[Dovecot] v2.1 memory usage

[Patrick Domack]

Only have 650 imap clients this weekend, have to give it a try during  
a weekday.

Total(MB) Avg(kB) Name
         2       4 /lib/ld-2.11.1.so
         2       4 /lib/libbz2.so.1.0.4
         2       4 /lib/libc-2.11.1.so
        63      96 /lib/libcrypto.so.0.9.8
         2       4 /lib/libdl-2.11.1.so
         0       0 /lib/libnss_dns-2.11.1.so
         0       0 /lib/libnss_files-2.11.1.so
         2       4 /lib/libpthread-2.11.1.so
         0       0 /lib/libresolv-2.11.1.so
         2       4 /lib/librt-2.11.1.so
        13      20 /lib/libssl.so.0.9.8
         2       4 /lib/libz.so.1.2.3.3
         2       4 /usr/lib/dovecot/imap
        10      16 /usr/lib/dovecot/libdovecot-storage.so.0.0.0
         2       4 /usr/lib/dovecot/libdovecot.so.0.0.0
         2       4 /usr/lib/dovecot/modules/lib10_quota_plugin.so
         2       4 /usr/lib/dovecot/modules/lib11_imap_quota_plugin.so
         2       4 /usr/lib/dovecot/modules/lib20_zlib_plugin.so
         2       4 /usr/lib/dovecot/modules/lib30_imap_zlib_plugin.so
       435     661 [anonymous]
       640     973 [heap]
        55      84 [stack]
      1253   58352 TOTAL


Quoting Timo Sirainen <tss at iki.fi>:

> v2.1's imap/pop3 processes are linked with OpenSSL by default,  
> because of imapc/pop3c storages. I wonder if you notice any actual  
> (system-global) memory usage reduction when compiling without those  
> and you have thousands of imap processes?
>
> ./configure --with-storages=mdbox sdbox maildir mbox cydir
>
> I guess I could try it myself also but maybe someone else wanting to  
> reduce memory usage is quicker? :)
>
> Related to that, you can look at where imap processes' memory goes  
> with: http://dovecot.org/tools/linux-maps-parse-imap.pl
> I don't know how much memory those (writable!) file-backed memory  
> areas actually use per-process. Maybe nothing, maybe something..