I am going to use shared memory. I found a very good example in the ssl_scache_shmht.c file. This implementation has everything i need of. Now i am just working to remove dependencies that this code has on other mod_ssl files, so to provide a generic shared memory cache table object. I can release the source code to the group if there is some interest in it. If i manage to build a generic solution for the web service caching module i will release this source code also.
Luca On Tue, 08 Mar 2005 16:08:58 +0100, Matthieu Estrade <[EMAIL PROTECTED]> wrote: > luca regini wrote: > > > Taking a look at mod_mem_cache source code i have seen that it doesn't > > use pools to allocate cache objects but i does so by means of > > reference counting and simple calloc/free calls. I have also seen > > that this module requires a Threaded apr to work. > > > If you use prefork, each child is a fork and has it's own memory space, > so you are unable to share data between child -> bad idea > The way you can do is code a cache module using shared memory but in > this case, shm and rmm are not using pools, and i think there will be > performances issues. > > It depend on what you want to do with your cache module. Actually, in a > threaded mpm, each child and the threads inside are sharing common data. > So you have duplicated cache data in each forked child. The performance > depend on how you setup your server. low child number and high thread > number = few request on backend and only few duplicated data. > > Coding a cache module using shared memory is huge work. > Good luck if you choose to do it > > Matthieu > >
