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How Intuit Manages 10 Million Lines of Code
CowboyRobot writes "Intuit launched QuickBooks in 1992, and it has grown into the best-selling retail software for small-business accounting worldwide. QuickBooks is available on multiple platforms with different feature sets (Pro, Premier, Enterprise), in specialized editions (accounting, contracting, etc.), is available on CD or via subscription, and is offered in localized versions for the U.S., Canada, and the U.K. How they manage so many builds is a case-study for large scale programming. 'The Windows version is about 80,000 source files, 10+ million lines of C++ code plus a little C# for the .NET parts. Plus help files, tax tables, files defining local accounting rules, tax and other government reporting forms, upgrade offers — a lot of files. Every customer gets the full version. Specific feature sets are turned on and off with the license key.' And the lessons are not just technical. 'One surprising lesson is that small teams work, even for very large codebases — especially, Burt says, in sustaining an entrepreneurial, creative culture.'"
n early 1982, the Lisa software team was trying to buckle down for the big push to ship the software within the next six months. Some of the managers decided that it would be a good idea to track the progress of each individual engineer in terms of the amount of code that they wrote from week to week. They devised a form that each engineer was required to submit every Friday, which included a field for the number of lines of code that were written that week.
Bill Atkinson, the author of Quickdraw and the main user interface designer, who was by far the most important Lisa implementor, thought that lines of code was a silly measure of software productivity. He thought his goal was to write as small and fast a program as possible, and that the lines of code metric only encouraged writing sloppy, bloated, broken code.
He recently was working on optimizing Quickdraw's region calculation machinery, and had completely rewritten the region engine using a simpler, more general algorithm which, after some tweaking, made region operations almost six times faster. As a by-product, the rewrite also saved around 2,000 lines of code.
He was just putting the finishing touches on the optimization when it was time to fill out the management form for the first time. When he got to the lines of code part, he thought about it for a second, and then wrote in the number: -2000.
I'm not sure how the managers reacted to that, but I do know that after a couple more weeks, they stopped asking Bill to fill out the form, and he gladly complied.
http://folklore.org/StoryView.py?story=Negative_2000_Lines_Of_Code.txt
point is, just cause you can manage it, doesnt mean 10,000,000 lines of code is really something to brag about, especially for something that feels as cheap as quickbooks (though it does a ok job if your accountant cant use excel and must have things that visually represent checks)
If it takes 20 million lines of code to do ones taxes there is simply something very wrong with the process.
Got Code?
Quicken and Quickbooks is the only application I know of to have survived a full-on Microsoft assault on their business. Microsoft Money has folded. It's something to be proud of, I guess - for now.
Help stamp out iliturcy.
Just as a curiosity, why do you have a single file of more than 30K lines? Isn't that way over the top?
Not if the entire program is one enormous switch statement in the main() function.
Sage Peachtree is the main competitor in the self hosted small business accounting realm. To be honest if my dad wasn't so opposed to a hosted solution I would have had him go that way as even with 5 users the cost difference once you add up the server and licenses wasn't that great over five years.
As far as QB goes, it seems to finally be ok. Up until 2007 it still couldn't run as a limited rights user and required short printer names both of which caused me serious pain as I was the IT department for a midsized accounting firm and getting QB running in Citrix was NOT fun. We had premier enterprise support and their answer to the LRU issue was to grant Everyone full rights to HK_Classes_Root (NOT a good idea). I eventually figured out what keys the user needed access to and published the solution online to help others but their spaghetti code was so bad even then that nobody could actually tell what it was doing to give me the right answer.
There are 4 boxes to use in the defense of liberty: soap, ballot, jury, ammo. Use in that order. Starting now.
People who own Macs don't understand technical geeky things like numbers and are way too cool for accounting.
If you aren't part of the solution, then there is good money to be made prolonging the problem
People who own Macs don't understand technical geeky things like numbers and are way too cool for accounting.
Considering we overpay for everything and buy new iShinies every 3-6 months, I'd say keeping track of our finances is even more important for us than for you bottom feeding 99%ers and your 'PCs'.
Jesus was all right but his disciples were thick and ordinary. -John Lennon
Does that mean Apple owes its existence to Microsoft?
I just felt a great disturbance in the Apple fandom, as if millions of fanboys suddenly cried out in terror and were suddenly silenced.