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...ler-benchmarks/src/main/java/com/onthegomap/planetiler/benchmarks/BenchmarkLineMerge.java
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| @@ -0,0 +1,114 @@ | ||
| package com.onthegomap.planetiler.benchmarks; | ||
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| import com.onthegomap.planetiler.geo.GeoUtils; | ||
| import com.onthegomap.planetiler.util.Format; | ||
| import com.onthegomap.planetiler.util.FunctionThatThrows; | ||
| import com.onthegomap.planetiler.util.Gzip; | ||
| import com.onthegomap.planetiler.util.LoopLineMerger; | ||
| import java.io.IOException; | ||
| import java.math.BigDecimal; | ||
| import java.math.MathContext; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Path; | ||
| import java.time.Duration; | ||
| import java.util.ArrayList; | ||
| import java.util.Collection; | ||
| import java.util.List; | ||
| import org.locationtech.jts.geom.Coordinate; | ||
| import org.locationtech.jts.geom.CoordinateXY; | ||
| import org.locationtech.jts.geom.Geometry; | ||
| import org.locationtech.jts.geom.GeometryFactory; | ||
| import org.locationtech.jts.geom.LineString; | ||
| import org.locationtech.jts.io.ParseException; | ||
| import org.locationtech.jts.io.WKBReader; | ||
| import org.locationtech.jts.operation.linemerge.LineMerger; | ||
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|
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| public class BenchmarkLineMerge { | ||
| private static int numLines; | ||
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| public static void main(String[] args) throws Exception { | ||
| for (int i = 0; i < 10; i++) { | ||
| time(" JTS", geom -> { | ||
| var lm = new LineMerger(); | ||
| lm.add(geom); | ||
| return lm.getMergedLineStrings(); | ||
| }); | ||
| time(" loop(0)", geom -> loopMerger(0).add(geom).getMergedLineStrings()); | ||
| time(" loop(0.1)", geom -> loopMerger(0.1).add(geom).getMergedLineStrings()); | ||
| time("loop(20.0)", geom -> loopMerger(20).add(geom).getMergedLineStrings()); | ||
| } | ||
| System.err.println(numLines); | ||
| } | ||
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| private static LoopLineMerger loopMerger(double minLength) { | ||
| var lm = new LoopLineMerger(); | ||
| lm.setMinLength(minLength); | ||
| lm.setStubMinLength(minLength); | ||
| lm.setLoopMinLength(minLength); | ||
| lm.setTolerance(1); | ||
| lm.setMergeStrokes(true); | ||
| return lm; | ||
| } | ||
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| private static void time(String name, FunctionThatThrows<Geometry, Collection<LineString>> fn) throws Exception { | ||
| System.err.println(String.join("\t", | ||
| name, | ||
| timeMillis(read("mergelines_200433_lines.wkb.gz"), fn), | ||
| timeMillis(read("mergelines_239823_lines.wkb.gz"), fn), | ||
| "(/s):", | ||
| timePerSec(read("mergelines_1759_point_line.wkb.gz"), fn), | ||
| timePerSec(makeLines(50, 2), fn), | ||
| timePerSec(makeLines(10, 10), fn), | ||
| timePerSec(makeLines(2, 50), fn) | ||
| )); | ||
| } | ||
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| private static String timePerSec(Geometry geometry, FunctionThatThrows<Geometry, Collection<LineString>> fn) | ||
| throws Exception { | ||
| long start = System.nanoTime(); | ||
| long end = start + Duration.ofSeconds(1).toNanos(); | ||
| int num = 0; | ||
| for (; System.nanoTime() < end;) { | ||
| numLines += fn.apply(geometry).size(); | ||
| num++; | ||
| } | ||
| return Format.defaultInstance() | ||
| .numeric(Math.round(num * 1d / ((System.nanoTime() - start) * 1d / Duration.ofSeconds(1).toNanos())), true); | ||
| } | ||
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| private static String timeMillis(Geometry geometry, FunctionThatThrows<Geometry, Collection<LineString>> fn) | ||
| throws Exception { | ||
| long start = System.nanoTime(); | ||
| long end = start + Duration.ofSeconds(1).toNanos(); | ||
| int num = 0; | ||
| for (; System.nanoTime() < end;) { | ||
| numLines += fn.apply(geometry).size(); | ||
| num++; | ||
| } | ||
| // equivalent of toPrecision(3) | ||
| long nanosPer = (System.nanoTime() - start) / num; | ||
| var bd = new BigDecimal(nanosPer, new MathContext(3)); | ||
| return Format.padRight(Duration.ofNanos(bd.longValue()).toString().replace("PT", ""), 6); | ||
| } | ||
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| private static Geometry read(String fileName) throws IOException, ParseException { | ||
| var path = Path.of("planetiler-core", "src", "test", "resources", "mergelines", fileName); | ||
| byte[] bytes = Gzip.gunzip(Files.readAllBytes(path)); | ||
| return new WKBReader().read(bytes); | ||
| } | ||
|
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| private static Geometry makeLines(int lines, int parts) { | ||
| List<LineString> result = new ArrayList<>(); | ||
| double idx = 0; | ||
| for (int i = 0; i < lines; i++) { | ||
| Coordinate[] coords = new Coordinate[parts]; | ||
| for (int j = 0; j < parts; j++) { | ||
| coords[j] = new CoordinateXY(idx, idx); | ||
| idx += 0.5; | ||
| } | ||
| result.add(GeoUtils.JTS_FACTORY.createLineString(coords)); | ||
| } | ||
| return new GeometryFactory().createMultiLineString(result.toArray(LineString[]::new)); | ||
| } | ||
| } |
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