Tunç Bahçecioğlu » coding http://www.tuncbahcecioglu.com carpe omnium Tue, 26 Oct 2010 13:43:06 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 delphi and mpi, closer look 2 http://www.tuncbahcecioglu.com/posts/delphi-and-mpi-closer-look-2/ http://www.tuncbahcecioglu.com/posts/delphi-and-mpi-closer-look-2/#comments Mon, 10 Aug 2009 11:11:42 +0000 tunc http://www.tuncbahcecioglu.com/posts/delphi-and-mpi-closer-look-2/ It is pretty simple to install and use MPI with Delphi, fortunately for us programming the MPI is no bother too.

The second part is about calling MPI functions from Delphi.

Name Convention

No change here. Since we are using a direct translation of the original MPI header, all the original names are there.

Sending, Receiving Data

No surprise here too, here are some pointers:

Variables

Since MPI needs pointers to variables, use @ operator to get the pointer to your variables.

MPI_Comm_rank(MPI_COMM_WORLD,@myid);

For getting the size of variables use the sizeoff function.

Arrays

Again we need the starting address of the arrays.

Lets say we have an array named as “sizeArray”

For dynamic arrays use @(sizeArray[0])

For static arrays use  @(sizeArray[1]) //  assuming the array starts from 1

Strings

Since no one knows the memory map of a Delphi string you cannot use them with MPI. You have to go with short strings.

Debugging

Bad news here, Delphi has no support for parallel debugging. You have to go with displaying data to screen, or using a log file.

I was going to write a 3rd article about creating parallel applications with GUI, but since it is a general subject I decided to write the article separately, so this series and here.

]]> http://www.tuncbahcecioglu.com/posts/delphi-and-mpi-closer-look-2/feed/ 2 pugg http://www.tuncbahcecioglu.com/posts/pugg/ http://www.tuncbahcecioglu.com/posts/pugg/#comments Mon, 03 Aug 2009 00:15:30 +0000 tunc http://www.tuncbahcecioglu.com/posts/pugg/ a c++ framework for plug-in management

Features

  • Header only library, no installation
  • Auto loading of plug-ins from files
  • Version control for plug-ins
  • Object oriented design

Web Pages

http://pugg.sourceforge.net/
https://sourceforge.net/projects/pugg/

]]> http://www.tuncbahcecioglu.com/posts/pugg/feed/ 1 Installing boost for visual studio http://www.tuncbahcecioglu.com/posts/installing-boost-for-visual-studio/ http://www.tuncbahcecioglu.com/posts/installing-boost-for-visual-studio/#comments Mon, 03 Aug 2009 00:06:01 +0000 tunc http://www.tuncbahcecioglu.com/posts/installing-boost-for-visual-studio/ Boost is a collection of free libraries for c++, kind of a Swiss knife for the c++ geek.
Most of boost is actually header only and don’t need any installation. To use the small dark part of boost
you need to install them, well built them, here is how:

Short, Softcore Method:

Go to BoostPro Computing and download a web installer. Follow the installer instructions.
It needs a free registration, and it does not contain some libraries like Boost.Python

Long, Hardcore Method:

This is the programmers way., we will built the libraries ourselves.

1.We start by downloading Boost Source code from Sourceforge

2.Extract the zip file  to a nice folder, for me it is c:\Program Files\Boost\

3.Build BJam

Bjam is a tool that will help us built BOOST, but we first have to built it:
-Open visual studio Comman Prompt ,
start->All Programs->Microsoft Visual Studio 2005->visual studio tools->visual studio command prompt
cd C:\Program Files\boost\boost_1_39_0\tools\jam\src>
built.bat
This made the following C:\Program Files\boost\boost_1_39_0\tools\jam\src\bin.ntx86\bjam.exe
Now copy bjam.exe to the root boost directory : C:\Program Files\boost\boost_1_39_0\

4.Build Boost

from the visual studio command promt go to C:\Program Files\boost\boost_1_39_0\
For a complete set of libraries use the following:
bjam –toolset=msvc-8.0 –build-type=complete
If you want a sub set here are your options:
bjam toolset=msvc-8.0 variant=debug threading=multi link=shared
bjam toolset=msvc-8.0 variant=release threading=multi link=static
Now this will take some time…

5.Enjoy

Your lib directory is C:\Program Files\boost\boost_1_39_0\stage\lib
Yout include directory is C:\Program Files\boost\boost_1_39_0\include

For details of this process you can refer to Boost getting started web pages

]]> http://www.tuncbahcecioglu.com/posts/installing-boost-for-visual-studio/feed/ 0 send std::string with mpi http://www.tuncbahcecioglu.com/posts/send-stdstring-with-mpi/ http://www.tuncbahcecioglu.com/posts/send-stdstring-with-mpi/#comments Sun, 02 Aug 2009 02:12:45 +0000 tunc http://www.tuncbahcecioglu.com/posts/send-stdstring-with-mpi/ The idea is to send the size of the string first and then allocate the storage on the reciever. Here is an example with broadcast.

string s = "before";
int size = 0;
if (myRank == 0)
{
   s = "after";
   size = s.size();
}
BroadCast(&size,1);
if (myRank != 0) s.resize(size);
BroadCast(s.data(),size);
]]> http://www.tuncbahcecioglu.com/posts/send-stdstring-with-mpi/feed/ 0 Delphi and mpi in 4 steps http://www.tuncbahcecioglu.com/posts/delphi-and-mpi-in-4-steps/ http://www.tuncbahcecioglu.com/posts/delphi-and-mpi-in-4-steps/#comments Sun, 02 Aug 2009 01:31:28 +0000 tunc http://www.tuncbahcecioglu.com/posts/delphi-and-mpi-in-4-steps/
  • Download and install MPICH2
  • Download mpi.pas from lazarus site and put it in your project. http://wiki.lazarus.freepascal.org/MPICH
  • Comment out any code that gives error in MPI.pas (Lazarus pascal is a little bit different than Delphi object pascal)
  • Write your code! 
    • program HelloWorld1;

uses  MPI;

var myid: integer;
begin
MPI_Init(nil,nil);
MPI_Comm_rank(MPI_COMM_WORLD,@myid);
writeln('id=',myid);
MPI_Finalize;

end.
    ]]>     http://www.tuncbahcecioglu.com/posts/delphi-and-mpi-in-4-steps/feed/ 1