cpc_count_sys_events man page on OpenIndiana

Man page or keyword search:  
man Server   20441 pages
apropos Keyword Search (all sections)
Output format
OpenIndiana logo
[printable version]

cpc_count_usr_evenCPU3Performance Counters Library Fcpc_count_usr_events(3CPC)

NAME
       cpc_count_usr_events, cpc_count_sys_events - enable and disable perfor‐
       mance counters

SYNOPSIS
       cc [ flag... ] file... −lcpc [ library... ]
       #include <libcpc.h>

       int cpc_count_usr_events(int enable);

       int cpc_count_sys_events(int enable);

DESCRIPTION
       In certain applications, it can be useful to explicitly enable and dis‐
       able performance counters at different times so that the performance of
       a critical algorithm can be examined.  The cpc_count_usr_events() func‐
       tion can be used to control whether events are counted on behalf of the
       application running in user mode, while cpc_count_sys_events()  can  be
       used to control whether events are counted on behalf of the application
       while it is running in the kernel,  without  otherwise  disturbing  the
       binding	of  events to the invoking LWP. If the enable argument is non-
       zero, counting of events is enabled, otherwise they are disabled.

RETURN VALUES
       Upon	successful     completion,     cpc_count_usr_events()	   and
       cpc_count_sys_events() return 0. Otherwise, the functions return −1 and
       set errno to indicate the error.

ERRORS
       The cpc_count_usr_events() and  cpc_count_sys_events()  functions  will
       fail if:

       EAGAIN	  The  associated performance counter context has been invali‐
		  dated by another process.

       EINVAL	  No performance counter  context  has	been  created,	or  an
		  attempt  was	made  to enable system events while delivering
		  counter overflow signals.

EXAMPLES
       Example 1 Use cpc_count_usr_events() to minimize code needed by	appli‐
       cation.

       In this example, the routine cpc_count_usr_events() is used to minimize
       the amount of code that needs to be added to the application. The  cpu‐
       track(1)	 command  can  be used in conjunction with these interfaces to
       provide event programming, sampling, and reporting facilities.

       If the application is instrumented in this way and then started by cpu‐
       track  with the nouser flag set in the event specification, counting of
       user events will only be enabled around the critical  code  section  of
       interest.   If the program is run normally, no harm will ensue.

	 int have_counters = 0;
	 int
	 main(int argc, char *argv[])
	 {
	     if (cpc_version(CPC_VER_CURRENT) == CPC_VER_CURRENT &&
		 cpc_getcpuver() != -1 && cpc_access() == 0)
		 have_counters = 1;

	     /* ... other application code */

	     if (have_counters)
		 (void) cpc_count_usr_events(1);

	     /* ==> Code to be measured goes here <== */

	     if (have_counters)
		 (void) cpc_count_usr_events(0);

	     /* ... other application code */
	 }

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

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

SEE ALSO
       cputrack(1),    cpc(3CPC),    cpc_access(3CPC),	 cpc_bind_event(3CPC),
       cpc_enable(3CPC),    cpc_getcpuver(3CPC),    cpc_pctx_bind_event(3CPC),
       cpc_version(3CPC), libcpc(3LIB), attributes(5)

NOTES
       The  cpc_count_usr_events()  and cpc_count_sys_events() functions exist
       for binary compatibility only. Source containing these  functions  will
       not  compile.  These  functions	are obsolete and might be removed in a
       future release. Applications should use cpc_enable(3CPC) instead.

SunOS 5.11			  28 Mar 2005	    cpc_count_usr_events(3CPC)
[top]

List of man pages available for OpenIndiana

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net