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Exercises in Emulation: Xbox 360’s FMA Instruction

Randon ASCII

And, FMA instructions often have lower latency than a multiply followed by an add instruction. On the Xbox 360 CPU the latency and throughput of FMA was the same as for fmul or fadd so using an FMA instead of an fmul followed by a dependent fadd would halve the latency. Discussion on reddit/r/programming. Emulating FMA.

Games 48
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A persistent problem: managing pointers in NVM

The Morning Paper

On the last morning of the conference Daniel Bittman presented some of the work being done in the context of the Twizzler OS project to explore new programming models for NVM. The starting point is a set of three asumptions for an NVM-based programming model: Compared to traditional persistent media, NVM is fast.

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Amazon EC2 Cluster GPU Instances - All Things Distributed

All Things Distributed

We believe that making these GPU resources available for everyone to use at low cost will drive new innovation in the application of highly parallel programming models. For example, the most fundamental abstraction trade-off has always been latency versus throughput. General Purpose GPU programming. From CPU to GPU.

AWS 136
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Why I hate MPI (from a performance analysis perspective)

John McCalpin

This is an intellectually challenging and labor-intensive exercise, requiring detailed review of the published details of each of the components of the system, and usually requiring significant “detective work” (using customized microbenchmarks, hardware performance counter analysis, and creative thinking) to fill in the gaps.

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Transforming enterprise integration with reactive streams

O'Reilly Software

Software today is not typically a single program—something that is executed by an operator or user, producing a result to that person—but rather a service : something that runs for the benefit of its consumers, a provider of value. The most common programming task in the world. Let’s dive into this concept for a bit.

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A peculiar throughput limitation on Intel’s Xeon Phi x200 (Knights Landing)

John McCalpin

There was no deep goal — just a desire to see the maximum GFLOPS in action. The exercise seemed simple enough — just fix one item in the Colfax code and we should be finished. This is an uninspiring fraction of peak performance that would normally suggest significant inefficiencies in either the hardware or software.

Latency 40
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The Agile PMO: Consistent Project Gatekeepers

The Agile Manager

Traditional IT projects are mass economy-of-scale exercises: once development begins, armies of developers are unleashed. Traditionally in IT, our gatekeepers are typically several different waves of requirements and specification documents, then software, then test results, then a production event.

Latency 40