Comment by bluGill
21 hours ago
Good. As a C+++ programmer Rust has some things that intrigue me. However I have no desire to rewrite everything in rust and so interoperability has been what is holding me back.
We rewrote everything a few years back, completing in 2014 (Rust 1.0 came in 2015) - it costs nearly a billion dollars! I cannot in good conscience go back to management and ask for another billion dollars to rewrite again (Rust might be more productive, but inflation will eat that up, so I expect a rewrite to be more expensive). If Rust can work with my existing code though - I know of a number of small places where there is reason to rewrite anyway because the code is bad (or sometimes was good but not nicely flexible for the features we have added since).
What were you working on that cost a billion dollars to rewrite? Or was that hyperbole?
I'd say you only pay 10% of the cost when you finish/launch the re-written software. The other 90% of cost comes later in the format of operations, deprecation and migration, people both users and devs, community friction and learning cost.
And that 90% could be an underestimate here.
Real numbers. I can't say what directly, but you can make a good guess if you read my comment history. (I don't think this would be worth your time, but you could)
Based on Grok identifying the company correctly, that would amount to ~3% of annual revenue and 30% of profits which seems insane to me for the cost of a single project.
Anyway, even if that were true, rewrites are becoming drastically cheaper, simpler, and more correct with AI. The Bun rewrite is the largest experiment and seems to be 5-10x cheaper and completed ~100x faster and these costs are likely to come down further. So your claimed $1B rewrite today costs $100M and carries less risk. In 5 years it'll probably cost at most $10M and be finished drastically more quickly. And the vast majority of software doesn't cost $1B to translate.
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Btw grok found out in less than ten seconds what place you refer to and likely what software within that company.
Things that wouldn't be worth your time before are trivial these days with LLMs.
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