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https://en.wikipedia.org/wiki/Symmetric_multiprocessing
Symmetric multiprocessing (SMP) involves a multiprocessor computer hardware and software architecture where two or more identical processors are connected to a single, shared main memory, have full access to all input and output devices, and are controlled by a single operating system instance that treats all processors equally, reserving none for special purposes.
https://tldp.org/HOWTO/SMP-HOWTO-3.html
3. Questions related to any architectures. 3.1 Kernel Side. Does Linux support multi-threading? If I start two or more processes, will they be distributed among the available CPUs? Yes. Processes and kernel-threads are distributed among processors. User-space threads are not. What kind of architectures are supported in SMP? From Alan Cox:
https://volansys.com/portfolio/smp-for-linux-kernel/
In this project, we aimed at implementing Symmetric multiprocessing (SMP) support in Laptop Linux Kernel (version 3.5). That way, we would be functional in revolutionizing the purpose with which children utilize their laptops.
http://www.codeconfidence.com/doc/ecos/current/ref/kernel-smp.html
This is only available on selected architectures and platforms. The implementation has a number of restrictions on the kind of hardware supported. These are described in the Section called SMP Support in Chapter 4. The following sections describe the changes that have been made to the eCos kernel to support SMP operation.
https://doc.ecoscentric.com/ref/kernel-smp.html
The following sections describe the changes that have been made to the eCos kernel to support SMP operation. System Startup. The system startup sequence needs to be somewhat different on an SMP system, although this is largely transparent to application code. The main startup takes place on only one CPU, called the primary CPU.
https://www.centos.org/forums/viewtopic.php?t=12053
Sep 11, 2008 · Is there a simple way to add SMP support to my Centos 5.2 installation? I'm running 2.6.18-92.1.10.el5 I have an Intel Pentium E2180 dual core CPU.
https://stackoverflow.com/questions/20852902/how-to-check-whether-smp-is-enabled-or-disabled-in-the-kernel
I was wondering how can I check on my running machine, whether the kernel is configured for SMP or not? Of course, I can look into the kernel .config file and can search for it. But, the question is let's say I don't have a source code, how will I check the SMP configuration?
https://www.linuxtopia.org/online_books/linux_kernel/kernel_configuration/re146.html
This enables support for systems with more than one CPU. If you have a system with only one CPU, like most personal computers, say no. If you have a system with more than one CPU, say yes. If you say no here, the kernel will run on single and multiprocessor machines, but will use only one CPU of a multiprocessor machine.
https://www.kernel.org/doc/html/v4.11/core-api/cpu_hotplug.html
Such advances require CPUs available to a kernel to be removed either for provisioning reasons, or for RAS purposes to keep an offending CPU off system execution path. Hence the need for CPU hotplug support in the Linux kernel. A more novel use of CPU-hotplug support is its use today in suspend resume support for SMP.
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