Free Knowledge Resources


Linux Manual Pages


Free Software * Books

Source Code

Free Media

Linux

pmstore(3)

NAME

   pmStore - modify values of performance metrics

C SYNOPSIS

   #include <pcp/pmapi.h>

   int pmStore(const pmResult *result);

   cc ... -lpcp

DESCRIPTION

   In some special cases it may be helpful to modify the current values of
   performance metrics, e.g. to reset a counter to zero, or  to  modify  a
   ``metric''  which  is  a  control  variable  for  some agent collecting
   performance metrics.

   The routine pmStore is a lightweight inverse of pmFetch(3).

   The caller must build the pmResult  data  structure  (of  course,  this
   could have been returned from an earlier pmFetch(3) call) and then call
   pmStore.

   It is an error to pass a request to pmStore in which the  numval  field
   within any of the pmValueSet structure has a value less than one.

   The  current  Performance  Metrics  Application  Programming  Interface
   (PMAPI) context must be one with a host as the source of  metrics,  and
   the  current  value  of  the  nominated  metrics  will be changed, i.e.
   pmStore cannot be used to make retrospective changes to information  in
   either the archive logs, or in the recent past for real-time sources of
   metrics.

   The return code from pmStore is zero for success.

SEE ALSO

   PMAPI(3), pmFetch(3) and pmSetMode(3).

DIAGNOSTICS

   PM_ERR_GENERIC
          At least one of the modifications was rejected.  No other status
          is  available from below the PMAPI (this is the lightweight part
          of the functionality!).  In cases where the outcome  of  pmStore
          for  individual metrics is important, the caller should make one
          call to pmStore for each metric.  On  the  other  hand,  a  bulk
          modification  can  be  performed  in  a  single pmStore call for
          situations in which the outcome is not critical.

   PM_ERR_NOTHOST
          The current PMAPI context is an archive rather than a  host,  or
          it  is a host that is not set to the current time, i.e. has been
          ``rewound'' to the recent past using pmSetMode(3).

   PM_ERR_TOOSMALL
          The number of metrics specified in result is less than one.

   PM_ERR_VALUE
          One or more of the pmValueSets in result has a numval field with
          a value less than one.



Opportunity


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.


Free Software


Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.


Free Books


The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Education


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.


birds banner