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11月前
jvm堆外内存分析
问题描述:
某一个系统生产环境java进程占用2.5GB内存,但是堆的最大内存1.5GB,导致容器会重启,启动参数为:-Xms1536M -Xmx1536M -XX:NativeMemoryTracking=detail -Xss512k -XX:MaxDirectMemorySize=128m -XX:MetaspaceSize=384m -XX:MaxMetaspaceSize=512m -XX:MaxRAM=3G -XX:MaxRAMPercentage=85 -XX:HeapDumpPath=$$HEAP_DUMP_PATH
以下是刚开始执行的jcmd <pid> VM.native_memory summary命令:
Native Memory Tracking:
(Omitting categories weighting less than 1KB)
Total: reserved=2794695KB, committed=2189275KB
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Java Heap (reserved=1572864KB, committed=1572864KB) (mmap: reserved=1572864KB, committed=1572864KB)
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Class (reserved=428242KB, committed=35282KB) (classes #43084) ( instance classes #40821, array classes #2263) (malloc=6354KB #127216) (mmap: reserved=421888KB, committed=28928KB) ( Metadata: ) ( reserved=212992KB, committed=205440KB) ( used=203944KB) ( waste=1496KB =0.73%) ( Class space:) ( reserved=421888KB, committed=28928KB) ( used=26995KB) ( waste=1933KB =6.68%)
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Thread (reserved=99519KB, committed=19791KB) (thread #182) (stack: reserved=98992KB, committed=19264KB) (malloc=316KB #1092) (arena=211KB #361)
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Code (reserved=257640KB, committed=132576KB) (malloc=9952KB #39826) (mmap: reserved=247688KB, committed=122624KB)
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GC (reserved=102252KB, committed=102252KB) (malloc=10908KB #65717) (mmap: reserved=91344KB, committed=91344KB)
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Compiler (reserved=1618KB, committed=1618KB) (malloc=1453KB #3302) (arena=165KB #5)
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Internal (reserved=8142KB, committed=8142KB) (malloc=8106KB #65996) (mmap: reserved=36KB, committed=36KB)
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Other (reserved=28023KB, committed=28023KB) (malloc=28023KB #225)
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Symbol (reserved=43385KB, committed=43385KB) (malloc=41299KB #1019999) (arena=2086KB #1)
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Native Memory Tracking (reserved=21761KB, committed=21761KB)
(malloc=635KB #9047)
(tracking overhead=21126KB) -
Shared class space (reserved=12288KB, committed=12172KB) (mmap: reserved=12288KB, committed=12172KB)
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Arena Chunk (reserved=181KB, committed=181KB) (malloc=181KB)
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Tracing (reserved=32KB, committed=32KB) (arena=32KB #1)
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Logging (reserved=5KB, committed=5KB) (malloc=5KB #220)
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Arguments (reserved=3KB, committed=3KB) (malloc=3KB #99)
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Module (reserved=3009KB, committed=3009KB) (malloc=3009KB #11506)
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Safepoint (reserved=8KB, committed=8KB) (mmap: reserved=8KB, committed=8KB)
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Synchronization (reserved=554KB, committed=554KB) (malloc=554KB #4655)
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Serviceability (reserved=4KB, committed=4KB) (malloc=4KB #23)
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Metaspace (reserved=215164KB, committed=207612KB) (malloc=2172KB #2650) (mmap: reserved=212992KB, committed=205440KB)
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String Deduplication (reserved=1KB, committed=1KB) (malloc=1KB #8)
目前容器4天左右重启一次
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