… run for CPU Bound,or it would be more correctly to say in-cache benchmark, because there is a lot of CPU remains…. This happens because of checkpointing activity which can basically stall processing while dirty buffers are flushed. This is serious issue in… utilize CPU more fully XtraDB will show more gains, though not 1.5x as for IO bound workload. One may ask why CPU is…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
…can be used to ballance between wasting CPU time running spin locks and doing unneeded… Old stale uncommitted transactions may block purge process eating up resources. By looking at …of these variables is indication of IO bound workload. Note however – IO requests submited by threads executing…
Post: Modeling MySQL Capacity by Measuring Resource Consumptions
March 8, 2011 By 1 Comment
… The #14 and #15 here is kernel and user CPU usage of MySQL process in 1/100 of the second. (This is… examines 20 rows, which means about 1 IO per 40 rows… which amounts to pretty IO bound load for me. But average is… less than 1 row in average which makes it very IO bound. So what If I am planning for load growth and…
Comment: Falcon Storage Engine Design Review
January 12, 2007 By 19 Comments
…however bunch of things which can be hardware related (CPU and disk concurrency), some are environment related – log …benefit is actually dramatically reducing number of IOs needed for range scan for IO bound queries. Yes I see there is… so there is no insight so far on internal processes which are …
Post: Using LoadAvg for Performance Optimization
December 4, 2006 By 4 Comments
… CPU bound load or IO bound load. For example if you have LoadAvg of 10 it may mean there are 10 processes/threads actively consuming CPU… it is CPU bound – because the system can execute much more CPU bound tasks in parallel or High if it is Disk Bound LoadAvg. Low… where waiting in the queue starts. If you have fully CPU bound workload which is rather parallel (ie many queries will run…
Post: Predicting Performance improvements from memory increase
August 7, 2008 By 6 Comments
… optimizing average performance. It may be heavy data processing batch job which is IO bound and which runs too slow (and affects other… it is IO bound (high IO system utilization, low CPU usage) one should think about how much CPU capacity is available. If your CPU is 25… have very IO bound application without serialization issues (say reporting slave) which is very IO bound showing 100% IO subsystem utilization on 5% of CPU usage…
Post: SystemTap - DTrace for Linux ?
September 14, 2009 By 17 Comments
… profile not CPU-bound load (for CPU-bound there is OProfile, see for example http://mysqlinsights.blogspot.com/2009/08/oprofile-for-io-bound-apps.html). I.e. for IO-bound or… system calls. Here is simple script to show IO activity per disk per process (well, it is similar to iotop, but iotop…
Post: Star Schema Bechmark: InfoBright, InfiniDB and LucidDB
January 7, 2010 By 46 Comments
… was fully 1 CPU bound during all queries. I think the problem that engine can use only single cpu/core is getting significant… need to enable MySQL optimizer. InfiniDB is otherwise was IO-bound, and processed data fully utilizing sequential reads and reading data with speed…’s blog http://infinidb.org/infinidb-blog/mysql-parallel-query-processing-of-ssb-queries-via-infinidb-.html SSB benchmark may be…
Post: Heikki Tuuri Innodb answers - Part I
October 26, 2007 By 17 Comments
… next extent when we are in the middle of the processing of the previous extent. Random read-ahead means that when… not stop IO pressure and OS may swap out not buffer pool but some other important parts of MySQL process. Q20: Weâ… in the official InnoDB, though. PZ: If your load is CPU bound and you’re scaling out you can get better performance…
Post: Scaling: Consider both Size and Load
July 13, 2010 By 5 Comments
… level locks would require application changes to allow more concurrent process. The scalability numbers depend a lot on the system scale… in memory, hence having CPU bound workload. As your data growths you may frequently find load becoming IO bound and hence things becoming 10x…
