Thread Limits

Remoting SDK
1

Hello,

I have the method below on my server and generally it works well.

But in times of high server usage, the response to the client takes a long time and this seems to affect the entire server.

At these times, I sometimes have up to 100 clients connected and many of them accessing the same service.

About this scenario:

Is there a maximum number of threads that can be opened on the server?

Is there a maximum connection time for executing the procedure?

Any suggestions to improve this process?

    [ROServiceMethod]
    [ROCustom('HttpApiPath','getboleto')]
    [ROCustom('HttpApiMethod','GET')]
    function getBoleto([ROCustom('HttpApiQueryParameter','1')] codempresa: Integer;
                       [ROCustom('HttpApiQueryParameter','1')] numlancamento: Integer): Binary;



function TSispetroWeb.getBoleto(codempresa, numlancamento: Integer): Binary;
var
  lStream: TMemoryStream;
  lFilename: string;
begin
  lStream := TMemoryStream.Create;
  try

    Result := TROHttpApiResult.Create(HTTP_200_code, id_ContentType_application_pdf,'',false);

    try
      GetBoletoStream(codempresa, numlancamento, lFilename, lStream, conexao);
      result.LoadFromStream(lStream);
    except
      on E: Exception do begin
        FSiSession.LogError('SispetroWeb: erro ao gerar boleto ->' + e.Message);
      end;

    end;

  finally
    FreeAndNil(lStream);
  end;
end;
2

Hi,

Your method (GetBoletoStream) can consume all CPU resources especially when you have 100 simultaneous connections.

What HTTP server are you using? we have 5 different HTTP servers in Delphi.

You can change default class factory with pooled one. Pooled class factory is more suitable for high performance and high load services

3

I’m using TRoIndyHttpServer. Is there a limit on this server? Would you recommend using another one? If yes, why?

Some example for Pooled class factory.

Thanks

4

Hi,

We haven’t apply any limitations for TROIndyHttpServer, but they may be on Indy level.

You can try to use TROHttpServer - it may show better performance. it is based on Microsoft HTTP Server API. You can set up number of threads via TROHTTPServer.ThreadPool property.

Check Class Factories sample (Delphi)

5

Hi,

I have a 6th HTTP Server implementation based on RealThinClientSDK which now it’s open source. The source might needs some more polishing but it works for me, for more than a year and a half this DAServer is the back-end of our company’s website.

I also create a new descendant of TROClassFactory, an ROClassFactory based on this idea:

If anyone is interested I can share the code.

Chris