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| metaspace/gc tests - are the test for the Metaspace GC tuning, which is described in the |
| Java SE 8 HotSpot[tm] Virtual Machine Garbage Collection Tuning |
| |
| Tests load classes and monitor the used/committed amounts of metaspace. |
| There are three types of tests all extending base class - MetaspaceBaseGC |
| |
| MemoryUsageTest - |
| trivial test to check memory dynamic (loading classes should lead to growth |
| of used memory, gc to reduce) |
| |
| FirstGCTest - |
| loads classes until the GC has happened and check the GC has happened at the |
| right moment (as stated in the Spec) |
| |
| HighWaterMarkTest |
| The test loads classes until the committed metaspace achieves the certain |
| level between MetaspaceSize and MaxMetaspaceSize. |
| Then it counts how many times GC has been induced. |
| Test verifies that MinMetaspaceFreeRatio/MaxMetaspaceFreeRatio settings |
| affect the frequency of GC. (High-water mark) |
| |
| Note: GC could be caused not by Metaspace. When GC happens, the tests check |
| gc.log file to find the reason of GC. Tests will pass if there is no guarantee |
| that GC was induced by metaspace. |
