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https://issues.apache.org/jira/browse/DERBY-2344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12474425
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Knut Anders Hatlen commented on DERBY-2344:
-------------------------------------------
One possible approach:
1) Find a minimal max heap value that works for a given revision.
2) Add 20% (or some other value) and run tests with that heap size.
3) Run the nightly tests with this setting until they fail with
OutOfMemoryError.
4) When they fail, analyze what caused the OOME. If it's caused by increased
number of tests, repeat the process from step 1. If it is caused by a leak in
Derby or the tests, fix the leak and repeat the process from step 3.
> 'java.lang.OutOfMemoryError: Java heap space' in NetworkServerThread
> --------------------------------------------------------------------
>
> Key: DERBY-2344
> URL: https://issues.apache.org/jira/browse/DERBY-2344
> Project: Derby
> Issue Type: Bug
> Affects Versions: 10.3.0.0
> Environment: JVM: Sun Microsystems Inc. - 1.5.0_05-b05
> OS: Fedora Core release 5 (Bordeaux) 32bits - Linux 2.6.17-1.2174_FC5 #1 Tue
> Aug 8 15:30:55 EDT 2006
> HW: 1 X Intel(R) Pentium(R) 4 CPU 2.66GHz: 2656.261 MHz, 512 KB cache.
> 773284 kB Total Memory.
> JVM: Sun Microsystems Inc. 1.5.0_06-b04
> OS: Solaris Nevada snv_27a X86 64 bits - SunOS 5.11 snv_27
> HW: 1 X x86 AuthenticAMD family 15 model 36 step 2 (AMD Turion(tm) 64 Mobile
> Technology ML-37): 2000 MHz, unknown cache. 1023 Megabytes Total Memory
> JVM: Sun Microsystems Inc. - 1.5.0_05-b05
> OS: Microsoft Windows XP Professional - 5.1.2600 Service Pack 2 Build 2600 -
> CYGWIN_NT-5.1 1.5.18(0.132/4/2) 2005-07-02 20:30 Cygwin
> HW: 1 X Ferrari 4000 x86 Family 15 Model 36 Stepping 2 AuthenticAMD: ~2000
> MHz, 2,048 MB cache. 1,022 Total Memory.
> Reporter: Ole Solberg
> Attachments: 13.zip, 14.zip, VM_Summary-1.txt,
> VM_Summary-507428JDK14Jvm15-clientjvm.jpg,
> VM_Summary-507428JDK6Jvm6-clientjvm.jpg,
> VM_Summary-J507152DK14Jvm15-clientjvm.jpg,
> VM_Summary-serverJvm-PS_Old_Gen.jpg, VM_Summary-serverJvm.jpg,
> VM_Summary-serverJvm.txt, VM_Summary.jpg
>
>
> I see this only on test machines with 1Gb of memory or less. Our lab-machines
> with 2Gb mem show now problems.
> See
> http://dbtg.thresher.com/derby/test/trunk15/jvm1.5/testing/Limited/testSummary-508068.html
> Extract from a typical thread dump:
> "main" prio=1 tid=0x09e2a760 nid=0xef6 runnable [0xbfd89000..0xbfd8a418]
> at java.net.SocketInputStream.socketRead0(Native Method)
> at java.net.SocketInputStream.read(SocketInputStream.java:129)
> at org.apache.derby.client.net.Reply.fill(Unknown Source)
> at org.apache.derby.client.net.Reply.ensureALayerDataInBuffer(Unknown
> Source)
> at org.apache.derby.client.net.Reply.readDssHeader(Unknown Source)
> at org.apache.derby.client.net.Reply.startSameIdChainParse(Unknown
> Source)
> at
> org.apache.derby.client.net.NetConnectionReply.readExchangeServerAttributes(Unknown
> Source)
> at
> org.apache.derby.client.net.NetConnection.readServerAttributesAndKeyExchange(Unknown
> Source)
> at
> org.apache.derby.client.net.NetConnection.flowServerAttributesAndKeyExchange(Unknown
> Source)
> at
> org.apache.derby.client.net.NetConnection.flowUSRIDPWDconnect(Unknown Source)
> at org.apache.derby.client.net.NetConnection.flowConnect(Unknown Source)
> at org.apache.derby.client.net.NetConnection.<init>(Unknown Source)
> at
> org.apache.derby.client.net.ClientJDBCObjectFactoryImpl.newNetConnection(Unknown
> Source)
> at org.apache.derby.jdbc.ClientDriver.connect(Unknown Source)
> at java.sql.DriverManager.getConnection(DriverManager.java:525)
> - locked <0x8cda8a18> (a java.lang.Class)
> at java.sql.DriverManager.getConnection(DriverManager.java:171)
> - locked <0x8cda8a18> (a java.lang.Class)
> at
> org.apache.derbyTesting.junit.DriverManagerConnector.openConnection(DriverManagerConnector.java:76)
> at
> org.apache.derbyTesting.junit.DriverManagerConnector.openConnection(DriverManagerConnector.java:43)
> at
> org.apache.derbyTesting.junit.TestConfiguration.openDefaultConnection(TestConfiguration.java:764)
> at
> org.apache.derbyTesting.junit.BaseJDBCTestCase.openDefaultConnection(BaseJDBCTestCase.java:205)
> at
> org.apache.derbyTesting.junit.BaseJDBCTestCase.getConnection(BaseJDBCTestCase.java:90)
> at
> org.apache.derbyTesting.functionTests.tests.jdbcapi.BlobClob4BlobTest.setUp(BlobClob4BlobTest.java:56)
> at junit.framework.TestCase.runBare(TestCase.java:128)
> .
> .
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