hi,
Sorry for disturb you , I am a chinese engineer , Excused for my bad english
:) .
Recently, I am learning Neo4j and trying to use it in my project . But When
I make a Pressure on neo4j with 5 theads , 10 theads, 20 and 30, I found the
nodes inserted to the Neo4J is not change obvious (sometimes not change ~ ~! ).
Does it not matter with threads ? the kenerl will make it Serial ? Is there any
documents or something about The performance of Neo4j ? thanks for your help
The program as follows:
I put this function in ExecutorService ,with 5/10/30 threads. then test for
the nodes inserted into at same time .(The counts have not changed obviously)
Transaction tx = null;
Node before = null;
try {
for (int i = 0; i < 1000000; i++) {
if(stop == true){
return;
}
if (graphDb == null) {
return;
}
try {
if (tx == null) {
tx = graphDb.beginTx();
}
// 引用计数加1
writeCount.addAndGet(1);
int startNodeString = name.addAndGet(1);
Node start =
getOrCreateNodeWithOutIndex(""
+ startNodeString);
if (before == null) {
// 根节点.哈哈哈 I got U
Node root =
graphDb.getNodeById(0);
root.createRelationshipTo(start, LEAD);
}
if (before != null) {
before.createRelationshipTo(start, LOVES);
}
int endNodeName = name.addAndGet(1);
Node end =
getOrCreateNodeWithOutIndex("" + endNodeName);
start.createRelationshipTo(end, KNOWS);
before = end;
// 每一千次 commit一次
if (i % 100 == 0) {
tx.success();
tx.finish();
tx = null;
}
} catch (Exception e) {
System.out.println("write : = " + e);
}
}
} catch (Exception e) {
} finally {
tx.finish();
}
}
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