189 reputation
110
bio website tokutek.com
location Wakefield, MA
age 45
visits member for 5 years, 5 months
seen Oct 21 at 11:59
  • Currently VP/Engineering at Tokutek
  • 2009-2011 : Field Engineer and Community Advocate at VoltDB
  • 1992-2009 : Oracle database developer/designer/administrator for the first 16 years of my career
  • Passionate about all things technology: programming, design, databases, operating systems, hardware, optimization, benchmarking
  • Well versed in technical management and leadership, business process, and organization
  • Loves start-ups

Jul
9
awarded  Teacher
Jul
2
awarded  Curious
Jun
19
awarded  Notable Question
Jan
12
awarded  Autobiographer
Sep
13
awarded  Popular Question
Dec
10
awarded  Popular Question
Dec
3
comment How can I calculate the total size of an extremely large number of files with a particular extension?
Perfect. Dividing by 1024*1024 does exactly what I wanted.
Dec
3
accepted How can I calculate the total size of an extremely large number of files with a particular extension?
Dec
3
asked How can I calculate the total size of an extremely large number of files with a particular extension?
May
21
awarded  Commentator
May
21
comment CentOS 6 doing lots more IO than CentOS 5
We've found that transparent huge pages were the issue. By turning it off the performance of our Centos6 server is similar to Centos5. The command was "$ echo never > /sys/kernel/mm/redhad_transparent_hugepage/enabled". Other distributions do this via /sys/kernel/mm/transparent_hugepage/enabled"
May
21
comment CentOS 6 doing lots more IO than CentOS 5
None of the file system changes made much of a difference, some boosted things slightly and others made it slightly worse.
May
18
comment CentOS 6 doing lots more IO than CentOS 5
Thanks for the continued assistance, I'll reformat my XFS and see if that helps.
May
16
comment CentOS 6 doing lots more IO than CentOS 5
Tried all 4 of the above, none made any measurable difference in the performance of my benchmarks.
May
10
awarded  Editor
May
10
revised CentOS 6 doing lots more IO than CentOS 5
added 1253 characters in body
May
10
comment CentOS 6 doing lots more IO than CentOS 5
mount is identical on both machines, "/dev/cciss/c0d0p5 /data xfs defaults 0 0"
May
10
comment CentOS 6 doing lots more IO than CentOS 5
I'm benchmarking a MySQL application and not using direct IO.
May
10
comment CentOS 6 doing lots more IO than CentOS 5
Quest is that all things being equal, at least those that I can see, Centos 6.2 is benchmarking 50% of Centos 5.8 for my application. The other difference I can currently measure is that reads are MUCH higher.
May
10
asked CentOS 6 doing lots more IO than CentOS 5