Fuseki server unresponsive when running multiple construct queries using multi-threading.

Hi Andy,

We are running concurrency tests for Fuseki 0.2.1 (downloaded from http://www.apache.org/dist/incubator/jena/jena-fuseki-0.2.1-incubating/).
We're running multiple construct queries (approximately 200 queries) using Task Parallel Library of .Net to talk to Fuseki and get response back. We've first tried through dotNetRdf and when about 25 queries have run, the fuseki server freezes and becomes unresponsive. To make it responsive again, we had to restart the fuseki service.
Now the construct query is a bit that stands out here because its querying two separate service endpoints. Following is the sample construct query that we're using:
CONSTRUCT
{
<http://rahul.org/company/id/123456> ?predicate ?object .
?blankNode ?blankNodePredicate ?blankNodeObject .
<http://rahul.org/company/id/123456> ?pred ?blankNode1 .
?blankNode1 ?blankNodePredicate1 ?blankNodeObject1 .
}
WHERE
{
SERVICE <http://localhost:3030/companies/sparql>

{ <http://rahul.org/company/id/123456> ?predicate ?object . }

SERVICE <http://localhost:3030/rahul/sparql>
{
OPTIONAL

{ <http://rahul.org/company/id/123456> ?pred ?blankNode1 . ?blankNode1 ?blankNodePredicate1 ?blankNodeObject1 . }

}
}

Then we ran the queries again to make sure its not because of dotNetRdf - so we've used a simple HttpWebRequest - something like this:
var request = HttpWebRequest.Create("http://localhost:3030/query/sparql?query=" + GetUtf8(sparql)) as HttpWebRequest;
request.Method = "GET";
var response = request.GetResponse();

Could you please help with this problem of Fuseki server becoming unresponsive in the above mentioned case.

Thanks,
Rahul