sysbench v0.5 - 3x 15 Minute Runs on perro with 5.2-wl86 a

sysbench v0.5 - 3x 15 Minute Runs on perro with 5.2-wl86 key cache partitions off, 8, and 32 and key buffer size 400

MariDB sysbench benchmark comparison for key_cache_partitions in % with key_buffer_size = 400MB

Each test was run 3 times for 15 minutes with 3 minutes warmup.

                   Number of threads
                     1       4       8       16      32      64      128
 sysbench test
  oltp_complex_ro
      8 / off        -0.78   -0.42   -0.18   -0.49   -1.03   -0.64    1.08
     32 / off        -0.38   -0.30    0.55   -0.39   -0.75   -0.05    2.49
  oltp_simple
      8 / off        -1.19   -2.20   -0.74   -2.74   -1.54    0.28   -1.46
     32 / off        -1.24   -1.22    0.33   -0.13    0.11    2.09   -1.34
  select
      8 / off        -0.71   -1.68   -1.48   -2.05    0.94   -2.93   -0.18
     32 / off        -0.71   -1.33   -2.11   -0.63   -0.40  -19.68* -11.45*
  update_index
      8 / off        -1.30    4.37  -14.69*  -2.56   17.69*  -1.14    2.82
     32 / off        -1.47    7.03*   0.71   -0.72   15.61*   1.61    0.33

 ( 8/off*100)-100
 (32/off*100)-100

 * means due to unusual high STDEV (see OO.org spreadsheet for details)

 off means key_cache_partitions off
   8 means key_cache_partitions = 8
  32 means key_cache_partitions = 32

Benchmark was run on perro: Linux openSUSE 11.1 (x86_64), single socket dual-core Intel 3.2GHz. with 1MB L2 cache, 2GB RAM, data_dir on 2 disk software RAID 0

MariaDB and MySQL were compiled with

BUILD/compile-amd64-max

MariaDB revision was:

revno: 2742
committer: Igor Babaev <igor@askmonty.org>
branch nick: maria-5.2-keycache
timestamp: Tue 2010-02-16 08:41:11 -0800
message:
  WL#86: Partitioned key cache for MyISAM.
  This is the base patch for the task.

sysbench was run with the following parameters:

--oltp-table-size=20000000 \       # 20 million rows.
--max-requests=0 \
--mysql-table-engine=MyISAM \
--mysql-user=root \
--mysql-engine-trx=no \
--myisam-max-rows=50000000 \
--rand-seed=303

and these variable parameters:

--num-threads=$THREADS --test=${TEST_DIR}/${SYSBENCH_TEST}

Configuration used for MariaDB:

--no-defaults \
--datadir=/mnt/data/sysbench/data \
--language=./sql/share/english \
--key_buffer_size=400M \
--key_cache_partitions=32 \        # Off | 8 | 32
--max_connections=256 \
--query_cache_size=0 \
--query_cache_type=0 \
--skip-grant-tables \
--socket=/tmp/mysql.sock \
--table_open_cache=512 \
--thread_cache=512 \
--tmpdir=/mnt/data/sysbench