Nginx performance data

[Paul]

On 2022-01-10 12:47 p.m., James Read wrote:

> I've been doing some preliminary experiments with PACKET_MMAP style 
> communication. 

With apologies for "snipping", and disclaimer that I am not an nginx 
developer, only a long term user.

So, MMAP has given you "preliminary" analysis of what your kernel can do 
with your hardware. Would you care to share, in a meaningful manner, any 
results that you feel are relevant to any tcp processes - perhaps nginx 
in particular?

> I'm able to max out the available bandwidth using this 
> technique. 

Available bandwidth? Please define. Is this local, or WAN? Are you on a 
56k dial-up modem? or do you have multiple fail-over, load-balanced 
fibre connectivity?  MMAP to the best of my knowledge, never claimed to 
be able to simulate live (live in the sense 'externally processed IP') 
tcp/http connections, so what "recognized benchmark" did you max out?

Could Nginx be improved in a similar way?

"improved"? From what and to what? Starting point? End-point? Similar to 
what "way"?

You write (below) "a large number of small pages to a large number of 
clients..." Large number? 10 to what exponential?  I've just looked at 
an nginx server that has dealt with ~88.3 GB/sec over the last few 
minutes, and cpu usage across 32 cores is bumbling along at less that 
3%, temperatures barely 3 degrees above ambient, memcached transferring 
nothing to swap.

Either you have badly explained what you are looking for, or, heaven 
forfend, you're trolling.

Paul.
Tired old sys-admin.

> James Read
> 
> 
> 
>     Regards
>     Alex
> 
>      > On Fri, Jan 7, 2022 at 6:33 PM James Read
>     <jamesread5737 at gmail.com <mailto:jamesread5737 at gmail.com>> wrote:
>      >
>      >
>      >
>      >     On Fri, Jan 7, 2022 at 11:56 AM Anoop Alias
>     <anoopalias01 at gmail.com <mailto:anoopalias01 at gmail.com>> wrote:
>      >
>      >         This basically depends on your hardware and network speed etc
>      >
>      >         Nginx is event-driven and does not fork a
>     separate process for handling new connections which basically makes
>     it different from Apache httpd
>      >
>      >
>      >     Just to be clear Nginx is entirely single threaded?
>      >
>      >     James Read
>      >
>      >
>      >         On Wed, Jan 5, 2022 at 5:48 AM James Read
>     <jamesread5737 at gmail.com <mailto:jamesread5737 at gmail.com>> wrote:
>      >
>      >             Hi,
>      >
>      >             I have some questions about Nginx performance. How
>     many concurrent connections can Nginx handle? What throughput can
>     Nginx achieve when serving a large number of small pages to a large
>     number of clients (the maximum number supported)? How does Nginx
>     achieve its performance? Is the epoll event loop all done in a
>     single thread or are multiple threads used to split the work of
>     serving so many different clients?
>      >
>      >             thanks in advance
>      >             James Read
> 
> 
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