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diff --git a/zarb-ml/mageia-dev/2013-March/023906.html b/zarb-ml/mageia-dev/2013-March/023906.html new file mode 100644 index 000000000..00ef33c7c --- /dev/null +++ b/zarb-ml/mageia-dev/2013-March/023906.html @@ -0,0 +1,103 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> +<HTML> + <HEAD> + <TITLE> [Mageia-dev] Packages not rebuilt since Mageia 1 + </TITLE> + <LINK REL="Index" HREF="index.html" > + <LINK REL="made" HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20Packages%20not%20rebuilt%20since%20Mageia%201&In-Reply-To=%3Ckivscj%244jl%241%40ger.gmane.org%3E"> + <META NAME="robots" CONTENT="index,nofollow"> + <META http-equiv="Content-Type" content="text/html; charset=us-ascii"> + <LINK REL="Previous" HREF="023867.html"> + <LINK REL="Next" HREF="023919.html"> + </HEAD> + <BODY BGCOLOR="#ffffff"> + <H1>[Mageia-dev] Packages not rebuilt since Mageia 1</H1> + <B>eatdirt</B> + <A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20Packages%20not%20rebuilt%20since%20Mageia%201&In-Reply-To=%3Ckivscj%244jl%241%40ger.gmane.org%3E" + TITLE="[Mageia-dev] Packages not rebuilt since Mageia 1">dirteat at gmail.com + </A><BR> + <I>Wed Mar 27 23:38:15 CET 2013</I> + <P><UL> + <LI>Previous message: <A HREF="023867.html">[Mageia-dev] Packages not rebuilt since Mageia 1 +</A></li> + <LI>Next message: <A HREF="023919.html">[Mageia-dev] Packages not rebuilt since Mageia 1 +</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#23906">[ date ]</a> + <a href="thread.html#23906">[ thread ]</a> + <a href="subject.html#23906">[ subject ]</a> + <a href="author.html#23906">[ author ]</a> + </LI> + </UL> + <HR> +<!--beginarticle--> +<PRE>On 26/03/13 15:24, Pascal Terjan wrote: +><i> There are 26 packages. +</I>><i> +</I>><i> atlas +</I> +I think, and unless someone complains, this one should be dropped. Atlas +is supposed to provice fast routines already provided by blas and lapack +(that we have), but: + +<A HREF="http://math-atlas.sourceforge.net/atlas_install/node27.html">http://math-atlas.sourceforge.net/atlas_install/node27.html</A> + +says: + +"Many users ask how ATLAS can be used to build libraries that will run +on all x86 platforms. In general, this is a bad idea: ATLAS gets its +speed by specializing for particular platforms, so the more generic a +library is the less performance it will achieve!" + +and this is what we are doing. We even compile it with sseX options +which is soon worse than doing nothing: + +" +Never use these libraries unless this portability is absolutely +required. They must use portable settings for blocking, for instance, +which will mean that on many platforms they will use only a fraction of +the actual cache, causing large performance drops. Even worse, peak +performance may by reduced by as much as factor of 8, due to not using +the proper ISA extension. The most portable ISA uses only the x87 unit, +which has a much lower peak rate on most modern machines (eg., an Intel +sandy bridge can do 16 flops/cycle using AVX in single precision, but +only 8 flops/cycle if using SSE, and only 2 flops/cycle using the x87 unit). +" + + +Cheers, +Chris, + +</PRE> + + + + + + + + + + + + +<!--endarticle--> + <HR> + <P><UL> + <!--threads--> + <LI>Previous message: <A HREF="023867.html">[Mageia-dev] Packages not rebuilt since Mageia 1 +</A></li> + <LI>Next message: <A HREF="023919.html">[Mageia-dev] Packages not rebuilt since Mageia 1 +</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#23906">[ date ]</a> + <a href="thread.html#23906">[ thread ]</a> + <a href="subject.html#23906">[ subject ]</a> + <a href="author.html#23906">[ author ]</a> + </LI> + </UL> + +<hr> +<a href="https://www.mageia.org/mailman/listinfo/mageia-dev">More information about the Mageia-dev +mailing list</a><br> +</body></html> |