NCACHE The fast web cache server base on nginx Use aio sendfile and epoll modules The self sort share mem hash index High performance and large storage Low cpu cost and low iowait Record lock instead of process lock Without http headers cache

The fast web cache server base on nginx

Use aio sendfile and epoll modules

The self sort share mem hash index

High performance and large storage

Low cpu cost and low iowait

Record lock instead of process lock

Without http headers cache

OVERVIEW F5 NGINX PROXY NCACHE BACKEND BACKEND BACKEND

STRUCTURE Be proxy hash index Init by Ngx master process when nginx is start on Ngx worker process Ngx worker process Disk Files Read / write by file system or raw dev Backend server Backend server Backend server Body filter Get the proxy content and save into the disk by aio

Logic Diagram Request Request Find cache in index found Not found Timeout? not yes Sendfile output Proxy backend Body filter Writev output Aiowrite fresh index

The self sort share mem hash index 2(5) 3(4) First floor of hash index List to solve the conflict of the hash Hash_malloc 1(6) Index[1]+2 = 7 1(6) 3(4) 2(7) Top:0 16777216 33554432 If arrived at the bottom of the share memory then ncache will return to the 16777216 point and find which can be reused

Record lock Mmap auto sync Mem index Sync file Worker process Worker process Read Write Worker process Do not need to lock any worker process or request cause wait not cause wait not cause wait

Performance between SQUID 1 First: cpu last: io Blue is ncache

Performance between SQUID 2 SQUID NCACHE

Future The aio_sendfile function Compress share memory hash index Memory cache the hottest data Raw device read and write Distribute storage system Aio queue with lio_listio function

The aio_sendfile function

Compress share memory hash index

Memory cache the hottest data

Raw device read and write

Distribute storage system

Aio queue with lio_listio function

The end Google code: http:// code.google.com/p/ncache / Nginx wiki: http://wiki.codemongers.com/ Our mail: [email_address] [email_address]

Google code:

http:// code.google.com/p/ncache /

Nginx wiki:

http://wiki.codemongers.com/

Our mail:

[email_address]

[email_address]