Jenkins – TFS 2008/2010 vs Jenkins for Continuous Integration

Both are open source projects, but you do not need to change buildbot code to "extend" it, it is actually quite easy to import your own packages in its configuration in which you can sub-class most of the features with your own additions. Examples: your own compilation or test code, some parsing of outputs/errors to be given to the next steps, your own formating of alert emails etc. there are lots of possibilities.

Generally I would say that buildbot is the most "general purpose" automatic builds tools. Jenkins however might be the best related to running tests, especially for parsing and presenting results in nice ways (results, details, charts.. some clicks away), things that buildbot does not do "out-of-the-box". I'm actually thinking of using both to have sexier test result pages.. :-)

Also as a rule of thumb it should not be difficult to create a new tool's config: if the specification of what to do (configs, builds, tests) is too hard to switch from one tool to another, it is a (bad) sign that not enough configuration scripts are moved to the sources. Buildbot (or Jenkins) should only call simple commands. If it is simple to run tests, then developers will do it as well and this will improve the success rate, whereas if only the continuous integration system runs the tests, you will be running after it to fix the new code failures, and will loose its non-regression value, just my 0.02€ :-)

Hope it'll help.

You can not do an exact stddev and a median unless you either keep the whole thing in memory or run through the data twice.

UPDATE While you can not do an exact stddev IN ONE PASS, there's an approximation one-pass algorithm, the link is in a comment to this answer.

The rest are completely trivial (no need for a module) to do in 3-5 lines of Perl. STDDEV/Median can be done in 2 passes fairly trivially as well (I just rolled out a script that did exactly what you described, but for IP reasons I'm pretty sure I'm not allowed to post it as example for you, sorry)

Sample code:

my ($min, $max)
my $sum = 0;
my $count = 0;
while (<>) {
    chomp;
    my $current_value = $_; #assume input is 1 value/line for simplicity sake
    $sum += $current_value;
    $count++;
    $min = $current_value if (!defined $min || $min > $current_value);
    $max = $current_value if (!defined $max || $max < $current_value);
}
my $mean = $sum * 1.0 / $count;
my $sum_mean_diffs_2 = 0;

while (<>) { # Second pass to compute stddev (use for median too)
    chomp;
    my $current_value = $_; 
    $sum_mean_diffs += ($current_value - $mean) * ($current_value - $mean);
}
my $std_dev = sqrt($sum_mean_diffs / $count);
# Median is left as excercise for the reader.