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Notes -
Obsolete take.
Have you looked at a modern GC like ZGC? We're talking sub-millisecond pause times now. GC performance isn't a practical problem anymore. You're repeating obsolete 20 year old memes.
Ever use an Android phone? Plenty fast UI. Android is built on Java, and it has a GC. Works fine, even at pretty low levels of the framework stack.
I'm convinced we could push a modern GC to the kernel and it would work fine there too. (RCU is already a beast of complexity and nondeterministic timing and nobody complains about that.)
Please update your prejudices to reject the current state of technology.
Also look at the performance improvements that Microsoft announces with every new version of .NET. Where speed is absolutely critical, there is still usually no beating C/C++/Rust, but C# has become blazing fast compared to how it used to be, and is actually competitive with lower level languages in some cases.
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Gladly!
But more seriously, low latency isn't the whole picture. If I care about performance, why would I have so much spare CPU time laying around that I can essentially pin an entire core to be the GC manager?
God damned it. Something about this forum curses me with typos.
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