1. 03 8月, 2017 2 次提交
  2. 20 2月, 2014 1 次提交
    • D
      Introduce new OOM testing support · 590029f6
      Daniel P. Berrange 提交于
      The previous OOM testing support would re-run the entire "main"
      method each iteration, failing a different malloc each time.
      When a test suite has 'n' allocations, the number of repeats
      requires is  (n * (n + 1) ) / 2.  This gets very large, very
      quickly.
      
      This new OOM testing support instead integrates at the
      virtTestRun level, so each individual test case gets repeated,
      instead of the entire test suite. This means the values of
      'n' are orders of magnitude smaller.
      
      The simple usage is
      
         $ VIR_TEST_OOM=1 ./qemuxml2argvtest
         ...
         29) QEMU XML-2-ARGV clock-utc                                         ... OK
             Test OOM for nalloc=36 .................................... OK
         30) QEMU XML-2-ARGV clock-localtime                                   ... OK
             Test OOM for nalloc=36 .................................... OK
         31) QEMU XML-2-ARGV clock-france                                      ... OK
             Test OOM for nalloc=38 ...................................... OK
         ...
      
      the second lines reports how many mallocs have to be failed, and thus
      how many repeats of the test will be run.
      
      If it crashes, then running under valgrind will often show the problem
      
        $ VIR_TEST_OOM=1 ../run valgrind ./qemuxml2argvtest
      
      When debugging problems it is also helpful to select an individual
      test case
      
        $ VIR_TEST_RANGE=30 VIR_TEST_OOM=1 ../run valgrind ./qemuxml2argvtest
      
      When things get really tricky, it is possible to request that just
      specific allocs are failed. eg to fail allocs 5 -> 12, use
      
        $ VIR_TEST_RANGE=30 VIR_TEST_OOM=1:5-12 ../run valgrind ./qemuxml2argvtest
      
      In the worse case, you might want to know the stack trace of the
      alloc which was failed then VIR_TEST_OOM_TRACE can be set. If it
      is set to 1 then it will only print if it thinks a mistake happened.
      This is often not reliable, so setting it to 2 will make it print
      the stack trace for every alloc that is failed.
      
        $ VIR_TEST_OOM_TRACE=2 VIR_TEST_RANGE=30 VIR_TEST_OOM=1:5-5 ../run valgrind ./qemuxml2argvtest
        30) QEMU XML-2-ARGV clock-localtime                                   ... OK
            Test OOM for nalloc=36 !virAllocN
        /home/berrange/src/virt/libvirt/src/util/viralloc.c:180
        virHashCreateFull
        /home/berrange/src/virt/libvirt/src/util/virhash.c:144
        virDomainDefParseXML
        /home/berrange/src/virt/libvirt/src/conf/domain_conf.c:11745
        virDomainDefParseNode
        /home/berrange/src/virt/libvirt/src/conf/domain_conf.c:12646
        virDomainDefParse
        /home/berrange/src/virt/libvirt/src/conf/domain_conf.c:12590
        testCompareXMLToArgvFiles
        /home/berrange/src/virt/libvirt/tests/qemuxml2argvtest.c:106
        virtTestRun
        /home/berrange/src/virt/libvirt/tests/testutils.c:250
        mymain
        /home/berrange/src/virt/libvirt/tests/qemuxml2argvtest.c:418 (discriminator 2)
        virtTestMain
        /home/berrange/src/virt/libvirt/tests/testutils.c:750
        ??
        ??:0
        _start
        ??:?
         FAILED
      Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
      590029f6