Neo4j GC overhead limit exceeded

Question

I was running a test and I got a "GC overhead limit exceeded" error. I understood that it is because I loaded too many primitives in the cache. Am I wrong?

My question then, is how can we prevent ourselves from this? For example, can we evaluate the size of needed memory based on the number of primitives? Is there like a tip to approximatively know about it?

My boss want to know how many primitives can we manage at the same time. I assume it is related to JVM settings but can't manage to find which settings.

Sorry if it is dumb questions, I'm not used to JVM settings and peformance and I have a pretty huge lack of knowledge about it atm. Trying and willing to understand though!

Jimmy.

Answer 1

For me it was helping to add/uncomment the following lines in neo4j-wrapper.conf:

wrapper.java.initmemory=4096
wrapper.java.maxmemory=4096

The problem is the RAM size.

You can find this file in "C:\Program Files\Neo4j Community\neo4j-community-2.1.3\conf" on a Windows system e.g.

PS: another good article on what else could help you (http://jexp.de/blog/2014/06/load-csv-into-neo4j-quickly-and-successfully/).