What is bzip2 and why is it such a system hog?
I understand it to be a compression utility but what is it compressing?
I saw the temp on my CPU going up and up and up, checked the Activity Monitor and showed
bzip2 as the hog
It shot my CPU temp up to 60C... It happened right around midnight so I suspect it might be compressing log files. Seems a little intense though... Nothing in the console files though that suggest it was even running....
Thanks for any insights...
Message was edited by: A. Timleck
bzip2 is a data compression tool, like PKZIP, WinZip, gzip, etc. Specifically, it reads in a bunch of data, looks for repetitious patterns of bits, and builds a table of abbreviations for those patterns of bits. By storing the table, and the bits of the file replaced by abbreviations, it effectively makes the data smaller, while containing the same information (though, to get at it, you have to use the table to convert the abbreviations back into the bits they represent). This is called "lossless data compression".
What is it doing on your Mac? Well, any program could be using it for something, but on a basic installation of Leopard with no other software, it's used by a service that performs what's called "log rotation". Your machine keeps informational messages about various events that happen on your computer, "logs". Depending what's going on, these can get long, and you generally don't want them filling up your hard disk, but they are still useful from time to time to see what's going on. So, the system moves the log file and compresses it (using gzip or bzip2). That way you still have a few days of copies of the logs (it generally throws out a compressed log after a week), but they don't take up nearly as much space. You can read the logs with the Console.app utility.
I wouldn't worry so much about bzip2 - It should finish quickly, unless the file it's compressing is absolutely huge. If the file (presumably a log file) is very big, it means that something's going on that's causing the logs to fill up with messages. That's very probably something you want to look at, so use Console.app to see if there's a bunch of messages in any of the log files that indicate that something's awry (they can be fairly cryptic).
The Console.app log won't specifically mention anything about bzip2 running if the running of bzip2 is a normal activity (which it is).
One thing you might also want to do, is use the hierarchy view in Activity Monitor.app to see what started it (the parent). I haven't looked into the scheme the Mac uses for log rotation, but there'd be a script for it under CoreServices or something (on Linux, it'd be logrotate). If it is, instead, some application or service that you installed, you can check with the source of that service to see if you can't do something to alter the behavior.
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