sun/java2d/marlin/CrashTest.java has '@ignore tests that take a long time and consumes 5Gb memory'; canonically, @ignore should be followed by the id of the bug which describes the problem and will be used to eventually fix it.

as a note:
the requirement of 5Gb memory should be expressed via '@requires os.maxMemory > 5G'.
if a test execution time is too long for it to be run in regular/automated test execution, the more appropriate way to express this is '/manual' option which excludes a test from automated execution, yet still allows one to run it.