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

3x 15 Minute Runs on perro with 5.2-wl86 key cache partitions off, 8, and 32 and key buffer size 75

MariDB sysbench benchmark comparison for key_cache_partitions in % with key_buffer_size = 75MB

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        3.05   -0.10    0.57    1.00   -0.05    0.15    2.50
     32 / off        3.04  -26.61*   0.89   -0.02    1.03    0.44    2.94
  oltp_simple
      8 / off       -0.95   -1.10   -1.17    1.36   -2.65   -0.59   -1.01
     32 / off        0.76   -0.02    0.66    2.75    1.96    3.05   -0.86
  select
      8 / off       -1.45   -0.68   -2.31  -27.61*  -0.52   -3.97   -0.24
     32 / off       -0.87   -1.63   -1.15   -2.10    0.44    1.12    1.39
  update_index
      8 / off       -2.55    8.29*   3.14    4.16    1.13    1.95    1.29
     32 / off       -2.27    9.46*  -0.12    2.64    0.69   -7.26*  -0.24
 
 ( 8/off*100)-100
 (32/off*100)-100
 
 * means unusually high STDEV

 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 the following variable parameters

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

Configuration used for MariDB:

--no-defaults \
--datadir=/mnt/data/sysbench/data \
--language=./sql/share/english \
--key_buffer_size=75M \
--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