Optimization Ideas

• How much overhead do we incur from parsing ConfigDefault.pm every time?
• How much overhead do we incur from climbing up the directory tree, looking for a project ackrc every time?
• Can we make use of d_type in readdir to eliminate calls to stat?
• Why does searching a single large file specified on the command line take so long?
• Test more things in timing script
  • Large files (with and without matches)
  • Context (-A, -B, -C)
  • --noignore-dir
• Move hot code sections into an optional XS module
• Move $opt->{...} accesses into global/module-level/dynamic variables
• Implement hot code in XS?
• Try on large codebases (android, linux kernel)
• How much overhead is incurred unpacking @_?
• Use blessed array references rather than hash references for objects?
• How expensive is local $opt_...? Can we eliminate some to our benefit?
• We might be able to eliminate method calls to filter in the case of inverted filters and singleton collections