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‎.editorconfig

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root = true
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[*]
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end_of_line = lf
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insert_final_newline = true
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charset = utf-8
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[*.{java,c,cpp,js,xml,html,sh}]
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indent_style = tab
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indent_size = 4
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trim_trailing_whitespace = true

‎.gitignore

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local
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h2-1.4.200.jar
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# build
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target
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# eclipse
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.project
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.classpath
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.settings
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# tomcat
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sample/src/main/tomcat/work/
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sample/src/main/tomcat/temp/

‎LICENSE

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Apache License
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‎README.md

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# Pointer-jumping on a GPU using Aparapi
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Classic [pointer jumping](https://en.wikipedia.org/wiki/Pointer_jumping) algorithm summarizing values from an array adapted to run on a GPU instead of a PRAM using [Aparapi](https://aparapi.com/).
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On my integrated Intel GPU (maxWorkWorkGroupSize=256, maxComputeUnits=48), this works 4 times slower than sequential adding on the CPU.
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This is probably because the algorithm is memory bound and spends most time on fetching values from the memory. See [this SO answer](https://stackoverflow.com/questions/22866901/using-java-with-nvidia-gpus-cuda#22868938) for more info.
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The other reason may be that [intel has only 16 barrier registers (and only 64kB local memory _shared_ among running work-groups)](https://software.intel.com/content/www/us/en/develop/documentation/iocl-opg/top/optimizing-opencl-usage-with-intel-processor-graphics/work-group-size-recommendations-summary.html), so only up to 16 work-groups can run in parallel.
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To test this theory I need to run this on an Nvidia or AMD GPU, but I don't have any at hand. If someone who has, could run this code and send me back the results, I'd be very grateful :)
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## building and running
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First, make sure that you have an openCL driver for your GPU installed.
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```bash
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mvn clean package
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java -jar target/pointer-jumping-gpu-1.0-SNAPSHOT-jar-with-dependencies.jar
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```
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Thanks!

‎pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>pl.morgwai.samples</groupId>
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<artifactId>pointer-jumping-gpu</artifactId>
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<version>1.0-SNAPSHOT</version>
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<name>Java Sample</name>
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<properties>
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<maven.compiler.source>11</maven.compiler.source>
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<maven.compiler.target>11</maven.compiler.target>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<dependencies>
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<dependency>
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<groupId>com.aparapi</groupId>
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<artifactId>aparapi</artifactId>
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<version>3.0.0</version>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-assembly-plugin</artifactId>
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<executions>
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<execution>
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<phase>package</phase>
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<goals>
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<goal>single</goal>
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</goals>
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<configuration>
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<archive>
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<manifest>
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<mainClass>pl.morgwai.samples.aparapi.PointerJumpingKernel</mainClass>
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</manifest>
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</archive>
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<descriptorRefs>
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<descriptorRef>jar-with-dependencies</descriptorRef>
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</descriptorRefs>
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</configuration>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>

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