Hi list,
I have the following setup - Ubuntu 6.06, postfix + courier + squirrelmail and
mailboxes on a nfs share. I have two such nodes with a load balancer in
front.
The problem that I`m hitting sometimes it that the imapd daemon takes too much
time to scan a mailbox, even if it is empty.
I strace-d the imapd daemon few times and here is what I found:
[pid 3628] 05:12:49.870364 close(3) = 0
[pid 3628] 05:12:49.870453 socket(PF_FILE, SOCK_STREAM, 0) = 3
[pid 3628] 05:12:49.870536 connect(3, {sa_family=AF_FILE,
path=@/tmp/fam-vmail-}, 110) = -1 ECONNREFUSED (Connection refused)
[pid 3628] 05:12:49.870643 close(3) = 0
[pid 3628] 05:12:49.870717 access("/usr/lib/gamin/gam_server", R_OK|X_OK) = 0
[pid 3628] 05:12:49.870807 fork(Process 3630 attached
) = 3630
[pid 3628] 05:12:49.871450 waitpid(3630, Process 3628 suspended
<unfinished ...>
[pid 3630] 05:12:49.871571 getpid() = 3630
[pid 3630] 05:12:49.871643 getrlimit(RLIMIT_STACK, {rlim_cur=2044*1024,
rlim_max=RLIM_INFINITY}) = 0
[pid 3630] 05:12:49.871722 setrlimit(RLIMIT_STACK, {rlim_cur=RLIM_INFINITY,
rlim_max=RLIM_INFINITY}) = 0
[pid 3630] 05:12:49.871977 getrlimit(RLIMIT_NOFILE, {rlim_cur=1024,
rlim_max=1024}) = 0
[pid 3630] 05:12:49.872048 fcntl64(0, F_SETFD, FD_CLOEXEC) = 0
[pid 3630] 05:12:49.872110 fcntl64(1, F_SETFD, FD_CLOEXEC) = 0
[pid 3630] 05:12:49.872167 fcntl64(2, F_SETFD, FD_CLOEXEC) = 0
[pid 3630] 05:12:49.872224 fcntl64(3, F_SETFD, FD_CLOEXEC) = -1 EBADF (Bad
file descriptor)
[pid 3630] 05:12:49.872285 fcntl64(4, F_SETFD, FD_CLOEXEC) = -1 EBADF (Bad
file descriptor)
[pid 3630] 05:12:49.872344 fcntl64(5, F_SETFD, FD_CLOEXEC) = -1 EBADF (Bad
file descriptor)
[pid 3630] 05:12:49.872403 fcntl64(6, F_SETFD, FD_CLOEXEC) = -1 EBADF (Bad
file descriptor)
This goes on for few seconds (2-3) and then a gam_server process is forked and
I get my reply from the server only when the gam_server exits which is 30
sec. That is when I access the mailbox via squirrelmail and I end up waiting
30+ sec to open a mailbox with 5 mails.
So question 1:
1) is there a way to optimize gam_server - is it better to run it
with --notimeout on boot, does it make sense to use it at all with nfs
shares? If yes - how to configure it so it monitors only the mailboxes, not
the whole nfs share or /. If I dont need it for nfs - how to disable it
(possible without rebuilding courier)?
The strange thing is that when I stop one of the nodes. I see that
squirrelmail uses frames and makes a login for each frame, so a common
scenario is that one frame hist the flirts server and the other hits the
other server, and in this case each of the nodes makes a 30 sec pause when
stracing imapd (which makes me think it may have something to do with gamin).
Is there any lock that would prevent two processes accessing the same mailbox
over nfs?
And question 2:
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