We follow your advice, our goal is improve the quality of the solution
and we made it,however the total query execution time is higher.
Regards.
On 05/27/2015 04:36 PM, Tom Lane wrote:
boix b...@uclv.cu writes:
Hello, my partner and me are working with the goal of improve the GEQO's
performance, we tried with Ant Colony Optimization, but it does not
improve, actually we are trying with a new variant of Genetic Algorithm,
specifically Micro-GA. This algorithm finds a better solution than GEQO
in less time, however the total query execution time is higher. The
fitness is calculated by geqo_eval function. Does anybody know why this
happens?
Well, for one thing, you can't just do this:
+ aux = aux1;
without totally confusing all your subsequent steps.
You'd want to copy the pointed-to data, likely, not the pointer.
regards, tom lane
diff --git a/contrib/Makefile b/contrib/Makefile
index d230451..df9ccef 100755
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -26,6 +26,7 @@ SUBDIRS = \
isn \
lo \
ltree \
+ microg \
oid2name \
pageinspect \
passwordcheck \
diff --git a/contrib/microg/Makefile b/contrib/microg/Makefile
new file mode 100644
index 000..7597ede
--- /dev/null
+++ b/contrib/microg/Makefile
@@ -0,0 +1,25 @@
+#-
+#
+# Makefile--
+#Makefile for the genetic query optimizer module
+#
+# Copyright (c) 2015, Universidad Central Marta Abreu de Las Villas
+#
+# contrib/microg/Makefile
+#
+#-
+
+MODULE_big = microg
+OBJS = microg_main.o
+
+
+ifdef USE_PGXS
+PG_CONFIG = pg_config
+PGXS := $(shell $(PG_CONFIG) --pgxs)
+include $(PGXS)
+else
+subdir = contrib/microg
+top_builddir = ../..
+include $(top_builddir)/src/Makefile.global
+include $(top_srcdir)/contrib/contrib-global.mk
+endif
diff --git a/contrib/microg/microg_main.c b/contrib/microg/microg_main.c
new file mode 100644
index 000..f71a0be
--- /dev/null
+++ b/contrib/microg/microg_main.c
@@ -0,0 +1,445 @@
+/*
+ *
+ * microg_main.c
+ * solution to the query optimization problem
+ * by means of a Micro Genetic Algorithm (micro-GA)
+ *
+ * Portions Copyright (c) 2014-2015, PostgreSQL Global Development Group
+ * Portions Copyright (c) 2015, Universidad Central de Las Villas
+ *
+ * contrib/microg_main.c
+ *
+ *-
+ */
+
+/* contributed by:
+ =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
+ * Martin Utesch * Institute of Automatic Control *
+ = = University of Mining and Technology =
+ * ute...@aut.tu-freiberg.de * Freiberg, Germany *
+ =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
+ * Laura Perez Triana
+ * Centro de Estudios Informaticos
+ *== Universidad Central de Las Villas =* ltri...@uclv.cu *Villa Clara, Cuba
+ =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
+ * Alegandro G. Gomez Boix
+ * Centro de Estudios Informaticos
+ *== Universidad Central de Las Villas =* b...@uclv.cu *Villa Clara, Cuba
+ */
+
+/* -- parts of this are adapted from D. Whitley's Genitor algorithm -- */
+
+#include postgres.h
+
+#include math.h
+
+#include optimizer/geqo_misc.h
+#include optimizer/geqo_mutation.h
+#include optimizer/geqo_pool.h
+#include optimizer/geqo_random.h
+#include optimizer/geqo_selection.h
+#include optimizer/geqo_gene.h
+#include optimizer/paths.h
+#include sys/timeb.h
+#include fmgr.h
+
+PG_MODULE_MAGIC
+;
+
+/*
+ * Configuration options
+ */
+int Geqo_effort;
+int Geqo_pool_size;
+int Geqo_generations;
+double Geqo_selection_bias;
+double Geqo_seed;
+
+join_search_hook_type join_search_hook = NULL;
+
+void _PG_init(void);
+void _PG_fini(void);
+
+/* new functions of microg */
+void random_init_poolMG(PlannerInfo *root, Pool *pool);
+int meanCommonEdgeInPool(Chromosome *pool, int pool_size, int number_of_rels);
+int existEdge(Gene a, Gene b, Gene* s2, int lenght);
+int commonEdge(Gene* s1, Gene* s2, int number_of_rels);
+Chromosome * localSerch2_opt(PlannerInfo *root, Gene* solution, int sizeProblem);
+RelOptInfo *microg(PlannerInfo *root, int number_of_rels, List *initial_rels);
+
+/* define edge recombination crossover [ERX] per default */
+#if !defined(ERX) \
+ !defined(PMX) \
+ !defined(CX) \
+ !defined(PX) \
+ !defined(OX1) \
+ !defined(OX2)
+#define ERX
+#endif
+
+/*
+ * microg
+ * solution of the query optimization problem
+ * similar to a constrained Traveling Salesman Problem (TSP)
+ */
+
+RelOptInfo *
+microg(PlannerInfo *root, int number_of_rels, List *initial_rels) {
+ GeqoPrivateData private;
+ int generation;
+ Chromosome *momma;
+ Chromosome *daddy;
+ Chromosome *kid, *result;
+ Pool *pool;
+ int pool_size, number_generations;
+
+ struct
