NGINX using 100% of the server CPU when testing with Blitz.io

[Robert Paprocki]

Hi,

Can you provide the mailing list with the output of 'nginx -V' and a
debug log when a worker process is pegged at 100%. See
http://nginx.org/en/docs/debugging_log.html for info on debug logs.

I also wonder why your supplied config has the following:

limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s ;
limit_req_status 444 ;

Are you using this anywhere?

On 11/26/2014 11:15 AM, julianfernandes wrote:
> I'm facing an issue here and after six days of looking around I decided to
> ask for some help here, after all a million heads can think a lot better
> than one.
> 
> I have a Ubuntu 14.04 server setup with NGINX, HHVM, PHP5-FPM (as a backup),
> Percona MySQL, Memcached (which will be replaced by Redis). I have
> fastcgi_cache setup for WordPress and object caching done over memcached.
> All cool and dandy in theory, but not in practice.
> 
> This is a RamNode OpenVZ SSD VPS with 2GB of RAM and an Intel Xeon E5 with
> two cores for my VPS. I also tested on a KVM SSD VPS with 2GB of RAM and an
> Intel Xeon E3 with four cores for my VPS.
> 
> Running Blitz.io on it the server is getting absolutely murdered by the
> NGINX worker processes, which each one using 100% CPU according to top and
> htop. I usually run with the following pattern:
> 
>     --pattern 999-1000:60 https://www.geeksune.com/blog/hello-world/
> 
> That makes makes CPU go to the roof and according to Blitz.io this is the
> result of that:
> 
>> 135 HITS WITH 57,734 ERRORS & 234 TIMEOUTS
> 
> Obviously that isn't good. RAM usage stay under 250MB all the time and it
> seems that all those requests from Blitz.io are hitting the cache, as seen
> here:
> 
>> 54.232.204.19 - HIT [23/Nov/2014:19:06:32 -0200] "GET / HTTP/1.1" 200 7632
> "-" "blitz.io; 20bed746e60d4e53401c0c04d245c4eb at 189.101.124.196"
> 
> Notice the HIT at the start. I set a new log format and added
> $upstream_cache_status to it.
> 
> A similar setup on the same machine works just fine with Blitz.io, so there
> is definitely something wrong with my NGINX setup and it seems related to
> fastcgi_cache. I have the same results every time, even with just PHP5-FPM
> with Zend.
> 
> Does anyone have a clue about what is happening? My configuration files look
> like this:
> 
>  - /etc/nginx/nginx.conf - http://paste.ubuntu.com/9236266/
>  - /etc/nginx/sites-available/geeksune.com -
> http://paste.ubuntu.com/9236282/
>  - /etc/nginx/conf.d/includes/ssl.inc - http://paste.ubuntu.com/9236298/
>  - /etc/nginx/conf.d/includes/security.inc -
> http://paste.ubuntu.com/9236321/
>  - /etc/nginx/conf.d/includes/caching.inc -
> http://paste.ubuntu.com/9236353/
>  - /etc/nginx/conf.d/includes/locations.inc -
> http://paste.ubuntu.com/9236366/
> 
> Thanks in advance.
> 
> :)
> 
> Posted at Nginx Forum: http://forum.nginx.org/read.php?2,255158,255158#msg-255158
> 
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