items are allocated thread-locally now
optimized ah stack with better insert pointer update
implemented kind of an emptiness check
adjust scripts
adjust number of threads in the script
emptiness-check added to the ah_stack
new benchmarking scripts
.
added the shortest path benchmark to the general benchmark script and remove the old benchmark scripts
remove the unsound optimization
script changes
seqalt benchmark does not check for empty-dequeues anymore
added parameter to the seqalt benchmark so that it does not check for empty returns anymore