…_buffer_pool_instances = 4 innodb_adaptive_flushing = 1 innodb_adaptive_flushing_method = estimate innodb_flush_log_at_trx_commit = 2 innodb_flush_method = O_DIRECT innodb…. The “estimate” method reduces the impact of traditional InnoDB log flushing, which can cause downward spikes in performance. Other then that…
Post: Percona Server vs MySQL on Intel 320 SSD
February 23, 2012 By 21 Comments
… flushing algorithm Disable flushing of neighbor pages and the configuration to provide better experience on SSD is : innodb_flush_neighbor_pages = 0 innodb_adaptive_flushing…
Comment: Percona Server vs MySQL on Intel 320 SSD
February 23, 2012 By 21 Comments
… problem could be in default “innodb_adaptive_checkpoint=estimate” It performs much more work than “innodb_adaptive_checkpoint=keep_average” and in…, because it does more operations in flushing. Probably it will be good idea to change “innodb_adaptive_checkpoint=keep_average” to be…
Post: Troubleshooting MySQL Memory Usage
March 21, 2012 By 3 Comments
… see “VSZ” going down. What you might see instead is flushing tables regularly or reducing table cache reduces memory consumption to… pool allocated 0 Internal hash tables (constant factor + variable factor) Adaptive hash index 4422068288 (2039977928 + 2382090360) Page hash 127499384 Dictionary cache…
Post: Effect of adaptive_flushing
December 4, 2009 By 5 Comments
… Modified db pages 457902 Log flushed up to 10026890404067 Last checkpoint at 10024612103454 …. We enabled innodb_adaptive_flushing just before 10am, which resulted… of rows. Here we can see the “spiky flushing” before 10am (when adaptive flushing was off), which can be very bad for performance…
Post: Which adaptive should we use?
September 15, 2009 By 14 Comments
… innodb_flush_method = O_DIRECT innodb_thread_concurrency = 0 innodb_ibuf_active_contract = 1
Post: MySQL 5.5.8 and Percona Server: being adaptive
December 20, 2010 By 25 Comments
…_files_in_group=2), and innodb_flush_log_at_trx_commit=2. Also, innodb_adaptive_flushing (ON) / innodb_adaptive_checkpoint (estimate) were the default… existing adaptive_checkpoint or adaptive_flushing algorithms. So, Yasufumi invested a lot of research time and came up with the new innodb_adaptive_checkpoint…
Post: InnoDB Flushing: a lot of memory and slow disk
March 31, 2011 By 57 Comments
… is that, unfortunately, none of the existing flushing implementations (including both MySQL native adaptive flushing and that in Percona Server) can handle it… innodb_adaptive_flushing is not able to keep up. What if we disable flushing of neighbor pages (we have the option innodb_flush_neighbor…
Post: Why delayed flushing can result in less work
December 9, 2009 By 5 Comments
… recent post on InnoDB adaptive flushing asked, That’s really interesting stuff; am I reading it correctly though that adaptive flush actually increased the… and average IO rate were higher with adaptive flush nabled (assuming I’m reading properly). Yes. Adaptive flushing actually increased the overall number of…
Post: Different flavors of InnoDB flushing
January 13, 2011 By 9 Comments
… workload is mostly bound by the LRU list, then innodb_adaptive_flushing, innodb_max_dirty_pages_pct, innodb_io_capacity, and innodb…, innodb_buffer_pool_pages_flushed, but it shows the sum of flushing from both the LRU list and the flush list. In Percona… you are flush list bound, then for MySQL 5.1/InnoDB-plugin or MySQL 5.5 the setting of innodb_adaptive_flushing, innodb…
