In order to perform realistic tests for a new backend server, I'd like to process all Apache requests twice.
So simply handle all the live requests with the old server, as it's done right now, but then also 'duplicate' the requests to a different virtual host, where the new backend is deployed, which will process the request and log the response.
What's the best / most simple way to achieve this in Apache? (the backend is a FastCGI process)
I want to install debian 4 etch (due to compatibility reasons I can't use debian 5 lenny) but I can't find it.
I looked at the debian archive, but it only lists 1.1 through 3.1, and the getting debian page only lists methods to install debian 5...
I'm sure I'm simply overlooking it but can someone point me to a place where I can find an ISO for debian 4? thanks
The backend of one of our web applications uses MySQL on Linux. It all works very well and fast.
But I also do a lot of my development on OS X, and have the complete live environment mimicked there. It all works correctly, but when several MySQL queries are run concurrently (due to some simultaneous Ajax calls), the MySQL on OS X responds annoyingly slow.
Both on Linux as OS X it's a stock install of MySQL, is anyone aware of a difference in default settings that could cause such a slowdown on OS X?
Edit some extra info, as requested
Is there a good command line utility to monitor hard disk load on linux? Something like top but then monitoring disk activity i.s.o. cpu usage.
More specifically, I suspect that for some (heavy load) servers after several optimizations on various parts of the program(s) that run on it, right now the bottleneck is simply the logging to files on the disk. But I find it very difficult to assess how much traffic the servers can handle.
My ideal tool would be something that prints "You're using 35% of your disk bandwidth right now". Any ideas?