Taking core dumps, heap dumps and traffic dumps are very powerful ways for debugging. The most powerful tool I have seen lately is rr, the replaying debugger fr

Taking core dumps, heap dumps and traffic dumps are very powerful ways for debugging. The most powerful tool I have seen lately is rr, the replaying debugger from Mozilla. http://rr-project.org http://rr-project.org Personally I also like to extract data from logs with UNIX tools and feed them into csv/tsv files, then process them with R.