Imapd service "Leak Memory"

Question

I already have Java Communications Suite 6 Working , but, I have a Leak Memory problems with imapd process.
I have the server with 30 imapd process, 30 mshttpd process, and 30 pop process running to balance the load of the users.
All work fine(the CPU is 100% idle, the RAM is 80% available=6GB) when I access via browser(Chrome,Firefox), too when I access it with the traditional clients IMAP (Outlook, ThunderBird,etc).
The problem is that if one user want to copy(not just view) locally all your emails to your laptops/pc, the imapd process eat more than 3GB(instead of 80MB) of RAM and the system is getting slower.
If the user cancel this process(copy via IMAP all your emails) the process dont freedom doesn't release the memory and the system getting slower.
Actually my solution is:
# kill -9 <PID_imapd>
Some times when I kill the process the problem going to other imapd process, so in this case the solution is:
/opt/sun/comms/messaging/sbin/stop-msg
/opt/sun/comms/messaging/sbin/start-msg
I think that this problem is a bug but I dont know what is the patch.
May you help me? Any idea?
My system is:
A X2100 with one socket AMD Opteron 2600Mhz, 8GB RAM, 2 x disks 750GB in mirror with Solaris Volume Manager, Soalris 10 HW 10/08.
Thanks.
Jaime

Answer 1

Jorth, maybe we are not well explained,
the normal operation of imapd process(one process) need no more that 200MB, when a user is linked to it.
Check my example:
================================================================================================================
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
874 root 610M 421M sleep 59 0 0:14:51 0.1% java/160
818 webservd 413M 285M sleep 59 0 0:16:43 0.3% webservd/95
607 root 326M 45M sleep 59 0 0:07:01 0.1% webservd/58
16719 mailsrv 283M 50M sleep 59 0 0:00:06 0.0% imapd/5
798 root 237M 37M sleep 59 0 0:04:04 0.1% ns-slapd/48
*16673 mailsrv 220M 97M sleep 59 0 0:00:06 0.0% imapd/6*
*16677 mailsrv 210M 42M sleep 59 0 0:00:05 0.0% imapd/5*
*16696 mailsrv 205M 36M sleep 59 0 0:00:04 0.0% imapd/5*
*16695 mailsrv 200M 38M sleep 59 0 0:00:04 0.0% imapd/6*
*16685 mailsrv 197M 38M sleep 59 0 0:00:08 0.0% imapd/5*
*16682 mailsrv 195M 40M sleep 59 0 0:00:04 0.0% imapd/5*
*16681 mailsrv 193M 46M sleep 59 0 0:00:04 0.0% imapd/5*
*16690 mailsrv 187M 52M sleep 59 0 0:00:03 0.1% imapd/6*
*16687 mailsrv 187M 40M sleep 59 0 0:00:05 0.0% imapd/5*
*902 icsuser 185M 24M sleep 59 0 0:00:05 0.0% cshttpd/2*
NPROC USERNAME SWAP RSS MEMORY TIME CPU
78 mailsrv 2439M 2329M 28% 0:11:53 0.5%
14 icsuser 1064M 233M 2.8% 0:06:55 0.0%
136 root 965M 727M 8.9% 2:15:20 50%
1 webservd 264M 326M 4.0% 0:16:43 0.3%
1 noaccess 90M 100M 1.2% 0:01:13 0.0%
Total: 237 processes, 1042 lwps, load averages: 1.91, 1.90, 1.89
================================================================================================================
When we run an aplication like OutLook to copy locally to the laptopn all the mail via IMAP, "ONE imapd process" eat more memory that need it and never released.
Example:
================================================================================================================
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
*16673 mailsrv 2856M 2534M sleep 59 0 0:00:06 45% imapd/6* <---------------this process eat memory and slow the system(CPU/RAM)
874 root 610M 421M sleep 59 0 0:14:51 0.1% java/160
818 webservd 413M 285M sleep 59 0 0:16:43 0.3% webservd/95
607 root 326M 45M sleep 59 0 0:07:01 0.1% webservd/58
16719 mailsrv 283M 50M sleep 59 0 0:00:06 0.0% imapd/5
798 root 237M 37M sleep 59 0 0:04:04 0.1% ns-slapd/48
*16677 mailsrv 210M 42M sleep 59 0 0:00:05 0.0% imapd/5*
*16696 mailsrv 205M 36M sleep 59 0 0:00:04 0.0% imapd/5*
*16695 mailsrv 200M 38M sleep 59 0 0:00:04 0.0% imapd/6*
*16685 mailsrv 197M 38M sleep 59 0 0:00:08 0.0% imapd/5*
*16682 mailsrv 195M 40M sleep 59 0 0:00:04 0.0% imapd/5*
*16681 mailsrv 193M 46M sleep 59 0 0:00:04 0.0% imapd/5*
*16690 mailsrv 187M 52M sleep 59 0 0:00:03 0.1% imapd/6*
*16687 mailsrv 187M 40M sleep 59 0 0:00:05 0.0% imapd/5*
*902 icsuser 185M 24M sleep 59 0 0:00:05 0.0% cshttpd/2*
NPROC USERNAME SWAP RSS MEMORY TIME CPU
78 mailsrv 2439M 2329M 80% 0:00:5 0.5%
78 mailsrv 2439M 2329M 10% 0:11:53 0.5%
14 icsuser 1064M 233M 2.8% 0:06:55 0.0%
136 root 965M 727M 8.9% 2:15:20 50%
1 webservd 264M 326M 4.0% 0:16:43 0.3%
Total: 237 processes, 1042 lwps, load averages: 1.91, 1.90, 1.89
===================================================================================================
The rest of the imapd process(29) in this moment just load 40-50MB(when those are free).
If we kill the process 16673 the user connect to the next imapd process and the problem persist whit the same patology: eat memory and CPU, and slow the system.
So, we think that is not normal and maybe we need patch the system to solve the problem.
We will to test the 64Bit version in this moment and we will post the results.
Thank
Jaime