benchmarks/src/main/java/org/lmdbjava/bench/Common.java at master · lmdbjava/benchmarks · GitHub

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* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

package org.lmdbjava.bench;

import static java.lang.Integer.BYTES;

import static java.lang.System.getProperty;

import static java.lang.System.out;

import static jnr.posix.POSIXFactory.getPOSIX;

import static org.openjdk.jmh.annotations.Scope.Benchmark;

import java.io.File;

import java.io.IOException;

import java.util.zip.CRC32;

import jnr.posix.FileStat;

import jnr.posix.POSIX;

import org.agrona.collections.IntHashSet;

import org.apache.commons.math3.random.BitsStreamGenerator;

import org.apache.commons.math3.random.MersenneTwister;

import org.openjdk.jmh.annotations.Param;

import org.openjdk.jmh.annotations.State;

import org.openjdk.jmh.infra.BenchmarkParams;

/**

* Common JMH {@link State} superclass for all DB benchmark states.

* <p>

* Members do not reflect the typical code standards of the LmdbJava project due

* to compliance requirements with JMH {@link Param} and {@link State}.

@State(Benchmark)

public class Common {

static final byte[] RND_MB = new byte[1_048_576];

static final int STRING_KEY_LENGTH = 16;

private static final POSIX POSIX = getPOSIX();

private static final BitsStreamGenerator RND = new MersenneTwister();

private static final int S_BLKSIZE = 512; // from sys/stat.h

private static final File TMP_BENCH;

File compact;

CRC32 crc;

/**

* Keys are always an integer, however they are actually stored as integers

* (taking 4 bytes) or as zero-padded 16 byte strings. Storing keys as

* integers offers a major performance gain.

@Param("true")

boolean intKey;

/**

* Determined during {@link #setup()} based on {@link #intKey} value.

int keySize;

/**

* Keys in designated (random/sequential) order.

int[] keys;

/**

* Number of entries to read/write to the database.

@Param("1000000")

int num;

/**

* Whether the keys are to be inserted into the database in sequential order

* (and in the "readKeys" case, read back in that order). For LMDB, sequential

* inserts use {@link org.lmdbjava.PutFlags#MDB_APPEND} and offer a major

* performance gain. If this field is false, the append flag will not be used

* and the keys will instead be inserted (and read back via "readKeys") in a

* random order.

@Param("true")

boolean sequential;

File tmp;

/**

* Whether the values contain random bytes or are simply the same as the key.

* If true, the random bytes are obtained sequentially from a 1 MB random byte

* buffer.

@Param("false")

boolean valRandom;

/**

* Number of bytes in each value.

@Param("100")

int valSize;

static {

RND.nextBytes(RND_MB);

final String tmpParent = getProperty("java.io.tmpdir");

TMP_BENCH = new File(tmpParent, "lmdbjava-benchmark-scratch");

}

public void setup(final BenchmarkParams b) throws IOException {

keySize = intKey ? BYTES : STRING_KEY_LENGTH;

crc = new CRC32();

final IntHashSet set = new IntHashSet(num);

keys = new int[num];

for (int i = 0; i < num; i++) {

if (sequential) {

keys[i] = i;

} else {

while (true) {

int candidateKey = RND.nextInt();

if (candidateKey < 0) {

candidateKey *= -1;

}

if (!set.contains(candidateKey)) {

set.add(candidateKey);

keys[i] = candidateKey;

break;

}

rmdir(TMP_BENCH);

tmp = create(b, "");

compact = create(b, "-compacted");

}

public void reportSpaceBeforeClose() {

if (tmp.getName().contains(".readKey-")) {

reportSpaceUsed(tmp, "before-close");

}

public void teardown() throws IOException {

// we only output for key, as all impls offer it and it should be fixed

if (tmp.getName().contains(".readKey-")) {

reportSpaceUsed(tmp, "after-close");

}

rmdir(TMP_BENCH);

}

protected void reportSpaceUsed(final File dir, final String desc) {

final File[] files = dir.listFiles();

if (files == null) {

return;

}

long bytes = 0;

for (final File f : files) {

if (f.isDirectory()) {

throw new UnsupportedOperationException("impl created directory");

}

final FileStat stat = POSIX.stat(f.getAbsolutePath());

bytes += stat.blocks() * S_BLKSIZE;

}

out.println("\nBytes\t" + desc + "\t" + bytes + "\t" + dir.getName());

}

final String padKey(final int key) {

final String skey = Integer.toString(key);

return "0000000000000000".substring(0, 16 - skey.length()) + skey;

}

private File create(final BenchmarkParams b, final String suffix) {

final File f = new File(TMP_BENCH, b.id() + suffix);

if (!f.mkdirs()) {

throw new IllegalStateException("Cannot mkdir " + f);

}

return f;

}

private void rmdir(final File file) {

if (!file.exists()) {

return;

}

if (file.isDirectory()) {

final File[] files = file.listFiles();

if (files == null) {

return;

}

for (final File f : files) {

rmdir(f);

}

if (!file.delete()) {

throw new IllegalStateException("Cannot delete " + file);

}

benchmarks/src/main/java/org/lmdbjava/bench/Common.java at master · lmdbjava/benchmarks · GitHub

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