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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);
The lgrp_latency_cookie() function takes a cookie representing a snapshot 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.
Upon successful completion, the latency value is returned. Otherwise -1 is returned and errno is set to indicate the error.
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.
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
lgrp_init(3LGRP), lgrp_parents(3LGRP), lgrp_children(3LGRP), liblgrp(3LIB), attributes(5)
26 Jan 2005 lgrp_latency(3LGRP)