help needed on testing FPU

[cypher007]

ok ive not used my Amigas to any degree for years and currently pulling my hair out.

ive got a A1200 with aca 1233n and an fpu running at 50mhz. os is wb 3.1 i think.

anyway i cant find get anywhere with some of the utils im finding. sysspeed wont run and aibb is giving me results that dont look right compared to the results online.

is there a util i can run that doesnt need a new OS? and will test the FPU fully?

[amiman99]

Do you need performance numbers only, or any software to test if your FPU is working?

You can use Vista Pro FPU version to render some scene. Any 3D rendering sw with FPU support.

[cypher007]

some numbers for comparison would be good thank you.

i will try and find vista pro. has it got an FPU only version? as otherwise i wont know if its using the FPU.

[amiman99]

I think it has both versions. I used it to test my FPU on my A3000.

Cinemorph, has FPU version also.

[Kin Hell]

Originally Posted by cypher007

some numbers for comparison would be good thank you.

i will try and find vista pro. is has it got an FPU only version? as otherwise i wont know if its using the FPU.

Most Amiga programs that can utilise an FPU, will utilise an FPU if one is in the System. At the point of Installing the software, most install procedures automatically install the FPU version of the program if one is present, but if IIRC, Vista Pro will ask you if you want to install FPU or INT before it actually installs.

Integer calculating (CPU) is slower than Floating Point Unit calculating so you will see a huge difference in the Render times.

Take AIBB for instance. The Beach ball render takes forever without an FPU.

Is there an option to disable the FPU on Jens ACA 1233N card without physically removing it? - Try AIBB Beach Ball render with & without FPU to see the difference.

[PeterK]

You can download and install the demo versions of the HSMathLibs for 68881/2, which will map all the IEEE and FFP functions of the math libraries directly to the FPU instead of using the CPU for floating point calculations.

Or alternately, you can install my own free MathLibsUAE, which are also working on any real Amiga with a 68881/2 FPU, but are not demo versions, no nag requester.

Then, after installing these MathLibs, you can test all FPU functions with the benchmark programs of the HSMathLibs, which will do 2 or 3 calculations for every function and show you the correct result as well the output from FPU in comparison. You just have to enter the number of passes that the benchmark should repeat in a loop for the speed tests, which are not important in this case. You can use a low value like 100-1000 for just getting the results of the calculations.

http://www.hsmathlibs.de/index_e.html
http://www.hsmathlibs.de/HSML_public...0-881-demo.lha
http://www.hsmathlibs.de/HSML_public/Benchmarks_e.lha

http://aminet.net/package/util/libs/MathLibsUAE

[Nightshft]

Apfelkiste is a fractal renderer that includes an 000 and an 030 executable. The 030 is faster and will only run with fpu.

[cypher007]

Thanks all will go and do some tests.

[Jacques]

Originally Posted by Nightshft

Apfelkiste is a fractal renderer that includes an 000 and an 030 executable. The 030 is faster and will only run with fpu.

Thanks for that, I'm looking for some way to test 68882 I bought on eBay, but did you actually test it against FPU usage?


Aminet description says following:


"Apfelkiste" is yet another mandelbrot program, but very fast and simple to use. It has special assembly routines for fixpoint calculation. Includes versions for 1.3 and 2.0, 68000 and 68030 each.

There's no information pointing about requirement/usage of FPU...

[Nightshft]

Been a while since I last used it.
IIRC the 000 version runs without fpu and the 030 version is faster, but needs a fpu or it would fail on start (error #8000 000b).
Also when running the program click on FXP and not Float. It will use the fpu and be faster nevertheless.

[Jacques]

I will test, thank you.

[Thomas Richter]

There is also DeluxeMandelbrot (DMandel) which also includes FPU and CPU versions, also mathieee versions, and fixpoint versions. However, similar to other fractal renderers, it serves only as very incomplete test of the FPU as it only uses elementary algebra (+,.,*) and no transcendental functions which may be more critical.

[apex]

We would need a real 68882 test tool.
Who can write such an cli tool?

[SpeedGeek]

Hmm... did everyone forget about ShowConfig? AmigaOS CPU command?

The first step is to verify the FPU is installed (correctly) and working. Then the benchmark programs, fractal and mandelbrot demos and even the FPU specific math libraries should work fine.

[Seiya]

Scenery Animator v4 is landscape generator like Vista Pro and use FPU

[supaduper]

Here is a link to POVray-test, it will test many types of CPU with or witout FPU with test output uses raytracing as stress testing
https://mega.nz/file/M842nYbY#ooV6Xu...CDOxqPyri22Bmk