Performance profiling is done to check which part of the design is taking maximum time. Can anyone please describe how the following percentages(In%, Under%) can be related to the simulation time?
The following table is the calltree report generated after profiling.
In(%) is the amount of the overall simulation time spent on that particular line
Under(%) is the total time spent on that line and anything that gets called from that line
I noticed that the entries in the calltree report you show above do not contain line numbers. In some cases the ability to associate simulation activity with a particular source line is lost during particular optimizations. Please try re-running your test with +acc=l added to your vopt optimization command. This will tell the optimization engine to attempt to preserve line number information. In most cases this will have only a slight impact on the overall performance of the design so the profile information will still be valid.
Thanks, I could make sense of the report a little with your explanation.
The example I provided doesn’t have any line numbers, as that file is a package and has the files that need to be included.
In the profiling report, there is a field which shows up as “vl_systf_calltf”. Can you explain what this field means?
The report shows that the package and this command take up most of the time.
That looks like an internal call in simulator you are using.
I would suggest talking to the local support representative for your simulator vendor, they can help understand what is happening in this case.