[Neo4j] Big Traverser perfomance : are '23 rels per milliseconds' good ?

Mattias Persson mattias at neotechnology.com
Fri Oct 7 09:19:32 CEST 2011


Also, is that the first run directly after a JVM start? The first time you
encounter a Node or Relationship it is loaded from disk into memory so that
the next time it's read from memory instead. The difference between two runs
can be order of magnitudes in difference.

2011/10/6 Michael Hunger <michael.hunger at neotechnology.com>

> Hmm virtual machines might be difficult, esp. with the io indirection.
>
> Your memory settings for the db are:
>        • Fri Oct 07 00:10:01 IST 2011:
> neostore.nodestore.db.mapped_memory=20M
>        • Fri Oct 07 00:10:01 IST 2011:
> neostore.propertystore.db.arrays.mapped_memory=130M
>        • Fri Oct 07 00:10:01 IST 2011:
> neostore.propertystore.db.index.keys.mapped_memory=1M
>        • Fri Oct 07 00:10:01 IST 2011:
> neostore.propertystore.db.index.mapped_memory=1M
>        • Fri Oct 07 00:10:01 IST 2011:
> neostore.propertystore.db.mapped_memory=90M
>        • Fri Oct 07 00:10:01 IST 2011:
> neostore.propertystore.db.strings.mapped_memory=130M
>        • Fri Oct 07 00:10:01 IST 2011:
> neostore.relationshipstore.db.mapped_memory=100M
>
> Can you change that so that it uses the rest of your memory (say 2GB).
>
>        • Fri Oct 07 00:10:01 IST 2011:
> neostore.nodestore.db.mapped_memory=200M
>        • Fri Oct 07 00:10:01 IST 2011:
> neostore.propertystore.db.arrays.mapped_memory=100M
>        • Fri Oct 07 00:10:01 IST 2011:
> neostore.propertystore.db.index.keys.mapped_memory=1M
>        • Fri Oct 07 00:10:01 IST 2011:
> neostore.propertystore.db.index.mapped_memory=1M
>        • Fri Oct 07 00:10:01 IST 2011:
> neostore.propertystore.db.mapped_memory=1000M
>        • Fri Oct 07 00:10:01 IST 2011:
> neostore.propertystore.db.strings.mapped_memory=200M
>        • Fri Oct 07 00:10:01 IST 2011:
> neostore.relationshipstore.db.mapped_memory=800M
>
> See also:
> http://docs.neo4j.org/chunked/snapshot/configuration.html
>
> Could you also have a look at this:
> http://wiki.neo4j.org/content/Linux_Performance_Guide
>
> Is it possible to share your code/graphdb(generator) - also off-list. I'd
> like to have a look.
>
> Thanks
>
> Michael
>
> Am 06.10.2011 um 22:14 schrieb Guillaume ALLEE:
>
> > Hi,
> >
> > Here are the answers I can give you quickly:
> >
> > How much memory does your machine have?
> >> 5066 MB (from free -m)
> >
> > What kind of disk is in there?
> >> I do not know, the machine is a VM  provided by another department of my
> > company. What I can tell you is that on my i5 laptop the same was taking
> 6-8
> > minutes.
> >
> > Have you looked at the memory config for the neo4j db?
> >> No I did only change the head size.
> >
> > What kind of scheduler do you use (please try deadline or as)?
> >> it seems to be as.
> >
> > Can you please share the config and JVM info that is output at the head
> of
> > graphdb/messages.log ?
> >> see here http://pastebin.com/0geHdbNu
> >
> >
> >
> > --
> > View this message in context:
> http://neo4j-community-discussions.438527.n3.nabble.com/Big-Traverser-perfomance-are-23-rels-per-milliseconds-good-tp3400711p3400925.html
> > Sent from the Neo4j Community Discussions mailing list archive at
> Nabble.com.
> > _______________________________________________
> > Neo4j mailing list
> > User at lists.neo4j.org
> > https://lists.neo4j.org/mailman/listinfo/user
>
> _______________________________________________
> Neo4j mailing list
> User at lists.neo4j.org
> https://lists.neo4j.org/mailman/listinfo/user
>



-- 
Mattias Persson, [mattias at neotechnology.com]
Hacker, Neo Technology
www.neotechnology.com


More information about the User mailing list