Hi
I'm inspecting memory consumption issues of a service running on java-8u102,
linux. The service is running for a few days now, and in a few days more it
would consume all of 32GB physical memory available, and get killed by OOM
Killer.
Questions:
- If the code is not allocating any significant off-heap memory, neither by
Unsafe.allocateMemory or by external library, isn't 7GB native memory overhead
supposed to be enough for a 25GB heap?
- Why so much memory spent on "Internal" category, apparently from G1 thread?
Find the attached jemalloc heap profile, showing "live" allocations that
happened in about 30 hour timespan, and a NMT profile of approximately same
period.
Profiling was done after some warm-up time time, and with a manually triggered
Full GC in between just to give the JVM a chance to clean up everything.
Relevant JVM options:
-Xms25G
-Xmx25G
-Xss256k
-XX:+UseG1GC
-XX:MaxGCPauseMillis=250
-XX:InitiatingHeapOccupancyPercent=80
$ /opt/java/sun-jdk1.8.0-102_no_setcap/bin/jcmd 60028 VM.native_memory
summary.diff scale=MB
60028:
Native Memory Tracking:
Total: reserved=30376MB +599MB, committed=29197MB +601MB
- Java Heap (reserved=25600MB, committed=25600MB)
(mmap: reserved=25600MB, committed=25600MB)
- Class (reserved=1168MB, committed=161MB +1MB)
(classes #24813 -590)
(malloc=4MB #68786 +965)
(mmap: reserved=1164MB, committed=157MB +1MB)
- Thread (reserved=246MB -6MB, committed=246MB -6MB)
(thread #824 -24)
(stack: reserved=241MB -6MB, committed=241MB -6MB)
(malloc=3MB #4130 -120)
(arena=2MB #1646 -48)
- Code (reserved=267MB, committed=145MB +1MB)
(malloc=24MB #33869 +368)
(mmap: reserved=244MB, committed=122MB +1MB)
- GC (reserved=1151MB +26MB, committed=1151MB +26MB)
(malloc=169MB +26MB #936843 +282881)
(mmap: reserved=982MB, committed=982MB)
- Compiler (reserved=2MB, committed=2MB)
(malloc=2MB #2930 +31)
- Internal (reserved=1817MB +571MB, committed=1817MB +571MB)
(malloc=1817MB +571MB #906346 +289268)
- Symbol (reserved=28MB, committed=28MB)
(malloc=24MB #255887 -135)
(arena=4MB #1)
- Native Memory Tracking (reserved=35MB +9MB, committed=35MB +9MB)
(tracking overhead=35MB +9MB)
- Tracing (reserved=12MB, committed=12MB)
(malloc=12MB #57235 -831)
- Unknown (reserved=50MB, committed=0MB)
(mmap: reserved=50MB, committed=0MB)
Milan Mimica, Software Engineer / Team Leader
[Visit Infobip
website]<http://www.infobip.com/?utm_source=Signature&utm_medium=Email&utm_campaign=Company>
[http://www.infobip.com/images/signatures/mwc17.jpg]
<http://www.infobip.com/en/campaigns/mwc-sweepstakes> It's time for Barcelona!
Meet us in hall 8.1, stand F49, 27 February-02 March!
<http://www.infobip.com/en/campaigns/mwc-sweepstakes>
Office: Mletacka 12/III, 52100 Pula, Croatia | Fax: +38552210979 | Mobile:
+385993061692
Email: milan.mim...@infobip.com | Skype: mmimicaib
www.infobip.com<http://www.infobip.com> / GSMA Associate Member / Mobey
Forum Member
This message is private and confidential. Any views or opinions expressed are
solely those of the author and do not necessarily represent those of Infobip
d.o.o. If you have received this message in error, please notify us immediately
via email to customer.supp...@infobip.com<mailto:customer.supp...@infobip.com>
or telephone +442032864235.
_______________________________________________
hotspot-gc-use mailing list
hotspot-gc-use@openjdk.java.net
http://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use
