Hi,
I'm seeing sporadic 'slow' or hanging mailq commands on my Postfix
2.9.6-1~12.04.1 (Ubuntu 12.04.1, 64bit) install. Typing 'mailq' either
hangs quite some time then gives the mailqueue output, or it blocks and
quits stating no mails are queued.
Relevant strace output:
| 14:15:03 connect(4, {sa_family=AF_FILE, path="public/showq"}, 110) = 0
<0.000016>
| 14:15:03 gettimeofday({1395839703, 908995}, NULL) = 0 <0.000004>
| 14:15:03 poll([{fd=4, events=POLLIN}], 1, 3600000) = 1 ([{fd=4,
revents=POLLIN}]) <52.493691>
| 14:15:56 read(4, "-Queue ID- --Size-- ----Arrival "..., 4096) = 193 <0.000013>
| 14:15:56 gettimeofday({1395839756, 402854}, NULL) = 0 <0.000005>
On this system, mailq is called quite often to keep track of the queue.
Since the mailq calls are done asynchronous two calls might come in
within the same second. I had a few 'showq -t unix -u -c' procs running,
killed them, and now it's fast again. Next time i'll try and see if they
give any usefull strace output.
Sounds familiar to anyone?
-Sndr.
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