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Full Discussion: Context-switching - vmstat
Homework and Emergencies Homework & Coursework Questions Context-switching - vmstat Post 302459964 by snowboarder on Tuesday 5th of October 2010 05:59:11 PM
Old 10-05-2010
Context-switching - vmstat
1. The problem statement, all variables and given/known data:

Type
`vmstat -s; vmstat -n 1 5; vmstat -n 1 5; vmstat
-s` to your Ruby interpreter. Then terminate your Ruby session. Run the Unix com-
mand vmstat -s; vmstat -n 1 5; vmstat -s in the same terminal window you had
been using for Ruby. Did the context-switching rate of your system change signi cantly,

after the Ruby interpreter was shut down? Explain briey.

2. Relevant commands, code, scripts, algorithms:

3. The attempts at a solution (include all code and scripts):


So what i did is:
After typing this command "vmstat -s; vmstat -n 15; vmstat -n 15; vmstat -s"

I found 2 context switches. The one is 707227535 and the other one is 707222952. I substracted them and divided by 10 as the "vmstat -n 1 5" five times in duration of one second per line. Because it does this 2 times than my calculation looks like that:

context switches per second = (707227535-707222952)/(2x5)=458

After terminating Ruby interpreter i typed: "vmstat -s; vmstat -n 1 5; vmstat -s"

and the calculation goes like that:

context switches per second = (707306157-707303877)/5=456

The questions are:

1. Am i doing the right calculations for context switches?
2. What does it mean that the resolt in both cases is so close to each other?

Thank you with advance.


4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):

University of Auckland
Auckland City
New Zealand
Clark Thomborson
 

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LEARN ABOUT DEBIAN

actdiag

ACTDIAG(1)						      General Commands Manual							ACTDIAG(1)

NAME

       actdiag - generate activity-diagram image file from spec-text file.

SYNOPSIS

       actdiag [options] files

DESCRIPTION

       This manual page documents briefly the actdiag commands.

       actdiag is a program that generate activity-diagram image file from spec-text file.

OPTIONS

       These  programs	follow	the  usual  GNU  command  line	syntax, with long options starting with two dashes (`-').  A summary of options is
       included below.	For a complete description, see the Info files.

       -h, --help
	      show this help message and exit

       -a, --antialias
	      Pass diagram image to anti-alias filter

       -c FILE, --config=FILE
	      read configurations from FILE

       -o FILE
	      write diagram to FILE

       -f FONT, --font=FONT
	      use FONT to draw diagram

       -s, ----separate
	      Separate diagram images for each group (SVG only)

       -T TYPE
	      Output diagram as TYPE format

SEE ALSO

       The programs are documented fully by
       http://tk0miya.bitbucket.org/actdiag/build/html/index.html

AUTHOR

       actdiag was written by Takeshi Komiya <i.tkomiya@gmail.com>

       This manual page was written by Kouhei Maeda <mkouhei@palmtb.net>, for the Debian project (and may be used by others).

								   June  5, 2011							ACTDIAG(1)
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