2 messages in ru.sysoev.nginxRe: Nginx cache is slow| From | Sent On | Attachments |
|---|---|---|
| ddarko | Aug 19, 2011 12:57 am | |
| Maxim Dounin | Aug 19, 2011 1:32 am |
| Subject: | Re: Nginx cache is slow | |
|---|---|---|
| From: | Maxim Dounin (mdou...@mdounin.ru) | |
| Date: | Aug 19, 2011 1:32:55 am | |
| List: | ru.sysoev.nginx | |
Hello!
On Fri, Aug 19, 2011 at 03:58:09AM -0400, ddarko wrote:
Nginx 1.1.0
location / { uwsgi_cache tna; uwsgi_cache_use_stale error timeout http_500; uwsgi_cache_valid any 10m; uwsgi_cache_key $request_uri;
include /etc/nginx/params_uwsgi; uwsgi_intercept_errors off; uwsgi_pass unix:/tmp/uwsgi-tna.sock; }
I made a simple test: $ ab -c 10 -n 10000 http://.... on localhost. I am sure that the request is sent to uWSGI only once and is then cached. result: Requests per second: 3712.93 [#/sec] (mean)
Meanwhile, on the same machine and the same nginx for static file reaches the result: Requests per second: 4826.62 [#/sec] (mean)
How is that static files are faster to 30%! from the cache based on static files ?
Cached response require additional reading of original response headers, as well as calculating cache key and parsing the headers in question (which may be an issue on cpu-bound servers). So I would expect it to be somewhat slower than plain static files.
While 30% looks a bit too many, it certainly depens havily on response sizes involved as well as type of a limiting factor (i.e. cpu or disk bound). In worst case I would expect cache to be 2x slower compared to static files (though it's unlikely to happen in real life).
Maxim Dounin
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