topic HTM/STM and Scheduling in Intel® Moderncode for Parallel Architectures

HTM/STM and Scheduling

Simone_A_ — Thu, 24 Apr 2014 01:25:45 GMT

Hi,

I have a question about Hardware and Software Transactional Memory.

Given the types of versioning (eager and lazy) and conflict detection (optimistic and pessimistic) and let's say that 2 or more threads are performing a transaction that write/read the same memory location.

The scheduling of the threads could affect the ability of detect a conflict? Which combination of versioning and conflict detection would be better to always catch the conflicts?

Hope my question is clear.

Thanks.
Best Regards,
Simone

A Pessimistic control and

Masood_Ali_M_ — Thu, 25 Sep 2014 14:16:49 GMT

A Pessimistic control and Eager versioning would do good. As on a successful committ, the Eager versioning transaction would be updated directly into the address would perform a undo operation which avoids the concurrency conflict as the locations are locked down.

and the Pessimistic control on transactions would provide a lock down on every place of location being involved in transaction closing a way for other users to change the logs.

Hope you found it useful.