3x Five Minute Runs on work with 5.2-wl86 key cache partitions on and off

MariDB 5.2-wl86 sysbench benchmark comparison with key_cache_partitions off and 7 in %

Each test was run three times for 5 minutes.

                   Number of threads
                     1       4       8       16      32      64      128
 sysbench test
  delete            -18.36  -20.66  -11.32    5.42   -2.91  -14.62   -3.47
  insert             -2.38  -30.11   -1.64   -0.98   -1.19    0.12   -2.37
  oltp_complex_ro     0.16    2.61    4.03    2.99    3.10    5.73   20.95
  oltp_complex_rw   Dup key errors (due to sysbench)
  oltp_simple        -1.24    1.86   11.14   10.69   16.11   17.16   14.31
  select             -0.22    2.00   11.42   10.31   15.58   17.10   14.31
  update_index       -9.34   15.75   -0.36  -10.33    1.94    2.44   41.44
  update_non_index    0.73    1.04   11.12   17.32    5.30   -0.24   -9.55

 (MariaDB 5.2-wl86 key_cache_partitions off q/s /
  MariaDB 5.2-wl86 key_cache_partitions=7 q/s * 100)

key_buffer_size = 32M

Benchmark was run on work: Linux openSUSE 11.1 (x86_64), daul socket quad-core Intel 3.0GHz. with 6MB L2 cache, 8 GB RAM, data_dir on single disk.

MariaDB and MySQL were compiled with

BUILD/compile-amd64-max

MariaDB revision was:

lp:~maria-captains/maria/maria-5.2-wl86

revno: 2742
committer: Igor Babaev <[email protected]>
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 mio rows
--max-time=300 \
--max-requests=0 \
--mysql-table-engine=MyISAM \
--mysql-user=root \
--mysql-engine-trx=no \
--myisam-max-rows=50000000"

and this variable part of parameters

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

Configuration used for MariDB:

--no-defaults \
--datadir=$DATA_DIR \
--language=./sql/share/english \
--key_buffer_size=32M \
--max_connections=256 \
--query_cache_size=0 \
--query_cache_type=0 \
--skip-grant-tables \
--socket=$MY_SOCKET \
--table_open_cache=512 \
--thread_cache=512 \
--tmpdir=$TEMP_DIR"
#  --key_cache_partitions=7 \