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Full Discussion: Event processing & machine learning in monitoring system
Special Forums UNIX and Linux Applications Infrastructure Monitoring Event processing & machine learning in monitoring system Post 302821333 by DGPickett on Friday 14th of June 2013 11:44:01 AM
Old 06-14-2013
There is some of this sort of event predition in network protocols, to detect defective or slow paths to avoid, but servers are just supposed to run, not fail, predictable or not. The two flavors of handling this are parallel redundant concurrent load division where a dead server is detected and not sent any more load until it can respond to periodic tests. Recovery from services sent to a dying server is mostly left to client retry, but some systems of transactional middleware do requeue services that do not run to final commit, so they are run on alternative servers. Of course, query services are easier to handle than churn, where you need to rollback all when there is failure, before you requeue. Some systems do not use transactions, but structure churn so it can be applied any number of times and not have duplicate side effects (history filtering or believe the last of that seq. #).
 

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LEARN ABOUT NETBSD

pmc

PMC(1)							    BSD General Commands Manual 						    PMC(1)

NAME

     pmc -- performance-monitoring counter interface for command execution

SYNOPSIS

     pmc -h
     pmc -C
     pmc -c event command [options ...]

DESCRIPTION

     pmc is a means of using a processor's performance-monitoring counter (PMC) facility to measure various aspects of a program's execution.  It
     is meant to be used in a fashion similar to time(1).

     The arguments are as follows:

     -h      Display a list of performance counter events available on the system.

     -C      Cancel any performance counters that are currently running.

     -c event
	     Count the event specified by event while running the command.

DIAGNOSTICS

     PMC support is not compiled into the kernel  Performance-monitoring counter support has not been compiled into the kernel.  It may be
     included using the PERFCTRS option.  See options(4) for details.

     PMC counters are not supported by CPU  Performance-monitoring counters are not available for the CPU.

SEE ALSO

     time(1), options(4)

HISTORY

     The pmc command first appeared in NetBSD 1.6.

AUTHORS

     The pmc command was written by Frank van der Linden <fvdl@wasabisystems.com>.  The kernel support for reading performance counters on the
     i386 architecture was written by
     Jason R. Thorpe <thorpej@zembu.com>.

BUGS

     The pmc command currently only supports performance-monitoring counters on the i386 architecture.

BSD
								 October 24, 2000							       BSD
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