From: Stephen Anderson <stephen@...>
Date: 2008-05-08T09:10:49+09:00
Subject: Re: Is rcov stable? (was Re: rcov segmentation faults

Phillip Gawlowski wrote:
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> A: Because it makes it difficult to follow the conversation.
> Q: Why is top posting bad?
Thanks for the pointer, and thank you for taking the time to respond.


> What do RCov's tests say? Do they segfault, too?
Good point.  I'm trying to run them, but am encountering problems.
First I was hitting "WIN32 has been removed, use CURRENT instead".
Now I'm running into missing the 
/Library/Ruby/Gems/1.8/gems/rcov-0.8.1.2.0/test/expected_coverage 
directory.

Is it common for gems installed with "sudo gem install <gem name>" to 
not be installed in a way that allows running their tests?  Am I 
overlooking something?

> Have you tried a simple app, with only a handful of tests, that doesn't
> use Rails?
> 
> Are the slices virtual machines? Are you sure that the VM engine used
> (Xen, Virtuozzo, whatever) doesn't introduce artifacts that result in
> segfaults?
The slices use Xen.  This is a good point.  I'm also wondering about the 
rather low memory on the slices.

> Are you aware that RCov only runs your tests and shows you,
> approximately, which parts of the code get exercised by your tests?
This is what confuses and concerns me.  I have yet to see any of these 
errors when not running rcov.

> And shouldn't you run coverage on, say, development / build machines, as
> doing that in production is rather pointless?
Those slices aren't production.  I was hoping to keep a history of test 
results and test coverage visible from anywhere, and not limited to when 
a particular developer happens to be running their laptop.

> What version of RCov are you using? A 'gem install'ed one, or one
> installed via apt-get?
gem installed.  rcov 0.8.1.2 2007-11-22
I tried the apt-get installed rcov, and have tried the previous version, 
both apt-get installed, as well as gem installed.

> - --
> Phillip Gawlowski
> Twitter: twitter.com/cynicalryan
> Blog: http://justarubyist.blogspot.com
> 
> ~ - You know you've been hacking too long when...
> ...you count empty bottles (two at a time) like this:
> "2, 4, 8, 16, 32, .... 32?!?"
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