multiprocessor

Parallel coding Vs Multithreading (on single cpu)

由 妖精的绣舞 提交于 2019-11-29 09:14:52
问题 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? 回答1: There is definitely overlap between multithreading and parallel coding/computing, with the main differences in the target processing architecture. Multithreading has been

What happens if two process in different processors try to acquire the lock at EXACTLY same time

由 戏子无情 提交于 2019-11-28 18:55:20
Ok, so I am reading about synchronization, and I read through various algorithms such as spinlocks, semaphores, and mutex to avoid race condition. However, these algorithms can't prevent race condition in SMP when multiple proceses access the data exactly at the same time. For example, suppose thread 1 in processor A runs lock(mutex1); withdraw(1000); unlock(mutex1); and thread 2 in processor B runs lock(mutex1); deposit(1000); deposit(1000); unlock(mutex1); When both threads run EXACTLY AT THE SAME TIME, both threads will be in critical section simultaneously. The only solution (should be in

What happens if two process in different processors try to acquire the lock at EXACTLY same time

由 我们两清 提交于 2019-11-27 11:20:34
问题 Ok, so I am reading about synchronization, and I read through various algorithms such as spinlocks, semaphores, and mutex to avoid race condition. However, these algorithms can't prevent race condition in SMP when multiple proceses access the data exactly at the same time. For example, suppose thread 1 in processor A runs lock(mutex1); withdraw(1000); unlock(mutex1); and thread 2 in processor B runs lock(mutex1); deposit(1000); deposit(1000); unlock(mutex1); When both threads run EXACTLY AT

Gradle android build for different processor architectures

由 守給你的承諾、 提交于 2019-11-27 06:58:33
I want to build 4 separate apks for 4 different Android CPU processor architectures (armeabi armeabi-v7a x86 mips) using Gradle. I have native OpenCV libraries built for 4 CPU architectures in the libs folder. libs -armeabi -armeabi-v7a -x86 -mips I want to each apk only contains the OpenCV library corresponding to the correct CPU architecture. The current build script is as below: apply plugin: 'android' dependencies { compile fileTree(dir: 'libs', include: '*.jar') compile project(':workspace:OpenCV4Android:sdk:java') } android { compileSdkVersion 11 buildToolsVersion "18.1.0" sourceSets {

Gradle android build for different processor architectures

由 不想你离开。 提交于 2019-11-26 17:36:16
问题 I want to build 4 separate apks for 4 different Android CPU processor architectures (armeabi armeabi-v7a x86 mips) using Gradle. I have native OpenCV libraries built for 4 CPU architectures in the libs folder. libs -armeabi -armeabi-v7a -x86 -mips I want to each apk only contains the OpenCV library corresponding to the correct CPU architecture. The current build script is as below: apply plugin: 'android' dependencies { compile fileTree(dir: 'libs', include: '*.jar') compile project('

Stop reading process output in Python without hang?

由 孤者浪人 提交于 2019-11-26 00:18:22
问题 I have a Python program for Linux almost looks like this one : import os import time process = os.popen(\"top\").readlines() time.sleep(1) os.popen(\"killall top\") print process the program hangs in this line : process = os.popen(\"top\").readlines() and that happens in the tools that keep update outputting like \"Top\" my best trials : import os import time import subprocess process = subprocess.Popen(\'top\') time.sleep(2) os.popen(\"killall top\") print process it worked better than the
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