Performance issue

[christianhellsten]

I'm benchmarking Hobbit with "hat" and I'm seeing some weird behavior.

I'm using Puma:

puma -t 16 -w 2 -e production

The results are not that great on the latest iMac:

$ wrk -t 2 http://localhost:9292/
Running 10s test @ http://localhost:9292/
  2 threads and 10 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     8.27ms    4.75ms  31.29ms   72.14%
    Req/Sec   492.83    232.84     0.91k    51.49%
  8698 requests in 10.00s, 8.04MB read
  Socket errors: connect 0, read 0, write 0, timeout 15
Requests/sec:    869.77
Transfer/sec:    823.12KB

However, if I comment out everything inside the /assets block, plus remove the assets from the layout file, I get a pretty decent result:

$ wrk -t 2 http://localhost:9292/
Running 10s test @ http://localhost:9292/
  2 threads and 10 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     2.16ms    2.42ms  24.30ms   87.62%
    Req/Sec     2.48k   377.00     3.56k    72.97%
  46861 requests in 10.00s, 43.31MB read
Requests/sec:   4686.19
Transfer/sec:      4.33MB

In other words:

map '/assets' do
# removed
end

What's the reason for this slowness, anything that can be done to speed things up?

[patriciomacadden]

Hi @christianhellsten.

That's because Sprockets does a lot of things in order to serve your assets (compress them, set headers, etc.). You can use Rack::Static if you want a more performant solution (obviously you won't get an "asset pipeline"). Here is an example: https://github.com/patriciomacadden/hobbit/wiki/Serving-static-files

[christianhellsten]

Ok, so you're saying it's normal behavior that the /assets block and sprockets is called, even after commenting out these lines in application.erb:

<link rel="stylesheet" href="/assets/application.css"/>
<script type="text/javascript" src="/assets/application.js"></script>

[patriciomacadden]

That shouldn't happen. If you don't request any /asset route, Sprockets::Environment shouldn't be called. See how sprockets work: https://github.com/sstephenson/sprockets/blob/master/lib/sprockets/server.rb