Varnish – nowoczesny akcelerator HTTP dla dostawców treści.pdf

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A modern HTTP accelerator
for content providers
Leszek Urbański
Trader Media East Competence Center
PLNOG 4 – Warsaw, 2010-03-05
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Varnish
● a state-of-the-art reverse proxy and cache
●
open source, initially developed for a
Norwegian tabloid “Verdens Gang” in 2006
●
Poul-Henning Kamp – architect and lead
developer
●
Linpro AS
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Varnish
● used by TOP100 sites
●
Twitter
● Photobucket
●
weather.com
●
answers.com
●
Hulu
● Wikia
●
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Architecture
● Varnish does not fight the OS kernel!
●
uses virtual memory, two main stevedores:
● mmap()
●
malloc()
●
scales well in SMP environments
● event-based acceptor
●
multi-threaded worker model
●
static workspaces – reused, operating on
pointers
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Architecture
● SHM logging
●
an mmap()ed file shared by all threads and logging
programs
● logging without syscalls!
memcpy(p + SHMLOG_DATA, t.b, l);
/* or */
vsnprintf((char *)(p + SHMLOG_DATA), mlen + 1, fmt, ap);
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