Original Redmine Comment
Author Name: Todd Strader (@toddstrader)
Original Date: 2019-10-22T22:01:48Z

See:
https://github.com/toddstrader/verilator-dev/tree/prot-lib-benchmark

This adds t_noprot_lib which is the same as t_prot_lib but without --protect-lib. These can be run against each other with or without tracing. For reference, on my system I see:

t_prot_lib.pl --notrace --benchmark 10000000
12.03user 0.00system 0:12.04elapsed 99%CPU (0avgtext+0avgdata 1056maxresident)k
t_noprot_lib.pl --notrace --benchmark 10000000
0.25user 0.00system 0:00.25elapsed 99%CPU (0avgtext+0avgdata 3184maxresident)k
t_prot_lib.pl --benchmark 100000
1.66user 0.50system 0:02.20elapsed 98%CPU (0avgtext+0avgdata 1212maxresident)k
t_noprot_lib.pl --benchmark 100000
0.39user 0.11system 0:00.50elapsed 99%CPU (0avgtext+0avgdata 3296maxresident)k

Note:

• The tests run with --trace by default so that they can grep the VCDs
• Tracing tests are run with smaller cycle counts because I can't wait that long
• --protect-lib performance is currently not great, but I don't think that's really a surprise

Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2019-10-22T22:26:16Z

Not sure if you are proposing to merge this...

1. Some tabs got into t_prot*, please squash them.

2. You shouldn override the sim_time check in driver as this may lead to infinite runtimes, instead put in the .pl file a big number:

   $Self->{sim_time} = 100000;

With those feel free to merge (if you want to).

Original Redmine Comment
Author Name: Todd Strader (@toddstrader)
Original Date: 2019-10-23T17:06:36Z

Yeah, sorry. The intent is to push this. I'm sure we'll want to evolve the benchmarking over time, but focusing on the I/O copy overhead (which is what this demonstrates) seems like a good place to start.

Re: tabs, they snuck in because I was using this for Verilog formatting:

emacs --batch <filenames.v> -f verilog-batch-indent

Squashed and pushed.

Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2019-11-10T19:30:05Z

In 4.022.

(& thanks for all your work in this release)