Alican, we have other customers with that RAM sizes.
It is always about the size of your hot data-set (i.e. cached) the better you understand your use-cases, the better you can estimate the # of nodes and rels (and their properties) that have to be cached. Michael Am 01.11.2011 um 10:53 schrieb Alican Gecyasar: > 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 _______________________________________________ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
