_CANCELLATION</a>:</td><td> </td><td align="left" valign="top">Set whether cancellation is activated
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OMP_005fDISPLAY_005fENV.html#OMP_005fDISPLAY_005fENV" accesskey="2">OMP_DISPLAY_ENV</a>:</td><td> </td><td align="left" valign="top">Show OpenMP version and environment variables
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OMP_005fDEFAULT_005fDEVICE.html#OMP_005fDEFAULT_005fDEVICE" accesskey="3">OMP_DEFAULT_DEVICE</a>:</td><td> </td><td align="left" valign="top">Set the device used in target regions
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OMP_005fDYNAMIC.html#OMP_005fDYNAMIC" accesskey="4">OMP_DYNAMIC</a>:</td><td> </td><td align="left" valign="top">Dynamic adjustment of threads
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OMP_005fMAX_005fACTIVE_005fLEVELS.html#OMP_005fMAX_005fACTIVE_005fLEVELS" accesskey="5">OMP_MAX_ACTIVE_LEVELS</a>:</td><td> </td><td align="left" valign="top">Set the maximum number of nested parallel regions
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OMP_005fMAX_005fTASK_005fPRIORITY.html#OMP_005fMAX_005fTASK_005fPRIORITY" accesskey="6">OMP_MAX_TASK_PRIORITY</a>:</td><td> </td><td align="left" valign="top">Set the maximum task priority value
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OMP_005fNESTED.html#OMP_005fNESTED" accesskey="7">OMP_NESTED</a>:</td><td> </td><td align="left" valign="top">Nested parallel regions
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OMP_005fNUM_005fTHREADS.html#OMP_005fNUM_005fTHREADS" accesskey="8">OMP_NUM_THREADS</a>:</td><td> </td><td align="left" valign="top">Specifies the number of threads to use
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OMP_005fPROC_005fBIND.html#OMP_005fPROC_005fBIND" accesskey="9">OMP_PROC_BIND</a>:</td><td> </td><td align="left" valign="top">Whether theads may be moved between CPUs
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OMP_005fPLACES.html#OMP_005fPLACES">OMP_PLACES</a>:</td><td> </td><td align="left" valign="top">Specifies on which CPUs the theads should be placed
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OMP_005fSTACKSIZE.html#OMP_005fSTACKSIZE">OMP_STACKSIZE</a>:</td><td> </td><td align="left" valign="top">Set default thread stack size
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OMP_005fSCHEDULE.html#OMP_005fSCHEDULE">OMP_SCHEDULE</a>:</td><td> </td><td align="left" valign="top">How threads are scheduled
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OMP_005fTHREAD_005fLIMIT.html#OMP_005fTHREAD_005fLIMIT">OMP_THREAD_LIMIT</a>:</td><td> </td><td align="left" valign="top">Set the maximum number of threads
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OMP_005fWAIT_005fPOLICY.html#OMP_005fWAIT_005fPOLICY">OMP_WAIT_POLICY</a>:</td><td> </td><td align="left" valign="top">How waiting threads are handled
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</td></tr>
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<tr><td align="left" valign="top">• <a href="GOMP_005fCPU_005fAFFINITY.html#GOMP_005fCPU_005fAFFINITY">GOMP_CPU_AFFINITY</a>:</td><td> </td><td align="left" valign="top">Bind threads to specific CPUs
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</td></tr>
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<tr><td align="left" valign="top">• <a href="GOMP_005fDEBUG.html#GOMP_005fDEBUG">GOMP_DEBUG</a>:</td><td> </td><td align="left" valign="top">Enable debugging output
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</td></tr>
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<tr><td align="left" valign="top">• <a href="GOMP_005fSTACKSIZE.html#GOMP_005fSTACKSIZE">GOMP_STACKSIZE</a>:</td><td> </td><td align="left" valign="top">Set default thread stack size
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</td></tr>
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<tr><td align="left" valign="top">• <a href="GOMP_005fSPINCOUNT.html#GOMP_005fSPINCOUNT">GOMP_SPINCOUNT</a>:</td><td> </td><td align="left" valign="top">Set the busy-wait spin count
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</td></tr>
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<tr><td align="left" valign="top">• <a href="GOMP_005fRTEMS_005fTHREAD_005fPOOLS.html#GOMP_005fRTEMS_005fTHREAD_005fPOOLS">GOMP_RTEMS_THREAD_POOLS</a>:</td><td> </td><td align="left" valign="top">Set the RTEMS specific thread pools
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</td></tr>
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</table>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Enabling-OpenACC.html#Enabling-OpenACC" accesskey="n" rel="next">Enabling OpenACC</a>, Previous: <a href="Runtime-Library-Routines.html#Runtime-Library-Routines" accesskey="p" rel="prev">Runtime Library Routines</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Library-Index.html#Library-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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