[Simh] VAX: CPU Usage and Network Timeout

[Bishop, Lewis]

Sure - but bear in mind that this was for Windows servers. I think I posted
this a while back but I tried a piece of software called Relevos and whilst
it worked well it was a commercial product and had a near US$400 price tag.
After looking around I found threadmaster (http://threadmaster.tripod.com/)
which does pretty much the same - the only thing I didn't like about it was
that it limits everything except if where you exclude it - whereas relevos
limits what you define... Still I can live with that. ;-)

Lewis Bishop
---
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NZ Applications Delivery Unit Infrastructure Specialist - Oracle Database
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Email: lewis.bishop at eds.com


-----Original Message-----
From: Aaron Walsh [mailto:walsham at jmusa.com] 
Sent: Thursday, 9 June 2005 10:54 p.m.
To: Bishop, Lewis
Subject: RE: [Simh] VAX: CPU Usage and Network Timeout

Would you be willing to share what you did to create the "CPU limiter on
the emulator"?  That sounds exactly like what I need.

Aaron

>>> "Bishop, Lewis" <lewis.bishop at eds.com> 6/8/2005 10:24:12 PM >>>
Yes, I saw a similar effect with a windows server that was running
exchange
server - was getting all kinds of connection problems over the network
whilst the emulator was running and maxing out cpu - although the cpu
was
dropped when required by other processes it seemed to have an adverse
affect. I solved this by using a cpu limiter on the emulator. So yes,
I
could almost definitively say that in my case the high cpu usage was
causing
network related issues.

Lewis Bishop



-----Original Message-----
From: simh-bounces at trailing-edge.com
[mailto:simh-bounces at trailing-edge.com] 
On Behalf Of Aaron Walsh
Sent: Thursday, 9 June 2005 1:59 p.m.
To: newsham at lava.net 
Cc: simh at trailing-edge.com 
Subject: Re: [Simh] VAX: CPU Usage and Network Timeout

I did pay for the whole CPU, but I also want the CPU to last without
overheating ;)  My understanding is that nice and renice only control
the priority of the process.  But if nothing else is running on the
box
I get the feeling that nice wont stop SIMH from using the whole
processor.  Overall, I am not too concerned with the CPU usage, I am
more concerned with the network drop outs I am seeing.  I did some
more
research by pinging both the linux ip address and the emulated vax ip
address from a remote machine.  While the linux IP address always
responds back within 1-5 milliseconds the emulated ip takes longer. 
Which I am still okay with.  The main problem is that every minute
(and
I mean on the minute, for example at 8:30.02, 8:31.02, 8:32.02, etc)
for
one to three seconds the emulated IP doesnt reply to any ping or any
other network communication.  I have tried all kinds of variations of
tcpdump to see if I can track down what the issue might be, but I have
had no luck.

Has anyone else see this, or have any ideas how I can track it down.

Thanks
Aaron

>>> Tim Newsham <newsham at lava.net> 6/8/2005 4:12:14 PM >>>
> 2)CPU usage is about 100% on the Linux box.  I have searched google
and
> found that is to be expected.  I tried using the code below in the
> sim_console.c file but regardless of the value of timeout.tv_usec is
> used the emulated VAX was VERY slow.
[...]
> Anyone else have any ways to have simh use less CPU?

Why would you want your machine to use less than 100% of its cpu?
I mean, you paid for the whole cpu, might as well use it.  If
you're concerned about other processes getting more share of
the cpu, see the nice(1) and renice(p) man pages.

> Aaron

Tim Newsham
http://www.lava.net/~newsham/ 


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