(Operating Systems) Describe how locked linked lists work. Where are the locks for such lists required? What is the performance efficiency (or lack of efficiency) of these data structures?
Linked Lists--- • We can make effective spin locks – Correct – Work well under contention
List-Based Sets
public interface Set
{
public boolean add(Object x);
public boolean remove(Object x);
public boolean contains
List Entry
public class Entry {
public Object object;
public int key;
public Entry next;
}
use a lock :-
Lock (L)
local := counter
local++
counter := local
Unlock(L)
Lock Free Mean :--
• First try: “never using a lock”.
• Well, is this using a lock? (word is initially zero.)
while (!CAS(&word,0,1)) {}
local := counter
local++
counter := local
word := 0
Lock-Freedom
• Realistic (though difficult): Various lock-free data structures exist in the literature (stack, queue, hashing, skiplist, trees, etc.). • Advantages: Worst-case responsiveness, scalability, no deadlocks, no livelocks, added robustness to threads fail-stop. Lock-Freedom If you schedule enough steps across all threads, one of them will make progress. Linked List: Our First
PERFORM EFFIIENCY(or lack of efficiency) OF THESE DATA STRUCTURES:--
Algorithm Efficiency
Some algorithms are more efficient than others. We would prefer to chose an efficient algorithm, so it would be nice to have metrics for comparing algorithm efficiency.
The complexity of an algorithm is a function describing the efficiency of the algorithm in terms of the amount of data the algorithm must process. Usually there are natural units for the domain and range of this function. There are two main complexity measures of the efficiency of an algorithm:
For example, we might say "this algorithm takes n2 time," where n is the number of items in the input. Or we might say "this algorithm takes constant extra space," because the amount of extra memory needed doesn't vary with the number of items processed.
(Operating Systems) Describe how locked linked lists work. Where are the locks for such lists required? What is the performance efficiency (or lack of efficiency) of these data structures?
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