Re: [Cppcms-users] Big cache

[Sergey S. <ser...@gm...>]

Artyom Beilis <artyomtnk@...> writes:


> 
> See, you don't cache objects of 500MB in memory...Caching system is designed 
for pages and other objects of reasonable sizethat their generation is 
costly,Also remember that saving objects to cache and using it from cache 
involves somememcpy... and than serving.if you want to serve huge files/data 
(and 
cache them) it is much better to use file system for this.Put them on disk and 
tell lighttpd, nginx or even apache to serve them, it would do it much 
better.For 
example lighttpd would know to transfer them using sendfile directly from disk 
to 
socketwithout even copying the data to user space.



Thanks for answer. But i need little bit explain. For example we have social 
network (real big social network). We have 3,4,5,6... million users. 
And we have common friends.
Algorithm:

1:
select friend_id from friends where user_id = 1 (10000 rows)
select friend_id from friends where user_id = 2 (6000 rows)

(without join's)

2:
std::set_intersection (return data we need caching)

So i need store friends, common friends, online friends etc...