Added back sql-bench directory, so that one can more easily run benchmarks on a server and add new benchmarks for new optimizations

Fixed memory leak in _db_set() (Bug#24497 Valgrind warning: get_one_option)
Don't call net_clear() on COM_QUIT. This avoids a warning from net_clear() after shutdown: "skipped ## bytes from file"
BUG#21428: skipped 9 bytes from file: socket (3)" on "mysqladmin shutdown"

sql-bench/Comments/postgres.benchmark

@@ -0,0 +1,107 @@
+# This file describes how to run MySQL benchmark suite with PostgreSQL
+#
+# WARNING:
+#
+# Don't run the --fast test on a PostgreSQL 7.1.1 database on
+# which you have any critical data; During one of our test runs
+# PostgreSQL got a corrupted database and all data was destroyed!
+# When we tried to restart postmaster, It died with a
+# 'no such file or directory' error and never recovered from that!
+#
+# Another time vacuum() filled our system disk with had 6G free
+# while vaccuming a table of 60 M.
+#
+# WARNING
+
+# The test was run on a Intel Xeon 2x 550 Mzh machine with 1G memory,
+# 9G hard disk.  The OS is Suse 7.1, with Linux 2.4.2 compiled with SMP
+# support
+# Both the perl client and the database server is run
+# on the same machine. No other cpu intensive process was used during
+# the benchmark.
+#
+# During the test we run PostgreSQL with -o -F, not async mode (not ACID safe)
+# because when we started postmaster without -o -F, PostgreSQL log files
+# filled up a 9G disk until postmaster crashed.
+# We did however notice that with -o -F, PostgreSQL was a magnitude slower
+# than when not using -o -F.
+
+#
+# First, install postgresql-7.1.2.tar.gz
+
+# Adding the following lines to your ~/.bash_profile or
+# corresponding file. If you are using csh, use <20>setenv<6E>.
+
+export POSTGRES_INCLUDE=/usr/local/pg/include
+export POSTGRES_LIB=/usr/local/pg/lib
+
+PATH=$PATH:/usr/local/pg/bin
+MANPATH=$MANPATH:/usr/local/pg/man
+
+#
+# Add the following line to /etc/ld.so.conf:
+#
+
+/usr/local/pg/lib
+
+# and run:
+
+ldconfig
+
+# untar the postgres source distribution,  cd to postgresql-*
+# and run the following commands:
+
+CFLAGS=-O3 ./configure
+gmake
+gmake install
+
+mkdir /usr/local/pg/data
+chown postgres /usr/local/pg/data
+su - postgres
+/usr/local/pg/bin/initdb -D /usr/local/pg/data
+/usr/local/pg/bin/postmaster -o -F -D /usr/local/pg/data &
+/usr/local/pg/bin/createdb test
+exit
+
+#
+# Second, install packages DBD-Pg-1.00.tar.gz and DBI-1.18.tar.gz,
+# available from http://www.perl.com/CPAN/
+
+export POSTGRES_LIB=/usr/local/pg/lib/
+export POSTGRES_INCLUDE=/usr/local/pg/include/postgresql
+perl Makefile.PL
+make
+make install
+
+#
+# Now we run the test that can be found in the sql-bench directory in the
+# MySQL 3.23 source distribution.
+#
+# We did run two tests:
+# The standard test
+
+run-all-tests --comment="Intel Xeon, 2x550 Mhz, 512M, pg started with -o -F" --user=postgres --server=pg --cmp=mysql
+
+# When running with --fast we run the following vacuum commands on
+# the database between each major update of the tables:
+# vacuum anlyze table
+# vacuum table
+# or
+# vacuum analyze
+# vacuum
+
+# The time for vacuum() is accounted for in the book-keeping() column, not
+# in the test that updates the database.
+
+run-all-tests --comment="Intel Xeon, 2x550 Mhz, 512M, pg started with -o -F" --user=postgres --server=pg --cmp=mysql --fast
+
+# If you want to store the results in a output/RUN-xxx file, you should
+# repeate the benchmark with the extra option --log --use-old-result
+# This will create a the RUN file based of the previous results
+
+run-all-tests --comment="Intel Xeon, 2x550 Mhz, 512M, pg started with -o -F" --user=postgres --server=pg --cmp=mysql --log --use-old-result
+run-all-tests --comment="Intel Xeon, 2x550 Mhz, 512MG, pg started with -o -F" --user=postgres --server=pg --cmp=mysql --fast --log --use-old-result
+
+# Between running the different tests we dropped and recreated the PostgreSQL
+# database to ensure that PostgreSQL should get a clean start,
+# independent of the previous runs.