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Hi all,
It is with great pleasure that I'm announcing the availability of DBMail version
2.3.3, the latest in the 'unstable' development series.
This release is the most invasive rewrite since 2.0.0 was released. The number
of changes was quite dramatic. Because of this, and the fact that this is still
the 'unstable' development series, you should not use this server in production
environments. Please use 2.2.10 there until 2.4.0 is released.
Some of the highlights:
* libevent: the preforking code was removed and DBMail's server code was
rewritten around the libevent library. This means each DBMail server will only
run as a single process and will automatically use the best kernel facilities
available to provide multiplexed connection handling.
* libzdb: the native drivers for MySQL, PostgreSQL and SQLite3 have been
replaced by an external library that provides full support for prepared
statements and a shared database connection pool.
* threads: the IMAP server uses a worker threadpool to deal with high
concurrencies without blocking on database calls. Combined with the shared
database connection pool this means you can run hundreds of clients against a
single DBMail process while only using a very small number of database
connections. While the POP3 server will be made threaded over the next releases,
the LMTP and MANAGESIEVE servers will probably remain single-threaded. Neither
requires high concurrencies generally and the event-driven server core already
provides excellent performance and throughput under low concurrencies.
Some caveats:
There is a bug in Thunderbirds IDLE code that makes TB behave erratic. You
should disable IDLE in dbmail.conf by tweaking the CAPABILITY setting, or
disable IDLE in TB itself by editing the account settings below 'servers...',
'advanced'. I will work around this in the next DBMail release.
Changelog
http://git.dbmail.eu/?p=paul/dbmail;a=shortlog;h=v2.3.3
Download
http://www.dbmail.org/download/2.3/dbmail-2.3.3.tar.gz
- --
________________________________________________________________
Paul Stevens paul at nfg.nl
NET FACILITIES GROUP GPG/PGP: 1024D/11F8CD31
The Netherlands________________________________http://www.nfg.nl
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