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- Subject: Re: CGILua
- From: "Jim Whitehead II" <jnwhiteh@...>
- Date: Sat, 17 May 2008 08:36:22 +0100
On Sat, May 17, 2008 at 3:05 AM, Pete Kay <petedao@gmail.com> wrote:
> Hi
> The application has two characteristics:
>
> 1. DB access intensive - almost everypage has data fetching and a lot of
> tables
> 2. Real-time monitor - many pages have real-time interaction with a back-end
> server using AJAX.
>
> Budget is small so I can't afford a large cluster of Apache server, but high
> availability is still required.
>
> I have done a lot of work with PHP before, but I feel Lua is lighter and can
> be more scalable for what my application.
>
> Regards,
> Pete
>
For what it's worth, here are the specs and benchmarks for my application:
LuaSQL database backend
WSAPI server abstraction
Lighttpd + FastCGI
Running on a $15.00 a month VPS with 384Mib of guaranteed memory, and
768MiB of burst
I obtain the following benchmarks:
=====================================================
Concurrency Level: 40
Time taken for tests: 18.300119 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Total transferred: 7997128 bytes
HTML transferred: 7781572 bytes
Requests per second: 54.64 [#/sec] (mean)
Time per request: 732.005 [ms] (mean)
Time per request: 18.300 [ms] (mean, across all concurrent requests)
Transfer rate: 426.72 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 133 209 51.0 210 1074
Processing: 333 508 78.5 491 823
Waiting: 165 286 62.9 272 578
Total: 520 717 77.2 706 1743
Percentage of the requests served within a certain time (ms)
50% 706
66% 726
75% 740
80% 755
90% 796
95% 844
98% 895
99% 932
100% 1743 (longest request)
=====================================================
In short under normal loads with high levels of concurrency (40 as
shown above) I can server 54 pages a second. Each of these pages hits
the database a number of times (although I work to minimize it). I
think with the right tuning and an application that's written properly
you can definitely hit your targets.
- Jim
