The current generation of software transactional memories has the
advantage of being simple and efficient. Nevertheless, there are sev-
eral parameters that affect the performance of a transactional mem-
ory, for example the locality of the application and the cache line
size of the processor. In this paper, we investigate dynamic tuning
mechanisms on a new time-based software transactional memory
implementation. We study in extensive measurements the perfor-
mance of our implementation and exhibit the benefits of dynamic
tuning. We compare our results with TL2, which is currently one
of the fastest word-based software transactional memories.