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...e test environment to determine what would be best settings. I have been told that enabling zlib compression would be good to save iops on storage. But doing the test now, I get worse results. [@test2 ~]# pr -m -t mail04-mdbox-vdb-append-64kb-6.log mail04-mdbox-vdb-append-64kb-8.log |less Logi Sele Appe Logi Sele Appe 100% 100% 100% 100% 100% 100% 1 1 6 1/ 1 1 1 6 1/ 1 0 0 9 1/ 1 0 0 8 1/ 1 0 0 7 1/ 1 0 0 8 1/ 1 0 0 10 1/ 1...

...e what would be best settings. I have > been told that enabling zlib compression would be good to save iops on > storage. But doing the test now, I get worse results. > > [@test2 ~]# pr -m -t mail04-mdbox-vdb-append-64kb-6.log > mail04-mdbox-vdb-append-64kb-8.log |less > Logi Sele Appe Logi Sele Appe > 100% 100% 100% 100% 100% 100% > 1 1 6 1/ 1 1 1 6 1/ 1 > 0 0 9 1/ 1 0 0 8 1/ 1 > 0 0 7 1/ 1 0 0 8 1/ 1 > 0...

...ount=10, mail_drop_priv_before_exec=yes, passdb+userdb = passwd-file Cyrus: Default Debian settings, except sasl_pwcheck_method: alwaystrue Courier: Default Debian settings, using PAM + passwd Results: imaptest parameters: clients=1 msgs=30 secs=120 seed=1 mmap_disable:no fsync_disable:no Logi Sele Fetc Fet2 Stor Dele Expu Appe Disc 1135 1135 1134 1134 577 298 298 378 1134 1125 1125 1124 1124 573 295 295 373 1124 1123 1123 1122 1122 572 294 294 371 1122 mmap_disable:yes fsync_disable:no Logi Sele Fetc Fet2 Stor Dele Expu Appe Disc 1401 1401 1400 1400 710 388 388 480 1400 13...

...look at them too closely. STORE command also seemed to be buggy, giving lots of "STORE failed" errors, even with just one connection. Zimbra uses 500MB of memory just to start up, so it's not exactly for hosting small installations. Login+Logout ------------ Dovecot: ./imaptest - select=0 secs=10 seed=0 clients=1 Logi Logo 100% 100% 3439 6878 ./imaptest - select=0 secs=10 seed=0 clients=10 Logi Logo 100% 100% 4415 8830 Zimbra: ./imaptest - select=0 secs=10 seed=0 clients=1 Logi Logo 100% 100% 18032 36064 ./imaptest - select=0 secs=10 seed=0 clients=10 Logi Logo 100%...

...ad that increasing it from 2MB, could give problems when deleting messages, can someone explain this? Does anyone have this on a cephfs mount, does it make sense to set this to 4MB? [@test2 ~]# pr -m -t mail04-mdbox-vdb-append-64kb-4MB-6.log mail04-mdbox-vdb-append-64kb-16MB-7.log |less Logi Sele Appe Logi Sele Appe 100% 100% 100% 100% 100% 100% 1 1 6 1/ 1 1 1 8 1/ 1 0 0 9 1/ 1 0 0 9 1/ 1 0 0 7 1/ 1 0 0 7 1/ 1 0 0 10 1/ 1...

...lly be. Skip to bottom for the conclusions. Originally I ran the tests with the databases being in XFS filesystem. MySQL's performance was horrible. It went 3-7x faster with ext3. MySQL 5.0.30 backend (innodb): ./imaptest clients=1 - append=100 seed=1 secs=30 msgs=1000000 logout=0 Logi Sele Appe 100% 100% 100% 5% 1 291 303 So that's 10 messages/sec saved. Now how about with 5 concurrent clients? Logi Sele Appe 100% 100% 100% 5% 5 1259 1332 Pretty well. Then something more generic: ./imaptest clients=1 seed=1 secs=30 msgs=1000000 logout=0 L...

...CPU cores can be used then. Hmm. I guess if there were no locking it should have reached 3400 msgs/sec, but it's better than no performance increase. And the raw data: multi-dbox, fsync_disable=yes imaptest clients=1 secs=1;imaptest clients=1 msgs=1000000 - logout=0 append=100,0 secs=60 Logi Sele Appe 100% 100% 100% 1 1 1759 1/ 1 0 0 1424 1/ 1 0 0 1734 1/ 1 ... 0 0 1701 1/ 1 0 0 1640 1/ 1 0 0 778 1/ 1 0 0 1305 1/ 1 0 0 1598 1/ 1 Totals: Logi Sele Appe 100% 100% 100% 1 1 90842 multi-dbox, fsync_disable=no...

...only wants to use it. BTW. Does anyone have better naming ideas than "uiddir"? I'll commit it to CVS HEAD once I'm sure about the name. :) u: Dovecot CVS HEAD + uiddir m: Dovecot CVS HEAD + Maildir c: Cyrus IMAP 2.2.13 ./imaptest list=0 seed=1 secs=60 clients=10 Logi Stat Sele Fetc Fet2 Stor Dele Expu Appe Logo u: 23486 11822 23481 23476 33426 11659 8038 23472 11922 46952 m: 19367 9734 19367 19356 27453 9687 6287 19347 7983 38709 c: 5124 2553 5121 5105 7080 2559 1877 5104 3271 10228 ./imaptest list=0 dele=20 expu=20 seed=1 secs=60 msgs=10000 clients...

...the user mailbox persistent in a node, we will thank's any help from you. we are interested in using GFS2 or NFS, we believe the problem is the locks, how can we improve this?? best regards, Aliet The results rhel 4.8 x86_64/GFS1 two nodes, shared FC lun on a SAN Totals: Logi List Stat Sele Fetc Fet2 Stor Dele Expu Appe Logo 100% 50% 50% 100% 100% 100% 50% 100% 100% 100% 100% 30% 5% 1- 2608 1321 1311 2608 2508 3545 547 2001 2493 2702 5282 2- 2810 1440 1430 2810 2688 3835 403 2154 2679 2925 5706 3- 2913 1457 1441 2908 2778 3913 417...

...think that's mostly because of the APPEND optimization. Here are the results: 100MB ext3 filesystem inside a file in XFS. C: CVS HEAD, fsync_disable=yes, mmap_disable=yes S: CVS branch_1_0 (upcoming 1.0.rc28), fsync_disable=yes, mmap_disable=yes ./imaptest seed=1 secs=60 Logi List Stat Sele Fetc Fet2 Stor Dele Expu Appe Logo C: 11275 5647 5597 11275 11264 16179 5571 4126 11256 6074 22531 C: 11287 5740 5606 11287 11275 16193 5698 4154 11267 6064 22553 S: 9201 4660 4575 9197 9190 13107 4614 2843 9184 3601 18382 S: 9271 4701 4657 9267 9260 13189 4580 2799 9256 3540 18522...

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...5? 200??? 0? 435? 642? 215? 226? 439? 445? 50/ 50 ?? 0? 229? 194??? 0? 441? 637? 223? 213? 441? 436? 50/ 50 ?? 0? 213? 219??? 0? 434? 616? 212? 232? 431? 428? 50/ 50 ?? 0? 210? 213??? 0? 427? 622? 203? 219? 434? 440? 50/ 50 ?? 0? 112? 113??? 0?? 35?? 30?? 30?? 56?? 87? 111 ms/cmd avg Logi List Stat Sele Fetc Fet2 Stor Dele Expu Appe 100%? 50%? 50% 100% 100% 100%? 50% 100% 100% 100% ????????????????????????? 30%??????????????????? ? ?? 0? 231? 246??? 0? 443? 622? 204? 211? 444? 440? 50/ 50 ?? 0? 215? 211??? 0? 431? 601? 194? 219? 428? 430? 50/ 50 ?? 0? 230? 228??? 0? 445? 626? 216? 235? 445? 440?...

...retty great, it seems to be twice as fast as v1.0. v1.0: Maildir, dovecot-1.0 hg + inotify dotlock wait patch, mmap_disable=yes v1.1: Maildir, dovecot hg, mmap_disable=no cydir: Cydir, dovecot hg, mmap_disable=no 1 client -------- ./imaptest logout=0 seed=1 secs=10 clients=1 Logi List Stat Sele Fetc Fet2 Stor Dele Expu Appe 100% 50% 50% 100% 100% 100% 50% 100% 100% 100% 30% 5% v1.0: 1 1221 1179 1 2420 3458 323 1934 2419 2552 v1.1: 1 2606 2597 1 5221 7352 688 4181 5221 5489 cydir: 1 4495 4534 1 8960 12786 1216 7224 8...

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...474 What I would like to get is: Coefficients: (Intercept) fd2 fd3 fd2:y fd3:y Is there an easy way to achieve this? Maybe it's obvious how to do it, but I'm new to R did quite some searching without finding the solution. Thanks a lot in advance! Andreas Goesele -- Andreas G?sele

...---------- imap {} (10-master.conf). service imap { [...] process_limit = 8192 [...] } auth {} service auth { [...] client_limit = 9516 [...] } process_min_avail = 16 ---%<------------------------------------------ mail_max_userip_connections = 100 The test results shows : Logi List Stat Sele Fetc Fet2 Stor Dele Expu Appe Logo 100% 50% 50% 100% 100% 100% 50% 100% 100% 100% 100% 30% 5% 324 142 128 263 299 405 92 153 320 336 335 800/800 212 92 92 182 166 233 59 87 178 201 202 800/800 - 4051 stalled for 16 secs in co...

...that I'm excessively heavy handed, but when I let imaptest10 rip with the command... ./imaptest10 user=test%03d host=testserver.imap.york.ac.uk clients=50 mbox=./dovecot.mbox msgs=1000 secs=30 logout=10 ...after 15 seconds or so I started getting output along the lines of: Logi List Stat Sele Fetc Fet2 Stor Dele Expu Appe Logo 100% 50% 50% 100% 100% 100% 50% 100% 100% 100% 10% 30% 5% 2 0 1 1 1 0 0 0 0 0 0 50/ 50 2 0 0 1 1 0 0 0 0 0 0 50/ 50 0 0 2 2 0 1...

...ew cluster and apparently no combination of parameters works, because fetch instruction doesn't run. Below is the command I'm using and its partial output imaptest/src/imaptest host=$SERVER_IP port=143 user=teste%d at example%d.com pass=$TEST_PASS users=10 domains=10 clients=100 - append=0 select=100 fetch=100 Logi Sele Fetc Logo 100% 100% 100% 100% 166 156 0 156 99/100 223 230 0 230 100/100 206 203 0 203 97/100 Can anybody help me understand why fetch doesn't work and how to fix this? Regards, -- Jo?o Paulo Bastos DevOps Engineer at Mav Tecnologia Belo Horizon...

http://dovecot.org/patches/1.1/maildir-dirty-syncs.diff This patch adds a new maildir_very_dirty_syncs setting. If set to "yes", Dovecot assumes it's the only one changing the cur/ directory (so other MDAs can add mails to new/ without problems). This makes it possible to avoid rescanning the cur/ directory all the time looking for filenames. It also looks like (in stress testing)

dovecot-1.1.beta16]# gcc imaptest.c -o imaptest -g -Wall -W -I. -Isrc/lib-mail -Isrc/lib -Isrc/lib-imap -Isrc/lib-storage/index/mbox -DHAVE_CONFIG_H src/lib-storage/index/mbox/mbox-from.o src/lib-imap/libimap.a src/lib-mail/libmail.a src/lib/liblib.a imaptest.c: In client_append function: imaptest.c:1492: error: too many arguments for i_stream_create_limit function