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  2. Getting Edges - Performance

Re: Getting Edges - Performance

Joe Obernberger
 

Looking for documentation on how to do profile() - do you have any?


Queries like this are also slow:

Edge dataSourceToCorrelationEdge = traversal.E().has("edgeID", edgeID).next();


There is an index on edgeID (mgmt.buildIndex("byEdgeIDComposite", Edge.class).addKey(edgeID).unique().buildCompositeIndex();)
I'm trying to cache the actual JanusGraph edgeID string in an outside cache to help with this, but when it's not in the cache, it can take 2 seconds to return.


-Joe


On 6/22/2022 4:53 PM, Boxuan Li wrote:

It's very suspicious. It shouldn't take 3 seconds just to load 3 edges. Can you provide the profile()​ output here when you see such slowness? It is also worth trying if other queries (e.g. loading a vertex) experience similar slowness.
From: janusgraph-users@... <janusgraph-users@...> on behalf of Joe Obernberger via lists.lfaidata.foundation <joseph.obernberger=gmail.com@...>
Sent: Wednesday, June 22, 2022 4:51 PM
To: janusgraph-users@... <janusgraph-users@...>
Subject: Re: [janusgraph-users] Getting Edges - Performance
 

It's usually small; typically around 3 edges.
Reading your article (https://li-boxuan.medium.com/janusgraph-deep-dive-part-3-speed-up-edge-queries-3b9eb5ba34f8).

Outbound edges could be large - 100s to 10000s.


-Joe


On 6/22/2022 4:49 PM, Boxuan Li wrote:
When it takes over 3 seconds to return, how many edges does it return?
From: janusgraph-users@... <janusgraph-users@...> on behalf of Joe Obernberger via lists.lfaidata.foundation <joseph.obernberger=gmail.com@...>
Sent: Wednesday, June 22, 2022 1:06 PM
To: janusgraph-users@... <janusgraph-users@...>
Subject: [janusgraph-users] Getting Edges - Performance
 
Hi All - I'm seeing a performance issue with this statement in Java code:

Iterator<Edge> edgeIt = vert.edges(Direction.IN);

in some cases this is taking over 3 seconds to return.  What can I do to
better this performance?
Thank you!

-Joe


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