JDK version is hotspot 8u_45
I explored the native memory of my Java process. Native memory even consumes more space than a bunch. However, there are many blocks of memory that confuse me. The result of pmap -x, for example:
00007f8128000000 65508 25204 25204 rw--- [ anon ]
00007f812bff9000 28 0 0 ----- [ anon ]
00007f812c000000 65508 24768 24768 rw--- [ anon ]
00007f812fff9000 28 0 0 ----- [ anon ]
00007f8130000000 65508 25532 25532 rw--- [ anon ]
00007f8133ff9000 28 0 0 ----- [ anon ]
00007f8134000000 65524 22764 22764 rw--- [ anon ]
00007f8137ffd000 12 0 0 ----- [ anon ]
00007f8138000000 65508 26456 26456 rw--- [ anon ]
00007f813bff9000 28 0 0 ----- [ anon ]
00007f813c000000 65508 23572 23572 rw--- [ anon ]
00007f813fff9000 28 0 0 ----- [ anon ]
00007f8140000000 65520 23208 23208 rw--- [ anon ]
00007f8143ffc000 16 0 0 ----- [ anon ]
00007f8144000000 65512 23164 23164 rw--- [ anon ]
00007f8147ffa000 24 0 0 ----- [ anon ]
00007f8148000000 65516 23416 23416 rw--- [ anon ]
00007f814bffb000 20 0 0 ----- [ anon ]
00007f814c000000 65508 23404 23404 rw--- [ anon ]
00007f814fff9000 28 0 0 ----- [ anon ]
00007f8150000000 65512 24620 24620 rw--- [ anon ]
00007f8153ffa000 24 0 0 ----- [ anon ]
00007f8154000000 65536 23976 23976 rw--- [ anon ]
00007f8158000000 65508 23652 23652 rw--- [ anon ]
00007f815bff9000 28 0 0 ----- [ anon ]
00007f815c000000 65508 23164 23164 rw--- [ anon ]
00007f815fff9000 28 0 0 ----- [ anon ]
00007f8160000000 65508 23344 23344 rw--- [ anon ]
00007f8163ff9000 28 0 0 ----- [ anon ]
00007f8164000000 65508 24052 24052 rw--- [ anon ]
00007f8167ff9000 28 0 0 ----- [ anon ]
00007f8168000000 131052 48608 48608 rw--- [ anon ]
00007f816fffb000 20 0 0 ----- [ anon ]
00007f8170000000 65516 23056 23056 rw--- [ anon ]
00007f8173ffb000 20 0 0 ----- [ anon ]
00007f8174000000 65516 26860 26860 rw--- [ anon ]
00007f8177ffb000 20 0 0 ----- [ anon ]
00007f8178000000 65508 23360 23360 rw--- [ anon ]
00007f817bff9000 28 0 0 ----- [ anon ]
00007f817c000000 65536 24856 24856 rw--- [ anon ]
00007f8180000000 65512 23272 23272 rw--- [ anon ]
00007f8183ffa000 24 0 0 ----- [ anon ]
00007f8184000000 65508 23688 23688 rw--- [ anon ]
00007f8187ff9000 28 0 0 ----- [ anon ]
00007f8188000000 65512 24024 24024 rw--- [ anon ]
00007f818bffa000 24 0 0 ----- [ anon ]
00007f818c000000 65508 25020 25020 rw--- [ anon ]
00007f818fff9000 28 0 0 ----- [ anon ]
00007f8190000000 65512 22868 22868 rw--- [ anon ]
00007f8193ffa000 24 0 0 ----- [ anon ]
00007f8194000000 65508 24156 24156 rw--- [ anon ]
00007f8197ff9000 28 0 0 ----- [ anon ]
00007f8198000000 65508 23684 23684 rw--- [ anon ]
There are many blocks that occupy about 64M.
I am using jcmd pid VM.native_memory to track these blocks of memory. However, I cannot find these blocks with any memory range specified as a result of jcmd.
In addition, I noticed an article that mentions the arena effect in malloc glic Java 8 and virtual memory in Linux . However, these blocks are different from the thread pool, because 1. The mode is rw---not -----2. The arena thread pool only affects virtual memory. He cannot explain this too much RSS.
gdb
dump binary memory mem.bin from to
mem.bin.1
mem.bin.2
mem.bin.3
mem.bin.4
30 , .
Google . :
, : zip inflates 2 . , .
: https://bugs.openjdk.java.net/browse/JDK-8164293. ?
, ?