Re: Xcode use 4 cores?
Re: Xcode use 4 cores?
- Subject: Re: Xcode use 4 cores?
- From: Jim McKinnon <email@hidden>
- Date: Thu, 17 Aug 2006 10:24:01 -0700
When you look at the results, when Anand disabled 2 cores, he
obtained the exact same results (dual 2.66) as 4 cores.
-Jim
On Aug 17, 2006, at 10:16 AM, Shawn Erickson wrote:
On 8/17/06, Jim McKinnon <email@hidden> wrote:
I read a review on Anandtech (http://www.anandtech.com/mac/
showdoc.aspx?i=2816) and going from dual to 4 cores did not speed up
compile times. This was surprising as xcode being multi-threaded.
Is this a bug or a real limitation?
Xcode will use all available cores in a system to compile individual
files. My PowerMac G5 Quad compiles nearly twice as fast as my
PowerMac Dual G5 (same hard drives in each) and if you look at the
build results window (and top) you see it is compiling 4 files at once
on the Quad G5 (2 at once on the Dual G5).
Also I am not sure what you are reading in the review but I see
this...
"The Mac Pro [2.66GHz] completely demolishes the PowerMac [Dual] G5
[2.5GHz] in build time, cutting the time to build Adium almost in
half. The performance improvement is tremendous and it echoes some of
the feelings we've had when using Intel based Macs; anything involving
I/O seems to be faster and smoother."
In other words it is in nearly twice as fast for a task that is disk
intensive (if they used a disk configuration that avoided IO limiting
your would see the Mac Pro more then double the compile speeds of the
Dual G5).
-Shawn
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