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
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