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How to run dhrystone test on Pulpino Core #138

Open ellenFan opened 6 years ago

ellenFan commented 6 years ago

Hi all

I tried to run the dhyrstone test on Pulpino RISCY Core by adding source code (dhrystone.c dhrystone.h dhrystone_main.c encoding.h /from env folder/ util.h) and used cmake to add this application (details on how to add an application to pulpino could be found in the following link:https://github.com/pulp-platform/pulpino/blob/master/sw/README.md )

It compiled but when I run the pulpino-converted spi version of the dhrystone application on the zedboard, I got the following error: PULPino: Measured time too small to obtain meaningful results I also checked the start time and end time, they are all zero. I tried to increase the number of runs but even if it takes longer time(longer than one second) to give a feedback, start/end time are also zero.

According to dhrystone.h, the Start_Timer and End_Timer functions in my case are defined as:

define Start_Timer() Begin_Time = read_csr(mcycle)

define Stop_Timer() End_Time = read_csr(mcycle)

Someone else online also has similar issues when testing dhrystone on Cortex-M4 and their problem is caused by missing time measurement functions in the testing environment. They finally solved it by using Cortex-M4's own system timer to count cycles. (Here's the link http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka16826.html)

What might be the causes in my case? If time measurement functions are missing, what other source code or path should I add? Our system is Ubuntu 16.04.4, the riscv tool chain of our system is provided by pulpino (link: https://github.com/pulp-platform/ri5cy_gnu_toolchain)

Really appreciate your help

Irdroid commented 1 year ago

Same issue here on Pulpissimo. It appears that it is trying to read the cycles count registers which are defined in encoding.h and depending on the pulp core that you use it may be at different address.

did you manage to find a fix for that?

Irdroid commented 1 year ago

We have managed to compile and run the Dhrystone CPU benchmark tests on Pulpissimo, you can have a look at the code in our GitHub repo.

The reason you get zero counting for the cycles counter and instructions counter is because Pulpino/Pulpissimo RISC-V CPUs have non-standard cycles/instructions counter registers, thus modification to the code is needed.