lgrp_latency_cookie man page on SmartOS

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LGRP_LATENCY(3LGRP)					   LGRP_LATENCY(3LGRP)

NAME
       lgrp_latency, lgrp_latency_cookie - get latency between two lgroups

SYNOPSIS
       cc [ flag... ] file... -llgrp [ library... ]
       #include <sys/lgrp_user.h>

       int lgrp_latency_cookie(lgrp_cookie_t cookie, lgrp_id_t from,
	    lgrp_id_t to, lgrp_lat_between_t between);

       int lgrp_latency(lgrp_id_t from, lgrp_id_t to);

DESCRIPTION
       The  lgrp_latency_cookie() function takes a cookie representing a snap‐
       shot of the lgroup hierarchy obtained from lgrp_init(3LGRP) and returns
       the  latency  value between a hardware resource in the from lgroup to a
       hardware resource in the to lgroup. If from is the same lgroup  as  to,
       the latency value within that lgroup is returned.

       The  between  argument  should be set to the following value to specify
       between which hardware resources the latency should be measured:

	 LGRP_LAT_CPU_TO_MEM	 /* latency from CPU to memory */

       The latency value is defined by the operating system and	 is  platform-
       specific.   It  can  be used only for relative comparison of lgroups on
       the running system.  It	does  not  necessarily	represent  the	actual
       latency between hardware devices, and it might not be applicable across
       platforms.

       The lgrp_latency() function is similiar	to  the	 lgrp_latency_cookie()
       function,  but  returns	the  latency  between the given lgroups at the
       given instant in time. Since lgroups can be freed and reallocated, this
       function might not be able to provide a consistent answer across calls.
       For that reason, the lgrp_latency_cookie() function should be  used  in
       its place.

RETURN VALUES
       Upon successful completion, the latency value is returned. Otherwise −1
       is returned and errno is set to indicate the error.

ERRORS
       The lgrp_latency_cookie() and lgrp_latency() functions will fail if:

       EINVAL
		 The specified cookie, lgroup  ID,  or	value  given  for  the
		 between argument is not valid.

       ESRCH
		 The  specified	 lgroup ID was not found, the from lgroup does
		 not contain any CPUs, or the to lgroup does not have any mem‐
		 ory.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌────────────────────┬─────────────────┐
       │  ATTRIBUTE TYPE    │ ATTRIBUTE VALUE │
       ├────────────────────┼─────────────────┤
       │Interface Stability │ Evolving	      │
       ├────────────────────┼─────────────────┤
       │MT-Level	    │ MT-Safe	      │
       └────────────────────┴─────────────────┘

SEE ALSO
       lgrp_init(3LGRP),       lgrp_parents(3LGRP),	 lgrp_children(3LGRP),
       liblgrp(3LIB), attributes(5)

				 Jan 26, 2005		   LGRP_LATENCY(3LGRP)
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