60% Of Windows Vista Code To Be Rewritten

Alien54 writes "Up to 60% of the code in the new consumer version of Microsoft new Vista operating system is set to be rewritten as the Company "scrambles" to fix internal problems, according to this report. In an effort to meet a deadline of the 2007 CES show in Las Vegas Microsoft has pulled programmers from the highly succesful Xbox team to help resolve many problems associated with entertainment and media centre functionality inside the OS. Much more at the link."

Comments

The reason it's problematic

[metamatic]

What you need to remember is that Windows is the largest software product ever created, when measured in lines of code. Bigger than the previous record holder, IBM's MVS. Bigger than the Star Wars missile shield defense software that nobody could ever get to work.

Specifically, Vista is 50 million lines of code (Mloc). See http://en.wikipedia.org/wiki/Source_lines_of_code

To compare, RedHat 7 was only 30 Mloc, including sendmail, Apache, and so on. So saying Microsoft are going to rewrite 60% of Vista by January, is like saying they could start now and have the whole of RedHat 7 completely rewritten by January.

Or to pick another data point: it's like saying Microsoft are going to start from scratch now, and write another Windows NT 5.0 by January, and have plenty of time for debugging--because NT 5.0 was only 20 Mloc.

Now do you see why software engineers reading the announcement are more than a little skeptical?

If it's really true that they need to rewrite 60% of Vista, then my professional opinion is that there's absolutely no way in hell they'll have something good enough to ship in 2007.

Even if it's out by a factor of 2 or 3, they're still in big trouble. The original Windows NT was only 4 Mloc, and there was a 5 year gap between Windows 95 and the actual release of NT.