I noticed lately that "pmap" and "ps" report different Resident Memory sizes on 
my system:

"ps" reports 2459500k:

# ps -e -o pid,pri,rss,vsz,args | grep 28023  | grep -v grep
28023  59 [b]2459500 [/b]6980072 /usr/local/java/jdk1.6.0.04/bin/amd64/java 
-Xms6144m -Xmx6144m ...

"pmap" reports 6940568K.

Any idea which number should I believe and what could have caused it?

Thanks 

Lieting

# pmap -x 28023
28023:  /usr/local/java/jdk1.6.0.04/bin/amd64/java -Xms6144m -Xmx6144m -ea:des
         Address     Kbytes        RSS       Anon     Locked Mode   Mapped File
0000000000400000         52         52          -         52 r-x--  java
000000000041C000          4          4          4          4 rw---  java
000000000041D000     575536     575536     235976     575536 rw---    [ heap ]
FFFFFD7E72186000         88         88         88         88 rw--R    [ anon ]
FFFFFD7E72286000         96         96         96         96 rw--R    [ anon ]
FFFFFD7E72385000        108        108        108        108 rw--R    [ anon ]
FFFFFD7E72483000        124        124        124        124 rw--R    [ stack 
tid=59 ]
FFFFFD7E7258E000         88         88         88         88 rw--R    [ stack 
tid=55 ]
FFFFFD7E7268E000         96         96         96         96 rw--R    [ stack 
tid=24 ]
FFFFFD7E72790000         96         96         96         96 rw--R    [ stack 
tid=23 ]
FFFFFD7E72891000        100        100        100        100 rw--R    [ stack 
tid=22 ]
FFFFFD7E72997000         84         84         84         84 rw--R    [ stack 
tid=21 ]
FFFFFD7E72A97000         92         92         92         92 rw--R    [ stack 
tid=20 ]
FFFFFD7E72AB0000         32         32          -         32 r-x--  libaio.so.1
FFFFFD7E72AC8000          4          4          4          4 rw---  libaio.so.1
FFFFFD7E72AC9000          4          4          -          4 rw---  libaio.so.1
FFFFFD7E72AD0000          4          4          4          4 rwx--    [ anon ]
FFFFFD7E72AE0000          8          8          -          8 r-x--  
liblbmaux.so.1
FFFFFD7E72AF1000          4          4          4          4 rw---  
liblbmaux.so.1
FFFFFD7E72B00000          4          4          4          4 rwx--    [ anon ]
FFFFFD7E72B10000        860        860          -        860 r-x--  liblbm.so.1
FFFFFD7E72BF6000         28         28         28         28 rw---  liblbm.so.1
FFFFFD7E72C00000       1488       1488          -       1488 r-x--  libCstd.so.1
FFFFFD7E72D83000        512        512         48        512 rw---  libCstd.so.1
FFFFFD7E72E10000         32         32          -         32 r-x--  librt.so.1
FFFFFD7E72E28000          4          4          4          4 rw---  librt.so.1
FFFFFD7E72E30000         52         52          -         52 r-x--  
liblbmmon.so.1
FFFFFD7E72E4C000          4          4          4          4 rw---  
liblbmmon.so.1
FFFFFD7E72E4D000          8          8          -          8 rw---  
liblbmmon.so.1
FFFFFD7E72E60000        108        108          -        108 r-x--  liblbmj.so
FFFFFD7E72E8A000          8          8          8          8 rw---  liblbmj.so
FFFFFD7E72F86000         96         96         96         96 rw--R    [ stack 
tid=19 ]
FFFFFD7E72FA0000         64         64         64         64 rwx--    [ anon ]
FFFFFD7E72FC0000        116        116          -        116 r-x--  
libdesjni0.1.so
FFFFFD7E72FEC000         12         12         12         12 rw---  
libdesjni0.1.so
FFFFFD7E730DE000         96         96         96         96 rw--R    [ stack 
tid=18 ]
FFFFFD7E731DC000        112        112        112        112 rw--R    [ stack 
tid=17 ]
FFFFFD7E732E5000         84         84         84         84 rw--R    [ stack 
tid=16 ]
FFFFFD7E733FB000          4          4          4          4 rw--R    [ stack 
tid=15 ]
FFFFFD7E734E8000         88         88         88         88 rw--R    [ stack 
tid=14 ]
FFFFFD7E73500000        316        316          -        316 r-x--  
pkcs11_softtoken.so.1
FFFFFD7E7355F000         12         12          8         12 rw---  
pkcs11_softtoken.so.1
FFFFFD7E73570000          4          4          4          4 rwx--    [ anon ]
FFFFFD7E73580000         16         16          -         16 r-x--  
libpthread.so.1
FFFFFD7E73590000          4          4          4          4 rwx--    [ anon ]
FFFFFD7E735A0000          4          4          4          4 rwx--    [ anon ]
FFFFFD7E735B0000         24         24          -         24 r-x--  
libcryptoutil.so.1
FFFFFD7E735C6000          8          8          8          8 rw---  
libcryptoutil.so.1
FFFFFD7E735D0000          4          4          4          4 rwx--    [ anon ]
FFFFFD7E735E0000        128        128          -        128 r-x--  
libpkcs11.so.1
FFFFFD7E73600000          4          4          4          4 rw---  
libpkcs11.so.1
FFFFFD7E73601000          4          4          4          4 rw---  
libpkcs11.so.1
FFFFFD7E73610000         60         60          -         60 r-x--  
libj2pkcs11.so
FFFFFD7E7362E000          4          4          4          4 rw---  
libj2pkcs11.so
FFFFFD7E73639000       1088       1088          -       1088 r--s-  dev:85,116 
ino:5845
FFFFFD7E7374B000       1112       1112          -       1112 r--s-  dev:85,116 
ino:5826
FFFFFD7E73962000          4          4          4          4 rw--R    [ stack 
tid=13 ]
FFFFFD7E73A5A000         44         44         44         44 rw--R    [ stack 
tid=12 ]
FFFFFD7E73B57000          4          4          4          4 rw--R    [ anon ]
FFFFFD7E73B5C000         44         44         44         44 rw--R    [ stack 
tid=11 ]
FFFFFD7E73C68000          4          4          4          4 rw--R    [ stack 
tid=10 ]
FFFFFD7E73D55000         88         88         88         88 rw--R    [ stack 
tid=9 ]
FFFFFD7E73E58000         84         84         84         84 rw--R    [ stack 
tid=8 ]
FFFFFD7E73F6B000         16         16         16         16 rw--R    [ stack 
tid=7 ]
FFFFFD7E73F71000       1580       1580          -       1580 r--s-  dev:85,30 
ino:34133
FFFFFD7E741FC000          8          8          8          8 rw--R    [ stack 
tid=4 ]
FFFFFD7E74200000       8192       8192       8184       8192 rwx--    [ anon ]
FFFFFD7E74A10000          4          4          4          4 rwx--    [ anon ]
FFFFFD7E74A20000          4          4          4          4 rwx--    [ anon ]
FFFFFD7E74A2B000         28         28          -         28 r--s-  dev:85,30 
ino:34132
FFFFFD7E74A34000         12         12          -         12 r--s-  dev:85,30 
ino:34022
FFFFFD7E74A43000         12         12          -         12 r--s-  dev:85,30 
ino:34105
FFFFFD7E74A50000         16         16          -         16 r--s-  dev:85,116 
ino:5850
FFFFFD7E74A5E000         20         20          -         20 r--s-  dev:85,116 
ino:5849
FFFFFD7E74A70000         20         20          -         20 r--s-  dev:85,116 
ino:5848
FFFFFD7E74A7A000          8          8          -          8 r--s-  dev:85,116 
ino:5847
FFFFFD7E74A87000         20         20          -         20 r--s-  dev:85,116 
ino:5846
FFFFFD7E74A9C000         64         64          -         64 r--s-  dev:85,116 
ino:5844
FFFFFD7E74AAE000         64         64          -         64 r--s-  dev:85,116 
ino:5843
FFFFFD7E74AC0000         64         64         64         64 rwx--    [ anon ]
FFFFFD7E74BD0000          8          8          8          8 rw--R    [ stack 
tid=3 ]
FFFFFD7E74BD4000         44         44         44         44 rwx--    [ anon ]
FFFFFD7E74C00000         44         44         44         44 rwx--    [ anon ]
FFFFFD7E74C2A000       8192       8192       8176       8192 rwx--    [ anon ]
FFFFFD7E7542A000       4096       4096       4096       4096 rwx--    [ anon ]
FFFFFD7E7582A000          4          4          4          4 rwx--    [ anon ]
FFFFFD7E75837000        224        224          -        224 r--s-  dev:85,116 
ino:5842
FFFFFD7E75871000          4          4          -          4 r--s-  dev:85,116 
ino:5841
FFFFFD7E75882000          4          4          -          4 r--s-  dev:85,116 
ino:5840
FFFFFD7E75886000         32         32          -         32 r--s-  dev:85,116 
ino:5839
FFFFFD7E75898000         36         36          -         36 r--s-  dev:85,116 
ino:5838
FFFFFD7E758AD000         96         96          -         96 r--s-  dev:85,116 
ino:5837
FFFFFD7E758C7000         28         28          -         28 r--s-  dev:85,116 
ino:5836
FFFFFD7E758D1000         12         12          -         12 r--s-  dev:85,116 
ino:5835
FFFFFD7E758DC000          8          8          -          8 r--s-  dev:85,116 
ino:5834
FFFFFD7E758E3000        100        100          -        100 r--s-  dev:85,116 
ino:5832
FFFFFD7E759FC000          8          8          8          8 rw--R    [ stack 
tid=6 ]
FFFFFD7E75A00000      22528      22528      18432      22528 rwx--    [ anon ]
FFFFFD7E7AE00000    4194304    4194304      57344    4194304 rwx--    [ anon ]
FFFFFD7F7AE00000    2097152    2097152    2097152    2097152 rwx--    [ anon ]
FFFFFD7FFAE0E000        176        176          -        176 r--s-  dev:85,116 
ino:5830
FFFFFD7FFAF3A000          8          8          8          8 rw--R    [ stack 
tid=5 ]
FFFFFD7FFAF3E000         40         40         40         40 rwx--    [ anon ]
FFFFFD7FFB000000       4096       4096       4096       4096 rwx--    [ anon ]
FFFFFD7FFE004000          8          8          -          8 r--s-  dev:85,116 
ino:5833
FFFFFD7FFE016000          4          4          -          4 r--s-  dev:85,116 
ino:5828
FFFFFD7FFE022000        112        112          -        112 r--s-  dev:85,116 
ino:5827
FFFFFD7FFE040000         28         28          -         28 r-x--  
libmanagement.so
FFFFFD7FFE056000          4          4          4          4 rw---  
libmanagement.so
FFFFFD7FFE060000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFE070000         72         72          -         72 r-x--  libnet.so
FFFFFD7FFE091000          8          8          8          8 rw---  libnet.so
FFFFFD7FFE0A0000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFE0B0000         64         64          -         64 r-x--  libzip.so
FFFFFD7FFE0CF000         12         12         12         12 rw---  libzip.so
FFFFFD7FFE0E0000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFE0F0000        188        188          -        188 r-x--  libjava.so
FFFFFD7FFE12E000         16         16         16         16 rw---  libjava.so
FFFFFD7FFE140000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFE150000         68         68          -         68 r-x--  libverify.so
FFFFFD7FFE170000          8          8          8          8 rw---  libverify.so
FFFFFD7FFE182000          4          4          -          4 r--s-  dev:85,116 
ino:5831
FFFFFD7FFE186000         20         20          -         20 r--s-  dev:85,116 
ino:5829
FFFFFD7FFE190000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFE1A0000         40         40          -         40 r-x--  libhpi.so
FFFFFD7FFE1B9000          4          4          4          4 rw---  libhpi.so
FFFFFD7FFE1BA000         20         20          -         20 rw---  libhpi.so
FFFFFD7FFE1D0000         32         32          -         32 rw-s-  dev:274,2 
ino:4075970133
FFFFFD7FFE1E0000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFE1F0000          4          4          -          4 r----    [ anon ]
FFFFFD7FFE1FA000          4          4          -          4 rwxs-    [ anon ]
FFFFFD7FFE2EC000        128        128        128        128 rw--R    [ stack 
tid=2 ]
FFFFFD7FFE30E000         64         64         64         64 rw---    [ anon ]
FFFFFD7FFE320000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFE330000         16         16          -         16 r-x--  libmp.so.2
FFFFFD7FFE344000          4          4          4          4 rw---  libmp.so.2
FFFFFD7FFE350000          8          8          -          8 r-x--  libmd5.so.1
FFFFFD7FFE362000          4          4          4          4 rw---  libmd5.so.1
FFFFFD7FFE370000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFE380000         28         28          -         28 r-x--  libgen.so.1
FFFFFD7FFE397000          4          4          4          4 rw---  libgen.so.1
FFFFFD7FFE3A0000         36         36          -         36 r-x--  
libuutil.so.1
FFFFFD7FFE3B9000          4          4          4          4 rw---  
libuutil.so.1
FFFFFD7FFE3C0000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFE3D0000        100        100          -        100 r-x--  libscf.so.1
FFFFFD7FFE3F9000          4          4          4          4 rw---  libscf.so.1
FFFFFD7FFE400000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFE410000        348        348          -        348 r-x--  libm.so.2
FFFFFD7FFE476000         24         24         12         24 rw---  libm.so.2
FFFFFD7FFE480000        664        664          -        664 r-x--  libnsl.so.1
FFFFFD7FFE536000         16         16         16         16 rw---  libnsl.so.1
FFFFFD7FFE53A000         36         36         20         36 rw---  libnsl.so.1
FFFFFD7FFE550000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFE560000          8          8          -          8 r-x--  libdoor.so.1
FFFFFD7FFE572000          4          4          4          4 rw---  libdoor.so.1
FFFFFD7FFE580000         52         52          -         52 r-x--  libCrun.so.1
FFFFFD7FFE59C000         12         12         12         12 rw---  libCrun.so.1
FFFFFD7FFE59F000         20         20          8         20 rw---  libCrun.so.1
FFFFFD7FFE5B0000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFE5C0000         16         16          -         16 r-x--  libm.so.1
FFFFFD7FFE5D3000          4          4          4          4 rw---  libm.so.1
FFFFFD7FFE5DE000         64         64         64         64 rw---    [ anon ]
FFFFFD7FFE5F0000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFE600000      11260      11260          -      11260 r-x--  libjvm.so
FFFFFD7FFF100000        516        516        512        516 rw---  libjvm.so
FFFFFD7FFF181000        128        128        120        128 rw---  libjvm.so
FFFFFD7FFF1B0000         60         60          -         60 r-x--  
libsocket.so.1
FFFFFD7FFF1CF000          4          4          4          4 rw---  
libsocket.so.1
FFFFFD7FFF1E0000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFF1F0000          4          4          -          4 r-x--  
libsched.so.1
FFFFFD7FFF200000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFF210000        900        900          -        900 r-x--  libc.so.1
FFFFFD7FFF301000         28         28         28         28 rw---  libc.so.1
FFFFFD7FFF308000         16         16         12         16 rw---  libc.so.1
FFFFFD7FFF310000          4          4          -          4 r-x--  libdl.so.1
FFFFFD7FFF321000          4          4          4          4 rw---  libdl.so.1
FFFFFD7FFF330000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFF340000         36         36          -         36 r-x--  libjli.so
FFFFFD7FFF358000          8          8          8          8 rw---  libjli.so
FFFFFD7FFF360000         20         20          -         20 r-x--  
libthread.so.1
FFFFFD7FFF370000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFF380000          4          4          -          4 r-x--  
mlockall.so.1
FFFFFD7FFF390000          4          4          4          4 rw---  
mlockall.so.1
FFFFFD7FFF3A0000         24         24         20         24 rwx--    [ anon ]
FFFFFD7FFF3B0000          4          4          4          4 rwx--    [ anon ]
FFFFFD7FFF3B5000        212        212          -        212 r-x--  ld.so.1
FFFFFD7FFF3FA000          8          8          8          8 rwx--  ld.so.1
FFFFFD7FFF3FC000          8          8          8          8 rwx--  ld.so.1
FFFFFD7FFFDFB000         20         20          4         20 rw---    [ stack ]
---------------- ---------- ---------- ---------- ----------
        total Kb    6940568    [b]6940568    [/b]2436872    6940568
 
 
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