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Re: PWL as file (of PWM) make LTSPICE XVII hang

 

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I suspect this is a function of CPU, disk, perhaps memory, and possibly LTspice/OS version.

My figures were:
1m:??? ??? 0.187s
10m:??? ? 1.325s
100m:??? 12.8s
1:??? ??? ??? 126s

So, once past the first step, the execution time remains approximately a linear function simulation time. I don't get any msg: "expanding repeating PWL()". Perhaps this is an improvement of 17.1.x?

The figures were about the same whatever number of threads I limited LTspice to use (not surprisingly).

--
Regards,
Tony


On 30/07/2023 23:13, Andy I wrote:

FYI -- For me, it still hangs (or takes a VERY long time) when I include the REPEAT FOREVER ... ENDREPEAT around the PWL file.? I do not have experience with that particular format, so I can't tell you why it does not seem to like it

With .tran 10m, it's quick.? 0.7 seconds.
With .tran 100m, it's much slower.? 16 seconds.? Most of the extra time is "expanding repeating PWL()".
With .tran 1, it's MUCH MUCH slower.? It takes more than 18 minutes.? It did eventually finish.

Apparently?the CPU time to assemble the repeating PWL is not proportional to the requested simulation time,?for whatever reason.
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