Understanding How Intel Speedstep® Technology and Intel® Hyper-Threading Technology Are Verified by Intel® Cluster Checker

Intel Speedstep® Technology and Intel® Hyper-Threading Technology settings can impact the overall performance of a cluster.  Intel® Cluster Checker verifies these settings in the speedstep and core_count checks, respectively. 

For the Intel® Xeon® processor 5500 series and later, by default, the core_count check verifies that Intel® Hyper-Threading Technology is enabled.  On earlier processors, the default core_count behavior is to verify that Intel® Hyper-Threading Technology is disabled.  For any processor, the state to be verified can be configured.  For example, to always verify that Intel® Hyper-Threading Technology is enabled:

<core_count>
  <hyper-threading>on</hyper-threading>
</core_count>

By default, Intel® Cluster Checker verifies that Intel Speedstep® Technology is disabled.  The speedstep check can be configured to verify either state.  For example, to verify that Intel Speedstep® Techology is enabled:

<speedstep>
  <state>on</state>
</speedstep>

Note:  Refer to the documentation provided by your hardware vendor for more information on how to enable or disable Intel Speedstep® Technology or Intel® Hyper-Threading Technology.
For more complete information about compiler optimizations, see our Optimization Notice.