relaxed memory model
A memory model tells you, for a given processor or toolchain, We may also say it has a relaxed memory model. The venerable DEC Alpha is everybody’s favorite example of a weakly-ordered processor. There’s really no mainstream processor with weaker ordering.
Beyond Sequential Consistency: Relaxed Memory Models Arvind Based on the material prepared by Arvind and Krste Asanovic. 2 Beyond Sequential Consistency: Relaxed Memory Models. 6.823 L20- 3 Arvind Sequential Consistency Processor 1 Processor 2 Sparc’s TSO memory model Initially, all memory locations contain zeros November 21, 2005 .
CompCertTSO is a compiler that generates x86 assembly code from ClightTSO, a large subset of the C programming language enhanced with concurrency primitives for thread management and synchronisation, and with a TSO relaxed memory model.
A Tutorial Introduction to the ARM and POWER Relaxed Memory Models Luc Maranget INRIA Susmit Sarkar University of Cambridge Peter Sewell University of Cambridge (TSO) model [Spa92, OSS09, SSO+10] that we recall below. ARM and POWER are much weaker than TSO (though
That default can hurt performance, but the library’s atomic operations can be given an additional std::memory_order argument to specify the exact constraints, beyond atomicity, that the compiler and processor must enforce for that operation. Contents. 1 Constants; Even with relaxed memory model,
Testing Concurrent Programs on Relaxed Memory Models Jacob Burnim Koushik Sen Christos Stergiou Such code must run correctly despite the relaxed memory model of the underlying compiler, virtual machine, and/or hardware. These In order to control the underlying memory model, the second
Lecture 12: Relaxed Consistency Models Relaxed Memory Models • Recall that sequential consistency has two requirements: program order and write atomicity • Different consistency models can be defined by relaxing some of the above constraints this can improve • An example of a model that relaxes all of the above constraints (except
Model-check program and record trace of sequential consistent execution Iterate over trace and simulate relaxed memory model thread local buffers and memory Delay a commit as long as possible Before each event check if a pending store could be committed after the event. If the event happens-after the store, report SC violation
relaxed memory model of the underlying hardware  . These errors are hard to ﬁnd and debug as they most often show up only in speciﬁc thread interleavings and in particular hardware conﬁgurations. On the other hand, low-lock code is
Cited by: 105
Memory ordering describes the order of accesses to computer memory by a CPU. SPARC RMO = relaxed-memory order (not supported on recent CPUs) SPARC PSO = partial store order (not supported on recent CPUs) Memory model (programming) Memory barrier; References
Compile-time memory ·
Thread-Modular Static Analysis for Relaxed Memory Models Markus Kusano Virginia Tech Blacksburg, VA, USA memory-model specific: it models memory operations assuming a Thread-Modular Static Analysis for Relaxed Memory Models ESEC/FSE’17, September 4-8, 2017, Paderborn, Germany