Hi
SITUATION - On a production APP Server having about 4000 Concurrent application
processes ,
the memory allocated does NOT seem to be getting freed even though the application
program is issuing the respective call to Free the memory .
Qs Any /etc/system parameters , OS patches which should help ?
Qs Is our approach of using the pmap command Correct ?
else what Command to find the "Private" memory taken up by a process would be
advisable ?
Qs How to find the Total Amount of Swap Consumed ?
[ We probably do NOT know how to interpret the vmstat output Correctly ,
top/swap -s commands show an output Differing greatly from df -k output for /tmp
filesystem ]
Qs Any Body has encountered such as situation before ?
Configuration -
Solaris 2.8
Patch - Generic 108528-16 patch
Machine SF15K
CPUs = 36
RAM = 96 GB
We created a Small Sample C program which allocates & FREEs memory but found that even
after
FREEing , the memory does NOT show as Freed in the pmap output . Is the following
approach correct ?
DETAILS :-
@@@@@@@@@@@@@@@@@ SAMPLE C PROGRAM @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
#include <stdio.h>
main()
{
char *abc = NULL ;
int i = 0 ;
for (i = 1; i < 10; i++){
printf("allocating [%d] bytes\n", 10*1024*(i+1));
abc = (char *)malloc(10*1024*(i+1));
memset(abc, '\0', 10*1024*(i+1));
getchar();
free(abc);
printf("Freeing [%d]\n", i);
getchar();
}
exit() ;
}
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
RUN Output :-
STEP 1 - allocating [20480] bytes
pmap -x <PID of Above program process>
Address Kbytes Resident Shared Private Permissions Mapped File
00010000 8 8 8 - read/exec a.out
00020000 8 8 - 8 read/write/exec a.out
00022000 24 24 - 24 read/write/exec [ heap ]
FF280000 688 688 688 - read/exec libc.so.1
FF33C000 32 32 - 32 read/write/exec libc.so.1
FF370000 16 16 16 - read/exec libc_psr.so.1
FF390000 8 8 8 - read/exec libdl.so.1
FF3A0000 8 8 - 8 read/write/exec [ anon ]
FF3B0000 152 152 152 - read/exec ld.so.1
FF3E6000 8 8 - 8 read/write/exec ld.so.1
FFBEC000 16 16 - 16 read/write/exec [ stack ]
-------- ------ ------ ------ ------
total Kb 968 968 872 96
THE "Private" memory allocated by the [ heap ] is 24 K
STEP 2 - Freeing the memory allocated in the above Step
Freeing [1]
pmap -x <PID of Above program process>
Address Kbytes Resident Shared Private Permissions Mapped File
00022000 24 24 - 24 read/write/exec [ heap ]
RESULT - THE "Private" memory allocated previously does NOT get Freed &
[ heap ] continues to be 24 K
STEP 3 -
allocating [30720] bytes
pmap -x <PID of Above Program process>
Address Kbytes Resident Shared Private Permissions Mapped File
00022000 32 32 - 32 read/write/exec [ heap ]
STEP 4 - Freeing the memory allocated in the above Step
Freeing [2]
pmap -x <PID of Above program process>
Address Kbytes Resident Shared Private Permissions Mapped File
00022000 32 32 - 32 read/write/exec [ heap ]
RESULT - THE "Private" memory allocated previously in Step 3 does NOT get Freed &
[ heap ] continues to be 32 K
Thanks
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Author: VIVEK_SHARMA
INET: [EMAIL PROTECTED]
Fat City Network Services -- 858-538-5051 http://www.fatcity.com
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