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Hello,



An advantage of shared memory model is that memory communication is faster as compared to the message passing model on the same machine.


Read the following to notice it:


Why did Windows NT move away from the microkernel? 

"The main reason that Windows NT became a hybrid kernel is speed. A microkernel-based system puts only the bare minimum system components in the kernel and runs the rest of them as user mode processes, known as servers. A form of inter-process communication (IPC), usually message passing, is used for communication between servers and the kernel.

Microkernel-based systems are more stable than others; if a server crashes, it can be restarted without affecting the entire system, which couldn't be done if every system component was part of the kernel. However, because of the overhead incurred by IPC and context-switching, microkernels are slower than traditional kernels. Due to the performance costs of a microkernel, Microsoft decided to keep the structure of a microkernel, but run the system components in kernel space. Starting in Windows Vista, some drivers are also run in user mode."




Thank you,
Amine Moulay Ramdane.

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Read again.. aminer68@gmail.com - 2019-08-14 10:35 -0700

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