Re: Evaluating SystemTap for Network Response Times

[Nathan DeBardeleben <ndebard at lanl dot gov>]

I appreciate all the help getting my feet off the ground.  What you sent 
me works perfectly, however, I want to understand it a bit more (of course).
I guess I have some basic questions about ST.  For instance, I tried 
running the 'top2.stp' David Sperry included in the list and that gives 
me errors about resolving kernel.syscall.*.  I'm guessing it has 
something to do with a syscall tapset, but where do I go about getting 
those?  And further more, how do I know I need them?

What really is a 'tapset'?  Is it just a collection of useful functions 
that users might want to call that you put into a nice location so as to 
keep from copying the code raw into each script that needs it?  Or is it 
something more?

And when I look at David's output it doesn't look like he pointed at an 
include directory.  Just really confused.

I know, lots of questions and I'm sure questions that would be in a nice 
document if this weren't a project under such heavy development.

Thanks all.  I apologize for the newbie questions, I'll get there soon. :)

-- Nathan
Correspondence
---------------------------------------------------------------------
Nathan DeBardeleben, Ph.D.
Los Alamos National Laboratory
Parallel Tools Team
High Performance Computing Environments
phone: 505-667-3428
email: ndebard@lanl.gov
---------------------------------------------------------------------



Hien Nguyen wrote:
> Hi Nathan,
>
> There are actually two seperate files
> 1. tcp_mon.stp
> 2. tcp_tapset/tapset.stp
>
> I include in this mail a tar file for those file for your convenience.
> Create a tmp directory,
> cd tmp, untar the file and run
> stap -I./tcp_tapset tcp_mon.stp (as root)
>
> Thanks, Hien.
>
> Nathan DeBardeleben wrote:
>
> > Hien Nguyen wrote:
> >
> > > Hi Nathan,
> > >
> > > I think what you are trying to achieve could be done with systemtap. 
> > > I wrote a small script to monitor the tcp traffic a while back (see 
> > > URL below)
> > > http://sourceware.org/ml/systemtap/2005-q4/msg00302.html
> > I'm a complete newbie to systemtap, so please explain why when I try 
> > and run the example on the link above that you sent me I get this:
> >
> > > [root@kraken1 systemtap]# stap -v tcp_mon.stp
> > > Created temporary directory "/tmp/stapM6VSNS"
> > > parse error: embedded code in unprivileged script
> > >         saw: embedded-code at tcp_mon.stp:70:1
> > > 1 parse error(s).
> > > Searched 
> > > '/usr/share/systemtap/tapset/2.6.14-1.1656_FC4smp/x86_64/*.stp', 
> > > match count 0
> > > Searched '/usr/share/systemtap/tapset/2.6.14-1.1656_FC4smp/*.stp', 
> > > match count 0
> > > Searched '/usr/share/systemtap/tapset/2.6.14/x86_64/*.stp', match 
> > > count 0
> > > Searched '/usr/share/systemtap/tapset/2.6.14/*.stp', match count 1
> > > Searched '/usr/share/systemtap/tapset/2.6/x86_64/*.stp', match count 0
> > > Searched '/usr/share/systemtap/tapset/2.6/*.stp', match count 0
> > > Searched '/usr/share/systemtap/tapset/x86_64/*.stp', match count 0
> > > Searched '/usr/share/systemtap/tapset/*.stp', match count 8
> > > Pass 1: parsed user script and 9 library script(s).
> > > Pass 1: parse failed.  Running rm -rf /tmp/stapM6VSNS
> > > [root@kraken1 systemtap]# 
> >
> > Also you say to copy tapset.stp to a directory you create in that 
> > post - where do I get tapset.stp?
> >
> > Sorry for the beginner question :)
> >
> > -- Nathan
> > Correspondence
> > ---------------------------------------------------------------------
> > Nathan DeBardeleben, Ph.D.
> > Los Alamos National Laboratory
> > Parallel Tools Team
> > High Performance Computing Environments
> > phone: 505-667-3428
> > email: ndebard@lanl.gov
> > ---------------------------------------------------------------------