HBASE-11855 HBase handbook chapter 18.9 out of date (Michael Tauscher)
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@ -1044,17 +1044,22 @@ public class TestHRegionInfo {
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<title>Running tests faster</title>
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<para> By default, <code>$ mvn test -P runAllTests</code> runs 5 tests in parallel.
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It can be increased on a developer's machine. Allowing that you can have 2 tests
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in parallel per core, and you need about 2Gb of memory per test (at the
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extreme), if you have an 8 core, 24Gb box, you can have 16 tests in parallel.
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in parallel per core, and you need about 2GB of memory per test (at the
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extreme), if you have an 8 core, 24GB box, you can have 16 tests in parallel.
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but the memory available limits it to 12 (24/2), To run all tests with 12 tests
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in parallel, do this: <command>mvn test -P runAllTests
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-Dsurefire.secondPartThreadCount=12</command>. To increase the speed, you
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can as well use a ramdisk. You will need 2Gb of memory to run all tests. You
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will also need to delete the files between two test run. The typical way to
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configure a ramdisk on Linux is:</para>
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-Dsurefire.secondPartForkCount=12</command>. If using a version earlier than
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2.0, do: <command>mvn test -P runAllTests -Dsurefire.secondPartThreadCount=12
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</command>. To increase the speed, you can as well use a ramdisk. You will need 2GB
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of memory to run all tests. You will also need to delete the files between two
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test run. The typical way to configure a ramdisk on Linux is:</para>
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<screen language="bourne">$ sudo mkdir /ram2G
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sudo mount -t tmpfs -o size=2048M tmpfs /ram2G</screen>
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<para>You can then use it to run all HBase tests with the command: </para>
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<para>You can then use it to run all HBase tests on 2.0 with the command: </para>
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<screen language="bourne">mvn test
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-P runAllTests -Dsurefire.secondPartForkCount=12
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-Dtest.build.data.basedirectory=/ram2G</screen>
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<para>On earlier versions, use: </para>
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<screen language="bourne">mvn test
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-P runAllTests -Dsurefire.secondPartThreadCount=12
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-Dtest.build.data.basedirectory=/ram2G</screen>
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