Neo4j 在gremlin上使用关系索引相对较慢

在Neo4j中，我有一个关系索引“index_e_ASSOC_sMETHdGEXP”，包含大约180000条边，所有边都有一个属性“property”。我想做一个简单的查询，列出索引中的200条边，此时不考虑属性值（稍后执行一个查询，如为“边缘”属性所在的200个第一个边缘输出顶点获取相同的属性值您是否尝试多次运行该查询，因此您正在运行一个温暖的图形和索引？

您是否尝试多次运行该查询，因此您正在运行一个温暖的图形和索引？

尽可能运行了23次看，它变化很大。大部分是为了更糟。跑了23次，正如你所看到的，变化很大。大部分是为了更糟。

time = System.currentTimeMillis();
t = new Table(); g.idx('index_e_ASSOC_sMETHdGEXP')[[property: Neo4jTokens.QUERY_HEADER + "*"]][0..200].outV().id.as('nodeId').back(1).alias.as("alias").back(1).chr.as('chr').table(t,["nodeId","alias","chr"]).iterate();
System.currentTimeMillis() - time

time = System.currentTimeMillis();
g.idx('index_e_ASSOC_sMETHdGEXP')[[property: Neo4jTokens.QUERY_HEADER + "*"]][0..200];
System.currentTimeMillis() - time

==> 1124
==> 983
==> 951
==> 864
==> 1175
==> 1189
==> 889
==> 917
==> 822
==> 872
==> 795
==> 736
==> 840
==> 1189
==> 723
==> 756
==> 691
==> 44609
==> 644
==> 640
==> 1110
==> 1007
==> 819

dump_configuration=true
cache_type=gcr
neostore.nodestore.db.mapped_memory=100M
neostore.relationshipstore.db.mapped_memory=4G
neostore.propertystore.db.mapped_memory=200M
neostore.propertystore.db.strings.mapped_memory=1G
neostore.propertystore.db.arrays.mapped_memory=1G
neostore.propertystore.db.index.keys.mapped_memory=1G
neostore.propertystore.db.index.mapped_memory=1G
relationship_cache_array_fraction=8
node_cache_array_fraction=8
node_cache_size=3G
relationship_cache_size=6G

2012-07-06 10:51:49,149 DEBUG [neo4j.diagnostics]: System memory information:
2012-07-06 10:51:49,152 DEBUG [neo4j.diagnostics]: Total Physical memory: 26,37 GB
2012-07-06 10:51:49,152 DEBUG [neo4j.diagnostics]: Free Physical memory: 11,99 GB
2012-07-06 10:51:49,153 DEBUG [neo4j.diagnostics]: Committed virtual memory: 16,43 GB
2012-07-06 10:51:49,153 DEBUG [neo4j.diagnostics]: Total swap space: 27,00 GB
2012-07-06 10:51:49,153 DEBUG [neo4j.diagnostics]: Free swap space: 26,96 GB
2012-07-06 10:51:49,154 DEBUG [neo4j.diagnostics]: JVM memory information:
2012-07-06 10:51:49,154 DEBUG [neo4j.diagnostics]: Free  memory: 1,84 GB
2012-07-06 10:51:49,154 DEBUG [neo4j.diagnostics]: Total memory: 1,87 GB
2012-07-06 10:51:49,154 DEBUG [neo4j.diagnostics]: Max   memory: 13,33 GB
2012-07-06 10:51:49,588 DEBUG [neo4j.diagnostics]: Storage files:
2012-07-06 10:51:49,589 DEBUG [neo4j.diagnostics]: messages.log: 304,72 kB
2012-07-06 10:51:49,589 DEBUG [neo4j.diagnostics]: neostore.propertystore.db.index: 1,02 kB
2012-07-06 10:51:49,589 DEBUG [neo4j.diagnostics]: neostore.propertystore.db: 401,18 MB
2012-07-06 10:51:49,590 DEBUG [neo4j.diagnostics]: neostore.relationshipstore.db.id: 9,00 B
2012-07-06 10:51:49,590 DEBUG [neo4j.diagnostics]: index.db: 1,42 kB
2012-07-06 10:51:49,590 DEBUG [neo4j.diagnostics]: tm_tx_log.1: 0,00 B
2012-07-06 10:51:49,590 DEBUG [neo4j.diagnostics]: neostore.relationshiptypestore.db.names.id: 9,00 B
2012-07-06 10:51:49,591 DEBUG [neo4j.diagnostics]: neostore.propertystore.db.id: 9,00 B
2012-07-06 10:51:49,591 DEBUG [neo4j.diagnostics]: neostore.nodestore.db: 478,88 kB
2012-07-06 10:51:49,591 DEBUG [neo4j.diagnostics]: nioneo_logical.log.active: 4,00 B
2012-07-06 10:51:49,591 DEBUG [neo4j.diagnostics]: neostore.nodestore.db.id: 9,00 B
2012-07-06 10:51:49,591 DEBUG [neo4j.diagnostics]: neostore.propertystore.db.strings.id: 9,00 B
2012-07-06 10:51:49,592 DEBUG [neo4j.diagnostics]: neostore.id: 9,00 B
2012-07-06 10:51:49,592 DEBUG [neo4j.diagnostics]: neostore.propertystore.db.strings: 34,15 MB
2012-07-06 10:51:49,592 DEBUG [neo4j.diagnostics]: neostore.relationshiptypestore.db.id: 9,00 B
2012-07-06 10:53:01,486 INFO  [neo4j]: GC Monitor: Application threads blocked for an additional 14826ms [total block time: 14.826s]
2012-07-06 10:54:24,019 INFO  [neo4j]: GC Monitor: Application threads blocked for an additional 875ms [total block time: 15.701s]
2012-07-06 10:55:25,441 INFO  [neo4j]: GC Monitor: Application threads blocked for an additional 559ms [total block time: 16.26s]
2012-07-06 11:00:16,962 INFO  [neo4j]: GC Monitor: Application threads blocked for an additional 775ms [total block time: 17.035s]

-XX:+DisableExplicitGC
-Xms2000m,
-Xmx15360m

2012-07-06 11:40:31,973 INFO  [neo4j]: GC Monitor: Application threads blocked for an additional 23745ms [total block time: 23.745s]
2012-07-06 11:40:33,961 INFO  [neo4j]: RelationshipCache array size: 17895751 purge count: 0 size is: 0b, 100.0% misses, NaN% collisions (0).
2012-07-06 11:40:33,966 INFO  [neo4j]: NodeCache array size: 17895751 purge count: 0 size is: 0b, 100.0% misses, NaN% collisions (0).