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| <a name="Environment-Variables"></a> |
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| <a name="Environment-Variables-1"></a> |
| <h2 class="chapter">3 Environment Variables</h2> |
| |
| <p>The environment variables which beginning with <code>OMP_</code> are defined by |
| section 4 of the OpenMP specification in version 4.0, while those |
| beginning with <code>GOMP_</code> are GNU extensions. |
| </p> |
| <table class="menu" border="0" cellspacing="0"> |
| <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 |
| </td></tr> |
| <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 |
| </td></tr> |
| <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 |
| </td></tr> |
| <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 |
| </td></tr> |
| <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 |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="OMP_005fNESTED.html#OMP_005fNESTED" accesskey="6">OMP_NESTED</a>:</td><td> </td><td align="left" valign="top">Nested parallel regions |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="OMP_005fNUM_005fTHREADS.html#OMP_005fNUM_005fTHREADS" accesskey="7">OMP_NUM_THREADS</a>:</td><td> </td><td align="left" valign="top">Specifies the number of threads to use |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="OMP_005fPROC_005fBIND.html#OMP_005fPROC_005fBIND" accesskey="8">OMP_PROC_BIND</a>:</td><td> </td><td align="left" valign="top">Whether theads may be moved between CPUs |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="OMP_005fPLACES.html#OMP_005fPLACES" accesskey="9">OMP_PLACES</a>:</td><td> </td><td align="left" valign="top">Specifies on which CPUs the theads should be placed |
| </td></tr> |
| <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 |
| </td></tr> |
| <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 |
| </td></tr> |
| <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 |
| </td></tr> |
| <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 |
| </td></tr> |
| <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 |
| </td></tr> |
| <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 |
| </td></tr> |
| <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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