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However, the CPU/ISA specific code in modern OS's is much smaller than a microkernel. As Tanenbaum described, modern OS kernels do abstract out the distinctions between CPU's & ISA's. Arguably, both Torvalds & Tanenbaum overestimated the portion of kernel design and implementation that now needs to be ISA or even CPU specific.
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The problem domains ISA's & CPU's target tend to be so broad that they mostly overlap, so for any software beyond a compiler, the size of porting exercises has also diminished. OS's can address larger and larger portions of the market per supported ISA/CPU, so there is little need (or even no need) for porting exercises to allow an OS ecosystem to thrive. The importance of economies of scale has made the benefits of a ISA/CPU targeting a larger (therefore broader) market outweighs the potential benefits from design choices which narrow the market for an ISA/CPU. ISA design, CPU design and CPU production facilities) have grown rapidly, thereby increasing the value of economies of scale with per unit CPU costs (in terms of "bang for the buck" & "bang for the watt") plummeting, the cost of a CPU needn't be amortized over such a broad selection of functions to provide value, so computing in products with fixed function has exploded CPU transistor budgets have grown exponentially, therefore wasting a fixed number of transistors due inefficiencies in ISA design is of no consequence. Fixed manufacturing costs which are amortized over CPU's (e.g. The biggest thing that was overlooked in this debate was the impact of CPU manufacturing technology and economics, driven by shrinking transistor sizes as expressed in Moore's Law (not surprising as though they knew a lot about CPU hardware, these guys studied and debated software, not CPU manufacturing or economics).
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or "Moore was right and they were both wrong" Software Experts Ignored the Economics Of Hardware I think the computer ecosystem is a lot more diverse than Tanenbaum foresaw, even when you restrict your view to desktop computers.
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There's probably some GNU system tools on Android phones).
![linux server os market share linux server os market share](https://img.informer.com/screenshots_mac/0/289_3.png)
Yet, there's a whole lot of GNU stuff out there (all Macs ship with GNU's Bash, for example. GNU isn't even necessarily the most important player in the Open Source community, so even a more widespread adoption of open source software didn't necessarily translate into GNU OSes. I think the various OS vendors still offer compelling value propositions on their OSes.
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(5 years from then) everyone will be running a free GNU OS Compare to one of the dominant RISC desktop chip makers, IBM, who could not get a power-efficient and high performance G5 for Apple laptops in a reasonable timeframe. Intel engineers did some amazing work to squeeze life out of their instruction set, even to the point of making a RISC core with an opcode translator that sits on top. So long as Windows is the dominant platform for desktop computers and Linux for servers, this is likely to continue to be true for a while. Only in the desktop and server space does x86 dominate. This year, a single ARM vendor (yeah, Apple) may outsell all x86 vendors combined. ARM (R stands for RISC) outsells x86 in number of processors, there are more ARM processors than x86 processors in use, and there is more total ARM computing capacity than x86 computing capacity. If you back up from desktops and servers, RISC dominates the processor market by any measure. x86 will die out and RISC architectures will dominate the market It's a bit of a stretch when you look at some textbook microkernels, but the claims had some technical justification. Microsoft sometimes used to claim that the Win32 kernel was a microkernel architecture. Certainly some lessons learned from microkernel research was applied to monolithic kernels. I think Linus hit the points on monolithic kernels in his debate.