… MySQL Consulting work or even more frequently. IO Bound workload is quite different from CPU bound one, which happens when your working set… back to speed. The cases when going from CPU bound to IO bound hits the most is there a lot of rows are… such design in CPU bound case – yes you will but it will happen with 100.000 messages not 100 messages as in IO bound…
Post: Falcon Storage Engine Design Review
January 12, 2007 By 19 Comments
… base of my MySQL use with existing applications – if you design new applications which are done specially for Falcon you might… 8-16M as you need with page cache. There are design techniques though to improve page cache efficiency in this respect… single piece ? These are going to be pretty important for IO bound workloads.
Post: Why MySQL could be slow with large tables ?
June 9, 2006 By 139 Comments
… reason ? The reason is normally table design and understanding inner works of MySQL. If you design your data wisely considering what MySQL… even if 50% of rows are accessed, while for disk IO bound accessess we might be better of doing full table scan…. Now if we take the same hard drive for fully IO bound workload it will be able to provide just 100 row…
Post: How multiple disks can benefit for single client workload ?
April 26, 2008 By 4 Comments
… of the people understand IO and as not as I typically use these terms. For me IO is IO bound workload – disks are moving…) – it is very easy to see if system is IO bound or CPU bound, while to understand if MySQL goes through more rows… is sequential read ahead and random read ahead which are designed to spot data access patterns and preform the data before…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
… values for any of these variables is indication of IO bound workload. Note however – IO requests submited by threads executing requests are not… may have these at zeroes while workload being IO bound still. Next, number of file IO operations is shown as well as computed… you may see a bit conflicting information. This is by design as requiring global lock to provide consitent information would cause…
Comment: Falcon Storage Engine Design Review
January 12, 2007 By 19 Comments
… flushing on transaction commit, size of log files etc. Regarding design – this is something which can’t really be changed in… main benefit is actually dramatically reducing number of IOs needed for range scan for IO bound queries. Yes I see there is tradeoff… my consulting practice comes from the cases which corresponds to IO bound workloads. With modern CPUs if you data is in memory…
Post: Side load may massively impact your MySQL Performance
November 13, 2011 By 7 Comments
… and see what can be done to remedy it. We designed the benchmark the following way – there is a small table… buffer pool with only 12MB remaining. This makes workload extremely IO bound hence such drop in performance. The performance of mysqldump is… happen the workload which is normally in memory becomes disk IO bound which can slow it down more than 100 times. The…
Post: Detailed review of Tokutek storage engine
April 28, 2009 By 21 Comments
… index. It’s as if Fractal Trees turn random IO into sequential IO. This is why you see the results that you…. As you see in IO-bound case TokuDB outperforms InnoDB 1.4-2.5x times, but CPU-bound is not so good. I…. – We did not tested wide range of queries, but by design expect there may be not good results for some kind…
Post: Scaling: Consider both Size and Load
July 13, 2010 By 5 Comments
… of advanced in scalability of MySQL by improving locking code design, others, such as row level locks would require application changes… memory, hence having CPU bound workload. As your data growths you may frequently find load becoming IO bound and hence things becoming 10x… more data which you need to carefully take into account. Design Limits This is the brother of contention but I decided…
Post: InnoDB thread concurrency
June 5, 2006 By 4 Comments
… Disk resource. For Disk IO bound workload you could only account number of disks and for CPU bound only number of CPUs. In…. It was designed as separate variable beause log flushing is frequently IO bound operation even if rest of workload is CPU bound so same…
