Linked by Thom Holwerda on Tue 9th May 2006 21:25 UTC, submitted by luzr
OSNews, Generic OSes Torvalds has indeed chimed in on the micro vs. monolithic kernel debate. Going all 1992, he says: "The whole 'microkernels are simpler' argument is just bull, and it is clearly shown to be bull by the fact that whenever you compare the speed of development of a microkernel and a traditional kernel, the traditional kernel wins. The whole argument that microkernels are somehow 'more secure' or 'more stable' is also total crap. The fact that each individual piece is simple and secure does not make the aggregate either simple or secure. And the argument that you can 'just reload' a failed service and not take the whole system down is equally flawed." My take: While I am not qualified to reply to Linus, there is one thing I want to say: just because it is difficult to program, does not make it the worse design.
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RE[2]: Abstraction
by twenex on Tue 9th May 2006 22:46 UTC in reply to "RE: Abstraction"
twenex
Member since:
2006-04-21

only one major operating system thus far - QNX - has managed to pull it off without sacrificing efficiency

I daresay the Amiga microkernel-based OS was pretty efficient

Reply Parent Score: 5

RE[3]: Abstraction
by luzr on Tue 9th May 2006 22:54 in reply to "RE[2]: Abstraction"
luzr Member since:
2005-11-20

I daresay the Amiga microkernel-based OS was pretty efficient

I daresay that Amiga hardware was not capable of memory isolation, therefore could not have the real microkernel....

Edited 2006-05-09 22:55

Reply Parent Score: 5

RE[4]: Abstraction
by twenex on Tue 9th May 2006 23:07 in reply to "RE[3]: Abstraction"
twenex Member since:
2006-04-21

From http://en.wikipedia.org/wiki/AmigaOS

Technical Overview

The main modularisation technique in AmigaOS is based on dynamically-loaded shared libraries, either stored as a file on disk with a ".library" filename extension, or stored in the Kickstart ROM. All libraries are accessed via an indirect jump table, which is always stored in RAM. That way, every library function can be patched or hooked at run-time, even if the library is stored in ROM.

The most important library in AmigaOS is exec.library, which is actually a microkernel as well as a library. As well as pre-emptive multi-tasking and access to other libraries, it provides high-level inter-process communication via message passing. (Other microkernels have had performance problems because of the need to copy messages between address spaces. Since the Amiga has only one address space, Exec message passing is quite efficient.)

Reply Parent Score: 3