Disadvantages of Transactional memory

[Horizon68]

Hello..


Read the following paper about the disadvantages of Transactional memory:


"Hardware-only (HTM) suffers from two major impediments:
high implementation and verification costs lead to design
risks too large to justify on a niche programming model;
hardware capacity constraints lead to significant performance
degradation when overflow occurs, and proposals for managing overflows
(for example, signatures ) incur false positives that add
complexity to the programming model.

Therefore, from an industrial perspective, HTM designs have to provide
more benefits for the cost, on a more diverse set of workloads (with
varying transactional characteristics) for hardware designers to
consider implementation."

etc.

"We observed that the TM programming model itself, whether implemented
in hardware or software, introduces complexities that limit the expected
productivity gains, thus reducing the current incentive for migration to
transactional programming, and the justification at present for anything
more than a small amount of hardware support."


Read more here:

http://pages.cs.wisc.edu/~cain/pubs/cascaval_cacm08.pdf



Thank you,
Amine Moulay Ramdane.