Restricted Transactional Memory (RTM)

Analyzing Intel® SDE's TSX-related log data for capacity aborts

Starting with version 7.12.0, Intel® SDE has Intel® TSX-related instruction and memory access logging features which can be useful for debugging Intel® TSX's capacity aborts. With the log data from the Intel SDE you can diagnose cache set population to determine if there is non-uniform cache set usage causing capacity overflows. A refined log data may be used to further diagnose the source of the aborts.

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    Transactional Memory Support: the speculative_spin_rw_mutex (Community Preview Feature)

    In a previous post I discussed the Intel® Transactional Synchronization Extensions (Intel® TSX) technology released in the new generation of processors.  I described the Intel® Threading Building Blocks (Intel® TBB) implementation of the HLE interface (speculative_spin_mutex).  Now we can talk about the implementation of speculative_spin_rtw_mutex, a Preview Feature of TBB 4.2 Update 2.

    Transactional memory support: the speculative_spin_mutex

    Intel recently released the 4th Generation Intel® Core™ processors, which have Intel® Transactional Synchronization Extensions (Intel® TSX) enabled.  Intel TSX can improve the performance of applications that use lock-based synchronization to protect data structure updates.  This feature allows multiple non-conflicting lock-protected changes to data to occur in parallel.

    Fun with Intel® Transactional Synchronization Extensions

    By now, many of you have heard of Intel® Transactional Synchronization Extensions (Intel® TSX). If you have not, I encourage you to check out this page ( before you read further. In a nutshell, Intel TSX provides transactional memory support in hardware, making the lives of developers who need to write synchronization codes for concurrent and parallel applications easier.

    Exploring Intel® Transactional Synchronization Extensions with Intel® Software Development Emulator

    Intel® Transactional Synchronization Extensions (Intel® TSX) is perhaps one of the most non-trivial extensions of instruction set architecture introduced in the 4th generation Intel® Core™ microarchitecture code name Haswell. Intel® TSX implements hardware support for a best-effort “transactional memory”, which is a simpler mechanism for scalable thread synchronization as opposed to inherently complex fine-grained locking or lock-free algorithms. The extensions have two interfaces: Hardware Lock Elision (HLE) and Restricted Transactional Memory (RTM). 

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