Many people have reported this issue over the last few years. I joined the list of people complaining about this problem in the Roundcube Trac in an effort to solve the issue.

The server was a fairly standard setup: Ubuntu 8.04 LTS, Apache2, PHP5 (mod_php), Roundcube 0.3 and Imapproxy. In order to try to fix the load problem, the server was upgraded to Ubuntu 10.04 LTS and php-apc was installed. This resulted in crippling load on the server and very slow page load times.

Further investigation and a good hunch revealed that MySQL needed tuning. Up until this point, MySQL had been running with the default tuning options. As Roundcube stores all its data using InnoDB, the InnoDB settings had to be tuned. Changing the following options caused the webmail to instantly perform well again.

innodb_buffer_pool_size = 64M
innodb_additional_mem_pool_size = 20M

php-apc was doing a great job and the cache hits for it were almost 100%. The issue with Apache children hanging around still persisted however. I began to think that the cause might be bottlenecks that were being thrown in Roundcube’s way.

I suspected that imapproxy may be one bottleneck in the system. Netstat revealed that there were 200 IMAP connections open by imapproxy. Once it was disabled, this fell to a handful. The Roundcube interface became very responsive and the load issue on the server went away. Now there are no Apache children that get stuck in the CLOSE_WAIT state.

If you’re having similar problems, try the above solutions that worked for me. If they don’t work, I’d suggest looking for other bottlenecks on your system as Roundcube seems to be quite sensitive to them.

Polyphony

• Choral Wiki

Organ/Hymnody

• English hymns in the commons
• Music for Liturgy

Propers

• MP3′s and notation of chanted Latin propers of the Extraordinary Form
• MP3′s and notation of chanted Latin propers of the Ordinary Form
• Notation of chanted Latin propers of the Extraordinary Form
• Notation of chanted English propers of the Ordinary Form
• Simple Choral Gradual – Antiphonal
• Chanted propers adapted to English
• Liber Usualis

Ordinaries

• MP3 recordings of ordinaries including notation

Psalmody

• Plain modal English psalms
• Chabanel responsorial psalm project

shadowLastChange – number of days since January 1, 1970 that the password was last changed.
shadowMin – number of days before the password can be changed (typically 0).
shadowMax – number of days before the password must be changed (typically 99999).
shadowWarning – number of days to warn user of an expiring password (typically 7).
shadowInactive – number of days after password expires that account is disabled.
shadowExpire – number of days since January 1, 1970 that the account was disabled.
shadowFlag – reserved.

clock set 13:08:30 30 March 2008

Then tell IOS what the New Zealand offset is and when daylight savings comes in:

clock timezone NZST 12
clock summer-time NZDT recurring last Sun Sep 2:00 1 Sun Apr 3:00

The official Cisco documentation is here.

Today I purchased a Cisco 2950 switch and needed a console cable (RJ45 to DB9) so that I could set the switch up. Rather than pay through the nose for a pre-made cable, I realised that I could make my own one from an old serial cable. You just need a spare RJ45 plug and a crimper.

GeoDjango is a geographic framework for Django that is now included as part of the Django distribution. It looks fairly good and I’ll be using it on some upcoming projects. There are some presentations here if you want to get an idea of how it works.

Google Maps has its own SRID: 900913. 1337-speak for Google. If you want to use it with PostGIS, you’ll have to add the definition to the spatial_ref_sys table.

I can highly recommend these Dynalink products. So far I haven’t had any problems and I’m surprised at the quality of the firmware – far better than products from much bigger companies (ie Linksys, D-Link, etc). I can also highly recommend the Tomato firmware for the Linksys WRT54G wireless router. I used to run DD-WRT and was reluctant to move to Tomato because DD-WRT was quite good. After having moved though, I’m wishing that I had done it earlier. Tomato does everything that I need and it does it well.

One particular feature that I can’t live without is the bandwidth graphs in Tomato. There is also a feature to save the data usage logs to an SMB share so that if you have to restart your router, historical usage data can still be shown. Another feature that I’m quite happy about is the ability to force clients to use only WPA2 + AES to connect to the router. I ultimately want my network to be as secure as possible and forcing clients to use WPA2 + AES is a good way of doing that.