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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for May 1st, 2018

Delphi: There is a FastMM4 fork with AVX support and multi-threaded enhancements (faster locking) – how will it impact floating point heavy applications (as Delphi uses SSE instructions for floating point)

Posted by jpluimers on 2018/05/01

Interesting fork of FastMM4 for which I now think I understand why it is not merged into the regular FastMM4 repository: [WayBack] GitHub – maximmasiutin/FastMM4-AVX: FastMM4 fork with AVX support and multi-threaded enhancements (faster locking).

The fork does two things:

  • it has multi-threading enhancements (faster locking)
  • AVX support which seems tough for floating point heavy applications as Delphi generates SSE instructions for them

Reminder to self: how big is that impact and could the locking be separately merged into the base repository?

Eric Grange:
Looking at https://github.com/pleriche/FastMM4/issues/36 and given than the compile generates SSE2 code for floating point, I guess using AVX may be problematic when your code also does a lot of floating point using Delphi code (rather than AVX asm)

It could be that this repository is using only AVX-128, which might not have a penalty as per Advanced Vector Extensions – Wikipedia:

The AVX instructions support both 128-bit and 256-bit SIMD. The 128-bit versions can be useful to improve old code without needing to widen the vectorization, and avoid the penalty of going from SSE to AVX, they are also faster on some early AMD implementations of AVX. This mode is sometimes known as AVX-128.

Via: [WayBack] Do you use Embarcadero version of FastMM or the “official” bleeding edge version of FastMM from the gitHub repository? Any idea what are the difference… – Tommi Prami – Google+

–jeoren

Posted in Delphi, Development, FastMM, Software Development | 5 Comments »

Node.js ES2015/ES6 support – compare language/runtime versions support for many items

Posted by jpluimers on 2018/05/01

[WayBackNode.js ES2015/ES6 support

via: [WayBack] Good thing, compare language/runtime versions support for many items http://node.green/ – David Berneda – Google+

–jeroen

Posted in Development, JavaScript/ECMAScript, Scripting, Software Development | Leave a Comment »

Limits on Everything – The Isoblog.

Posted by jpluimers on 2018/05/01

Via [WayBackLimits on Everything – The Isoblog.:

A posting at Brave New Geek about limits on everything, for example limits on message sizes and numbers of in-flight messages in message queues. Interesting read.

Very interesting read indeed: [WayBackTake It to the Limit: Considerations for Building Reliable Systems – Brave New Geek

You have to set limits, which begs for a few questions:

  1. how to find out which limits and at what levels
  2. how to enforce these limits

Food for thought…

The first can be done with benchmarking, see for instance these from the same blogs above:

Enforcing limits depends in your infrastructure and your communication stacks.

–jeroen

Posted in Cloud, Development, Infrastructure, Opinions, Software Development | Leave a Comment »

 
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