Commit a15a791

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Tweaks

Signed-off-by: AlexDBlack <blacka101@gmail.com>

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cpu.md

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`‎cpu.md‎`

Lines changed: 15 additions & 11 deletions

Original file line number	Diff line number	Diff line change
`@@ -6,22 +6,24 @@ layout: default`
`6`	`6`	`redirect_from: "/cpu"`
`7`	`7`	`---`
`8`	`8`
	`9`	`+# ND4J - CPU (nd4j-native) AVX Configuration`
`9`	`10`
`10`	`11`	`### What is AVX, and why does it matter?`
`11`	`12`
`12`		`-AVX (Advanced Vector Extensions) is a set of CPU instructions for accelerating numerical computations.`
`13`		`-AVX only applies to nd4j-native (CPU) backend for x86 devices, not GPUs and not ARM/PPC devices.`
	`13`	`+AVX (Advanced Vector Extensions) is a set of CPU instructions for accelerating numerical computations. See [Wikipedia](https://en.wikipedia.org/wiki/Advanced_Vector_Extensions) for more details.`
`14`	`14`
`15`		`-Why AVX matters: performance.`
	`15`	`+Note that AVX only applies to nd4j-native (CPU) backend for x86 devices, not GPUs and not ARM/PPC devices.`
`16`	`16`
`17`		`-You want to use the highest level of AVX supported by your system.`
	`17`	`+Why AVX matters: performance. You want to use the version of ND4J compiled with the highest level of AVX supported by your system.`
`18`	`18`
`19`		`-AVX support - summary:`
	`19`	`+`
	`20`	`+AVX support for different CPUs - summary:`
`20`	`21`	`* Most modern x86 CPUs: AVX2 is supported`
`21`	`22`	`* Some high-end server CPUs: AVX512 may be supported`
`22`	`23`	`* Old CPUs (pre 2012) and low power x86 (Atom, Celeron): No AVX support (usually)`
`23`	`24`
`24`		`-AVX is backward compatible, so it's possible run a generic x86 or AVX2 binary on a system supporting AVX512.`
	`25`	`+AVX is backward compatible, so for example it's possible run a generic x86 or AVX2 binary on a system supporting AVX512.`
	`26`	`+However it is not possible to run`
`25`	`27`
`26`	`28`	`Note on current snapshots (and in future releases, after 1.0.0-beta5) you may get a warning as follows, if AVX is not configured optimally:`
`27`	`29`	```
`@@ -35,20 +37,22 @@ o.n.l.c.n.CpuNDArrayFactory - **************************************************`
`35`	`37`
`36`	`38`	`### Configuring AVX in ND4J/DL4J`
`37`	`39`
`38`		`-Defaults:`
	`40`	`+As noted earlier, for best performance you should use the version of ND4J that matches your CPU's supported AVX level.`
	`41`	`+`
	`42`	`+ND4J defaults configuration (when just including the nd4j-native or nd4j-native-platform dependencies without maven classifier configuration):`
`39`	`43`	`* 1.0.0-beta5 and earlier: "generic x86" (no AVX) is the default for nd4j/nd4j-platform dependencies`
`40`	`44`	`* Current snapshots and later versions of ND4J: AVX2 is the default`
`41`	`45`
`42`	`46`
`43`	`47`	`To configure AVX2 and AVX512, you need to specify a classifier for the appropriate architecture.`
`44`	`48`
`45`		`-The following binaries are provided for x86 architectures:`
	`49`	`+The following binaries (nd4j-native classifiers) are provided for x86 architectures:`
`46`	`50`	* Generic x86 (no AVX): `linux-x86_64`, `windows-x86_64`, `macosx-x86_64`
`47`	`51`	* AVX2: `linux-x86_64-avx2`, `windows-x86_64-avx2`, `macosx-x86_64-avx2`
`48`	`52`	* AVX512: `linux-x86_64-avx512`
`49`	`53`
`50`	`54`
`51`		`-Example: AVX2 on Windows (Maven pom.xml)`
	`55`	`+Example: Configuring AVX2 on Windows (Maven pom.xml)`
`52`	`56`	```
`53`	`57`	`<dependency>`
`54`	`58`	`<groupId>org.nd4j</groupId>`
`@@ -65,7 +69,7 @@ Example: AVX2 on Windows (Maven pom.xml)`
`65`	`69`	```
`66`	`70`
`67`	`71`
`68`		`-Example: AVX512 on Linux (Maven pom.xml)`
	`72`	`+Example: Configuring AVX512 on Linux (Maven pom.xml)`
`69`	`73`	```
`70`	`74`	`<dependency>`
`71`	`75`	`<groupId>org.nd4j</groupId>`
`@@ -81,4 +85,4 @@ Example: AVX512 on Linux (Maven pom.xml)`
`81`	`85`	`</dependency>`
`82`	`86`	```
`83`	`87`
`84`		`-Note that you need both dependencies - with and without the classifier.`
	`88`	`+Note that you need both nd4j-native dependencies - with and without the classifier.`

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