topic Problem with the IPP Data Compression running on a Quad Core pr in Intel® Integrated Performance Primitives

Problem with the IPP Data Compression running on a Quad Core processor

Rafael_de_Medeiros — Wed, 10 Feb 2010 13:18:12 GMT

I developed an applicationwhich use IPP Data Compression. The first code (which load the IPPDC library) is based on Delphi sample IPP Image Processing, available on IPP samples.

In this code, the ippdcGetLibVersion (ippiGetLibVersion on the sample)returns name = ippdcp8-6.0.dll+ if running at a Quad Core processor. Thisfile doesn t exist. I copy the ippdcp8-6.0.dll to ippdcp8-6.0.dll+ and it worked, but I need to know if this iscorrect.

Can you help me?

Rafael de Medeiros

Problem with the IPP Data Compression running on a Quad Core pr

Thomas_Jensen1 — Wed, 10 Feb 2010 13:23:40 GMT

Are you sure you used stdcall on all IPP functions in Delphi?

Problem with the IPP Data Compression running on a Quad Core pr

Rafael_de_Medeiros — Wed, 10 Feb 2010 14:27:28 GMT

Yes. Iam sure.

function ippGetLibVersion: PIppLibraryVersion; stdcall;

The configuration is 2 Intel Xeon E5506 2,13GHz Quad Core and the function IPPGetCPUType returns decimal 37 (hex 25 - ippCpuNehalem)

Problem with the IPP Data Compression running on a Quad Core pr

Ying_H_Intel — Thu, 11 Feb 2010 09:06:32 GMT

Hello,

I noticed you are calling IPP 6.0 dlls. How about try the latest IPP vesion: IPP 6.1 update 3?

You can downloadthe install package and sampleby following the instructionon http://software.intel.com/en-us/articles/ipp-downloads-registration-and-licensing/

Pleaselet us know if anyresult.

Thanks

Yign

Problem with the IPP Data Compression running on a Quad Core pr

Rafael_de_Medeiros — Thu, 11 Feb 2010 16:51:35 GMT

Hello,

Same problem with version 6.1. I emphasize that this problemoccurs only in this case.

This code is running in other 1000 clients without problem.

This is the sample of my code

result := LoadLibrary('ippdc-6.1.dll');
if (result <> 0) then begin
@tmpGetLibVersion := GetProcAddress(result,'ippdcGetLibVersion');
if (tmpGetLibVersion <> nil) then begin
version := tmpGetLibVersion;
loadedFullName := version.Name;

// In this point, the version.name = ippdcp8-6.1.dll+

FreeLibrary(Result);
Result := LoadLibrary(PChar(path + loadedFullName));
if (result <> 0) then begin
// Success
end else begin
loadedFullName := ComposeFullDllName(name, ipp_version);
// erro, load the old libray
result := LoadLibrary('ippdc-6.1.dll');
end;
end;
end;
end;

Thanks

Rafael

Problem with the IPP Data Compression running on a Quad Core pr

matthieu_darbois — Thu, 11 Feb 2010 18:29:01 GMT

Hi,

you don't have to unload ippdc-6.1.dll and try load ippdcp8-6.1.dll. Just go on with ippdc-6.1.dll

When you call functions in ippdc-6.1.dll, they are automatically mapped to the functions in the most suited DLL (in this case ippdcp8-6.1.dll)

You never have to worry about loading optimized DLL with IPP. You just load the dispatch DLL (the one with no xx extension). The rest of the work is already handled by Intel.

Regards,

Matthieu

Problem with the IPP Data Compression running on a Quad Core pr

Rafael_de_Medeiros — Thu, 11 Feb 2010 19:42:55 GMT

Hi Matthieu, Thanks foryou reply.

I understand this, but why the Delphi sample at the IPPSamples (w_ipp-samples_p_6.0.0.117\ipp-samples\language-interface\delphi\src) do this?

Thanks,

Rafael

Problem with the IPP Data Compression running on a Quad Core pr

Vladimir_Dudnik — Fri, 12 Feb 2010 05:07:11 GMT

Hello,

you do notneed to rename IPP files. The symbols '+' in string returned by ippdcGetLibVersion does not refer to file name. It is a notion that library may have tick-tock dispatcher in addition to traditional IPP dispatching mechanism.

Regards,
Vladimir

Problem with the IPP Data Compression running on a Quad Core pr

matthieu_darbois — Fri, 12 Feb 2010 08:27:43 GMT

Hi,

As I don't use Delphi, I didn't see these samples. Why Intel is providing this like that ? Just loading the dispatch should be sufficient. Someone from Intel could clarify this point ?

Matthieu

Problem with the IPP Data Compression running on a Quad Core pr

Albert_Stepanov — Tue, 16 Feb 2010 08:04:02 GMT

Hi,

When this sample was created there was only one dispatching mechanism. So '+' symbols in string were absent. And loading and unloading of libraries were developed in this sample to specify explicitly which processor-specific library should be loaded (Menu|Tools|Options...) and compare them performance.

Rafael, you can add following strings inyour code to remove symbols not relating to file name:

loadedFullName := version.Name;

indx := Pos('+', loadedFullName);

Delete(loadedFullName, indx, Length(loadedFullName)+1-indx);

If anything you think I can help you, please feel free to tell me.

Regards,

Albert

Problem with the IPP Data Compression running on a Quad Core pr

Chao_Y_Intel — Wed, 21 Apr 2010 15:03:02 GMT

For those who are using the sample, the fixed is includedin IPP 6.1 update 5 release.

Thanks,
Chao