Re: Wierd slowdowns

Below is the reference to the sys_time() patch.  
While the sys_time patch can dramatically affect the speed of some
programs, I would think you'd see this slowdown appear on different
nodes as the processes ran over an extended period as with your
application.  With one node behaving this way, I would be very
suspicious of that node's hardware.  This could very well be a heat
related problem.  Bruce

>>David Black and Tony Travis  -  sys_time() patch 
http://sourceforge.net/mailarchive/message.php?msg_id=7184719 
allows execution of the function on the current node 
Programs that frequently execute the sys_time function, such as
SETI@home, show remarkable improvements by executing this clock function
on the current openMosix node. 

WARNING: It is critical to sync all the clocks in the cluster.

(Typical of many openMosix contributions, this innovations benefits
from stepwise improvements.  David Black's original patch was improved
by Vincent Hanquez (Tab), then by Tony Travis.) 


>>> "Ian Latter" <[email protected]> 2/5/2006 3:32 PM >>>

Hmm, I thought this was new a couple of days ago when I first
read it too .. but in my half awake state this morning, it sounds
a little like the time() bug .. the one that the patch was written
for (the local time patch).  Didn't it end up with long on-cpu 
delays after random run-times (of up to days)?  Don't remember
who wrote the patch ... I did some experimenting with NTP about
18-24months ago to work the patch into CHAOS tho .. not that
this worked.




----- Original Message -----
>From: "Kris Buytaert" <mlkb-1zPVpAQ/[email protected]>
>To: 
>Subject:  Re: [openMosix-general] Wierd slowdowns
>Date: Sun, 05 Feb 2006 14:59:30 +0100
>
> On Thu, 2006-02-02 at 15:56 +0100, Jeroen Demeyer wrote:
> > Hello list,
> > 
> > I'm having a very strange problem where some processes just 
execute much 
> > slower than they should.  Let me explain: sometimes, for no
apparent 
> > reason, a certain process takes much more CPU time than normal.  
For 
> > instance, a certain program normally finishes after about 1
CPU-hour, 
> > but sometimes it might take 30 hours or more.  With "CPU-hour", I 
really 
> > mean time spent on CPU (not real time), as reported by ps for 
example.
> > 
> 
> 
> > Also note that I don't see any particular correlation between this
bug 
> > and openMosix, so it could be that openMosix doesn't have anything
to 
do 
> > with it.  However, so far I have only seen this problem on the
diskless 
> > 'slave' nodes, and not on the master node (with uptime of 58 days),

> > which runs the same kernel.
> > 
> > If anyone has ever seen anything similar to this, please say so.
> I've never seen anything similar to this.
> 
> You mention "this node 32" , do you mean that it only happens on 1
> particular node or is it happening on more nodes ?
> 
> Also,  have you got an idea about the status of the network at that
> moment ?   It it more loaded than otherwise ? 
> 
> 
> greetings
> 
> -- 
> Kris Buytaert <mlkb-1zPVpAQ/[email protected]>
> 
> 
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--

Ian Latter
Late night coder ..
http://midnightcode.org/ 



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