Tag：Multithreading
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Time：2020-4-23
Key code first: i = tf.train.range_input_producer(NUM_EXPOCHES, num_epochs=1, shuffle=False).dequeue() inputs = tf.slice(array, [i * BATCH_SIZE], [BATCH_SIZE]) Principle analysis: The first line will generate a queue. The queue contains elements from 0 to num Expressions-1. If num epics is specified, each element will only generate num epics times. Otherwise, the loop will be generated. […]
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Time：2020-3-22
Visibility of multithreading The modification of shared variable value by one thread can be seen by other threads in time. Shared variables If a variable has copies in the working memory of multiple threads, then this variable is the shared variable of these threads. Java Memory Model JMM (JAVA memory model, referred to as JMM) […]
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Time：2020-3-5
Abstract:The research and development team of maxcompute, Alibaba’s unified big data computing platform, has gone through more than one year’s research and development, broken the boundaries of big data and scientific computing, completed the first version and opened it to the public. Mars, a unified distributed computing framework based on tensor. Using Mars for scientific […]
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Time：2020-2-17
Preface: When encountering a large number of data imports, in order to improve the processing speed, you can choose to use multithreading to batch process these processes. Common scenarios are: Large file import database (this file is not necessarily a standard CSV importable file or needs to be processed in memory) Data synchronization (pull data […]
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Time：2020-2-12
Detailed explanation and simple example of multithreading in Linux 1. concept Process: a running program. Thread: multiple execution paths in a program. A more accurate definition is that a thread is a control sequence within a process. 2. Why do we have threads? It’s too expensive to call a process with fork. You need to […]
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Time：2020-1-29
As follows: # -*- coding: utf-8 -*- import sys from PyQt5.QtCore import QThread, pyqtSignal from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QMessageBox, \ QPushButton, QLineEdit, QLabel, QToolTip, QComboBox, QTextEdit class MyBeautifulClass(QMainWindow): def __init__(self): super(MyBeautifulClass, self).__init__() self.init_ui() def init_ui(self): self.resize(1000, 800) self.setWindowTitle(‘Demo of PyQt5 QThread’) self.btn_1 = QPushButton(‘start’, self) self.btn_1.setGeometry(100, 100, 100, 50) self.btn_1.clicked.connect(self.slot_btn_1) self.linEdit_2 = QLineEdit(self) […]
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Time：2020-1-23
I remember when I first contacted with multi process and multi thread, I didn’t understand why there were multi threads? What the hell is multithreading? I can run a program well. Why use multithreading? Anyway, I am very puzzled. Even after a long time, I still don’t understand it very well. I have tried to […]
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Time：2020-1-22
1. Basic parameters of thread pool Take executors. Newfixedthreadpool() as an example: Imagine, if you create a thread pool, what parameters do you think the pool has? First of all, the pool must have a maximum number of threads. Then, we hope that there is a warning line for the number of threads in the […]
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Time：2020-1-14
On the basis of the above, this paper re implements the multi-threaded server. The following is the program code of the TCP client: #!/usr/bin/env python3 import sys from PyQt5.QtCore import (QByteArray, QDataStream, QDate, QIODevice, QRegExp, Qt) from PyQt5.QtWidgets import (QApplication, QDateEdit, QFrame, QGridLayout, QHBoxLayout, QLabel, QLineEdit, QPushButton, QWidget) from PyQt5.QtGui import QRegExpValidator from PyQt5.QtNetwork import […]
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Time：2019-12-20
Processes and threads First of all, processes and threads are commonly referred to as system kernel level concepts. process(process), intuitively speaking, is a running program, which is the smallest unit for system resource allocation. That is to say, the system allocates resources such as virtual address space to each process. By default, resources such as […]
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Time：2019-12-20
There is no multithreading in JavaScript. It can only do one thing at a time, and do the next thing after finishing one thing. If your JS takes a long time to do one thing, then the browser will be stuck for a period of time and will not respond to the user’s operation. What […]
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Time：2019-12-8
In general, there are four schemes for using multithreading on the IOS platform: Pthreads interface based on C language, which is the thread standard of POSIX, is implemented on Linux / Unix / Windows platform. C language is widely used in programming, but less used in IOS development. The exposed interface is relatively low-level and […]
