Paper by Erik D. Demaine
- Gerth Stølting Brodal, Erik D. Demaine, and J. Ian Munro, “Fast Allocation and Deallocation with an Improved Buddy System”, Acta Informatica, volume 41, number 4–5, March 2005, pages 273–291.
We propose several modifications to the binary buddy system for managing
dynamic allocation of memory blocks whose sizes are powers of two. The
standard buddy system allocates and deallocates blocks in
Θ(lg n) time in the worst case (and on an amortized basis),
where n is the size of the memory.
We present three schemes that improve the running time to O(1) time,
where the time bound for deallocation is amortized for the first two schemes.
The first scheme uses just one more word of memory than the standard
buddy system, but may result in greater fragmentation than necessary.
The second and third schemes have essentially the same
fragmentation as the standard buddy system, and use
O(2(1 + √lg n) lg lg n)
bits of auxiliary storage,
which is ω(lgk n) but
for all k ≥ 1 and ε > 0.
Finally, we present simulation results estimating the effect
of the excess fragmentation in the first scheme.
- This paper is also available from SpringerLink.
- The paper is 16 pages.
- The paper is available in PostScript (484k), gzipped PostScript (185k), and PDF (203k).
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- Related papers:
- Buddy_FSTTCS99 (Fast Allocation and Deallocation with an Improved Buddy System)
See also other papers by Erik Demaine.
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