Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 package com.sun.tools.sjavac;

 import java.net.URI;

 import java.util.Arrays;

 import java.util.Random;

 import java.util.Set;

 import java.util.Map;

 import com.sun.tools.sjavac.server.JavacServer;

 import com.sun.tools.sjavac.server.SysInfo;

 import java.io.PrintStream;

 /**

  * This transform compiles a set of packages containing Java sources.

  * The compile request is divided into separate sets of source files.

  * For each set a separate request thread is dispatched to a javac server

  * and the meta data is accumulated. The number of sets correspond more or

  * less to the number of cores. Less so now, than it will in the future.

  *

  * <p><b>This is NOT part of any supported API.

  * If you write code that depends on this, you do so at your own

  * risk.  This code and its internal interfaces are subject to change

  * or deletion without notice.</b></p>

  */

 public class CompileJavaPackages implements Transformer {

     // The current limited sharing of data between concurrent JavaCompilers

     // in the server will not give speedups above 3 cores. Thus this limit.

     // We hope to improve this in the future.

     final static int limitOnConcurrency = 3;

     String serverSettings;

     public void setExtra(String e) {

         serverSettings = e;

     }

     String[] args;

     public void setExtra(String[] a) {

         args = a;

     }

     public boolean transform(Map<String,Set<URI>> pkgSrcs,

                              Set<URI>             visibleSources,

                              Map<URI,Set<String>> visibleClasses,

                              Map<String,Set<String>> oldPackageDependents,

                              URI destRoot,

                              final Map<String,Set<URI>>    packageArtifacts,

                              final Map<String,Set<String>> packageDependencies,

                              final Map<String,String>      packagePubapis,

                              int debugLevel,

                              boolean incremental,

                              int numCores,

                              PrintStream out,

                              PrintStream err)

     {

         boolean rc = true;

         boolean concurrentCompiles = true;

         // Fetch the id.

         String id = Util.extractStringOption("id", serverSettings);

         if (id == null || id.equals("")) {

             // No explicit id set. Create a random id so that the requests can be

             // grouped properly in the server.

             id = "id"+(((new Random()).nextLong())&Long.MAX_VALUE);

         }

         // Only keep portfile and sjavac settings..

         String psServerSettings = Util.cleanSubOptions("--server:", Util.set("portfile","sjavac","background","keepalive"), serverSettings);

         // Get maximum heap size from the server!

         SysInfo sysinfo = JavacServer.connectGetSysInfo(psServerSettings, out, err);

         if (sysinfo.numCores == -1) {

             Log.error("Could not query server for sysinfo!");

             return false;

         }

         int numMBytes = (int)(sysinfo.maxMemory / ((long)(1024*1024)));

         Log.debug("Server reports "+numMBytes+"MiB of memory and "+sysinfo.numCores+" cores");

         if (numCores <= 0) {

             // Set the requested number of cores to the number of cores on the server.

             numCores = sysinfo.numCores;

             Log.debug("Number of jobs not explicitly set, defaulting to "+sysinfo.numCores);

         } else if (sysinfo.numCores < numCores) {

             // Set the requested number of cores to the number of cores on the server.

             Log.debug("Limiting jobs from explicitly set "+numCores+" to cores available on server: "+sysinfo.numCores);

             numCores = sysinfo.numCores;

         } else {

             Log.debug("Number of jobs explicitly set to "+numCores);

         }

         // More than three concurrent cores does not currently give a speedup, at least for compiling the jdk

         // in the OpenJDK. This will change in the future.

         int numCompiles = numCores;

         if (numCores > limitOnConcurrency) numCompiles = limitOnConcurrency;

         // Split the work up in chunks to compiled.

         int numSources = 0;

         for (String s : pkgSrcs.keySet()) {

             Set<URI> ss = pkgSrcs.get(s);

             numSources += ss.size();

         }

         int sourcesPerCompile = numSources / numCompiles;

         // For 64 bit Java, it seems we can compile the OpenJDK 8800 files with a 1500M of heap

         // in a single chunk, with reasonable performance.

         // For 32 bit java, it seems we need 1G of heap.

         // Number experimentally determined when compiling the OpenJDK.

         // Includes space for reasonably efficient garbage collection etc,

         // Calculating backwards gives us a requirement of

         // 1500M/8800 = 175 KiB for 64 bit platforms

         // and 1G/8800 = 119 KiB for 32 bit platform

         // for each compile.....

         int kbPerFile = 175;

         String osarch = System.getProperty("os.arch");

         if (osarch.equals("i386")) {

             // For 32 bit platforms, assume it is slightly smaller

             // because of smaller object headers and pointers.

             kbPerFile = 119;

         }

         int numRequiredMBytes = (kbPerFile*numSources)/1024;

         Log.debug("For os.arch "+osarch+" the empirically determined heap required per file is "+kbPerFile+"KiB");

         Log.debug("Server has "+numMBytes+"MiB of heap.");

         Log.debug("Heuristics say that we need "+numRequiredMBytes+"MiB of heap for all source files.");

         // Perform heuristics to see how many cores we can use,

         // or if we have to the work serially in smaller chunks.

         if (numMBytes < numRequiredMBytes) {

             // Ouch, cannot fit even a single compile into the heap.

             // Split it up into several serial chunks.

             concurrentCompiles = false;

             // Limit the number of sources for each compile to 500.

             if (numSources < 500) {

                 numCompiles = 1;

                 sourcesPerCompile = numSources;

                 Log.debug("Compiling as a single source code chunk to stay within heap size limitations!");

             } else if (sourcesPerCompile > 500) {

                 // This number is very low, and tuned to dealing with the OpenJDK

                 // where the source is >very< circular! In normal application,

                 // with less circularity the number could perhaps be increased.

                 numCompiles = numSources / 500;

                 sourcesPerCompile = numSources/numCompiles;

                 Log.debug("Compiling source as "+numCompiles+" code chunks serially to stay within heap size limitations!");

             }

         } else {

             if (numCompiles > 1) {

                 // Ok, we can fit at least one full compilation on the heap.

                 float usagePerCompile = (float)numRequiredMBytes / ((float)numCompiles * (float)0.7);

                 int usage = (int)(usagePerCompile * (float)numCompiles);

                 Log.debug("Heuristics say that for "+numCompiles+" concurrent compiles we need "+usage+"MiB");

                 if (usage > numMBytes) {

                     // Ouch it does not fit. Reduce to a single chunk.

                     numCompiles = 1;

                     sourcesPerCompile = numSources;

                     // What if the relationship betweem number of compile_chunks and num_required_mbytes

                     // is not linear? Then perhaps 2 chunks would fit where 3 does not. Well, this is

                     // something to experiment upon in the future.

                     Log.debug("Limiting compile to a single thread to stay within heap size limitations!");

                 }

             }

         }

         Log.debug("Compiling sources in "+numCompiles+" chunk(s)");

         // Create the chunks to be compiled.

         final CompileChunk[] compileChunks = createCompileChunks(pkgSrcs, oldPackageDependents,

                 numCompiles, sourcesPerCompile);

         if (Log.isDebugging()) {

             int cn = 1;

             for (CompileChunk cc : compileChunks) {

                 Log.debug("Chunk "+cn+" for "+id+" ---------------");

                 cn++;

                 for (URI u : cc.srcs) {

                     Log.debug(""+u);

                 }

             }

         }

         // The return values for each chunked compile.

         final int[] rn = new int[numCompiles];

         // The requets, might or might not run as a background thread.

         final Thread[] requests  = new Thread[numCompiles];

         final Set<URI>             fvisible_sources = visibleSources;

         final Map<URI,Set<String>> fvisible_classes = visibleClasses;

         long start = System.currentTimeMillis();

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

             final int ii = i;

             final CompileChunk cc = compileChunks[i];

             // Pass the num_cores and the id (appended with the chunk number) to the server.

             final String cleanedServerSettings = psServerSettings+",poolsize="+numCores+",id="+id+"-"+ii;

             final PrintStream fout = out;

             final PrintStream ferr = err;

             requests[ii] = new Thread() {

                 @Override

                 public void run() {

                                         rn[ii] = JavacServer.useServer(cleanedServerSettings,

                                                            Main.removeWrapperArgs(args),

                                                                cc.srcs,

                                                            fvisible_sources,

                                                            fvisible_classes,

                                                            packageArtifacts,

                                                            packageDependencies,

                                                            packagePubapis,

                                                            null,

                                                            fout, ferr);

                 }

             };

             if (cc.srcs.size() > 0) {

                 String numdeps = "";

                 if (cc.numDependents > 0) numdeps = "(with "+cc.numDependents+" dependents) ";

                 if (!incremental || cc.numPackages > 16) {

                     String info = "("+cc.pkgFromTos+")";

                     if (info.equals("( to )")) {

                         info = "";

                     }

                     Log.info("Compiling "+cc.srcs.size()+" files "+numdeps+"in "+cc.numPackages+" packages "+info);

                 } else {

                     Log.info("Compiling "+cc.pkgNames+numdeps);

                 }

                 if (concurrentCompiles) {

                     requests[ii].start();

                 }

                 else {

                     requests[ii].run();

                     // If there was an error, then stop early when running single threaded.

                     if (rn[i] != 0) {

                         return false;

                     }

                 }

             }

         }

         if (concurrentCompiles) {

             // If there are background threads for the concurrent compiles, then join them.

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

                 try { requests[i].join(); } catch (InterruptedException e) { }

             }

         }

         // Check the return values.

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

             if (compileChunks[i].srcs.size() > 0) {

                 if (rn[i] != 0) {

                     rc = false;

                 }

             }

         }

         long duration = System.currentTimeMillis() - start;

         long minutes = duration/60000;

         long seconds = (duration-minutes*60000)/1000;

         Log.debug("Compilation of "+numSources+" source files took "+minutes+"m "+seconds+"s");

         return rc;

     }

     /**

      * Split up the sources into compile chunks. If old package dependents information

      * is available, sort the order of the chunks into the most dependent first!

      * (Typically that chunk contains the java.lang package.) In the future

      * we could perhaps improve the heuristics to put the sources into even more sensible chunks.

      * Now the package are simple sorted in alphabetical order and chunked, then the chunks

      * are sorted on how dependent they are.

      *

      * @param pkgSrcs The sources to compile.

      * @param oldPackageDependents Old package dependents, if non-empty, used to sort the chunks.

      * @param numCompiles The number of chunks.

      * @param sourcesPerCompile The number of sources per chunk.

      * @return

      */

     CompileChunk[] createCompileChunks(Map<String,Set<URI>> pkgSrcs,

                                  Map<String,Set<String>> oldPackageDependents,

                                  int numCompiles,

                                  int sourcesPerCompile) {

         CompileChunk[] compileChunks = new CompileChunk[numCompiles];

         for (int i=0; i<compileChunks.length; ++i) {

             compileChunks[i] = new CompileChunk();

         }

         // Now go through the packages and spread out the source on the different chunks.

         int ci = 0;

         // Sort the packages

         String[] packageNames = pkgSrcs.keySet().toArray(new String[0]);

         Arrays.sort(packageNames);

         String from = null;

         for (String pkgName : packageNames) {

             CompileChunk cc = compileChunks[ci];

             Set<URI> s = pkgSrcs.get(pkgName);

             if (cc.srcs.size()+s.size() > sourcesPerCompile && ci < numCompiles-1) {

                 from = null;

                 ci++;

                 cc = compileChunks[ci];

             }

             cc.numPackages++;

             cc.srcs.addAll(s);

             // Calculate nice package names to use as information when compiling.

             String justPkgName = Util.justPackageName(pkgName);

             // Fetch how many packages depend on this package from the old build state.

             Set<String> ss = oldPackageDependents.get(pkgName);

             if (ss != null) {

                 // Accumulate this information onto this chunk.

                 cc.numDependents += ss.size();

             }

             if (from == null || from.trim().equals("")) from = justPkgName;

             cc.pkgNames.append(justPkgName+"("+s.size()+") ");

             cc.pkgFromTos = from+" to "+justPkgName;

         }

         // If we are compiling serially, sort the chunks, so that the chunk (with the most dependents) (usually the chunk

         // containing java.lang.Object, is to be compiled first!

         // For concurrent compilation, this does not matter.

         Arrays.sort(compileChunks);

         return compileChunks;

     }

 }