Thanks Alexander for the info, we should try to add this to the documentation for performance tuning at https://github.com/neo4j/community/blob/master/kernel/src/docs/ops/jvm.txt
It would be great to add a section on tuning the OS for high IO. Just added one :) Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Tue, May 31, 2011 at 6:49 PM, Alexander Smirnov <alsmirn...@gmail.com>wrote: > I have some clue about this problem. I did face it before, though not > with Neo4j but with other programs that intensive use disks. For > example, my linux box completely frozen by svn update command for huge > projects. The symptoms are same : low CPU load with high iowait ( in > your message, I saw 23% for iowait load ). > MySQL faces the same problem: > http://www.mysqlperformanceblog.com/?s=linux+high+io+wait > There are some recommendations: > 1) Tune io scheduler for disk with database. > 2) disable access time update: noatime,nodiratime flags for disk mount > command or /etc/fstab. > > Not sure what it can help a lot, though. > > On Mon, May 30, 2011 at 11:58 PM, Marco Gerber <mger...@junisphere.net> > wrote: > > Hello everybody > > > > A collection of reference benchmarks would be great, but completely > independent of this, my problem is making my application on linux as > performant as on windows. > > > > Thanks guys, > > Marco > > > > > > -----Original Message----- > > From: user-boun...@lists.neo4j.org on behalf of Rick Bullotta > > Sent: Mon 30.05.2011 18:02 > > To: j...@neotechnology.com; user@lists.neo4j.org > > Subject: Re: [Neo4j] performance issues with ubuntu > > > > Hi, Jim. > > > > Not really thinking of benchmarks, which I agree are tricky to define and > even trickier to standardize. Plus, given the nearly infinitely cool things > you can do with neo, it borders on impossible. > > > > Rather, I'm just thinking of wikifying some of the platform specific best > practices and gotchas/known issues for each. > > > > Rick > > > > ----- Reply message ----- > > From: "Jim Webber" <j...@neotechnology.com> > > Date: Mon, May 30, 2011 11:55 am > > Subject: [Neo4j] performance issues with ubuntu > > To: "Neo4j user discussions" <user@lists.neo4j.org> > > > > Hi Rick, > > > > I concur that we should perhaps have some perf figures, but it's one of > those things that's easier said than done. > > > > For instance, right now we have performance tests running as part of the > Windows/Linux/Mac continuous build and we will fail the build if we drop on > those numbers. Yet creating representative benchmarks (similar to the TPC-X > benchmarks perhaps) is not only difficult, but will almost certainly be of > no use to users or customers when choosing a graph database or in designing > out their own solutions because your access patterns are likely to be so > different from the benchmark patterns. > > > > But if the community could come together and loosely agree upon some > representative benchmarks that would be useful to them > (platform/setup/access pattern) then we could get something into our build > and publishing numbers with a little effort. > > > > Jim > > > > > > _______________________________________________ > > Neo4j mailing list > > User@lists.neo4j.org > > https://lists.neo4j.org/mailman/listinfo/user > > _______________________________________________ > > Neo4j mailing list > > User@lists.neo4j.org > > https://lists.neo4j.org/mailman/listinfo/user > > > > > > _______________________________________________ > > Neo4j mailing list > > User@lists.neo4j.org > > https://lists.neo4j.org/mailman/listinfo/user > > > > > > > > -- > _________________ > entia non sunt multiplicanda praeter necessitatem, > (entities should not be multiplied beyond necessity.) > _______________________________________________ > Neo4j mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user > _______________________________________________ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
