perfSONAR User Q&A and Other Discussion

[Jason Zurawski <>]

On 9/29/10 8:13 PM, 

 wrote:
> Hi Jason,
>
> Thanks a lot for your response.
>
> I think the only way for me to move forward would be to look at the second
> option you suggested and see how many such mesh measurement instances I can
> find.
>
> Surprisingly none of my look up queries returned the internet2 MA or the Esnet
> MA's that you have mentioned.  I guess I need to have a look at my script!


I just double checked, our pSB should register with this LS:

http://ndb1.internet2.edu:9995/perfSONAR_PS/services/hLS

Someone from ESnet can probably reply with information on theirs.

Thanks;

-jason

> Thanks
> Madhav
>
>
> Hi Madhav;
>
> As Victor noted in his response, you may have more luck finding BWCTL and
> OWAMP daemons instead of MPs. The service author can correct me if I am
> misrepresenting the service - but I do not believe that the BWCTL MPs register
> into the Information Services infrastructure.
>
> Some more comments inline:
>
> On 9/29/10 4:47 PM,
>
> wrote:
> Hi All,
>
> I am a graduate student at Georgia Tech and as part of my research work I have
> been exploring perfsonar deployment and looking to establish the set of
> services I can use.
>
> I am currently interested in performing some on-demand OWAMP measurement
> between a set of nodes in a mesh manner.
>
> I attempted to retrieve the list of access points for OWAMP MP's using the
> following Xquery directed at Home look up services.
>
> my $hLSXquery = "declare namespace
> nmwg=\"http://ggf.org/ns/nmwg/base/2.0/\";\n";;;
> $hLSXquery .= "declare namespace
> perfsonar=\"http://ggf.org/ns/nmwg/tools/org/perfsonar/1.0/\";\n";;;
> $hLSXquery .= "declare namespace
> psservice=\"http://ggf.org/ns/nmwg/tools/org/perfsonar/service/1.0/\";\n";;;
> $hLSXquery .= "declare namespace
> nmtb=\"http://ogf.org/schema/network/base/20070828/\";\n";;;
> $hLSXquery .= "for \$metadata in
> /nmwg: "LSStore\"]/nmwg:metadata\n";
> $hLSXquery .= " let \$metadata_id :=
> \$metadata/
> \n";
> $hLSXquery .= " let \$data :=
> /nmwg: "LSStore\"]/nmwg: ";
> $hLSXquery .= " let \$eventType := \$data/nmwg:metadata/nmwg:eventType";
> $hLSXquery .= " where
> \$metadata/perfsonar:subject/psservice:service/psservice:serviceType=\"MP\"
> and
> \$eventType=\"http://ggf.org/ns/nmwg/tools/owamp/2.0\"";;;
> $hLSXquery .= " return
> \$metadata/perfsonar:subject/psservice:service/psservice:accessPoint";
>
> I queried all the home look up services(i retrieved information about HLS from
> the GLS) one by one using the above query.
>
> Through this script I was able to retrieve all the MA's(changed serviceType to
> MA) that support OWAMP data but when I change the serviceType to MP it
> returned no OWAMP MP's. Same was the case when I queried for BWCTL MP's
>
> I looked at the on-demand support in the document
> www.geant2.net/.../PB_perfSONAR_MDM_3.0_20080125103826.pdf and it only
> mentions about on-demand tests being supported for BWCTL (I was however not
> able to retrieve any data on BWCTL MP's as well)
>
> Has anyone been able to retrieve the list of OWAMP and BWCTL MP's ? I am able
> to retrieve the list of
> pinger MP's via the same script. Would I be correct in inferring that OWAMP
> and BWCTL MP's have not seen much deployment?
>
>
> The pS Performance Toolkit accounts for many of the OWAMP and BWCTL daemons
> you will find in the wild. The Toolkit does not have an MP interface for these
> services though. perfSONAR-BUOY is an MA type service that will expose
> measurements on the Toolkit that are being collected regularly and would be
> your best way to find measurements between arbitrary endpoints.
>
>
> I basically want to be able to monitor the rtt and loss between the set of
> nodes. Is there some other service in perfsonar besides OWAMP which I can use
> to get the same data, considering the lack of OWAMP MP deployment.
>
> If you guys can provide me pointers on how I can accomplish what I am looking
> to do I would be great-full
>
>
>
> I think you can try to get what you are looking for in one of two ways:
>
> 1) use perfSONAR-BUOY to set up your own tests from a central point (perhaps
> at Georgia Tech) to the daemons that you find via the information services.
> This would not be a full mesh, but would be a start.
>
> 2) Rely on perfSONAR-BUOY instances that may have the measurements available
> that you are looking for. For example Internet2 and ESnet perform regular mesh
> testing between points on the backbone networks. If you can find the MAs for
> each deployment (e.g. Internet2's =
> http://ndb1.net.internet2.edu:8085/perfSONAR_PS/services/pSB, ESnet's has
> several, and they can be found in the Information services) you will be able
> to get data for different paths.
>
> Hope this helps;
>
> -jason
>
>
> Thanks!
> Madhav


--

Jason Zurawski, Network Software Engineer III & Research Liaison
Internet2

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