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Questions tagged [smp]

Symmetric multiprocessing

"Symmetric multiprocessing (SMP) involves a multiprocessor computer hardware architecture where two or more identical processors are connected to a single shared main memory and are controlled by a single OS instance. Most common multiprocessor systems today use an SMP architecture." [Source: Wikipedia.]

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Getting statistics from Strobe Media Playback using Javascript

I am attempting to get statistics data from a Strobe Media Playback flash player. I have looked at this example, however it uses swfobject.js and .embedSWF() to create the player. I create the player in HTML and attach a Javascript Bridge. From…
Knossos
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Is it possible for a child process created by fork() on Linux to run on a separate core in an SMP environment?

When calling fork(), what practices exist to ensure that the child process can run in parallel on a separate core?
Michael Labbé
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What is the expected overhead of a multi-process system compared to multi-threaded application?

For some operating systems (OpenBSD & ...) threads are userland-only and mostly exist for compatibility. Disregarding that type of implementation, how does the use of kernel-level threads compare to a multi-process design? What are the security…
user1066701
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Should ISR be re-entrant if I provide the same ISR to multiple interrupt lines?

In Linux, while an ISR is being executed for an interrupt line, I understand that Linux will disable the interrupt in all the processors and optionally (with IRQF_DISABLED set), it can also disable all the interrupts in the current processor. So,…
jake
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How to start secondary risc-v core in Renode emulator?

I'm using Renode to simulate a risc-v system which have multiple cores, and then run opensbi and Linux kernel on it. But the secondary core seems can't be brought up in Linux kernel. Here is the kernel log. 17:09:32.6490 [INFO] uart0: [host: …
Gavin
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What is the difference between processor cores and SMP cores?

In figure 3.2 in the book Distributed Systems: fun and profit, it is mentioned: Performance advantage of a cluster built with high-end server nodes (128 core SMP) over a cluster with the same number of processor cores built with low-end server…
Aviral Srivastava
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Searching for SMD IC Datasheet

I am looking for help to identify the chip in the photo attached. I tried google but no reuslt.
Hussam Mj
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Linux softirq and SMP

I have read that multiple instances of a softirq can be run on different cores in a multi-core system. Based on above statement, I have deduced below understanding with a example. The system received similar hardware interrupts on its local PIC of…
Naresh
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Send BLE raw packet through serial port

I was wondering if there is a way to have access through UART port to all BLE packets (all the packets that you can sniff using a sniffer and wireshark (LL, SMP, ATT, L2CAP protocols) with a BLE adapter or a nrf52 DK which is connected to a BLE…
Dev
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why does read barrier can causes all effects prior to storage from another cpu be perceptible?

Documentation about memory barriers of linux kernel(https://www.kernel.org/doc/Documentation/memory-barriers.txt) has this example to illustrate the read barrier in the SMP case can be used to causes all effects prior to storage from another cpu be…
AndrewHan
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Is memory reordering equivalent to instruction reordering?

I'm learning multi-thread programming. But I'm confused with some words that "memory reordering" and "instruction reordering". My question is that is "memory reordering" equivalent to "instruction reordering"? If not what's the difference between…
梁雨生
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UI Thread Bound AtomicInteger

I have been reading about SMPs machines(x86/ARM)and Compiler reordering for efficiency. Now I want to make a counter and the variable lives as a private member of ActivityLifecycleCallbacks implementation. The operations on this variable is…
Jai Pandit
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CPU1 failed to come online

Could someone explain why we get the message below in kernel in SMP environment? CPU1 failed to come online Source kernel_msm-4.9/kernel/arch/arm/kernel/smp.c: if (!cpu_online(cpu)) { pr_crit("CPU%u: failed to come online\n", cpu); ret =…
Harsh Agarwal
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QEMU/vExpress issue regarding SMP and U-boot

Since quite a long time, there is still an issue with QEMU/vExpress and U-boot using more than one CPU core (vExpress refers to a ARM Cortex-A15 CPU). Before digging into Qemu/U-boot code, has anybody investigated further about that ? (I'm ready to…
Daniel Rossier
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Should I enable SMP on heterogeneous multi-threaded CPU's?

I'm building the Linux kernel for a big.LITTLE board and I've been wondering about the CONFIG_SMP option, which enables the kernel's Symmetric-processing support. Linux's documentation says this should be enabled on Multi-Threaded processors, but I…
Ezequiel Barbosa
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