Hi all,
we are trying to migrate our mailservers from cyrus imapd 2.4 to 3.0 and
are currently looking at speed differences in listing mailboxes. Both
the imap command 'list "" ""' for a user and a ctl_mboxlist -d seem to
be quite a bit slower.
At the moment the 3.0 environment has around around 170k mail folders
listed by ctl_mboxlist -d and takes about 0.8s to list all those entries
(piping the output to /dev/null). This system has no real load except
for the list command).
In the 2.4 environment we have 244k mail folders listed and it takes
about 0.5s to list those entries (again piped to /dev/null). This system
is our productive mail server and had some load to handle while listing
was done.
mailboxes.db is in skiplist format on the 2.4 environment. We tried
twoskip and skiplist on the 3.0 environment, but it didn't change that
much.
Using perf record -F 99 -g ctl_mboxlist -d > /dev/null and then perf
report I get for 3.0
+ 41.67% 0.00% ctl_mboxlist libcyrus.so.0.0.0 [.]
cyrusdb_foreach
+ 41.67% 0.00% ctl_mboxlist libcyrus_imap.so.0.0.0 [.]
mboxlist_allmbox
+ 41.67% 0.00% ctl_mboxlist ctl_mboxlist [.] do_dump
+ 34.52% 0.00% ctl_mboxlist [kernel.kallsyms] [k]
entry_SYSCALL_64_fastpath
+ 22.62% 5.95% ctl_mboxlist libc-2.22.so [.] do_fcntl
+ 22.62% 2.38% ctl_mboxlist libc-2.22.so [.]
__xstat64
...
and for 2.4 I get
+ 11.63% ctl_mboxlist [kernel.kallsyms] [k] kmem_cache_alloc
+ 9.30% ctl_mboxlist [kernel.kallsyms] [k]
system_call_after_swapgs
+ 6.98% ctl_mboxlist [kernel.kallsyms] [k] kmem_cache_free
+ 6.98% ctl_mboxlist [kernel.kallsyms] [k] fcntl_setlk
+ 4.65% ctl_mboxlist [kernel.kallsyms] [k] fget_raw
+ 4.65% ctl_mboxlist [kernel.kallsyms] [k] locks_copy_lock
+ 4.65% ctl_mboxlist [kernel.kallsyms] [k] _raw_spin_lock
+ 2.33% ctl_mboxlist libc-2.11.3.so [.]
__GI_____strtoll_l_internal
+ 2.33% ctl_mboxlist libc-2.11.3.so [.] __free
...
Has anyone an idea, why cyrusdb_foreach and mboxlist_allmbox is so
promiment in the 3.0 recording or rather why 3.0 appears to be so much
slower compared to 2.4?
Felix
----
Cyrus Home Page: http://www.cyrusimap.org/
List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/
To Unsubscribe:
https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus
