hey jim! Thanks for the thoughts. I know I could run it on less RAM, it's not a matter of can or cannot. I am also aware that the more RAM the better the performance. But my question is more: how will it perform with less RAM, say 32GB. Every system is quite fast with this amount of RAM.
I am not sure if we can convince our customer to invest into 3x128GB RAM. (productive system, staging system, test system) Especially since there is not yet any reference application, which would guarantee an acceptable performance with this kind of system. Am 01.11.2011 10:27, schrieb Jim Webber: > Hi Alican, > >> But I am still a bit concerned about the 128GB RAM.. > You can run it on less of course. You could run it on your laptop and it > would still work. > > However Neo4j is clever in its use of RAM. The more RAM you can allocate to > Neo4j, the more chance that database reads can come straight from memory > rather than spending potentially milliseconds going to mechanical disk, > yielding thousands of traversals per second rather than millions. > > So more RAM = less disk hits (statistically) which is where you'll get huge > read performance benefits. Less RAM means more likelihood of going to disk. > > All things being equal, with 128GB RAM you can cache a lot of your dataset in > main memory. Perhaps even all your *active* dataset in fact (since it's about > a quarter the size of your full dataset). That's going to give you blistering > performance. > > Jim > _______________________________________________ > Neo4j mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user -- alican _______________________________________________ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
