message: docs: add more benchmark
diff: @@ -43,8 +43,7 @@ public class Benchmark
  // build a new database by a RDF file.
  // note that the relative path is related to gserver.
  - //gc.load("lubm");
  - gc.load("dbpedia");
  + gc.load("lubm");
  //TODO: use multithreading to send queries and output results
  String[] spq = new String[6];
  @@ -54,13 +53,15 @@ public class Benchmark
  spq[3] = "select ?x where { ?x <rdf:type> <ub:UndergraduateStudent>. ?y <ub:name> <Course1>. ?x <ub:takesCourse> ?y. ?z <ub:teacherOf> ?y. ?z <ub:name> <FullProfessor1>. ?z <ub:worksFor> ?w. ?w <ub:name> <Department0>. }";
  spq[4] = "select distinct ?x where { ?x <rdf:type> <ub:UndergraduateStudent>. }";
  spq[5] = "select ?s ?o where { ?s ?p ?o . }";
  - MyThread[] qt = new MyThread[6];
  - for(int i = 0; i < 6; ++i)
  + //int tnum = 6;
  + int tnum = 1200;
  + MyThread[] qt = new MyThread[tnum];
  + for(int i = 0; i < tnum; ++i)
  {
  - qt[i] = new MyThread(i, gc, spq[i]);
  + qt[i] = new MyThread(i, gc, spq[i%6]);
  qt[i].start();
  }
  - for(int i = 0; i < 6; ++i)
  + for(int i = 0; i < tnum; ++i)
  {
  try {
  qt[i].join();
  @@ -77,8 +78,7 @@ public class Benchmark
  //e.printStackTrace();
  //}
  // unload this database.
  - //gc.unload("lubm");
  - gc.unload("dbpedia");
  + gc.unload("lubm");
  // also, you can load some exist database directly and then query.
  