multiprocessor

When should & shouldn't I use this C# utility class to control threads via Interlocked

由 妖精的绣舞 提交于 2020-01-13 16:29:10
问题 I'm trying to understand the logic behind how this class was written, and when I should and shouldn't use it. Any insight would be appreciated internal struct SpinLock { private volatile int lockHeld; private readonly static int processorCount; public bool IsHeld { get { return this.lockHeld != 0; } } static SpinLock() { SpinLock.processorCount = Environment.ProcessorCount; } public void Enter() { if (Interlocked.CompareExchange(ref this.lockHeld, 1, 0) != 0) { this.EnterSpin(); } } private

“Work stealing” vs. “Work shrugging”?

由 谁说我不能喝 提交于 2019-12-20 12:02:57
问题 Why is it that I can find lots of information on "work stealing" and nothing on "work shrugging" as a dynamic load-balancing strategy? By "work-shrugging" I mean pushing surplus work away from busy processors onto less loaded neighbours, rather than have idle processors pulling work from busy neighbours ("work-stealing"). I think the general scalability should be the same for both strategies. However I believe that it is much more efficient, in terms of latency & power consumption, to wake an

“Work stealing” vs. “Work shrugging”?

由 ☆樱花仙子☆ 提交于 2019-12-20 12:00:31
问题 Why is it that I can find lots of information on "work stealing" and nothing on "work shrugging" as a dynamic load-balancing strategy? By "work-shrugging" I mean pushing surplus work away from busy processors onto less loaded neighbours, rather than have idle processors pulling work from busy neighbours ("work-stealing"). I think the general scalability should be the same for both strategies. However I believe that it is much more efficient, in terms of latency & power consumption, to wake an

Sending data (BytesIO buffer) through a Pipe works but causes a Fatal Python exception

由 给你一囗甜甜゛ 提交于 2019-12-11 14:49:01
问题 Using Python 2.7 on Windows, the following code works but causes a problem with msvc. import io import matplotlib.pyplot as plt import matplotlib.pyplot as plt2 from multiprocessing import Process, Pipe def tmpPlot(conn): plt.plot([1,2,4,2]) plt.title("title") buf = io.BytesIO() plt.savefig(buf, format='png') buf.seek(0) conn.send(plt.imread(buf)) conn.close if __name__ == '__main__': parent_conn, child_conn = Pipe() p = Process(target=tmpPlot, args=(child_conn,)) p.start() imgData = parent

Force C# application to use a single core in a PC with a multicore processor

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-05 23:53:39
问题 Hi guys this question might seem weird, but I'm using the Haptek People Putty player for my C# application and I've seen people say in the forums that it doesn't work well with a multicore processor. My application runs well on my Core 2 Duo laptop but it lags a lot when I try running it on a Quad Core desktop. I was thinking of investigating this for myself and in that case, I would have to force my application to run on a single core. Is that possible in C#? Thanks! 回答1: Where a Process

When should & shouldn't I use this C# utility class to control threads via Interlocked

由 你离开我真会死。 提交于 2019-12-05 18:28:49
I'm trying to understand the logic behind how this class was written, and when I should and shouldn't use it. Any insight would be appreciated internal struct SpinLock { private volatile int lockHeld; private readonly static int processorCount; public bool IsHeld { get { return this.lockHeld != 0; } } static SpinLock() { SpinLock.processorCount = Environment.ProcessorCount; } public void Enter() { if (Interlocked.CompareExchange(ref this.lockHeld, 1, 0) != 0) { this.EnterSpin(); } } private void EnterSpin() { int num = 0; while (this.lockHeld != null || Interlocked.CompareExchange(ref this

Best Practice for Stopwatch in multi processors machine?

由 帅比萌擦擦* 提交于 2019-12-04 11:11:42
问题 I found a good question for measuring function performance, and the answers recommend to use Stopwatch as follows Stopwatch sw = new Stopwatch(); sw.Start(); //DoWork sw.Stop(); //take sw.Elapsed But is this valid if you are running under multi processors machine? the thread can be switched to another processor, can it? Also the same thing should be in Enviroment.TickCount. If the answer is yes should I wrap my code inside BeginThreadAffinity as follows Thread.BeginThreadAffinity(); Stopwatch

Best Practice for Stopwatch in multi processors machine?

由 耗尽温柔 提交于 2019-12-03 07:54:19
I found a good question for measuring function performance, and the answers recommend to use Stopwatch as follows Stopwatch sw = new Stopwatch(); sw.Start(); //DoWork sw.Stop(); //take sw.Elapsed But is this valid if you are running under multi processors machine? the thread can be switched to another processor, can it? Also the same thing should be in Enviroment.TickCount. If the answer is yes should I wrap my code inside BeginThreadAffinity as follows Thread.BeginThreadAffinity(); Stopwatch sw = new Stopwatch(); sw.Start(); //DoWork sw.Stop(); //take sw.Elapsed Thread.EndThreadAffinity(); P

“Work stealing” vs. “Work shrugging”?

由 ◇◆丶佛笑我妖孽 提交于 2019-12-03 03:07:53
Why is it that I can find lots of information on "work stealing" and nothing on "work shrugging" as a dynamic load-balancing strategy? By "work-shrugging" I mean pushing surplus work away from busy processors onto less loaded neighbours, rather than have idle processors pulling work from busy neighbours ("work-stealing"). I think the general scalability should be the same for both strategies. However I believe that it is much more efficient, in terms of latency & power consumption, to wake an idle processor when there is definitely work for it to do, rather than having all idle processors

Parallel coding Vs Multithreading (on single cpu)

由 拈花ヽ惹草 提交于 2019-11-30 07:16:10
can we use interchangeably "Parallel coding" and "Multithreading coding " on single cpu? i am not much experience in both, but i want to shift my coding style to any one of the above. As i found now a days many single thred application are obsolete, which would be better for future software industy as a career prospect? There is definitely overlap between multithreading and parallel coding/computing, with the main differences in the target processing architecture. Multithreading has been used to exploit the benefits of concurrency within a single process on a single CPU with shared memory.
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