Number of delta cycles exceeds the limit

[Amit Bhandu]

Hello All,
I am facing a SystemC warning:
----------
the number of delta cycles exceeds the limit of 10000, defined in sc_constants.h

this is a possible sign of an infinite loop.

----------

Can you help , what could be possible reasons of this warning, and how could I resolve it?

Thank you very much for your kind help.

Regards,

Amit

[karthickg]

It is what it says it is.

If you have:

void a_thread()
{
   for(int i=0; i<10000; i++) {
      wait(SC_ZERO_TIME);
   }
}

(or similar) - you will get the warning. You can get this in many other ways - example two threads triggering each other within one delta-cycle of each other.

Simulation time is not advancing, only delta cycles are.

[David Black]

It seems to be this could be an issue for some simulations. There are valid SystemC simulations where time is not advanced. For those simulations, I can see this as being an error. On the other hand, it seems obvious to me that for 99% of simulations this catches coding flaw. I have not looked at the code, but I hope there is a way to change the limit; otherwise, somebody should register an issue on GitHub.

I guess an important issue for the @Amit Bhandu: Are you intending that time should not move forward in your simulation?

[karthickg]

5 hours ago, David Black said:

It seems to be this could be an issue for some simulations. There are valid SystemC simulations where time is not advanced. For those simulations, I can see this as being an error. On the other hand, it seems obvious to me that for 99% of simulations this catches coding flaw. I have not looked at the code, but I hope there is a way to change the limit; otherwise, somebody should register an issue on GitHub.

I guess an important issue for the @Amit Bhandu: Are you intending that time should not move forward in your simulation?

Looks like it is only a warning - simulation itself doesn't terminate.