add gin benchmark

[hypebeast]

Hi Matthew,

I added a Gin (https://github.com/gin-gonic/gin) based benchmarker to the project. Gin is a more Go idiomatic Sinatra style microframework for Go. I think it would be a good addition to this showdown.

On my machine I got the following results:

$ go get github.com/gin-gonic/gin
$ GOMAXPROCS=4 MARTINI_ENV=production go run server.go
[GIN-debug] GET   /:title                   --> main.func·001 (2 handlers)
[GIN-debug] Listening and serving HTTP on :3000

$ ./wrk -t4 -c100 -d30S --timeout 2000 "http://127.0.0.1:3000/showdown"
Running 30s test @ http://127.0.0.1:3000/showdown
  4 threads and 100 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     2.83ms    3.62ms  57.75ms   97.92%
    Req/Sec    10.77k     1.91k   14.44k    82.29%
  1220584 requests in 30.00s, 2.36GB read
Requests/sec:  40686.61
Transfer/sec:     80.40MB

Compared to Martini:

Running 30s test @ http://127.0.0.1:3000/showdown
  4 threads and 100 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     8.77ms    4.55ms  71.54ms   82.16%
    Req/Sec     2.91k   239.18     4.31k    72.46%
  342695 requests in 30.00s, 682.07MB read
Requests/sec:  11424.21
Transfer/sec:     22.74MB

[mroth]

I'm going to add this to the next round of benchmarks. Initial performance results are extremely promising.

Some questions/suggestions:

1. Looking at https://github.com/gin-gonic/gin#html-rendering, is there a reason you are not using the built-in LoadHTMLTemplates() with the templates directory? (If not, we should switch to this to keep the style as similar as possible across versions.)
2. I noticed in your logs you called it with MARTINI_ENV=production. Does Gin look for Martini's env variables for compatibility? Or is this a typo?
3. In the documentation I see the gin.H convenience shortcut, which looks nice because it can potentially help with the ugliest part of the Martini code, which was having to create a custom struct just to pass the data along. So unless I am mistaken I believe we can do replace that context creation with something such as context := gin.H{"Title": title, "Members": members}? Or actually even use gin.H instances entirely and get rid of the custom types? (This would be much cleaner and similar to what we are doing in other languages.)

[chrismccord]

All of these benchmarks are tricky to to get right, but it's worth mentioning that all the solutions today do mount a static middleware that run for each request.

[hypebeast]

I just updated the PR.

1. I now use the LoadHTMLGlob() instead of parsing the templates manually. The LoadHTMLTemplates() is deprecated.
2. This was a typo. The correct call is GOMAXPROCS=4 GIN_MODE=release go run server.go.
3. Yes, it's possible to get rid of the custom types. I updated the code accordingly. But I think the same should be possible for the Martini code, too.

[mroth]

FYI I am working towards integrating this in PR #8, if you wish to follow along!