> I would recommend using the default value for this property - 1. But, if you > want to run a few of long queries, it could be increased.
Doesn’t help I have already tried to execute test with configurations: 1 request queryParalellism = 1 100 concurrent request queryParalellism = 1 1 request queryParalellism = 48 100 concurrent request queryParalellism = 48 For last three tests performance or CPU usage maximum change on 5% In parallel discusion here http://apache-ignite-users.70518.x6.nabble.com/Ignite-poor-performance-td18670.html <http://apache-ignite-users.70518.x6.nabble.com/Ignite-poor-performance-td18670.html> one of users suggest to use parallelism With best regards Alisher Alimov [email protected] > On 4 Dec 2017, at 17:41, Evgenii Zhuravlev <[email protected]> wrote: > > Hi, > > Please share benchmarks code, it's hard to understand why you can't load CPU > for 100% without your code. > > But I see one thing, that definitely could lead to performance problems - > you've set <property name="queryParallelism" value=“48"/> - this could lead > to a lot of context switching since every query could be executed in 48 > threads. I'm sure that you run a lot of queries in parallel, so, it's a very > big value for this property, even if you have 48 CPU on a machine. > > I would recommend using the default value for this property - 1. But, if you > want to run a few of long queries, it could be increased. > > Also, this property doesn't work for SQL queries, and, actually, for a > default off-heap cache since version 2.0 at all: > > <property name="copyOnRead" value="true"/> > > Evgenii > > 2017-12-04 16:36 GMT+03:00 Ali <[email protected] > <mailto:[email protected]>>: > Hi! > > I found poor sql index performance and CPU utilisation in ignite 2.3 version > when try to benchmark cluster for performance. > > Cluster configuration: > > 6 x 2 E5-2600v2 256GB 10GB link > 1 x 4 E7 node (edge) from which tests are running > > Ignite config > > > <property name="cacheConfiguration"> > <bean class="org.apache.ignite.configuration.CacheConfiguration"> > <property name="name" value=“test"/> > <property name="backups" value="0"/> > <property name="atomicityMode" value="ATOMIC"/> > <property name="cacheMode" value="PARTITIONED"/> > <property name="copyOnRead" value="true"/> > <property name="readFromBackup" value="true"/> > <property name="queryParallelism" value=“48"/> > <property name="rebalanceMode" value="ASYNC"/> > <property name="statisticsEnabled" value="false"/> > > <property name="queryEntities"> > <list> > <bean class="org.apache.ignite.cache.QueryEntity"> > > <constructor-arg value="java.lang.String"/> > <constructor-arg value=“com.example.Test"/> > > <property name="tableName" value=“Test"/> > <property name="fields"> > <map> > <entry key=“field-1" value="java.lang.String"/> > <entry key=“field-2" value="java.lang.String"/> > <entry key=“field-3" value="java.lang.String"/> > <entry key=“field-4" value="java.lang.String"/> > <entry key=“field-5" value="java.lang.String"/> > <entry key=“field-6" value="java.lang.Long"/> > </map> > </property> > > <property name="indexes"> > <list> > <bean class="org.apache.ignite.cache.QueryIndex"> > <property name="name" value="fields_idx"/> > <property name="fields"> > <map> > <entry key=“field-2" value="true"/> > <entry key=“field-3" value="true"/> > <entry key=“field-4" value="true"/> > <entry key=“field-5" value="true"/> > <entry key=“field-6" value="true"/> > </map> > </property> > <property name="inlineSize" value="24"/> > <property name="indexType" value="SORTED"/> > </bean> > </list> > </property> > </bean> > </list> > </property> > </bean> > </property> > > Query > > public Collection<Test> find(String mcc, String mnc, String lac, String cid, > long lastSeenDt, long offset, long limit) { > SqlQuery<String, Test> qry = new SqlQuery<>( > Entry.class, > "select * from Test where field-2 = ? and field-3 = ? and field-4 > = ? and field-5 = ? and field-6 >= ? limit ? offset ?" > ); > > qry.setArgs(mcc, mnc, lac, cid, lastSeenDt, limit, offset); > > try (QueryCursor<Cache.Entry<String, Test>> query = cache.query(qry)) { > return StreamSupport.stream(query.spliterator(), false) > .map(Cache.Entry::getValue) > .collect(Collectors.toList()); > } > } > > Benchmark > > > Benchmark consist of several java processes that call this query through RMI > in {1..20 000} threads but maximum CPU utilisation doesn’t increase more than > 9% on each node and doesn’t depend on load > > simple IgniteCache#get test fully utilise CPU > > > > With best regards > Alisher Alimov > [email protected] <mailto:[email protected]> >
