Intel® Quartus® Prime Software
Intel® Quartus® Prime Design Software, Design Entry, Synthesis, Simulation, Verification, Timing Analysis, System Design (Platform Designer, formerly Qsys)
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Reproducing identical SOF when recompiling with identical source

i8087
Novice
792 Views

Hi,

For example in Quartus Prime Pro 20.4, can I expect to get an identical SOF everytime I recompile a design with no changes in the source?

Is there any documentation on this?

Thanks!

 

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YuanLi_S_Intel
Employee
764 Views

Having fixed seed value doesn’t mean that it will have same routing.

 

Having different seed value (AKA seed sweeping) is just retry compilation with different starting point. It might yield different timing result.

 

You may refer to timing user guide for more information ahout it:

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/an/an584.pdf


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YuanLi_S_Intel
Employee
777 Views

Hi,


No, it might not be the same everytime. The internal routing done by fitter will not the same for each recompilation.


However, the size should be the same for same source code.


Regards,

Bruce


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i8087
Novice
771 Views

Thank you Bruce for your reply.

How about using a fixed seed? Would it still not guarantee identical internal routing?

What's the purpose of using a seed in DSE?

Regarding the size, I could be wrong, but I think I'm getting identical size even for a different source code.

Thanks!

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YuanLi_S_Intel
Employee
765 Views

Having fixed seed value doesn’t mean that it will have same routing.

 

Having different seed value (AKA seed sweeping) is just retry compilation with different starting point. It might yield different timing result.

 

You may refer to timing user guide for more information ahout it:

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/an/an584.pdf


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i8087
Novice
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i8087
Novice
758 Views

What should I do to get an identical SOF when recompile?

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YuanLi_S_Intel
Employee
749 Views

Having the same source code and same seed value should yield the same SOF. Unless there is a change in source code.


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