Any help ?
On Friday, July 4, 2014 2:36:59 PM UTC+5:45, ashish jindal wrote:
>
> Hi,
> I am relatively new to neo4j. I have implemented a traversal algorithm
> using neo4j as underlying graph storage.
> Graph has about 40K nodes and about 2M edges.
> Using 2.1.2 community version of neo4j embedded. It is hosted as service
> in tomcat7 with allocated 6Gb of memory on 14.04 Ubuntu.
> Following is a piece of code which does numeric index queries.
>
> *RelationshipIndex numericIndex
> = graphDb.index().forRelationships(Constants.RELATIONSHIP_INDEX);*
> * public Relationship getRelationship(Node n, int lowerlimit, int
> upperlimit) throws Exception {*
>
>
> * long t1 = System.currentTimeMillis();*
> * IndexHits<Relationship> hits =
> numericIndex.query(QueryContext.numericRange("start_time", lowerlimit,
> upperlimit, true, true), n, null);*
> * long t2 = System.currentTimeMillis();*
> * time_spent_in_numeric_index_queries += t2-t1; // global
> variable*
> * // do something on hits and return a
> relationship from it*
>
> * }*
> for a single threaded traversal time_spent_in_numeric_index_queries ~= 1
> sec.
> but if i do multiple traversals ( same traversal ) in parallel ,
> time_spent_in_numeric_index_queries increases linearly . for 10 calls in
> parallel it takes ~= 5 sec.
> Also, i am only doing read operations throughout .
> I want to know, how does querying work? Does it each query lock the entire
> index?
>
>
> Thanks,
> Ashish
>
>
>
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