How to adjust the thread pool size using Littler's rule

Littler's rule Ritter's Law derives from queuing theory and is expressed in the following mathematical formulas: L = λW Average number of requests present in the L system. The effective arrival rate for lambda requests.For example: 5/s means that five requests arrive at the system per second. Average wait time for a W request to execute in the ...

Posted on Tue, 26 May 2020 14:28:50 -0400 by MrBillybob

Ring Buffer

When we process network packets again, we may put the received network packets into the buffer for further processing. Here I have written a ring buffer in C++ according to my own needs, which is actually an array for simulation. The first header file,'RingBuffer.h', is as follows: #pragma once //The size of the buf ...

Posted on Tue, 26 May 2020 13:20:38 -0400 by SUNNY ARSLAN

Oracle learning - DQL syntax

Standard DQL syntax select distinct * | column name as alias, list 2 as alias 2... | aggregate function from table name as alias, table name 2 as alias 2 where query criteria group by group field having group condition order by sort field asc | desc 1. Query - single table query 1.1. Simple query exercise -- 1 Query the owner's record of ...

Posted on Tue, 26 May 2020 09:57:14 -0400 by tomprogers

Design pattern 2: don't know how to improve code reusability? Look at these design patterns!

This is the second article of design pattern. The first article is Don't know how to package code? Look at these design patterns! Later, there will be a design pattern to improve scalability and code quality. Pay attention to it and don't get lost, ha ha~ I think everyone has heard of the DRY principle. In fact, it is don't repeat yourself, wh ...

Posted on Tue, 26 May 2020 04:13:14 -0400 by biocyberman

. NET Core HttpClientFactory+Consul for service discovery

preface Last article . NET Core HttpClient+Consul to realize service discovery It has been mentioned that HttpClient has the problem of socket delay release, and the problem of server denial of service caused by port number exhaustion caused by high concurrency. Fortunately, Microsoft realized this problem and started to introduce HttpClientFa ...

Posted on Tue, 26 May 2020 01:03:44 -0400 by Johannes80

You robbed so many red envelopes. Do you know how it works?

With the popularity of electronic payment, red envelopes are very popular in social software such as wechat nails. Generally, the amount of red envelopes does not need to be very large, which can achieve the way to improve everyone's enthusiasm. In fact, robbing red envelopes is more of a pastime. It's a joy that can't be imagined. As our tra ...

Posted on Mon, 25 May 2020 23:16:21 -0400 by wee_eric

Spam classification 2

1. Read # 1. Read data set def read_dataset(): file_path = r'SMSSpamCollection' sms = open(file_path, encoding='utf-8') sms_data = [] sms_label = [] csv_reader = csv.reader(sms, delimiter='\t') for line in csv_reader: sms_label.append(line[0]) # Extract Tags sms_data.append(preprocessing(line[1]) ...

Posted on Mon, 25 May 2020 10:13:59 -0400 by Braet

Temperature prediction based on random forest

1, Weather maximum temperature prediction task Experimental data and source code https://github.com/wyn-365/temp-predict.git 1.1 tasks We have three tasks to accomplish: Using random forest algorithm to complete basic modeling tasks Basic tasks require us to process data, observe features, complete modeling and conduct visual display analysis ...

Posted on Sun, 24 May 2020 01:21:53 -0400 by jrschwartz

C++98/11/17 Expression Categories

target Can the following code be compiled and passed, and run as expected?(Click to expand)#include <utility> #include <type_traits> namespace cpp98 { struct A { }; A func() { return A(); } int main() { int i = 1; i = 2; // 3 = 4; const int j = 5; // j = 6; i = j; func() = A(); return 0; } } name ...

Posted on Sat, 23 May 2020 12:44:44 -0400 by luzlin

Download videos and save them to your mobile album

Function description: The transcoded video (less than 20MB) needs to be downloaded to the mobile phone album through APP to share the small video to WeChat. 1. Video is transcoded from the server, or many cloud providers will provide this functionality. 2. Download to mobile photo album via APP, this is what we need to do. Main Techniques: U ...

Posted on Sat, 23 May 2020 12:38:06 -0400 by sheilam