[GitHub] [accumulo] milleruntime opened a new issue #1099: Examine Hot Methods

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milleruntime opened a new issue #1099: Examine Hot Methods
URL: https://github.com/apache/accumulo/issues/1099
 
 
   I did some analysis of how well the JIT compiler optimizes Accumulo code by running tests locally in JMH and against a single local instance of Uno. To print what the JIT compiler was doing, I used the following java options:
   
   -XX:+PrintCompilation 
   -XX:+UnlockDiagnosticVMOptions 
   -XX:+PrintInlining
   
   Then I would grep the output for "accumulo" and "hot method too big". Here is the list of methods I compiled from the tests I did on both client and server.:
   
   org.apache.accumulo.core.client.impl.TabletLocatorImpl::processInvalidated
   org.apache.accumulo.core.client.impl.ThriftScanner::scan
   org.apache.accumulo.core.data.Key::equals
   org.apache.accumulo.core.data.thrift.TMutation$TMutationStandardScheme::read 
   org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader::_seek
   org.apache.accumulo.core.file.rfile.RelativeKey::<init>
   org.apache.accumulo.core.file.rfile.RelativeKey::readFields
   org.apache.accumulo.core.security.ColumnVisibility$ColumnVisibilityParser::parse_
   org.apache.accumulo.fate.zookeeper.ZooCache$2::run
   org.apache.accumulo.server.constraints.MetadataConstraints::check
   org.apache.accumulo.server.master.LiveTServerSet::checkServer
   org.apache.accumulo.tserver.FileManager::reserveReaders
   org.apache.accumulo.tserver.constraints.ConstraintChecker::check
   org.apache.accumulo.tserver.scan.NextBatchTask::run 
   org.apache.accumulo.tserver.tablet.ScanDataSource::createIterator 
   org.apache.accumulo.tserver.tablet.Scanner::read
   
   Taken from https://issues.apache.org/jira/browse/ACCUMULO-4621
   
   I originally did this for 2.0 on Java 8.  It would be good to examine these methods on Java 11 to see if they are affecting performance.

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