Memory leak with Cluster and ExpressJS
A memory leak is a type of software bug that occurs when a program or application fails to correctly release memory that it no longer needs. This can lead to a gradual decrease in the amount of available memory, which can eventually cause the program or system to slow down or crash.
Reasons for memory leaks can include:
- Failing to properly release memory that is no longer needed, such as when a program fails to deallocate memory that was dynamically allocated.
- Creating circular references between objects can prevent the garbage collector from properly cleaning up memory.
- Using too many global variables, which can consume a large amount of memory over time.
An example of a memory leak in a program would be a simple C++ program that dynamically allocates memory for an array of integers, but never deallocates that memory. Each time a new array is allocated the memory from the previous array is not released, thus gradually allocating more memory, eventually causing the program to crash.
To avoid memory leaks, programmers should:
- Be mindful of dynamically allocated memory and make sure to properly release it when it is no longer needed.
- Be careful to avoid creating circular references between objects.
- Minimize the use of global variables and use them only when necessary.
Steps to Install and Run Ember.js:
Step 1: Run the below command to install the Ember command-line interface:
npm install -g ember-cli
Step 2: Create a new Ember project using the command ember new my-project-name.
ember new <project-name>
Step 3: Navigate to the project directory using the command cd my-project-name.
Step 4: Run the development server using the command ember serve.
Note: You can also run the code on the node.js command prompt.
Example 1: Event emitters: If an event is emitted and there are no listeners for it, the event will be retained in memory and not garbage collected. This can lead to a memory leak if the event is emitted repeatedly.
Example 2: Unhandled promise rejections: If a promise is rejected but the rejection is not handled, it will continue to retain resources and cause a memory leak.
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