Liu, Raymond 2013-02-16, 03:40
-Re: why my test result on dfs short circuit read is slower?
Michael Segel 2013-02-18, 10:16
On Feb 17, 2013, at 7:09 PM, "Liu, Raymond" <[EMAIL PROTECTED]> wrote:
Drop this down to 64KB not 128KB.
You have 16 cpu which really means 8 cores and 4 disks.
Do you have Ganglia up and running?
I'll wager that you'll see a lot of wait cpu cycles in both cases.
Also how much memory do you have on each machine?
Tuning is going to be hardware specific and without really understanding what each parameter does, you can hurt performance.
Michael Segel | (m) 312.755.9623
Segel and Associates
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Liu, Raymond 2013-02-18, 06:04
谢良 2013-02-18, 06:59