Neo4j堆大小

Question

当我在两个不同的linux服务器上使用相同的JVM参数运行我的java嵌入式Neo4j程序时，一个有24个核心和64GRAM成功地完成了工作，但是另一个虽然有768GRAM和32个核心，但是给了我一个堆大小错误。这行代码出错: graphDb = GraphDatabaseFactory().newEmbeddedDatabaseBuilder(PATH+GRAPH_DATABASE_PATH) .setConfig( "keep_logical_logs"，"100M size").newGraphDatabase()；

我在两次运行中都设置了-Xmx4g。该错误是否与第二台服务器上的用户数量和负载有关，因为许多用户共享这台机器？下面是我收到的错误: Exception in thread "main“java.lang.OutOfMemoryError: Java heap space at org.neo4j.io.pagecache.impl.muninn.MuninnPageCache.(MuninnPageCache.java:246) at org.neo4j.kernel.impl.pagecache.ConfiguringPageCacheFactory.createPageCache(ConfiguringPageCacheFactory.java:94) at org.neo4j.kernel.impl.pagecache.ConfiguringPageCacheFactory.getOrCreatePageCache(ConfiguringPageCacheFactory.java:85) at org.neo4j.kernel.impl.factory.PlatformModule.createPageCache(PlatformModule.java:279) at org.neo4j.kernel.impl.factory.PlatformModule.(PlatformModule.java:156) at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.createPlatform(GraphDatabaseFacadeFactory.java:181) at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade(GraphDatabaseFacadeFactory.java:124) at org.neo4j.kernel.impl.factory.CommunityFacadeFactory.newFacade(CommunityFacadeFactory.java:43) at org.neo4j.kernel.impl.factory.GraphDatabaseFacadeFactory.newFacade( org.neo4j.graphdb.factory.GraphDatabaseFactory.newDatabase(GraphDatabaseFactory.java:129) at org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:117) at org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:185) ) (GraphDatabaseFacadeFactory.java:108)

Answer 1

只需显式配置页面缓存大小：

dbms.pagecache.memory=5G

取决于您在磁盘上的存储大小。