Re: [Iverilog-devel] periodic updating of vcd file

[Joshua S. <kni...@gm...>]

gosh so sorry to bother this newsgroup with my noobness. I manually checked
the file size from the C code and realized that the file does flush
correct, but windows doesn't update its file sizes. Supposedly a feature of
NTFS
http://blogs.msdn.com/b/oldnewthing/archive/2011/12/26/10251026.aspx

So in my C# code when I checked to see whether the file size changed, I was
getting nothing.  Now I know that I just need to manually check the file
size instead of using the function I called in C# and I should be able to
check if anything has changed.

Thanks,


Josh

On Wed, May 13, 2015 at 3:16 PM, Joshua Street <kni...@gm...>
wrote:

> I don't think I need it to output every simulation time step. I just don't
> think it's flushing at all. The flush call returns true, but the file size
> hasn't changed. I am not at all sure what is going on. I will try to play
> with it a bit more. Otherwise, the only other solution I can think of is to
> just close the file handle and reopen it, which definitely is updating the
> vcd properly
>
> On Wed, May 13, 2015 at 2:52 PM, Cary R. <cy...@ya...> wrote:
>
>> Getting this back on the development list.
>>
>> Yes, VCD output is only output at the end of the simulation time step. It
>> is not done interactively as the values change otherwise you would have a
>> huge amount of excess data as values stabilize to their final value. I
>> would not call this from the scheduler, but if needed do it as a final step
>> when emitting VCD output for a given time step. I believe that is at the
>> end of the variable_cb_2() call back routine.
>>
>> Cary
>>
>>
>>
>>   On Wednesday, May 13, 2015 11:43 AM, Joshua Street <
>> kni...@gm...> wrote:
>>
>>
>> so I think I'm still confused as to how to call the vpi callback
>> functions from within schedule.cc.
>>
>> I thought that since these two functions were called in stop.cc that I
>> could also call these and have it immediately flush.
>>
>>  invoke_command_const("$fflush");
>>  invoke_command_const("$dumpflush");
>>
>> However, I think flush is the command I want. The only problem is that it
>> doesn't seem to execute flush immediately.
>>
>> I'm guessing from trying to read the source that a callback handler is
>> registered and that it is later called when vpiPostSim takes place.
>>
>>
>>
>>
>>
>>
>>
>