Memory Allocation Algorithms

Visualize different memory allocation strategies

Understanding Memory Allocation

Memory allocation is like managing a library's bookshelf space. Each process needs a specific amount of memory (like books needing shelf space), and our algorithms determine the best way to assign this space.

First Fit
Best Fit
Worst Fit
Next Fit
Weighted Best Fit
Size-Ordered First Fit

First Fit Algorithm

Think of First Fit as a librarian who starts from the beginning of the shelf and places books in the first available spot that's big enough.

"Like finding the first parking spot that fits your car, regardless of whether there might be a better spot further down."
  • Fastest algorithm to execute
  • Simple to implement
  • May lead to memory fragmentation

Best Fit Algorithm

Best Fit is like a meticulous librarian who searches the entire shelf to find the smallest possible space that can accommodate the new books.

"Similar to finding the smallest possible box that can fit your items, minimizing wasted space."
  • Minimizes wasted memory space
  • Creates smallest leftover holes
  • Requires searching entire memory

Worst Fit Algorithm

Worst Fit is like a librarian who deliberately chooses the largest available space, leaving bigger chunks for future allocations.

"Like choosing the largest available parking spot, leaving more flexible options for other cars."
  • Creates larger leftover spaces
  • Reduces external fragmentation
  • Requires searching entire memory

Next Fit Algorithm

Next Fit is like a librarian who remembers where they last placed books and starts searching from that point for the next allocation.

"Similar to a circular parking lot where you start looking from where you last parked."
  • Faster than Best and Worst Fit
  • More efficient than First Fit
  • Maintains a pointer to last allocation

Weighted Best Fit Algorithm

Weighted Best Fit considers multiple factors beyond just block size to make allocation decisions.

"Like a smart parking system that considers not just space size, but also location convenience and impact on overall parking flow."
  • Considers block location and fragmentation
  • Uses weighted scoring system
  • Balances multiple allocation factors

Size-Ordered First Fit Algorithm

Size-Ordered First Fit maintains blocks in order of increasing size for faster allocation decisions.

"Like organizing books by size on shelves, making it easier to find the right spot quickly."
  • Faster than standard Best Fit
  • Reduces search time
  • Maintains size-based ordering

Memory Allocation Simulation

Free Memory
Allocated Memory
Process
Block Number Block Size (KB) Process Number Process Size (KB)
5x

Process Sizes

Memory Blocks

Allocation Progress: 0% Time: 0s

Total Memory

0 KB

Allocated Memory

0 KB

Internal Fragmentation

0 KB

External Fragmentation

0 KB
Click an algorithm button to start allocation
Ready to simulate memory allocation

Memory Block Status

Block Size Allocated To Memory Status

Process Status

Process Size (KB) Status Allocated Block