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MDEV-20907 Set innodb_log_files_in_group=1 by default

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Historically, InnoDB split the redo log into at least 2 files.
MDEV-12061 allowed the minimum to be innodb_log_files_in_group=1,
but it kept the default at innodb_log_files_in_group=2.

Because performance seems to be slightly better with only one log file,
and because implementing an append-only variant of the log would require
a single file, let us define the default to be 1, and have
innodb_log_file_size=96M, to retain the same default total size.
This commit is contained in:
Marko Mäkelä
2019-10-28 17:11:10 +02:00
parent 3043f38436
commit 613e9e7d4d
24 changed files with 59 additions and 66 deletions
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sql-bench/example
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@ -6,9 +6,9 @@ machine="Linux-x64"
# InnoDB tests
./run-all-tests --suffix=-innodb --comments="Engine=InnoDB --innodb_buffer_pool_size=256M --innodb_log_file_size=1000M --innodb_log_buffer_size=16M --innodb_lock_wait_timeout=50 --innodb_flush_log_at_trx_commit=1 --innodb_flush_method=O_DIRECT --innodb_log_files_in_group=2 --skip-innodb-doublewrite" --create-options="ENGINE=InnoDB" --hw="$hw" --optimization="$optimization" --machine="$machine" --log
./run-all-tests --suffix=-innodb --comments="Engine=InnoDB --innodb_buffer_pool_size=256M --innodb_log_file_size=2000M --innodb_log_buffer_size=16M --innodb_lock_wait_timeout=50 --innodb_flush_log_at_trx_commit=1 --innodb_flush_method=O_DIRECT --innodb_log_files_in_group=1 --skip-innodb-doublewrite" --create-options="ENGINE=InnoDB" --hw="$hw" --optimization="$optimization" --machine="$machine" --log
./run-all-tests --suffix=_fast-innodb --comments="Engine=InnoDB --innodb_buffer_pool_size=256M --innodb_log_file_size=1000M --innodb_log_buffer_size=16M --innodb_lock_wait_timeout=50 --innodb_flush_log_at_trx_commit=1 --innodb_flush_method=O_DIRECT --innodb_log_files_in_group=2 --skip-innodb-doublewrite" --create-options="ENGINE=InnoDB" --hw="$hw" --optimization="$optimization" --machine="$machine" --fast --log
./run-all-tests --suffix=_fast-innodb --comments="Engine=InnoDB --innodb_buffer_pool_size=256M --innodb_log_file_size=2000M --innodb_log_buffer_size=16M --innodb_lock_wait_timeout=50 --innodb_flush_log_at_trx_commit=1 --innodb_flush_method=O_DIRECT --innodb_log_files_in_group=1 --skip-innodb-doublewrite" --create-options="ENGINE=InnoDB" --hw="$hw" --optimization="$optimization" --machine="$machine" --fast --log
# MyISAM tests