使用具有超过120GB RAM的Concurrent Mark Sweep垃圾收集器

Question

Has anyone managed to use the Concurrent Mark Sweep garbage collector (UseConcMarkSweepGC) in Hotspot with more than 120GB RAM?

The JVM starts just fine if I set -ms and -mx to 120G, but if I set them to 130G, the JVM crashes on startup. The JVM starts-up fine with the parallel and G1 collectors (but they have their own issues).

Has anyone managed to use the Concurrent Mark Sweep collector with more than a 120GB heap? If so, did you have to do anything special, or am I just being unlucky here?

The stack from the JVM error dump is as follows:

Stack: [0x00007fbd0290d000,0x00007fbd02a0e000],  sp=0x00007fbd02a0c758,  free space=1021k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C  [libc.so.6+0x822c0]  __tls_get_addr@@GLIBC_2.3+0x822c0
V  [libjvm.so+0x389c01]      CompactibleFreeListSpace::CompactibleFreeListSpace(BlockOffsetSharedArray*, MemRegion, bool, FreeBlockDictionary::DictionaryChoice)+0xc1
V  [libjvm.so+0x3d1ae0]  ConcurrentMarkSweepGeneration::ConcurrentMarkSweepGeneration(ReservedSpace, unsigned long, int, CardTableRS*, bool, FreeBlockDictionary::DictionaryChoice)+0x100
V  [libjvm.so+0x49d922]  GenerationSpec::init(ReservedSpace, int, GenRemSet*)+0xf2
V  [libjvm.so+0x48d0b9]  GenCollectedHeap::initialize()+0x2e9
V  [libjvm.so+0x824098]  Universe::initialize_heap()+0xb8
V  [libjvm.so+0x82657d]  universe_init()+0x7d
V  [libjvm.so+0x4cf0dd]  init_globals()+0x5d
V  [libjvm.so+0x80f462]  Threads::create_vm(JavaVMInitArgs*, bool*)+0x1e2
V  [libjvm.so+0x51fac4]  JNI_CreateJavaVM+0x74
C  [libjli.so+0x31b7]  JavaMain+0x97

I've raised a bug for this with Oracle ( http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7175901 ), but I was wondering if anyone else had seen it.

Answer 1

这似乎被Oracle接受为一个错误： http ： //bugs.sun.com/bugdatabase/view_bug.do？video_id = 7175901

Answer 2

Had the same issue. We reduced ms to below 140 and it seems to work. Left mx at 400g and wrote a test program.