Why is java process using much more memory than expected
SystemInfo
OS: archlinux
JDK: OpenJDK (IcedTea 2.4.3) (ArchLinux Build 7.u45_2.4.3-1-x86_64)
Application launch: https://github.com/aemoncannon/ensime
My java options:
-Xms128m -Xmx512M -Xss1M -XX:MaxPermSize=50m
-XX:MaxDirectMemorySize=10M
-XX:ReservedCodeCacheSize=64m
-Dfile.encoding=UTF-8 -XX:NativeMemoryTracking=detai
shows the best Linux commands, uses 6.8G * 19.5% = 1.326GB
Natvie's memory tracking shows it is using 713MB
So. Which one is actually the physical memory use, and if it uses 1.3GB memory where is the additional 600 + MB physical memory?
Upper outputs
top - 09:20:37 up 48 min, 2 users, load average: 0.31, 0.33, 0.36
Tasks: 161 total, 1 running, 159 sleeping, 0 stopped, 1 zombie
%Cpu(s): 0.7 us, 0.3 sy, 0.0 ni, 99.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0
KiB Mem: 7091684 total, 4338428 used, 2753256 free, 117044 buffers
KiB Swap: 8388604 total, 0 used, 8388604 free, 1399904 cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5666 jilen 20 0 3553516 1.317g 22652 S 0.3 19.5 2:27.72 java
Raw memory for memory tracking (jcmd VM.native_memory detail)
Native Memory Tracking:
Total: reserved=731125KB, committed=681117KB
- Java Heap (reserved=575488KB, committed=574976KB)
(mmap: reserved=575488KB, committed=574976KB)
- Class (reserved=6388KB, committed=6388KB)
(classes #6443)
(malloc=6388KB, #16725)
- Thread (reserved=27986KB, committed=27986KB)
(thread #27)
(stack: reserved=27756KB, committed=27756KB)
(malloc=82KB, #114)
(arena=148KB, #54)
- Code (reserved=70523KB, committed=21059KB)
(malloc=3963KB, #6149)
(mmap: reserved=66560KB, committed=17096KB)
- GC (reserved=26964KB, committed=26964KB)
(malloc=5900KB, #158)
(mmap: reserved=21064KB, committed=21064KB)
- Compiler (reserved=176KB, committed=176KB)
(malloc=78KB, #238)
(arena=98KB, #2)
- Internal (reserved=5463KB, committed=5431KB)
(malloc=5431KB, #1492)
(mmap: reserved=32KB, committed=0KB)
- Symbol (reserved=10668KB, committed=10668KB)
(malloc=9765KB, #77949)
(arena=903KB, #1)
- Memory Tracking (reserved=5616KB, committed=5616KB)
(malloc=5616KB, #120)
- Pooled Free Chunks (reserved=1854KB, committed=1854KB)
(malloc=1854KB)
Virtual memory map:
[0x00000000dce00000 - 0x0000000100000000] reserved 575488KB for Java Heap
from [JVM_handle_linux_signal+0x173dbd]
[0x00000000dce00000 - 0x00000000fff80000] committed 574976KB from [JVM_handle_linux_signal+0x650ab]
[0x00007f53801c7000 - 0x00007f53802c8000] reserved 1028KB for Thread Stack
from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f53801c7000 - 0x00007f53802c8000] committed 1028KB from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f5381daf000 - 0x00007f5381eb0000] reserved 1028KB for Thread Stack
from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f5381daf000 - 0x00007f5381eb0000] committed 1028KB from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f53821f0000 - 0x00007f53824f3000] reserved 3084KB for Thread Stack
from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f53821f0000 - 0x00007f53824f3000] committed 3084KB from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f5382d49000 - 0x00007f5382e4a000] reserved 1028KB for Thread Stack
from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f5382d49000 - 0x00007f5382e4a000] committed 1028KB from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f538302a000 - 0x00007f538342e000] reserved 4112KB for Thread Stack
from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f538302a000 - 0x00007f538342e000] committed 4112KB from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f53b47c7000 - 0x00007f53b4aca000] reserved 3084KB for Thread Stack
from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f53b47c7000 - 0x00007f53b4aca000] committed 3084KB from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f53b4db7000 - 0x00007f53b4eb8000] reserved 1028KB for Thread Stack
from [JVM_handle_linux_signal+0x127be9]
[0x00007f53b4db7000 - 0x00007f53b4eb8000] committed 1028KB from [JVM_handle_linux_signal+0x127be9]
[0x00007f53b4eb8000 - 0x00007f53b52bc000] reserved 4112KB for Thread Stack
from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f53b4eb8000 - 0x00007f53b52bc000] committed 4112KB from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f53b5894000 - 0x00007f53b5a96000] reserved 2056KB for Thread Stack
from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f53b5894000 - 0x00007f53b5a96000] committed 2056KB from [JVM_handle_linux_signal+0x12f2ec]
[0x00007f53b5a96000 - 0x00007f53b5b97000] reserved 1028KB for Thread Stack
from [JVM_handle_linux_signal+0x17c90d]
[0x00007f53b5a96000 - 0x00007f53b5b97000] committed 1028KB from [JVM_handle_linux_signal+0x17c90d]
[0x00007f53b5b97000 - 0x00007f53b5c98000] reserved 1028KB for Thread Stack
from [JVM_FindSignal+0x118f1b]
[0x00007f53b5b97000 - 0x00007f53b5c98000] committed 1028KB from [JVM_FindSignal+0x118f1b]
[0x00007f53b6e70000 - 0x00007f53b8000000] reserved 17984KB for GC
from [JVM_handle_linux_signal+0x172529]
[0x00007f53b6e70000 - 0x00007f53b8000000] committed 17984KB from [JVM_handle_linux_signal+0x650ab]
[0x00007f53c4000000 - 0x00007f53c8000000] reserved 65536KB for Code
from [JVM_handle_linux_signal+0x1741a5]
[0x00007f53c4000000 - 0x00007f53c5070000] committed 16832KB from [JVM_handle_linux_signal+0x1746f4]
[0x00007f53cc0e4000 - 0x00007f53cc1fd000] reserved 1124KB for GC
from [JVM_handle_linux_signal+0x172529]
[0x00007f53cc0e4000 - 0x00007f53cc1fd000] committed 1124KB from [JVM_handle_linux_signal+0x650ab]
[0x00007f53cc1fd000 - 0x00007f53cc601000] reserved 4112KB for Thread Stack
from [AsyncGetCallTrace+0x3949c]
[0x00007f53cc1fd000 - 0x00007f53cc601000] committed 4112KB from [AsyncGetCallTrace+0x3949c]
[0x00007f53cc601000 - 0x00007f53cc71b000] reserved 1128KB for GC
from [JVM_handle_linux_signal+0x172529]
[0x00007f53cc601000 - 0x00007f53cc71b000] committed 1128KB from [dlerror+0x3aad37]
[0x00007f53cc71b000 - 0x00007f53cc81b000] reserved 1024KB for Code
from [JVM_handle_linux_signal+0x172289]
[0x00007f53cc71b000 - 0x00007f53cc75d000] committed 264KB from [JVM_handle_linux_signal+0x1746f4]
[0x00007f53cf497000 - 0x00007f53cf4a2000] reserved 44KB for GC
from [JVM_handle_linux_signal+0x172529]
[0x00007f53cf497000 - 0x00007f53cf54d000] committed 728KB from [JVM_handle_linux_signal+0x650ab]
[0x00007f53cf4a2000 - 0x00007f53cf54d000] reserved 684KB for GC
from [JVM_handle_linux_signal+0x172289]
[0x00007f53cf54d000 - 0x00007f53cf64e000] reserved 1028KB for Thread Stack
from [JVM_handle_linux_signal+0x12c997]
[0x00007f53cf54d000 - 0x00007f53cf64e000] committed 1028KB from [JVM_handle_linux_signal+0x12c997]
[0x00007f53cf656000 - 0x00007f53cf66f000] reserved 100KB for GC
from [JVM_handle_linux_signal+0x172289]
[0x00007f53cf656000 - 0x00007f53cf66f000] committed 100KB from [JVM_handle_linux_signal+0x650ab]
[0x00007f53cf66f000 - 0x00007f53cf677000] reserved 32KB for Internal
from [JVM_handle_linux_signal+0x3c924]
Details:
[0x00007f53ce330855] JVM_handle_linux_signal+0xee085
(malloc=6627KB #77628)
[0x00007f53ce291061] JVM_handle_linux_signal+0x4e891
(malloc=5120KB #5)
[0x00007f53ce293021] JVM_handle_linux_signal+0x50851
(malloc=5120KB #5)
[0x00007f53ce2a19b5] JVM_handle_linux_signal+0x5f1e5
(malloc=5120KB #5)
[0x00007f53ce1c8c64] JVM_FindSignal+0x1188f4
(malloc=4040KB #1)
[0x00007f53cde99851] dlerror+0x409851
(malloc=3903KB #5678)
[0x00007f53cdd2dcb3] dlerror+0x29dcb3
(malloc=2643KB #148)
[0x00007f53cdff5b86] AsyncGetCallTrace+0x6dc46
(malloc=2512KB #314)
[0x00007f53ce1c0b17] JVM_FindSignal+0x1107a7
(malloc=1274KB #106)
[0x00007f53ce291149] JVM_handle_linux_signal+0x4e979
(malloc=640KB #5)
[0x00007f53ce233375] JVM_FindSignal+0x183005
(malloc=524KB #419)
[0x00007f53ce38c670] JVM_handle_linux_signal+0x149ea0
(malloc=469KB #1)
[0x00007f53cde87c53] dlerror+0x3f7c53
(malloc=408KB #16085)
[0x00007f53cdd2d142] dlerror+0x29d142
(malloc=360KB #1)
[0x00007f53cdff5186] AsyncGetCallTrace+0x6d246
(malloc=310KB #25)
[0x00007f53ce38c581] JVM_handle_linux_signal+0x149db1
(malloc=156KB #1)
[0x00007f53cdd38523] dlerror+0x2a8523
(malloc=127KB #681)
[0x00007f53ce1c5acb] JVM_FindSignal+0x11575b
(malloc=96KB #2)
[0x00007f53ce1c807e] JVM_FindSignal+0x117d0e
(malloc=96KB #1)
[0x00007f53ce38e0e4] JVM_handle_linux_signal+0x14b914
(malloc=80KB #5)
[0x00007f53ce368abd] JVM_handle_linux_signal+0x1262ed
(malloc=71KB #25)
[0x00007f53ce1b4c27] JVM_FindSignal+0x1048b7
(malloc=64KB #16)
[0x00007f53ce1b4c97] JVM_FindSignal+0x104927
(malloc=64KB #16)
[0x00007f53ce25c867] JVM_handle_linux_signal+0x1a097
(malloc=55KB #116)
[0x00007f53ce1c0584] JVM_FindSignal+0x110214
(malloc=51KB #1)
[0x00007f53ce1c5a15] JVM_FindSignal+0x1156a5
(malloc=48KB #1)
[0x00007f53cdea0fc3] dlerror+0x410fc3
(malloc=37KB #464)
[0x00007f53cdf169bd] dlerror+0x4869bd
(malloc=36KB #13)
[0x00007f53ce3b2aa7] JVM_handle_linux_signal+0x1702d7
(malloc=24KB #13)
[0x00007f53cdff6496] AsyncGetCallTrace+0x6e556
(malloc=20KB #4)
[0x00007f53cdeb2ff3] dlerror+0x422ff3
(malloc=17KB #180)
[0x00007f53ce27ba1b] JVM_handle_linux_signal+0x3924b
(malloc=15KB #255)
[0x00007f53ce368b9d] JVM_handle_linux_signal+0x1263cd
(malloc=10KB #1)
[0x00007f53ce367fdb] JVM_handle_linux_signal+0x12580b
(malloc=8KB #47)
[0x00007f53cdff2df5] AsyncGetCallTrace+0x6aeb5
(malloc=8KB #11)
[0x00007f53cdf5d7d4] dlerror+0x4cd7d4
(malloc=8KB #1)
[0x00007f53ce289bc4] JVM_handle_linux_signal+0x473f4
(malloc=8KB #1)
[0x00007f53ce2059d6] JVM_FindSignal+0x155666
(malloc=7KB #62)
[0x00007f53ce27bb04] JVM_handle_linux_signal+0x39334
(malloc=7KB #251)
[0x00007f53ce242453] fork1+0x52b3
(malloc=6KB #28)
[0x00007f53ce024918] AsyncGetCallTrace+0x9c9d8
(malloc=5KB #18)
[0x00007f53cdd2d333] dlerror+0x29d333
(malloc=2KB #57)
[0x00007f53ce36a598] JVM_handle_linux_signal+0x127dc8
(malloc=2KB #1)
[0x00007f53ce2d6e24] JVM_handle_linux_signal+0x94654
(malloc=2KB #1)
[0x00007f53ce290d96] JVM_handle_linux_signal+0x4e5c6
(malloc=2KB #5)
[0x00007f53ce2a1536] JVM_handle_linux_signal+0x5ed66
(malloc=2KB #5)
[0x00007f53ce25a49b] JVM_handle_linux_signal+0x17ccb
(malloc=2KB #7)
[0x00007f53cde881eb] dlerror+0x3f81eb
(malloc=1KB #15)
[0x00007f53ce171720] JVM_FindSignal+0xc13b0
(malloc=1KB #74)
[0x00007f53cdf5ef54] dlerror+0x4cef54
(malloc=1KB #1)
[0x00007f53cde8a8aa] dlerror+0x3fa8aa
(malloc=1KB #59)
[0x00007f53ce3b658d] JVM_handle_linux_signal+0x173dbd
(mmap: reserved=575488KB, committed=574976KB)
[0x00007f53ce3b6975] JVM_handle_linux_signal+0x1741a5
(mmap: reserved=65536KB, committed=16832KB)
[0x00007f53ce3b4cf9] JVM_handle_linux_signal+0x172529
(mmap: reserved=20280KB, committed=20280KB)
[0x00007f53ce371abc] JVM_handle_linux_signal+0x12f2ec
(mmap: reserved=19532KB, committed=19532KB)
[0x00007f53cdfc13dc] AsyncGetCallTrace+0x3949c
(mmap: reserved=4112KB, committed=4112KB)
[0x00007f53ce3b4a59] JVM_handle_linux_signal+0x172289
(mmap: reserved=1808KB, committed=1048KB)
[0x00007f53ce1c928b] JVM_FindSignal+0x118f1b
(mmap: reserved=1028KB, committed=1028KB)
[0x00007f53ce36a3b9] JVM_handle_linux_signal+0x127be9
(mmap: reserved=1028KB, committed=1028KB)
[0x00007f53ce36f167] JVM_handle_linux_signal+0x12c997
(mmap: reserved=1028KB, committed=1028KB)
[0x00007f53ce3bf0dd] JVM_handle_linux_signal+0x17c90d
(mmap: reserved=1028KB, committed=1028KB)
[0x00007f53ce27f0f4] JVM_handle_linux_signal+0x3c924
(mmap: reserved=32KB, committed=0KB)
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1 answer
The RES or% MEM value is the actual physical memory usage.
Since your system is not under memory pressure at all, no attempt is made to reclaim physical memory. This is due to the fact that such an effort is a lost offer. If the memory is not quickly used for some other purpose, efforts to free it are lost. If the memory is being used anytime soon for some other purpose, the effort to free it is worse than wasted, it must be canceled in order to use the memory again. Modern operating systems move directly from one memory to another when memory is required, without having to free that memory. The memory is released only when there is no other choice.
So, basically, physical memory is temporarily lost until the system can find more efficient use of it. If other tasks are running on the computer that is consuming physical memory, you will see the RES and% MEM values decrease as physical memory changes to a different use.
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