Linked by Hadrien Grasland on Sat 5th Feb 2011 10:59 UTC
OSNews, Generic OSes So you have taken the test and you think you are ready to get started with OS development? At this point, many OS-deving hobbyists are tempted to go looking for a simple step-by-step tutorial which would guide them into making a binary boot, do some text I/O, and other "simple" stuff. The implicit plan is more or less as follow: any time they'll think about something which in their opinion would be cool to implement, they'll implement it. Gradually, feature after feature, their OS would supposedly build up, slowly getting superior to anything out there. This is, in my opinion, not the best way to get somewhere (if getting somewhere is your goal). In this article, I'll try to explain why, and what you should be doing at this stage instead in my opinion.
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RE[9]: Not always rational
by Alfman on Thu 10th Feb 2011 05:20 UTC in reply to "RE[8]: Not always rational"
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"my response was aiming at the fact that there are many systems that do *not* use the traditional configuration. Hence shared memory is *not* the only possible form of IPC on such systems, and making the RAM a bottleneck through such IPC artificially limits system performance."

"As an example to emphasize my point, consider CPU/GPU combinations."

I expect the typical use case is the GPU caches bitmaps once, and doesn't need to transfer them across the bus again. So I agree this helps alleviate shared memory bottlenecks, but I'm unclear on how this could help OS IPC?

Maybe Nvidia's CUDA toolkit does something unique for IPC? That's not really my area.

I'm curious, what role do you think GPU's should have in OS development?

"I wouldn't be surprised to see high-end systems in the near future, powered by two general-purpose (multicore) CPUs and a GPU, each with its own RAM (that is, a total of 3 RAMs) and without transparent cache coherency between the CPUs, only between cores of the same CPU."

This sounds very much like NUMA architectures, and while support for them may be warranted, I don't know how this changes IPC? I could be wrong, but I'd still expect RAM access to be faster than any hardware on the PCI bus.

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