Ben Carter
2018-05-09 12:27:33 UTC
For starters:
strace one of the processes & see if it's making any system calls at all.
pstack a process multiple times to get PC samples.
gcore a process to get a core dump & take a look at the core dump with gdb.
If you know that a specific account is likely to have this issue, enable
IMAP protocol logging for the account. This may tell you something.
Ben
Ben Carter
University of Pittsburgh/CSSD
Network Operations Center
***@pitt.edu
412-624-6470
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strace one of the processes & see if it's making any system calls at all.
pstack a process multiple times to get PC samples.
gcore a process to get a core dump & take a look at the core dump with gdb.
If you know that a specific account is likely to have this issue, enable
IMAP protocol logging for the account. This may tell you something.
Ben
Hello,
We've recently upgrade to cyrus 3.0.6 and we've been experiencing issue
where imapd will get stuck in an Append and take 100% CPU time. The
client doesn't see anything weird. I've tried leaving the processes to
see if they resolve, but they never did. Doing a kill -TERM twice will
kill the process. I did not notice any issues with cyrus 3.0.5, but
we've been trying to get Xapian indexing going, so we moved to 3.0.6.
Does anyone have any information on where I can look to rectify this issue?
87556 cyrus 1 102 0 163M 24192K CPU7 7 1:56 96.71% imapd: imap: <client
hostname> [<clientip>] <username> user.<username>.<folder1> Append (imapd)
89680 cyrus 1 102 0 163M 24280K CPU4 4 3:10 96.22% imapd: imap: <client
hostname> [<clientip>] <username> user.<username>.<folder2> Append (imapd)
43932 cyrus 1 102 0 161M 23416K CPU5 5 1:41 96.17% imapd: imap: <client
hostname> [<clientip>] <username> user.<username>.<folder3> Append (imapd)
81590 cyrus 1 102 0 163M 24976K CPU6 6 3:14 94.76% imapd: imap: <client
hostname> [<clientip>] <username> user.<username>.<folder4> Append (imapd)
--We've recently upgrade to cyrus 3.0.6 and we've been experiencing issue
where imapd will get stuck in an Append and take 100% CPU time. The
client doesn't see anything weird. I've tried leaving the processes to
see if they resolve, but they never did. Doing a kill -TERM twice will
kill the process. I did not notice any issues with cyrus 3.0.5, but
we've been trying to get Xapian indexing going, so we moved to 3.0.6.
Does anyone have any information on where I can look to rectify this issue?
87556 cyrus 1 102 0 163M 24192K CPU7 7 1:56 96.71% imapd: imap: <client
hostname> [<clientip>] <username> user.<username>.<folder1> Append (imapd)
89680 cyrus 1 102 0 163M 24280K CPU4 4 3:10 96.22% imapd: imap: <client
hostname> [<clientip>] <username> user.<username>.<folder2> Append (imapd)
43932 cyrus 1 102 0 161M 23416K CPU5 5 1:41 96.17% imapd: imap: <client
hostname> [<clientip>] <username> user.<username>.<folder3> Append (imapd)
81590 cyrus 1 102 0 163M 24976K CPU6 6 3:14 94.76% imapd: imap: <client
hostname> [<clientip>] <username> user.<username>.<folder4> Append (imapd)
Ben Carter
University of Pittsburgh/CSSD
Network Operations Center
***@pitt.edu
412-624-6470
----
Cyrus Home Page: http://www.cyrusimap.org/
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