perfSONAR User Q&A and Other Discussion

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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:store[\@type=\"LSStore\"]/nmwg:metadata\n";
$hLSXquery .= "    let \$metadata_id := 
\$metadata/\@id
  \n";
$hLSXquery .= "    let \$data :=
/nmwg:store[\@type=\"LSStore\"]/nmwg:data[\@metadataIdRef=\$metadata_id]\n";
$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? 

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



Thanks!
Madhav