It is not about heap, the page-cache uses off-heap memory. And for the heap related sections you will have to make sure that shutdown is called and also null-out references before calling system.gc()
You can just clean out the instance, e.g. with MATCH (n) DETACH DELETE n; And then repopulate it. Michael > Am 29.03.2016 um 00:06 schrieb Mohammad Hossain Namaki <[email protected]>: > > Yeah. Thanks! my problem is solved by using that setConfig and removing the > registerShutDownHook(); > > Another option I have is deleting all nodes/relationships and then add new > ones to that. However, until some days ago, I didn't even know the problem is > for creating multiple instances (I thought with shutting down them, they will > be removed from heap too). > > My queries created before by some other algorithms, written in a file, and > then in experimental setup, I construct them as a Neo4j instance and use them > one by one. > > you can write your answer under > http://stackoverflow.com/questions/35876057/neo4j-java-api-gc-overhead-limit-exceeded-after-running-multiple-queries > > <http://stackoverflow.com/questions/35876057/neo4j-java-api-gc-overhead-limit-exceeded-after-running-multiple-queries>, > then I can select your answer as the one. > > Thanks. > > On Thursday, March 24, 2016 at 11:25:30 PM UTC-7, Mohammad Hossain Namaki > wrote: > Hi all, > I'm using neo4j.2.3.0. > I'm running some experiments (over ~1000 graph queries) on the Neo4j Java > API. I don't use the cypher for that. So, I have my own algorithm. After > running around 100/200 queries, I'm getting the "GC Overhead Limit Exceeded". > I think there is something wrong with > "org.neo4j.io.pagecache.impl.muninn.MuninnPageCache". > > Is there anyway to bound this cache size in Java API? or disable it? > > I've already used this: > knowledgeGraph = new > GraphDatabaseFactory().newEmbeddedDatabaseBuilder(MODELGRAPH_DB_PATH) > > .setConfig(GraphDatabaseSettings.pagecache_memory, "500M").newGraphDatabase(); > > but it didn't work. > > > > Every time, I open a nested transaction for both query/data graphs and I > success/close them after finishing each query. > > > > I've used -Xmx12g -Xms12g as VM arguments and my machine has 16GB memory. The > data graph itself has 4.00 GB volume on the disk. > > > > Could you please help me on that? > > > > Thanks > > > > > > > > > -- > You received this message because you are subscribed to the Google Groups > "Neo4j" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- You received this message because you are subscribed to the Google Groups "Neo4j" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
