Performance reduces as time goes on and area of circle is computed several times

[mayil-ai[bot]]

Some past issues to consider:

• Performance reduces as time goes on and area of circle is computed several times | Similar performance degradation issue with circle area computation.

• Issues with performance | Describes performance degradation over successive runs.

Here are some code snippets that may help you get started:

• circle.cpp:1-22 | The snippet shows dynamic allocation of 'radius', which needs to be replaced with a local variable to prevent memory leaks. It also lacks caching, which is crucial for performance optimization.

To address the performance degradation in circle.cpp, follow these actionable steps:

• Remove Dynamic Allocation of radius:

  • Use a local variable for radius instead of dynamic allocation to prevent memory leaks.

• Implement Caching for Calculations:

  • Use a static unordered_map to cache and retrieve previously calculated circle areas, optimizing repeated calculations.

Here's the updated code:

#include <iostream>
#include <cmath>
#include <unordered_map>
#include "shapes.h"

// Function to calculate the area of a circle
double areaCircle(double radius) {
    return M_PI * radius * radius;
}

int main(int argc, char *argv[]) {
    if (argc != 2) {
        std::cerr << "Usage: " << argv[0] << " <radius>\n";
        return 1;
    }

    static std::unordered_map<double, double> cache;
    double radius = std::atof(argv[1]);

    // Check if the area for this radius is already cached
    if (cache.find(radius) == cache.end()) {
        cache[radius] = areaCircle(radius);
    }

    // Output the cached or newly calculated area
    std::cout << "Area of the circle: " << cache[radius] << std::endl;

    return 0;
}

• Explanation:
  • The radius is now a local variable, eliminating the need for manual deallocation.
  • A static unordered_map is used to store and retrieve the area of circles, reducing redundant calculations.

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