Re: G5 so much slower then G4
Re: G5 so much slower then G4
- Subject: Re: G5 so much slower then G4
- From: Dave Camp <email@hidden>
- Date: Tue, 1 Jun 2004 14:24:32 -0700
You mentioned sending the data over the firewire ports... many people
have noticed that firewire writes on the G5 are actually slower than G4
desktops and G4 powerbooks. It has been documented on several
benchmarking web sites. As far as I know Apple has not commented on
this issue.
Dave
On Jun 1, 2004, at 1:15 PM, Marc Van Olmen wrote:
Hi,
All tests were done on a 10.3.4
I have a written a realtime dataprocessing program that reads a lot of
information from the disk and does something with the data. (in this
case
send it over the firewire port) Everything works fine on a G4 and
everything
is super fast. But on one of my clients with a G5 reported a problem
that my
programs is not working fine anymore (not realtime anymore) when he
starts
launching Finder copies (because more data is being copied on the
background
that needs to be processed).
So I did similar test on a G4 and their everything works fine. My
programs
gets sufficient amount of data from the G4 harddisk to make everything
being
processed on time.
So I bought a G5 this week and did some testing. I found out that my
thread
that is doing the read from disk, is giving very poor read
performance, when
the finder is doing some copying or launching other applications etc..
On a
G4 everything works fine! I can launch application and I can do Finder
copies in the background.
The solution I gonna explore now is doing async reads I noticed that c
libraries support non-blocking reads.
But the reason why I'm consulting your guys knowledge is why is this
happening?
Is it because my thread is getting less time available on a G5 because
this
system is so much faster. Is the Mach Scheduler messing up on a G5?
Is there something I can do about this for example give the Finder less
priority. I tried playing with priority of my threads but that doesn't
seem
to help.
My thanks are already being sent to anyone that can solve this puzzle,
Mvo
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