Simple web server benchmark - vibe.d is slower than node.js and Go?

[Arun Chandrasekaran]

On Monday, 30 October 2017 at 17:23:02 UTC, Daniel Kozak wrote:
> Maybe this one:
>
> import vibe.d;
> import std.regex;
> import std.array : appender;
>
> static reg = ctRegex!"^/greeting/([a-z]+)$";
>
> void main()
> {
>     setupWorkerThreads(logicalProcessorCount);
>     runWorkerTaskDist(&runServer);
>     runApplication();
> }
>
> void runServer()
> {
>     auto settings = new HTTPServerSettings;
>     settings.options |= HTTPServerOption.reusePort;
>     settings.port = 3000;
>     settings.serverString = null;
>     listenHTTP(settings, &handleRequest);
> }
>
> void handleRequest(HTTPServerRequest req,
>                     HTTPServerResponse res)
> {
>     switch(req.path)
>     {
>     case "/": res.writeBody("Hello World", "text/plain");
>         break;
>     default:
>         auto m = matchFirst(req.path, reg);
>         string message = "Hello, ";
>         auto app = appender(message);
>         app.reserve(32);
>         app ~= m[1];
>         res.writeBody(app.data, "text/plain");
>     }
> }
>
> On Mon, Oct 30, 2017 at 5:41 PM, ade90036 via Digitalmars-d < 
> digitalmars-d at puremagic.com> wrote:
>
>> On Thursday, 21 September 2017 at 13:09:33 UTC, Daniel Kozak 
>> wrote:
>>
>>> wrong version, this is my letest version: 
>>> https://paste.ofcode.org/qWsQi kdhKiAywgBpKwANFR
>>>
>>> On Thu, Sep 21, 2017 at 3:01 PM, Daniel Kozak 
>>> <kozzi11 at gmail.com> wrote:
>>>
>>> my version: https://paste.ofcode.org/RLX7GM6SHh3DjBBHd7wshj
>>>>
>>>> On Thu, Sep 21, 2017 at 2:50 PM, Sönke Ludwig via 
>>>> Digitalmars-d < digitalmars-d at puremagic.com> wrote:
>>>>
>>>> Am 21.09.2017 um 14:41 schrieb Vadim Lopatin:
>>>>>
>>>>> [...]
>>>>>>
>>>>> Oh, sorry, I forgot the reusePort option, so that multiple 
>>>>> sockets can listen on the same port:
>>>>>
>>>>>     auto settings = new HTTPServerSettings("0.0.0.0:3000");
>>>>>     settings.options |= HTTPServerOption.reusePort;
>>>>>     listenHTTP(settings, &handleRequest);
>>>>>
>>>>
>> Hi, would it be possible to re-share the example of vibe.d 
>> woth multithreaded support.
>>
>> The pastebin link has expired and the pull request doesnt have 
>> the latest version.
>>
>> Thanks
>>
>> Ade

With vibe.d 0.8.2, even when multiple worker threads are setup, 
only one thread handles the requests:

```
import core.thread;
import vibe.d;
import std.experimental.all;

auto reg = ctRegex!"^/greeting/([a-z]+)$";

void main()
{
     writefln("Master %d is running", getpid());
     setupWorkerThreads(logicalProcessorCount + 1);
     runWorkerTaskDist(&runServer);
     runApplication();
}

void runServer()
{
     auto settings = new HTTPServerSettings;
     settings.options |= HTTPServerOption.reusePort;
     settings.port = 8080;
     settings.bindAddresses = ["127.0.0.1"];
     listenHTTP(settings, &handleRequest);
}

void handleRequest(HTTPServerRequest req,
                     HTTPServerResponse res)
{
     writeln("My Thread Id: ", to!string(thisThreadID));
     // simulate long runnig task
     Thread.sleep(dur!("seconds")(3));
	
     if (req.path == "/")
         res.writeBody("Hello, World! from " ~ 
to!string(thisThreadID), "text/plain");
     else if (auto m = matchFirst(req.path, reg))
         res.writeBody("Hello, " ~ m[1] ~ " from " ~ 
to!string(thisThreadID), "text/plain");
}
```

That could be the reason for slowness.