InnoDB must flush the log to disk at each transaction commit if that transaction made modifications to the database. ... constrains the number of commits to the same 167th of a second

unless you set innodb_flush_log_at_trx_commit to 0, which switches it to flush once a second.
http://dev.mysql.com/doc/refman/5.0/en/innodb-parameters.html

HTH, andye

In reply to Re^2: Perl solution for storage of large number of small files by andye
in thread Perl solution for storage of large number of small files by isync

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