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Top Forums UNIX for Beginners Questions & Answers Answers to Frequently Asked Questions Tips and Tutorials The Most Incomplete Guide to Performance Tuning Post 302853705 by jlliagre on Sunday 15th of September 2013 09:40:04 PM
Old 09-15-2013
Just a small comment. Beware that depending on the operating system used there are (rare) cases where monitoring commands display slightly different metrics under the same label so might lead to incorrect interpretation.

In particular, what you wrote about the pi/po columns do not apply at least to Solaris vmstat with which the paging activity account disk read and writes due to normal virtual memory I/O like regular mmaped files being accessed.

On Solaris, what AIX reports as pi/po is shown under the api/apo (anonymous pages in/out) columns when the '-p' option is passed to vmstat.
 

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PMTRIMNAMESPACE(3)					     Library Functions Manual						PMTRIMNAMESPACE(3)

NAME
pmTrimNameSpace - prune a performance metrics name space C SYNOPSIS
#include <pcp/pmapi.h> int pmTrimNameSpace(void); cc ... -lpcp DESCRIPTION
If the current Performance Metrics Application Programming Interface (PMAPI) context corresponds to a version 1 archive log of Performance Co-Pilot (PCP) performance metrics (as collected by pmlogger(1) -V1), then the currently loaded Performance Metrics Name Space (PMNS), is trimmed to exclude metrics for which no description can be found in the archive. The PMNS is further trimmed to remove empty subtrees that do not contain any performance metric. Since PCP archives usually contain some subset of all metrics named in the default PMNS, pmTrimNameSpace effectively trims the applica- tion's PMNS to contain only the names of the metrics in the archive. Since PCP 2.0, pmTrimNameSpace is only needed for dealing with version 1 archives. Version 2 archives actually store the "trimmed" PMNS. Prior to any trimming, the PMNS is restored to the state as of the completion of the last pmLoadASCIINameSpace(3) or pmLoadNameSpace(3), so the effects of consecutive calls to pmTrimNameSpace with archive contexts are not additive. If the current PMAPI context corresponds to a host and a pmLoadASCIINameSpace(3) or pmLoadNameSpace(3) call was made, then the PMNS reverts to all names loaded into the PMNS at the completion of the last pmLoadASCIINameSpace(3) or pmLoadNameSpace(3), i.e. any trimming is undone. On success, pmTrimNameSpace returns zero. SEE ALSO
pmlogger(1), PMAPI(3), pmLoadASCIINameSpace(3), pmLoadNameSpace(3), pmNewContext(3) and pmns(5). DIAGNOSTICS
PM_ERR_NOPMNS you must have loaded a PMNS using pmLoadASCIINameSpace(3) or pmLoadNameSpace(3) before calling pmTrimNameSpace PM_ERR_NOCONTEXT the current PMAPI context is invalid Performance Co-Pilot PCP PMTRIMNAMESPACE(3)
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