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| Original file line number | Diff line number | Diff line change |
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| @@ -1 +1,15 @@ | ||
| # usl-modeler | ||
| # usl-modeler | ||
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| This little repository contains the Java code we put together in order to use [usl4j](github.com/codahale/usl4j) during the first Web Applications II laboratory. | ||
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| ## Usage | ||
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| The program accepts the input filename and the output filename as arguments. | ||
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| Using the {concurrency, throughput} pairs in the input file, it models a model that obeys to the the Universal Scalability Law, and writes in the output file the predicted throughput at increasing concurrency levels. | ||
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| A command line example is: | ||
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| ```bash | ||
| java -jar usl-modeler.jar <input-file> <output-file> | ||
| ``` |
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| Original file line number | Diff line number | Diff line change |
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| <?xml version="1.0" encoding="UTF-8"?> | ||
| <project xmlns="http://maven.apache.org/POM/4.0.0" | ||
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | ||
| xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> | ||
| <modelVersion>4.0.0</modelVersion> | ||
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| <groupId>io.github.kotlandpolito</groupId> | ||
| <artifactId>usl-modeler</artifactId> | ||
| <version>1.0</version> | ||
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| <properties> | ||
| <maven.compiler.source>8</maven.compiler.source> | ||
| <maven.compiler.target>8</maven.compiler.target> | ||
| <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> | ||
| <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> | ||
| </properties> | ||
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| <dependencies> | ||
| <dependency> | ||
| <groupId>com.codahale</groupId> | ||
| <artifactId>usl4j</artifactId> | ||
| <version>0.7.0</version> | ||
| </dependency> | ||
| </dependencies> | ||
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| </project> |
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| Manifest-Version: 1.0 | ||
| Main-Class: io.github.kotlandpolito.UslModeler | ||
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| package io.github.kotlandpolito; | ||
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| import com.codahale.usl4j.Measurement; | ||
| import com.codahale.usl4j.Model; | ||
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| import java.io.FileNotFoundException; | ||
| import java.util.ArrayList; | ||
| import java.util.Arrays; | ||
| import java.util.List; | ||
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| public class UslModeler { | ||
| public static void main(String[] args) { | ||
| if (args.length < 2){ | ||
| System.out.println("USAGE:\njava -jar usl-modeler-<version>.jar <input-file> <output-file>"); | ||
| return; | ||
| } | ||
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| List<String[]> lines; | ||
| try { | ||
| lines = Utils.parseCsv(args[0]); | ||
| } catch (FileNotFoundException e) { | ||
| System.out.println("Couldn't find the specified input file"); | ||
| return; | ||
| } | ||
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| double[][] points = lines.stream() | ||
| .map(Utils::stringArrayToDoubleArray) | ||
| .toArray(double[][]::new); | ||
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| // Map the points to measurements of concurrency and throughput, then build a model from them. | ||
| Model model = Arrays.stream(points) | ||
| .map(Measurement.ofConcurrency()::andThroughput) | ||
| .collect(Model.toModel()); | ||
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| // Predict the throughput for various levels of possible concurrency. | ||
| List<String[]> outLines = new ArrayList<>(); | ||
| for (int i = 1; i < 300; ++i) { | ||
| outLines.add(new String[]{String.valueOf(i), String.valueOf(model.throughputAtConcurrency(i))}); | ||
| } | ||
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| try { | ||
| Utils.writeCsv(args[1], outLines); | ||
| } catch (FileNotFoundException e) { | ||
| System.out.println("Couldn't write to the specified output file"); | ||
| } | ||
| } | ||
| } |
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