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LEARN ABOUT HPUX

lcpu_attr

lcpu_attr(5)							File Formats Manual						      lcpu_attr(5)

NAME

       lcpu_attr - dynamically enable or disable LCPU attribute of the default processor set

VALUES

   Fail Safe
   Default
       the LCPU attribute of the default processor set is disabled

   Allowed values
       or

DESCRIPTION

       This  tunable  dynamically  enables or disables the logical processor (LCPU) attribute in the default processor set.  On systems supporting
       hyper-threading technology, each hyper-thread is represented as an LCPU.

       When the LCPU attribute is enabled, the processor cores in the default processor have hyper-threading enabled.  If the  LCPU  attribute	is
       disabled, the physical processors in the default processor set behave as single threaded processor cores.

       See pset_setattr(2) for information about managing the LCPU attribute in processor sets other than the default processor set.

   Who Is Expected to Change This Tunable?
       System administrators that wish to change hyper-threading ability in the default processor set.

   Restrictions on Changing
       The tunable has no effect on platforms that do not have hyper-threading capability or systems with hyper-threading disabled at the firmware
       level.  On systems that support hyper-threading, the firmware feature must be enabled to dynamically enable/disable the LCPU  attribute	in
       the default processor set.

   When Should the Tunable Be Turned On?
       The  tunable  should  be  turned on to enable the LCPU attribute in the default processor set to take advantage of hyper-threading.  If the
       applications running on the system see performance benefits, the LCPU attribute should remain enabled.

   What Are the Side Effects of Turning the Tunable On?
       Some workloads may experience performance degradation when the LCPU attribute is enabled.

   When Should the Tunable Be Turned Off?
       Some applications may experience performance degradation or may not see any performance benefits from using hyper-threading.  In this case,
       this tunable should be turned off.

   What Are the Side Effects of Turning the Tunable Off?
       With LCPU turned off, applications may not take advantage of hyper-threading.

   What Other Tunables Should Be Changed at the Same Time?
       None.

WARNINGS

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

SEE ALSO

       psrset(1M), pset_assign(2), pset_bind(2), pset_create(2), pset_ctl(2), pset_destroy(2), privgrp(4).

							     Tunable Kernel Parameters						      lcpu_attr(5)