[Dovecot] dovecot/lmtp munmap()-ing a lot

[Ralf Hildebrandt]

I observed several long running dovecot/lmtp processes hogging the
CPU. I then strace'd them (strace -c -p 6375) and found them
munmap()-ing a lot:

% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 97.18   19.592537        1878     10430           munmap
  2.28    0.458984          36     12696           epoll_ctl
  0.26    0.052926          10      5288           fdatasync
  0.21    0.042472           3     13679           epoll_wait
... snip ...  

Why would that happen? (dovecot 2.1.17)
    
-- 
[*] sys4 AG

http://sys4.de, +49 (89) 30 90 46 64
Franziskanerstraße 15, 81669 München

Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263
Vorstand: Patrick Ben Koetter, Marc Schiffbauer
Aufsichtsratsvorsitzender: Florian Kirstein