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Optimal stream packet size

Posted on 2004-04-05
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Last Modified: 2010-04-05
I am streaming data from a TMemoryStream to clients using the following code.

  m.Seek(0,soFromBeginning);
  repeat
      begin
      {Play}
      Count := m.read(b,1024);
      AThread.Connection.WriteBuffer(b,count,True);
      sleep(5);
      end;
    until count<>1024;

What are your suggestions on the size of the data to send? 1024 bytes seems rather small. Typically the entire memory stream will be at least 5 megs. Normally the data will only be transferred on a LAN
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Question by:rbohac
1 Comment
 
LVL 11

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by:
shaneholmes earned 200 total points
ID: 10761896
1024 is the block norm, but testing your app and adjusting according will be the best method of determining the optimization for your application & network, watching your CPU & memory resources to determine the optimal.

I would add the capability of editing the value from a options dialog or such, and making this value persistent to the registry.

This way, users can change the value to optimize it to their network


 Count := m.read(b, gBufSize);


Unit UntReg;

interface

uses Windows, Registry, Classes, SysUtils;

procedure ReadRegistry;
procedure WriteRegistry;

var
 gBuffSize: Integer;
 
implementation

procedure WriteRegistry;
var
 Reg: TRegistry;
begin
  Reg := TRegistry.Create;
  try
    Reg.RootKey := HKEY_CURRENT_USER;
    if Reg.OpenKey('\Software\YourCompanyName\YourAppName\', True) then
    begin
      Reg.WriteInteger('Buffer Size', gBufSize);
      Reg.CloseKey;
    end;
  finally
    Reg.Free;
  end;
end;

procedure ReadRegistry;
var
 Reg: TRegistry;
begin
  Reg := TRegistry.Create;
  try
    Reg.RootKey := HKEY_CURRENT_USER;
    if Reg.OpenKey('\Software\YourCompanyName\YourAppName\', True) then
    begin
     if Reg.ValueExists('Buffer Size') then
       gBufSize := Reg.ReadInteger('Buffer Size');
      Reg.CloseKey;
    end;
  finally
    Reg.Free;
  end;
end;

initialization
  begin
    ReadRegistry;
  end;

finalization
begin
  WriteRegistry;
end;

end.
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