Will,
Does your application generate a lot of interned string?
Another way to confirm is with jmap -heap <pid> 'interned Stings' should
be printed. Did full gc happen during the run?
Thanks
Jenny
On 02/21/2017 10:52 AM, Will Bertelsen wrote:
Hi All,
I've been experimenting with G1 in production and have noticed a large
native memory leak that eventually exhausts all memory on the system.
I ran it overnight with NMT enabled and this was the biggest offender:
[0x00007f86c31cf205] Hashtable<oopDesc*,
(MemoryType)9>::new_entry(unsigned int, oopDesc*)+0x165
[0x00007f86c35dd263] StringTable::basic_add(int, Handle, unsigned
short*, int, unsigned int, Thread*)+0xd3
[0x00007f86c35dd452] StringTable::intern(Handle, unsigned short*, int,
Thread*)+0x182
[0x00007f86c35dd921] StringTable::intern(oopDesc*, Thread*)+0x131
(malloc=2628520KB +2601784KB #328565 +325223)
Has anyone seen this before?
Here is my java version and gc settings:
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)
-Xmx16384M
-Xms16384M
-XX:+AggressiveOpts
-XX:+UnlockExperimentalVMOptions
-XX:+UseG1GC
-XX:G1HeapRegionSize=8M
-XX:G1NewSizePercent=20
-XX:G1MaxNewSizePercent=80
-XX:MaxGCPauseMillis=250
-XX:MaxMetaspaceSize=1G
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