Brian Akins wrote:
Jean-Jacques Clar wrote:
Would you please share with us some info on that optimized caching module.
I'll say what I can. I'm hoping I can GPL it.
Is mod_url_cache a modified copy of the current ones?
No. It borrows some ideas from various other modules, including mod_cache and mod_file_cache.
Why are the current ones not fulfilling your needs?
In our situation, we know alot about the data that is being cached, so we can be more aggressive with caching. mod_cache cannot cache url that end in /, so it would not help us. Also, mod_cache (either disk or mem) were too slow for us. mod_url_cache (I couldn't come up with a better name) can fill up two Gigabit interfaces on our Opterons and still have ~25% CPU idle time.
I'd certainly be interested in knowing how much faster mod_url_cache is as compared to mod_cache/mod_mem_cache. The only way I can see to -dramatically- improve the performance of mod_cache/mod_mem_cache is to completely bypass i/o filters. I have some patches to mod_mem_cache laying around that give perhaps a 10% performance improvement by prebuilding headers and aligning them on cache boundaries, but 10% is not really that great.
Bill
