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2011, Thursday May 26

Calling a 64 bit library from a Delphi 32 bit process

Since we are still waiting for a Delphi 64 bit compiler, the only available solution to access a 64 bit library from an application written in Object pascal, is to use the 64 bit version of the FreePascal Compiler.

But you just can not recompile your VCL/GUI based Delphi application with FPC:

  • Some low-level part of your code may not be directly compatible with a 64 bit process (e.g. since the pointer size changed);
  • The GUI part of the application can not be ported directly with FPC - the Lazarus project try to be as close as possible to VCL, but it can be a very difficult, either impossible if you use some third-party components.
I just found out a solution from CodeCentral, allowing to call any 64 bit dll from a Delphi 32 bit process.

Continue reading...

2011, Friday May 20

How to write fast multi-thread Delphi applications

How to make your software run fast, especially in a multi-threaded architecture?

We tried to remove the Memory Manager scaling problems in our SynScaleMM. It worked as expected in a multi-threaded server environment. Scaling is much better than FastMM4, for some critical tests. But it's not ready for production yet...

To be honest, the Memory Manager is perhaps not the bigger bottleneck in Multi-Threaded applications.

Here are some (not dogmatic, just from experiment and knowledge of low-level Delphi RTL) advice if you want to write FAST multi-threaded application in Delphi.

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2010, Saturday December 4

SynScaleMM - a multi-thread scaling Memory Manager

We just released a new unit to the source code repository.

It's a simple, small and compact MM, built on top of the main Memory Manager(FastMM4 is a good candidate, standard since Delphi 2007), architectured in order to scale on multi core CPU's (which is what FastMM4 is lacking).

Original code is ScaleMM - Fast scaling memory manager for Delphi by André Mussche.

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When inlining works

It was told on this Blog that the Delphi memory manager (FastMM4 since Borland 2006 - but it was even worse with the previous "Borland's" MM), doesn't scale well on multi-code CPU. That is, if you have a multi-threaded application with a lot of memory handling (e.g. aString := aString+someString), the Delphi MM won't scale with multi cores. When I mean "don't scale", I mean that the optimistic though of "my CPU has 4 cores, therefore the same work run in 4 threads will be 4 times faster than with 1 thread" is false. It performs even worse with multiple threads than with 1 thread...

So we went into forking a nice project, named ScaleMM, and created our scalable optimized MM, named SynScaleMM. Our forked modifications were even included in the main ScaleMM branch.

During my profiling of our SynScaleMM, I discovered some very nice results with Delphi compiler inlining features.

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2010, Tuesday August 10

Writing Delphi code for 64 bits compiler

There will be an upcoming 64 bits Delphi compiler. Embarcadero promised it.

Florian (the architect of FPC) showed a first "Hello world" program for Win64 in March 2006.
This was remarkable since GCC and the binutils don't even support this target at this time.
In fact, FPC used its Internal linker on Win32 and Win64 platforms, just like Delphi does.

Here are some points on how you could make your code ready to compile under FPC 64 bits, therefore (I hope) under future Delphi 64 bits compiler.

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2010, Friday July 30

Compiler enhancement proposal: threadlocalvar

As I wrote in a previous post, Delphi string, dynamic array and memory manager don't like multi-core CPU.

My proposal is to add a threadlocalvar keyword, to be used instead of var in your code, to mark some variables to be used in only the current thread. Then the compiler and RTL won't have to use the LOCK instruction, and the application will be MUCH faster in multi-thread environment.

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2010, Thursday July 15

Delphi doesn't like multi-core CPUs (or the contrary)

If you're like me, you are proud of the new CPU your computer runs on - in my case a i7-720Q with 8 embedded cores...

But Delphi is not very multi-thread or multi-core friendly... guess why....

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2010, Sunday March 28

Mac OS X Stack Alignment, asm and trolls

In a very interesting commentPhiS spoke about the Mac OS X Stack Alignment problem, and the way asm code should be written for the future Cross Platform Delphi compiler. Here are some (hope without any Troll hidden) reflections I went through.

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2010, Wednesday March 24

Fast JPEG decoder using SSE/SSE2 version 1.2

The Fast JPEG decoder using SSE/SSE2 library file has been updated, and is now in version 1.2, released under a MPL/GPL/LGPL tri-license. It's mainly a bug issue fix.

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2010, Tuesday March 23

CopyRecord faster proposal

After some speed debates occurred in the Delphi community, I've rewritten the _CopyRecord function of the system.pas unit, with speed in mind.

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2010, Thursday March 18

Fast JPEG decoder using SSE/SSE2 version 1.1

The Fast JPEG decoder using SSE/SSE2 library file has been updated, and is now in version 1.1, released under a MPL/GPL/LGPL tri-license.

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2010, Sunday March 14

Fast JPEG decoder using SSE/SSE2

This LGPL-distributed unit allows very fast JPEG image decoding, using SSE/SSE2 pure assembly code. It is much faster than the standard jpeg.pas unit.

It's based on the great Dr. Manhattan's source code, from http://sourceforge.net/projects/jpegdec

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