jsPerformance.pl is an adaptation by mazielobo@netscape.com of the JS Engine test driver (jsDriver.pl by rginda@netscape.com). Whereas jsDriver.pl runs qualitative tests with pass-fail output, jsPerformance.pl runs performance tests, with timing output. The driver outputs results files as peers to the test driver, and like jsDriver.pl, expects tests to be in a directory structure two levels deep. Additionally, jsPerformance.pl will post results to a server for logging purposes, if you have an appropriate CGI script to receive the results. The CGI script we used was http://jrgm.mcom.com/cgi-bin/jsperf/collect.cgi. This was adapted from John Morrison's loader.pl script (jrgm@netscape.com.). Note: the call to send_results_to_server() is currently commented out. If you have a CGI script and want to post results to it, uncomment it.