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From "John H. Embretsen (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1614) Test harness overrides heap size settings when starting Network Server
Date Mon, 31 Jul 2006 13:20:14 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1614?page=comments#action_12424534 ] 
            
John H. Embretsen commented on DERBY-1614:
------------------------------------------

Example impact of this bug:

The 'wisconsin_app.properties' file includes the following:

# flags specific to this test: it runs out of memory on jdk118 sometimes
# so give the JVM more memory always:
jvmflags=-ms32M^-mx128M

Running the lang/wisconsin.java test with default heap size results in the flags from the
wisconsin_app.properties file being overridden by the test harness:

$ java -Dverbose=true -Dframework=DerbyNet org.apache.derbyTesting.functionTests.harness.RunTest
lang/wisconsin.java

Output:

-- listing properties --
derby.debug.true=
derby.storage.checkpointInterval=100000
derby.optimizer.noTimeout=true
derby.language.preloadClasses=true
console.encoding:null file.encoding:ISO8859-1 derby.ui.codeset: null
*** Start: wisconsin jdk1.5.0_06 DerbyNet 2006-07-27 13:35:41 ***
Initialize for framework: DerbyNet
java -ms32M -mx128M -ms16777216 -mx33554432 [SNIP various system properties] org.apache.derby.drda.NetworkServerControl
start
[SNIP rest of output]


The Network Server JVM pics up the last value for each heap setting (-ms and -Xms set the
initial (minimum) heap size. -mx and -Xmx set the maximum heap size). This was (partly) verified
by running the jmap tool (part of Sun's JDK 1.5 or newer) with the "-heap" option against
the server JVM and looking for "MaxHeapSize", which was 32 MB, not 128 MB.

It is likely that during 10.2.0.4 snapshot testing (more precisely: All testing on trunk since
July 8, 2006), tests using non-default heap size flags in DerbyNet or DerbyNetClient frameworks
were run with different server heap sizes than previous testing.


> Test harness overrides heap size settings when starting Network Server
> ----------------------------------------------------------------------
>
>                 Key: DERBY-1614
>                 URL: http://issues.apache.org/jira/browse/DERBY-1614
>             Project: Derby
>          Issue Type: Bug
>          Components: Test
>    Affects Versions: 10.2.0.0
>         Environment: Test frameworks DerbyNet and DerbyNetClient
>            Reporter: John H. Embretsen
>         Assigned To: John H. Embretsen
>             Fix For: 10.2.0.0
>
>
> Test specific heap size settings can be passed to the test harness using the jvmflags
system property, for example in a <testname>_app.properties file or at the command line
when starting a test, e.g "-Djvmflags=-Xms32m^-Xmx32m".
> The test harness almost always overrides such settings when starting a new Network Server
using the org.apache.derbyTesting.functionTests.harness.NetServer class of the test harness.
Currently, if _either_ -ms _or_ -Xms is missing from the jvmflags, NetServer.start() adds
-ms16777216. Also, if _either_ -mx _or_ -Xmx is missing from the jvmflags, NetServer.start()
adds -ms33554432. This has been the case since SVN revision 420048 (July 8, 2006).
> Earlier revisions did not override the heap settings unless the newer -Xms or -Xmx flags
were used instead of the -ms and -mx flags. A patch for DERBY-1091 attempted (among other
things) to make the harness recognize the newer flags as well as the older flags, but the
resulting behavior is (most likely) not as intended. 
> If a test is run in either the DerbyNet framework or the DerbyNetClient framework, the
test-specific JVM flags should (probably) be used for the Network Server JVM as well as the
test JVM. Currently, even if non-default heap size flags are passed to the harness, the server
JVM will ignore these settings since the harness adds -ms and/or -mx flags _after_ all other
heap flags. The exception is if both new and old versions of heap flags are passed to the
harness, e.g:
> jvmflags=-ms32m^-Xms32m^-mx128m^-Xmx128m
> Here is the code causing this behaviour:
> if (setJvmFlags && ((jvmflags.indexOf("-ms") == -1) || (jvmflags.indexOf("-Xms")
== -1)))
>      // only setMs if no starting memory was given
>      jvm.setMs(16*1024*1024); // -ms16m
> if (setJvmFlags && ((jvmflags.indexOf("-mx") == -1) || (jvmflags.indexOf("-Xmx")
== -1)))
>      // only setMx if no max memory was given
>      jvm.setMx(32*1024*1024); // -mx32m

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