SIMPLE SOLUTIONS

PMPARSETIMEWINDOW(3) - man page online | library functions

Parse time window command line arguments.

Chapter
PCP
PMPARSETIMEWINDOW(3)                 Library Functions Manual                PMPARSETIMEWINDOW(3)

NAME

pmParseTimeWindow - parse time window command line arguments

C SYNOPSIS

#include <pcp/pmapi.h> int pmParseTimeWindow(const char *swStart, const char *swEnd, const char *swAlign, const char *swOffset, const struct timeval *logStart, const struct timeval *logEnd, struct timeval *rsltStart, struct timeval *rsltEnd, struct timeval *rsltOffset, char **errMsg); cc ... -lpcp

DESCRIPTION

pmParseTimeWindow is designed to encapsulate the interpretation of the -S, -T, -A and -O command line options used by Performance Co-Pilot (PCP) applications to define a time win‐ dow of interest. The time window is defined by a start time and an end time that con‐ strains the time interval during which the PCP application will retrieve and display per‐ formance metrics. In the absence of the -O and -A options to specify an initial sample time origin and time alignment (see below), the PCP application will retrieve the first sample at the start of the time window. The syntax and meaning of the various argument formats for these options is described in PCPIntro(1).

USAGE

pmParseTimeWindow expects to be called with the argument of the -S option as swStart, the argument of the -T option as swEnd, the argument of the -A option as swAlign, and the ar‐ gument of the -O option as swOffset. Any or all of these parameters may be NULL to indi‐ cate that the corresponding command line option was not present. If the application is using a PCP archive log as the source of performance metrics, you also need to supply the time of the first archive log entry as logStart, and the time of the last archive log entry as logEnd. See pmGetArchiveLabel(3) and pmGetArchiveEnd(3) for how to obtain values for these times. If the application is manipulating multiple concurrent archive logs, then the caller must resolve how the default time window is to be defined (the union of the time intervals in all archive logs is a likely interpretation). If the application is using a live feed of performance data, logStart should be the cur‐ rent time (but could be aligned on the next second for example), while logEnd should have its tv_sec component set to INT_MAX. The rsltStart, rsltEnd and rsltOffset structures must be allocated before calling pmParse‐ TimeWindow. You also need to set the current PCP reporting time zone to correctly reflect the -z and -Z command line parameters before calling pmParseTimeWindow. See pmUseZone(3) and friends for information on how this is done.

SEE ALSO

PMAPI(3), pmGetArchiveEnd(3), pmGetArchiveLabel(3), pmNewContextZone(3), pmNewZone(3), pm‐ ParseInterval(3) and pmUseZone(3).

DIAGNOSTICS

If the conversion is successful, pmParseTimeWindow returns 1 and fills in rsltStart, rsl‐ tEnd and rsltOffset with the start, end, and offset times for the time window defined by the input parameters. The errMsg parameter is not changed when pmParseTimeWindow returns 1. If the conversion is successful, but the requested alignment could not be performed (e.g. the PCP archive log is too short) the alignment is ignored, rsltStart, rsltEnd and rsltOffset are filled in and pmParseTimeWindow returns 0. In this case, errMsg will point to a warning message in an internal static buffer. This buffer should not be freed. If the argument strings could not be parsed, pmParseTimeWindow returns -1. In this case, errMsg will point to an error message in a static internal buffer.
Performance Co-Pilot PCP PMPARSETIMEWINDOW(3)
This manual Reference Other manuals
pmParseTimeWindow(3) referred by __pmConvertTime(3) | pmParseInterval(3) | __pmParseTime(3)
refer to PCPIntro(1) | PMAPI(3) | pmGetArchiveEnd(3) | pmGetArchiveLabel(3) | pmNewContextZone(3) | pmNewZone(3) | pmUseZone(3)