it.unimi.dsi.Util类的使用及代码示例

x33g5p2x  于2022-02-01 转载在 其他  
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本文整理了Java中it.unimi.dsi.Util类的一些代码示例，展示了Util类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Util类的具体详情如下：
包路径：it.unimi.dsi.Util
类名称：Util

Util介绍

[英]All-purpose static-method container class.
[中]通用静态方法容器类。

代码示例

代码示例来源：origin: it.unimi.dsi/dsiutils

  1. private String itemsPerTimeInterval(long startCount, final long currentTime, long baseTime) {
  2.   final double secondsPerItem = ((count - startCount) * 1000.0) / (currentTime - baseTime);
  3.   if (speedTimeUnit == TimeUnit.SECONDS || speedTimeUnit == null && secondsPerItem >= 1) return Util.format(secondsPerItem) + " " + itemsName +  "/s";
  4.   if (speedTimeUnit == TimeUnit.MINUTES || speedTimeUnit == null && secondsPerItem * 60 >= 1) return Util.format(secondsPerItem * 60) + " " + itemsName +  "/m";
  5.   if (speedTimeUnit == TimeUnit.HOURS || speedTimeUnit == null && secondsPerItem * 3600 >= 1) return Util.format(secondsPerItem * 3600) + " " + itemsName +  "/h";
  6.   return Util.format(secondsPerItem * 86400) + " " + itemsName +  "/d";
  7. }

代码示例来源：origin: it.unimi.di/mg4j

  1. private static String format( long v, long total ) {
  2.   return v + " (" + Util.formatSize( v / 8 ) + "B, " + Util.format( 100. * v / total ) + "%)\n";
  3. }

代码示例来源：origin: it.unimi.dsi/dsiutils

  1. /** Stores the identity permutation in a new array of given length.
  2.  *
  3.  * @param n the size of the array.
  4.  * @return a new array of length <code>n</code>, filled with the identity permutation.
  5.  */
  6. public static int[] identity(int n) {
  7.   return identity(new int[n]);
  8. }

代码示例来源：origin: it.unimi.dsi/mg4j-big

  1. percAvailableMemory = Util.percAvailableMemory();
  2. if ( ! outOfMemoryError && percAvailableMemory < PERC_AVAILABLE_MEMORY_CHECK ) {
  3.   LOGGER.info( "Starting compaction... (" + percAvailableMemory + "% available)" );
  4.   compacted = true;
  5.   Util.compactMemory();
  6.   percAvailableMemory = Util.percAvailableMemory();
  7.   LOGGER.info( "Compaction completed (" + percAvailableMemory + "% available)" );
  8. LOGGER.info( "Last set of batches indexed at " + Util.format( ( 1000. * occurrences ) / ( System.currentTimeMillis() - batchStartTime ) ) + " occurrences/s" );
  9. batchStartTime = System.currentTimeMillis();
  10. documentsInBatch = 0;

代码示例来源：origin: it.unimi.di/mg4j

  1. new FlaggedOption( "bufferSize", JSAP.INTSIZE_PARSER, Util.formatBinarySize( Combine.DEFAULT_BUFFER_SIZE ), JSAP.NOT_REQUIRED, 'b', "buffer-size", "The size of an I/O buffer." ),
  2. new FlaggedOption( "comp", JSAP.STRING_PARSER, JSAP.NO_DEFAULT, JSAP.NOT_REQUIRED, 'c', "comp", "A compression flag for the index (may be specified several times)." ).setAllowMultipleDeclarations( true ),
  3. new Switch( "noSkips", JSAP.NO_SHORTFLAG, "no-skips", "Disables skips." ),
  4. new FlaggedOption( "quantum", JSAP.INTEGER_PARSER, Integer.toString( BitStreamIndex.DEFAULT_FIXED_QUANTUM ), JSAP.NOT_REQUIRED, 'Q', "quantum", "Enable skips with given quantum, if positive; fix space occupancy of variable-quantum skip towers in percentage if negative." ),
  5. new FlaggedOption( "height", JSAP.INTSIZE_PARSER, Integer.toString( BitStreamIndex.DEFAULT_HEIGHT ), JSAP.NOT_REQUIRED, 'H', "height", "The skip height." ),
  6. new FlaggedOption( "skipBufferSize", JSAP.INTSIZE_PARSER, Util.formatBinarySize( SkipBitStreamIndexWriter.DEFAULT_TEMP_BUFFER_SIZE ), JSAP.NOT_REQUIRED, JSAP.NO_SHORTFLAG, "skip-buffer-size", "The size of the internal temporary buffer used while creating an index with skips." ),
  7. new FlaggedOption( "logInterval", JSAP.LONG_PARSER, Long.toString( ProgressLogger.DEFAULT_LOG_INTERVAL ), JSAP.NOT_REQUIRED, 'l', "log-interval", "The minimum time interval between activity logs in milliseconds." ),
  8. new UnflaggedOption( "outputBasename", JSAP.STRING_PARSER, JSAP.REQUIRED, "The basename of the resulting index." ),

代码示例来源：origin: it.unimi.dsi/webgraph

  1. this.bufferSize = Math.max(1, (bufferSize == 0 ? DEFAULT_BUFFER_SIZE : bufferSize) / ((Long.SIZE / Byte.SIZE) * (counterLongwords + 1)));
  2. info("Relative standard deviation: " + Util.format(100 * HyperLogLogCounterArray.relativeStandardDeviation(log2m)) + "% (" + m  + " registers/counter, " + registerSize + " bits/register, " + Util.format(m * registerSize / 8.) + " bytes/counter)");
  3. if (external) info("Running " + this.numberOfThreads + " threads with a buffer of " + Util.formatSize(this.bufferSize) + " counters");
  4. else info("Running " + this.numberOfThreads + " threads");
  5. for (int i = 0; i < this.discountFunction.length; i++) discountedCentrality[i] = new float[numNodes];
  6. info("HyperBall memory usage: " + Util.formatSize2(usedMemory()) + " [not counting graph(s)]");

代码示例来源：origin: it.unimi.dsi/sux4j

  1. final int[] t = Util.identity(numVars);
  2.   final int[] u = new int[t.length];
  3.   final int[] count = new int[numEquations + 1]; // CountSort
  4. LOGGER.debug("Active variables: " + numActive + " (" + Util.format(numActive * 100 / numVars) + "%)");

代码示例来源：origin: it.unimi.dsi/dsiutils

  1. /** Returns a random seed generated by {@link #randomSeed()} under the form of an array of eight bytes.
  2.  *
  3.  * @return a reasonably good random seed.
  4.  */
  5. public static byte[] randomSeedBytes() {
  6.   final long seed = Util.randomSeed();
  7.   final byte[] s = new byte[8];
  8.   for(int i = Long.SIZE / Byte.SIZE; i-- != 0;) s[i] = (byte)(seed >>> i);
  9.   return s;
  10. }

代码示例来源：origin: it.unimi.dsi/dsiutils

  1. private String freeMemory() {
  2.   return (displayFreeMemory ? "; used/avail/free/total/max mem: "
  3.       + Util.formatSize(RUNTIME.totalMemory() - RUNTIME.freeMemory()) + "/"
  4.       + Util.formatSize(RUNTIME.freeMemory() + (RUNTIME.maxMemory() - RUNTIME.totalMemory())) + "/"
  5.       + Util.formatSize(RUNTIME.freeMemory()) + "/"
  6.       + Util.formatSize(RUNTIME.totalMemory()) + "/"
  7.       + Util.formatSize(RUNTIME.maxMemory()) : "");
  8. }

代码示例来源：origin: blazegraph/database

  1. /** Ensures that Log4J is configured, by invoking, if necessary,
  2.  * {@link org.apache.log4j.BasicConfigurator#configure()}, and
  3.  * setting the root logger level to {@link Level#INFO}.
  4.  */
  6. public static void ensureLog4JIsConfigured() {
  7.   ensureLog4JIsConfigured( null, Level.INFO );
  8. }

代码示例来源：origin: it.unimi.dsi/webgraph

  1. /** Renumbers by decreasing size the components of this set.
  2.  *
  3.  * <p>After a call to this method, both the internal status of this class and the argument
  4.  * array are permuted so that the sizes of strongly connected components are decreasing
  5.  * in the component index.
  6.  *
  7.  *  @param size the components sizes, as returned by {@link #computeSizes()}.
  8.  */
  9. public void sortBySize(final int[] size) {
  10.   final int[] perm = Util.identity(size.length);
  11.   IntArrays.parallelRadixSortIndirect(perm, size, false);
  12.   IntArrays.reverse(perm);
  13.   final int[] copy = size.clone();
  14.   for (int i = size.length; i-- != 0;) size[i] = copy[perm[i]];
  15.   Util.invertPermutationInPlace(perm);
  16.   for(int i = component.length; i-- != 0;) component[i] = perm[component[i]];
  17. }

代码示例来源：origin: it.unimi.dsi/mg4j

  1. long percAvailableMemory = Util.percAvailableMemory();
  2. boolean compacted = false;
  3. if ( ! outOfMemoryError && percAvailableMemory < PERC_AVAILABLE_MEMORY_CHECK ) {
  4.   LOGGER.info( "Starting compaction... (" + percAvailableMemory + "% available)" );
  5.   compacted = true;
  6.   Util.compactMemory();
  7.   percAvailableMemory = Util.percAvailableMemory();
  8.   LOGGER.info( "Compaction completed (" + percAvailableMemory + "% available)" );
  9.   LOGGER.info( "Last set of batches indexed at " + Util.format( ( 1000. * occurrences ) / ( System.currentTimeMillis() - batchStartTime ) ) + " occurrences/s" );
  10.   batchStartTime = System.currentTimeMillis();
  11.   documentsInBatch = 0;

代码示例来源：origin: it.unimi.di/mg4j

  1. new FlaggedOption( "bufferSize", JSAP.INTSIZE_PARSER, Util.formatBinarySize( DEFAULT_BUFFER_SIZE ), JSAP.NOT_REQUIRED, 'b', "buffer-size", "The size of an I/O buffer." ),
  2. new FlaggedOption( "logInterval", JSAP.LONG_PARSER, Long.toString( ProgressLogger.DEFAULT_LOG_INTERVAL ), JSAP.NOT_REQUIRED, 'l', "log-interval", "The minimum time interval between activity logs in milliseconds." ),
  3. new FlaggedOption( "strategy", JSAP.STRING_PARSER, JSAP.NO_DEFAULT, JSAP.NOT_REQUIRED, 's', "strategy", "A serialised documental partitioning strategy." ),
  4. new Switch( "interleaved", JSAP.NO_SHORTFLAG, "interleaved", "Forces an interleaved index." ),
  5. new Switch( "highPerformance", 'h', "high-performance", "Forces a high-performance index." ),
  6. new FlaggedOption( "cacheSize", JSAP.INTSIZE_PARSER, Util.formatBinarySize( QuasiSuccinctIndexWriter.DEFAULT_CACHE_SIZE ), JSAP.NOT_REQUIRED, JSAP.NO_SHORTFLAG, "cache-size", "The size of the bit cache used while creating a quasi-succinct index." ),
  7. new FlaggedOption( "quantum", JSAP.INTSIZE_PARSER, "32", JSAP.NOT_REQUIRED, 'Q', "quantum", "The skip quantum." ),
  8. new FlaggedOption( "height", JSAP.INTSIZE_PARSER, Integer.toString( BitStreamIndex.DEFAULT_HEIGHT ), JSAP.NOT_REQUIRED, 'H', "height", "The skip height." ),
  9. new FlaggedOption( "skipBufferSize", JSAP.INTSIZE_PARSER, Util.formatBinarySize( SkipBitStreamIndexWriter.DEFAULT_TEMP_BUFFER_SIZE ), JSAP.NOT_REQUIRED, JSAP.NO_SHORTFLAG, "skip-buffer-size", "The size of the internal temporary buffer used while creating an index with skips." ),
  10. new UnflaggedOption( "inputBasename", JSAP.STRING_PARSER, JSAP.REQUIRED, "The basename of the global index." ),
  11. new UnflaggedOption( "outputBasename", JSAP.STRING_PARSER, JSAP.REQUIRED, "The basename of the local indices." )

代码示例来源：origin: it.unimi.dsi/webgraph

  1. /** Creates an Erd&#x151;s&ndash;R&eacute;nyi graph with given parameters and random seed.
  2.  *
  3.  * @param n the number of nodes.
  4.  * @param m the expected number of arcs.
  5.  * @param loops whether loops are allowed or not.
  6.  */
  7. public ErdosRenyiGraph(final int n, final long m, final boolean loops) {
  8.   this(n, m, Util.randomSeed(), loops);
  9. }

代码示例来源：origin: com.blazegraph/dsi-utils

  1. private String freeMemory() {
  2.   return ( displayFreeMemory ? "; used/avail/free/total/max mem: " 
  3.       + Util.formatSize( RUNTIME.totalMemory() - RUNTIME.freeMemory() ) + "/" 
  4.       + Util.formatSize( RUNTIME.freeMemory() + ( RUNTIME.maxMemory() - RUNTIME.totalMemory() ) ) + "/" 
  5.       + Util.formatSize( RUNTIME.freeMemory() ) + "/" 
  6.       + Util.formatSize( RUNTIME.totalMemory() ) + "/" 
  7.       + Util.formatSize( RUNTIME.maxMemory() ) : "" );
  8. }

代码示例来源：origin: blazegraph/database

  1. /** Ensures that Log4J is configured, by invoking, if necessary,
  2.  * {@link org.apache.log4j.BasicConfigurator#configure()}, and
  3.  * setting the root logger level to a specified logging level.
  4.  * 
  5.  * @param level the required logging level.
  6.  */
  8. public static void ensureLog4JIsConfigured( final Level level ) {
  9.   ensureLog4JIsConfigured( null, level );
  10. }

代码示例来源：origin: it.unimi.dsi/webgraph

  1. /**
  2.  * Renumbers by decreasing size the components of this set.
  3.  *
  4.  * <p>After a call to this method, both the internal status of this class and the argument array
  5.  * are permuted so that the sizes of connected components are decreasing in the component index.
  6.  *
  7.  * @param size the components sizes, as returned by {@link #computeSizes()}.
  8.  */
  9. public void sortBySize(final int[] size) {
  10.   final int[] perm = Util.identity(size.length);
  11.   IntArrays.parallelRadixSortIndirect(perm, size, false);
  12.   IntArrays.reverse(perm);
  13.   final int[] copy = size.clone();
  14.   for (int i = size.length; i-- != 0;)
  15.     size[i] = copy[perm[i]];
  16.   Util.invertPermutationInPlace(perm);
  17.   for (int i = component.length; i-- != 0;)
  18.     component[i] = perm[component[i]];
  19. }

代码示例来源：origin: blazegraph/database

  1. /** Formats a size.
  2.  *
  3.  * <P>This method formats a long using suitable unit multipliers (e.g., <samp>K</samp>, <samp>M</samp>, <samp>G</samp>, and <samp>T</samp>)
  4.  * and printing just two fractional digits.
  5.  * @param l a number, representing a size (e.g., memory).
  6.  * @return a string containing a pretty print of the number using unit multipliers.
  7.  */
  8. public static String formatSize( final long l ) {
  9.   if ( l >= 1000000000000L ) return format( l / 1000000000000.0 ) + "T";
  10.   if ( l >= 1000000000L ) return format( l / 1000000000.0 ) + "G";
  11.   if ( l >= 1000000L ) return format( l / 1000000.0 ) + "M";
  12.   if ( l >= 1000L ) return format( l / 1000.0 ) + "K";
  13.   return Long.toString( l );
  14. }

代码示例来源：origin: it.unimi.di/mg4j

  1. if ( ( documentPointer & 0xFF ) == 0 ) {
  2.   percAvailableMemory = Util.percAvailableMemory();
  3.   if ( ! outOfMemoryError && percAvailableMemory < PERC_AVAILABLE_MEMORY_CHECK ) {
  4.     LOGGER.info( "Starting compaction... (" + percAvailableMemory + "% available)" );
  5.     compacted = true;
  6.     Util.compactMemory();
  7.     percAvailableMemory = Util.percAvailableMemory();
  8.     LOGGER.info( "Compaction completed (" + percAvailableMemory + "% available)" );
  9.   LOGGER.info( "Last set of batches indexed at " + Util.format( ( 1000. * occurrences ) / ( System.currentTimeMillis() - batchStartTime ) ) + " occurrences/s" );
  10.   batchStartTime = System.currentTimeMillis();
  11.   documentsInBatch = 0;

代码示例来源：origin: it.unimi.di/mg4j-big

  1. private static String format( long v, long total ) {
  2.   return v + " (" + Util.formatSize( v / 8 ) + "B, " + Util.format( 100. * v / total ) + "%)\n";
  3. }

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