Startup Source Analysis of Broker in RocketMQ

In RocketMQ, using Broker Startup as a startup class is much more complex as the core of RocketMQ than starting NameServer. [Startup Source Analysis of NameServer in RocketMQ] The main function acts as the entry for its startup: 1 public static void main(String[] args) { 2 start(createBrokerController(args)); 3 } Broker's controller, Brok ...

Posted on Sat, 03 Aug 2019 18:49:09 -0400 by HAN!

[torch] pytorch hook learning

pytorch hook learning register_hook import torch x = torch.Tensor([0,1,2,3]).requires_grad_() y = torch.Tensor([4,5,6,7]).requires_grad_() w = torch.Tensor([1,2,3,4]).requires_grad_() z = x+y; o = w.matmul(z) # o = w(x+y) intermediate variable z o.backward() print(x.grad,y.grad,z.grad,w.grad,o.grad) Here, o and z are intermediate variables, not ...

Posted on Sat, 03 Aug 2019 15:47:44 -0400 by reapfyre

Dictionary (dict) addition, deletion and other methods

Catalog 1. Introduction to Dictionaries 2. Ways to add dictionary elements 3. Method of Deleting Dictionary Elements 4. Methods for modifying dictionary elements 5. Methods of querying dictionary elements 6. Traversing a dictionary by means of loops 1. Introduction to Diction ...

Posted on Sat, 03 Aug 2019 14:43:21 -0400 by metallord

[ZJOI2011] Rescue Piccacchu

Face https://www.luogu.org/problem/P4542 Immortal Title. Make minimum path overrides. A similar thing is that the minimum path coverage must cover every point, and so does the problem. There are four differences between this question and the minimum path coverage Repeatable access (this can be resolved with a $Floyed$delivery closure) E ...

Posted on Sat, 03 Aug 2019 13:50:35 -0400 by joeynovak

Learning about FFT analysis audio

This part of the knowledge is learned from the following articles: https://zhuanlan.zhihu.com/p/19763358 Knowledge of Fourier Transform https://www.cnblogs.com/RabbitHu/p/FFT.html Knowledge of FFT   Recently, I have been working on music games where I need to analyze audio to find rhythm points (or accents). After learning a seri ...

Posted on Sat, 03 Aug 2019 13:46:49 -0400 by Rederick

BeanFactory Architecture

BeanFactory is a very important class in Spring. If you understand it, you will know the initialization and destruction process of bean s, which is very helpful to understand IOC deeply. BeanFactory Architecture First, take a look at the inheritance hierarchy generated using IDEA (the inheritance graph of ApplicationContext is removed from the ...

Posted on Sat, 03 Aug 2019 10:43:09 -0400 by xbuzzx

"Twelve Provinces Joint Examination 2019" Leather Matching

Portal Solution  This is a knapsack counting problem, so we can understand it from the perspective of generating function. Each player can choose the camp(0/1\) and the faction(0/1\) If a city chooses the faction of (i) and (j) in the \) camp, it i s equivalent to the cost of (+s_i) for the faction and \) respectively. Let the generating fun ...

Posted on Sat, 03 Aug 2019 10:42:16 -0400 by gabriellevierneza

yum installation of Constos 7.x cloud server nginx+php7.2 +mongodb

nginx+php7.2 +mongodb Installation of NGINX II. Installation of php Installation of mongodb IV. Associating php with mongodb Installation of NGINX Execute orders: yum -y install gcc gcc-c++ autoconf pcre-devel make automake yum -y install wget httpd-tools vim Detection of nginx source in yum ...

Posted on Sat, 03 Aug 2019 09:58:06 -0400 by homerjay

Remote Call Code Encapsulation Chat

Last week, an online problem was handled. After investigation, it was found that the RPC remote call timed out, and the timeout exception thrown by the framework was not caught, causing the data to enter the intermediate state and unable to proceed with subsequent processing.Fortunately, it had little impact and was repaired in time. There was ...

Posted on Sat, 03 Aug 2019 00:46:47 -0400 by Randomizer

jdk1.8 LongAdder Difficulty Resolution

This article was written because jdk1.8 concurrentHashMap used this class before calculating capacity expansion, so it was studied later. This article mainly has several points: Why the LongAdder class is needed Analysis of LongAdder Implementation Principle Why the LongAdder class is needed Look at AtomicLong (1.5) before you look at this.Th ...

Posted on Fri, 02 Aug 2019 23:42:51 -0400 by opalelement