54,56c54,59
< # Redirect config output to cout so that gets diffed too (in case
< # that's the source of the problem).
< $simargs .= " --root:config_output_file=cout";
---
> # Run individual invocations in separate dirs so output and intermediate
> # files (particularly config.py and config.ini) don't conflict.
> $dir1 = "tracediff-$$-1";
> $dir2 = "tracediff-$$-2";
> mkdir($dir1) or die "Can't create dir $dir1\n";
> mkdir($dir2) or die "Can't create dir $dir2\n";
58,59c61,62
< $cmd1 = "$sim1 $simargs --stats:text_file=tracediff-$$-1.stats 2>&1 |";
< $cmd2 = "$sim2 $simargs --stats:text_file=tracediff-$$-2.stats 2>&1 |";
---
> $cmd1 = "$sim1 $simargs -d $dir1 2>&1 |";
> $cmd2 = "$sim2 $simargs -d $dir2 2>&1 |";