JPEG compression in IPP 6.x vs 7.0

[cyberdemon1]

Hi!

I'm using UIC jpeg encoder with IPP 6.x and everything is ok (and fast :) ).

My CPU is Core i5-2500

Today I installed IPP 7.0 trial, encoder was recompiled and I've got about only0-3% performance boost. In other words, zero :(

I checked dispatcher - in new code (with ipp7) encoder uses g9 methods (at least for RGB -> YUV conversion).

Only one thread is used.

Is it normal situation? I thought that I will get some benefits from AVX.

[PaulF_IntelCorp]

The functions that have been optimized for AVX are primarily floating point. I believe many of the functions used by the UIC JPEG encoder are integer based. For a complete list of the IPP functions that have been hand-tuned for AVX, please see this article:

http://software.intel.com/en-us/articles/intel-ipp-functions-optimized-for-intel-avx-intel-advanced-vector-extensions/

Note that the UIC JPEG encoder also takes advantage of multi-threading, which can provide substantial acceleration, in addition to SIMD. So you may simply be seeing a larger percentage of acceleration due to the multi-threading when compared to the SIMD. The combination of the two will generally give the best results, which is what you're seeing with the UIC implementation.

[Naveen_G_Intel]

Hi,

Are you using prebuilt binary you can refer to discussion in the forum on the same opic.

Regards,

Naveen GV

[Ying_H_Intel]

Hello,

I'm glad to notifythat the one-thread issue in UIC jpeg codec is resolved in the new release:
Intel IPP 7.0 update 4 is shipping as of May 12, 2011.

You are welcomed to try it

Regards,
Ying H.