How to solve the Cocoapods CDN Error error when executing pod update or pod install.

   |   1 minute read
When executing pod update or pod install with Cocoapods 1.8.5, the error message is as follows: Update all pods Updating local specs repositories [!] CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/ Response: 400 Solution: Follow the official documentation to add a source to the Podfile: # Uncomment the next line to define a global platform for your project source 'https://github.com/CocoaPods/Specs.git' platform :ios, '10.0'
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macOS Catalina 10.15 have not enough disk warning when install Xcode 11

   |   1 minute read
When updating Xcode, it may appear as if you have sufficient disk space, yet you still receive a not enough disk space warning. The most straightforward and effective solution is to free up space by deleting previous Xcode builds and unnecessary simulated devices. This can instantly free up several gigabytes of space. You can perform the following steps in Finder or Terminal to free up space: 1.Delete previous Xcode builds
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macOS Catalina 10.15 cannot be opened because the developer cannot be verified

   |   1 minute read
Due to the update of the permission system and the default system shell from bash to zsh in macOS Catalina 10.15, it was found that starting MongoDB from the command line was not working as before. After running the command, an error message was directly reported: “Developer cannot be verified”, as shown in the figure below: Solution: Open System Preferences and go to Security & Privacy, click on Allow Anyway
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How to solve the problem of high CPU usage and frequent disk overheating after upgrading to macOS Catalina 10.15?

   |   1 minute read
Today I upgraded my system to macOS Catalina 10.15 and found that the disk would heat up and the fan would start spinning loudly after using it for a while. Even if all applications were closed, this issue still occurred, and I suspected that the system was doing something in the background. I directly opened the system’s built-in Activity Monitor monitoring tool and found that a process called “photoanalysisd” was
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You can contact us with email: [email protected]

High concurrency in Web

   |   2 minute read
Have you ever wondered what kind of request volume or how many users a high-concurrency web application can support? An application that can only handle several hundred or several thousand PVs per day is not considered a high-concurrency system. However, there is no clear definition online as to what constitutes high concurrency. Note that the term concurrency here does not refer to concurrency in programming. For information on concurrency and
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Concurrency programming and Parallel programming

   |   1 minute read
Reference to the explanation of concurrency and parallelism by the father of Erlang using a picture that even a 5-year-old can understand: It may be more helpful to understand them from their opposite sides: The antonym of concurrency is sequential: concurrency vs sequential The antonym of parallelism is serial: parallelism vs serial Other explanations of concurrency and parallelism are: Concurrency: refers to the nature of the code that logically can
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