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ECADMIN(1)							    ECADMIN(1)


NAME    [Toc]    [Back]

     ecadmin - configure and control the global	event counters

SYNOPSIS    [Toc]    [Back]

     ecadmin [-aDlMrT] [-d event[,event...]]  [-e event[,event...]]

DESCRIPTION    [Toc]    [Back]

     ecadmin may be used on systems with MIPS R1x000 processors	to configure
     the global	event counters maintained by IRIX using	the underlying
     hardware event counter mechanisms.	 The global event counters are
     maintained	on a system-wide basis,	aggregated over	all processes and for
     all user and system mode execution.

     The event arguments identify hardware-specific event counters.  These may
     be	either integers	or mnemonic, case-insensitive names.  In conjunction
     with the -e option, a single event	specification of ? (with appropriate
     shell escape) will	cause ecadmin to list all known	event counters,	and
     then exit.

     The normal	usage would be to enable global	event counters with ecadmin
     and then to monitor the event counters with ecstats(1) or the Performance
     Co-Pilot tools.

     The options to ecadmin are	as follows;

     -a	  Enable all event counters; this is an	abbreviation for using -e with
	  all of the possible event counters enumerated, or -e * (with
	  appropriate shell escape).

     -D	  Turn on diagnostic output associated with the	control	operations.

     -d	  Disable event	counting for the nominated event counters.

     -e	  Enable event counting	for the	nominated event	counters.

     -l	  List all event counters for which counting is	currently enabled.

     -M	  By default, event counting is	not currently supported	for systems
	  with a mixture of R1x000 processors,	i.e. R10000 and	R12000 or
	  R10000 and R14000. The -M flag relaxes this restriction and allows
	  control for the subset of the	event counters that have the same
	  interpretation across	all processor types.  This option but should
	  only be used in controlled execution environments where the
	  integrity of the event counter values	aggregated across processor
	  types	can be guaranteed.  Great care should be be exercised when
	  interpreting the counter values under	these circumstances.

     -r	  Disable (and release the allocation for) all global event counters.

     -T	  The -T (or ``trust me'') flag	disables the semantic checks for
	  combinations of event	counters are normally not allowed on systems
	  with mixtures	of processors of different type	and/or revision.



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ECADMIN(1)							    ECADMIN(1)



	  Extreme care should be used with the -T flag,	as the reported	event
	  counter values maybe meaningless unless the execution	environment is
	  very tightly controlled.  To have the	desired	effect,	-T may require
	  the concurrent specification of the -M flag.

     If	the operation is completed without errors, ecadmin has an exit status
     of	zero.

CAVEATS    [Toc]    [Back]

     The underlying hardware event counters are	a finite resource, to be
     shared amongst multiple competing uses.

     If	there is any concurrent	use of the process-based event counters	via
     either perfex(1) or the counter-based SpeedShop profiling tools, then
     attempts to manipulate the	global event counters via ecadmin will not
     succeed.  Processes using the process-based event counters	can be
     identified	with ecfind(1).

     If	global event counting is enabled via ecadmin then this will augment
     any concurrent use	resulting from an earlier use of ecadmin.

     Once any global event counters have been enabled with ecadmin, then any
     future attempts to	use either perfex(1) or	the counter-based SpeedShop
     profiling tools will be unsuccessful, until all global event counters are
     released, either with -r or by disabling all active counters via -d.

     For this reason, the user of ecadmin must be root to use any option other
     than -l or	-e ?.

     Depending on the revision of the MIPS R10000 CPUs there is	a difference
     in	the interpretation of event counter 14 (``Virtual coherency
     condition'' for parts before revision 3.1 or ``ALU/FPU completion
     cycles'' for parts	at revision 3.1	or later).  There are also some	subtle
     differences in the	semantics of some of the event counters.  In systems
     with a homogeneous	deployment of R10000 CPUs at the same revision,
     ecadmin will adjust the description of event counter 14 accordingly.

     For systems with a	mixed deployment of R10000 CPU revisions including
     some before 3.1 and some at or after 3.1, the interpretation of event
     counter 14	is undefined, and there	may be some slight inaccuracies	due to
     aggregation of counters with different semantics across all CPUs.	For
     this reason counter 14 may	not be enabled on systems with mixed R10000
     reployments unless	the -T flag is specified.

     Identification of the types and revisions for all CPUs can	be made	using
     the -v flag to hinv(1), or	the -D flag to ecadmin.

SEE ALSO    [Toc]    [Back]

      
      
     ecfind(1),	ecstats(1), perfex(1), pminfo(1), speedshop(1) and
     r10k_counters(5).





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ECADMIN(1)							    ECADMIN(1)



     The specifications	for the	MIPS R10000 event counters may be found	at
     http://www.sgi.com/processors/r10k/performance.html


									PPPPaaaaggggeeee 3333
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