# How to know if avx512 in using?

**URL:** <https://community.konduit.ai/t/how-to-know-if-avx512-in-using/3366>\
**Category:** DL4J\
**Created:** [May 23, 2025, 4:01am UTC](https://community.konduit.ai/t/how-to-know-if-avx512-in-using/3366 "2025-05-23T04:01:09Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![Booker](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/booker/32/987_2.png) [@Booker](https://community.konduit.ai/u/Booker)\
**Post date:** [May 23, 2025, 4:01am UTC](https://community.konduit.ai/t/how-to-know-if-avx512-in-using/3366/1 "2025-05-23T04:01:09Z")

</div>

09:04:36.249 [main] INFO org.nd4j.linalg.factory.Nd4jBackend – Loaded [CpuBackend] backend  
09:04:36.578 [main] INFO org.nd4j.nativeblas.NativeOpsHolder – Number of threads used for linear algebra: 8  
09:04:36.580 [main] INFO org.nd4j.linalg.cpu.nativecpu.CpuNDArrayFactory – Binary level AVX512 optimization level AVX512  
09:04:36.583 [main] INFO org.nd4j.nativeblas.Nd4jBlas – Number of threads used for OpenMP BLAS: 8  
09:04:36.589 [main] INFO org.nd4j.linalg.api.ops.executioner.DefaultOpExecutioner – Backend used: [CPU]; OS: [Linux]  
09:04:36.589 [main] INFO org.nd4j.linalg.api.ops.executioner.DefaultOpExecutioner – Cores: [16]; Memory: [4.0GB];  
09:04:36.589 [main] INFO org.nd4j.linalg.api.ops.executioner.DefaultOpExecutioner – Blas vendor: [OPENBLAS]  
09:04:36.591 [main] INFO org.nd4j.linalg.cpu.nativecpu.CpuBackend – Backend build information:  
GCC: “7.5.0”  
STD version: 201103L  
DEFAULT\_ENGINE: samediff::ENGINE\_CPU  
HAVE\_FLATBUFFERS  
HAVE\_OPENBLAS

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<div class="post-metadata">

**Author:** ![agibsonccc](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/agibsonccc/32/697_2.png) [@agibsonccc](https://community.konduit.ai/u/agibsonccc)\
**Post date:** [May 23, 2025, 6:53am UTC](https://community.konduit.ai/t/how-to-know-if-avx512-in-using/3366/2 "2025-05-23T06:53:35Z")

</div>

@Booker can you show your pom? You can’t just use nd4j-native-platform. You need to include a special classifier with the avx512 suffix.

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<div class="post-metadata">

**Author:** ![Booker](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/booker/32/987_2.png) [@Booker](https://community.konduit.ai/u/Booker)\
**Post date:** [May 23, 2025, 8:22am UTC](https://community.konduit.ai/t/how-to-know-if-avx512-in-using/3366/3 "2025-05-23T08:22:09Z")

</div>

```
<properties>
	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	<nd4j.backend>nd4j-native</nd4j.backend>
	<java.version>21</java.version>
	<dl4j.version>1.0.0-M2.1</dl4j.version>
</properties>

<repositories>
	<repository>
		<id>snapshots-repo</id>
		<url>https://s01.oss.sonatype.org/content/repositories/snapshots</url>
		<releases>
			<enabled>false</enabled>
		</releases>
		<snapshots>
			<enabled>true</enabled>
			<updatePolicy>daily</updatePolicy>
		</snapshots>
	</repository>
</repositories>

<dependencies>
	<dependency>
		<groupId>org.nd4j</groupId>
		<artifactId>${nd4j.backend}</artifactId>
		<version>${dl4j.version}</version>
	</dependency>
	<dependency>
		<groupId>org.nd4j</groupId>
		<artifactId>${nd4j.backend}</artifactId>
		<version>${dl4j.version}</version>
		<classifier>linux-x86_64-avx512</classifier>
	</dependency>
	<dependency>
		<groupId>org.deeplearning4j</groupId>
		<artifactId>deeplearning4j-core</artifactId>
		<version>${dl4j.version}</version>
	</dependency>
	<dependency>
		<groupId>org.deeplearning4j</groupId>
		<artifactId>deeplearning4j-nn</artifactId>
		<version>${dl4j.version}</version>
	</dependency>
	<dependency>
		<groupId>org.deeplearning4j</groupId>
		<artifactId>deeplearning4j-ui</artifactId>
		<version>${dl4j.version}</version>
	</dependency>
	<dependency>
		<groupId>org.nd4j</groupId>
		<artifactId>samediff-import-tensorflow</artifactId>
		<version>${dl4j.version}</version>
	</dependency>
	<dependency>
		<groupId>org.nd4j</groupId>
		<artifactId>python4j-core</artifactId>
		<version>${dl4j.version}</version>
	</dependency>
	<dependency>
		<groupId>org.nd4j</groupId>
		<artifactId>python4j-numpy</artifactId>
		<version>${dl4j.version}</version>
	</dependency>

```

Does it need specific -D arguments like mkl etc to use avx512 and what logs should print when using avx512?

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<div class="post-metadata">

**Author:** ![Booker](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/booker/32/987_2.png) [@Booker](https://community.konduit.ai/u/Booker)\
**Post date:** [May 29, 2025, 6:39pm UTC](https://community.konduit.ai/t/how-to-know-if-avx512-in-using/3366/4 "2025-05-29T18:39:11Z")

</div>

@agibsonccc Hi, how to let it work with avx512 in M2.1 or snapshot?

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<div class="post-metadata">

**Author:** ![agibsonccc](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/agibsonccc/32/697_2.png) [@agibsonccc](https://community.konduit.ai/u/agibsonccc)\
**Post date:** [May 30, 2025, 7:02am UTC](https://community.konduit.ai/t/how-to-know-if-avx512-in-using/3366/5 "2025-05-30T07:02:36Z")

</div>

@Booker this looks ok. Do you have a specific issue? You just need the dependency without the classifier and the one with the avx512 suffix. Did you try it?

---

<div class="post-metadata">

**Author:** ![Booker](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/booker/32/987_2.png) [@Booker](https://community.konduit.ai/u/Booker)\
**Post date:** [May 30, 2025, 10:03am UTC](https://community.konduit.ai/t/how-to-know-if-avx512-in-using/3366/6 "2025-05-30T10:03:39Z")

</div>

@agibsonccc The pom and logs shown in the last posts. How to check if avx512 in using by logs?  
INFO org.nd4j.linalg.cpu.nativecpu.CpuNDArrayFactory – Binary level AVX512 optimization level AVX512 —Does this log only shown the avx512 is detected and not sure if avx512 in using?

HAVE\_OPENBLAS —Why not shown HAVE\_ONEDNN?

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<div class="post-metadata">

**Author:** ![agibsonccc](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/agibsonccc/32/697_2.png) [@agibsonccc](https://community.konduit.ai/u/agibsonccc)\
**Post date:** [June 17, 2025, 11:49am UTC](https://community.konduit.ai/t/how-to-know-if-avx512-in-using/3366/7 "2025-06-17T11:49:49Z")

</div>

@Booker there’s a separate classifier for onednn. It has its own suffix. See:

> **[Central Repository: org/nd4j/nd4j-native/1.0.0-M2.1](https://repo1.maven.org/maven2/org/nd4j/nd4j-native/1.0.0-M2.1/)**