@graphway 我是对所有的节点和关系作为分类统计，在neo4j管理界面多刷几次，直接垃圾收集器停止，导致整个应用崩溃，然而我在SDN中做测试。开十五个线程，周期性循环五十次，直接导致CPU飙升，无法返回Cypher执行的结果。

@pangguoming 难道一定要64G这样的大内存才能扛住？

# Java Heap Size: by default the Java heap size is dynamically
# calculated based on available system resources.
# Uncomment these lines to set specific initial and maximum
# heap size.
dbms.memory.heap.initial_size=6G
dbms.memory.heap.max_size=6G

# The amount of memory to use for mapping the store files, in bytes (or
# kilobytes with the 'k' suffix, megabytes with 'm' and gigabytes with 'g').
# If Neo4j is running on a dedicated server, then it is generally recommended
# to leave about 2-4 gigabytes for the operating system, give the JVM enough
# heap to hold all your transaction state and query context, and then leave the
# rest for the page cache.
# The default page cache memory assumes the machine is dedicated to running
# Neo4j, and is heuristically set to 50% of RAM minus the max Java heap size.
dbms.memory.pagecache.size=6g