How to measure waiting time in run queue? Post: 302803019

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Operating Systems AIX How to measure waiting time in run queue? Post 302803019 by GiiGii on Sunday 5th of May 2013 05:45:03 PM

05-05-2013

Registered User

Quote:

Originally Posted by MichaelFelt

This would depend on what you are trying to collect.

One, classic approach, might be to use sar perhaps.

A different approach would be to use AIX Advanced Accounting.

If you are looking for a deep approach, and are looking at a specific process (rather than all processes) of a know PID and/or TID you could use various trace based tools (e.g., tprof, curt, etc) and/or trace and trcrpt. Rather than PID this could also be command name - there are too many options to name them all.

And, another option could be using probevue mechanism.

Hope this helps!

Hello,

Thank you for your answers. I should have specify my working environment :

Business app : SAP R3 on Oracle Cluster-ware
DB : Oracle 11g + RAC
FS : GPFS
OS : AIX 6.1
Servers : IBM psystem (Power7 CPU)

We are investigating divergence between real CPU consumption versus 'sap + rac oracle + gpfs' benchmarks in order to challenge our advanced support from SAP and Oracle.

By the way, I am not a AIX sysadmin neither I am an AIX expert. And unfortunately, I do not have hands over the system. To do something on the system, I have to ask our contractor in charge of. However, I understand thing well ... I think Smilie

About your propositions :

First thing first, I want just graph this waiting time over the time no matter the process. I should read more carefully the SAR doc. I didn't know about the AIX advanced accouting system. Hence, I printed the doc and now I have to read it Smilie

If we find something particuliar, I may go for a deep analysis but not with a real time trace I that is possible. We ran some CURT (3 time 1 minutes) and heavily impacted our 6000 users :x

Thank you again for your time. I will be certainly back with others questions and I hope results.

Regards

GiiGii

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LEARN ABOUT CENTOS

bootchart.conf

BOOTCHART.CONF(5)						  bootchart.conf						 BOOTCHART.CONF(5)

NAME

       bootchart.conf - Boot performance analysis graphing tool configuration file

SYNOPSIS

       /etc/systemd/bootchart.conf

DESCRIPTION

       When starting, systemd-bootchart will read the configuration file bootchart.conf. This configuration file determines logging parameters and
       graph output.

OPTIONS

       Samples=500
	   Configure the amount of samples to record in total before bootchart exits. Each sample will record at intervals defined by Frequency=.

       Frequency=25
	   Configure the sample log frequency. This can be a fractional number, but must be larger than 0.0. Most systems can cope with values
	   under 25-50 without impacting boot time severely.

       Relative=no
	   Configures whether the left axis of the output graph equals time=0.0 (CLOCK_MONOTONIC start). This is useful for using bootchart at
	   post-boot time to profile an already booted system, otherwise the graph would become extremely large. If set to yes, the horizontal
	   axis starts at the first recorded sample instead of time=0.0.

       Filter=no
	   Configures whether the resulting graph should omit tasks that did not contribute significantly to the boot. Processes that are too
	   short-lived (only seen in one sample) or that do not consume any significant CPU time (less than 0.001sec) will not be displayed in the
	   output graph.

       Output=[path]
	   Configures the output directory for writing the graphs. By default, bootchart writes the graphs to /run/log.

       Init=[path]
	   Configures bootchart to run a non-standard binary instead of /sbin/init. This option is only relevant if bootchart was invoked from the
	   kernel command line with init=/usr/lib/systemd/systemd-bootchart.

       PlotMemoryUsage=no
	   If set to yes, enables logging and graphing of processes' PSS memory consumption.

       PlotEntropyGraph=no
	   If set to yes, enables logging and graphing of the kernel random entropy pool size.

       ScaleX=100
	   Horizontal scaling factor for all variable graph components.

       ScaleY=20
	   Vertical scaling factor for all variable graph components.

SEE ALSO

       systemd-bootchart(1), systemd.directives(7)

systemd 208															 BOOTCHART.CONF(5)