Anyone run VW under XEN on RedHat Linux ???

1. I wrote a short method to monitor the micro-second clock by using a busy loop (about 6ms long) and grabbing the clock for 1000 loops.  The differences between the clock values varied from 250msg to -250ms -- when there was a large or -ve variation, at least some of the subsequent times were relative to that, so it was not just a glitch.
2. We noted we were running on a quad-core intel cpu -- so we forced the visual process to start up tied to a single processor -- problem went away.
3. We, do we have a H/W problem? a XEN problem? a Windows problem or a cincom problem???
4. I suspect its H/W or XEN or Windows.

Wouter Gazendam wrote:

No RedHat, but over here we're running production 32-bit and 64-bit
visualworkses in XEN's under Debian Edge.
 

Thanks for the quick reply.

I forgot to mention we are runinng Windows 2003 on top of XEN, and VW in windows 2003.

HTH,

WouteR

On Jan 24, 2008 5:12 PM, Dennis Smith [hidden email] wrote:
 

We are trying, but it acts very strangely.  It sometimes (but not
always) seems
to get hung up in a semaphore wait in Delay.  Delay's for 50ms or 200ms
become
effectively infinite.

Trying to debug and step does not move the cursor, but seems to (sometimes)
execute the code.

--
Dennis Smith                                     +1 416.798.7948
Cherniak Software Development Corporation   Fax: +1 416.798.0948
509-2001 Sheppard Avenue East        [hidden email]
Toronto, ON M2J 4Z8              <a class="moz-txt-link-freetext" href="sip:dennis@CherniakSoftware.com">sip:dennis@...
Canada                           http://www.CherniakSoftware.com
Entrance off Yorkland Blvd south of Sheppard Ave east of the DVP


   

-- 
Dennis Smith                 		         +1 416.798.7948
Cherniak Software Development Corporation   Fax: +1 416.798.0948
509-2001 Sheppard Avenue East        [hidden email]
Toronto, ON M2J 4Z8              <a class="moz-txt-link-freetext" href="sip:dennis@CherniakSoftware.com">sip:dennis@...
Canada			         http://www.CherniakSoftware.com
Entrance off Yorkland Blvd south of Sheppard Ave east of the DVP

So Dennis,

    fun bug!  How about trying to write a process that keeps the four clocks in sync?  Don't know if its possible, but if one can set the per-processor clock you'd probably only have to do it once an hour to eliminate drift between the processors. 

Also, below when you talk about the microsecond clock and milliseconds do you mean microseconds?

Best
Eliot

On Jan 25, 2008 1:19 PM, Dennis Smith <[hidden email]> wrote:

OK -- for the information of others and cincom, here is what
we have identified so far about this problem ....

1. I wrote a short method to monitor the micro-second clock by using a busy loop (about 6ms long) and grabbing the clock for 1000 loops.  The differences between the clock values varied from 250msg to -250ms -- when there was a large or -ve variation, at least some of the subsequent times were relative to that, so it was not just a glitch.
2. We noted we were running on a quad-core intel cpu -- so we forced the visual process to start up tied to a single processor -- problem went away.
3. We, do we have a H/W problem? a XEN problem? a Windows problem or a cincom problem???
4. I suspect its H/W or XEN or Windows.

Our workaround right now since we will be running 3 controlled images on this system is to simply force each to
a single procecssor -- this will get our client operating -- we will deal with the details later.

I will report again if/when I find out anything else.



Dennis Smith wrote:

Wouter Gazendam wrote:

No RedHat, but over here we're running production 32-bit and 64-bit
visualworkses in XEN's under Debian Edge.
 

Thanks for the quick reply.

I forgot to mention we are runinng Windows 2003 on top of XEN, and VW in windows 2003.

HTH,

WouteR

On Jan 24, 2008 5:12 PM, Dennis Smith [hidden email] wrote:
 

We are trying, but it acts very strangely.  It sometimes (but not
always) seems
to get hung up in a semaphore wait in Delay.  Delay's for 50ms or 200ms
become
effectively infinite.

Trying to debug and step does not move the cursor, but seems to (sometimes)
execute the code.

--
Dennis Smith                                     +1 416.798.7948
Cherniak Software Development Corporation   Fax: +1 416.798.0948
509-2001 Sheppard Avenue East        [hidden email]
Toronto, ON M2J 4Z8              sip:[hidden email]
Canada                           http://www.CherniakSoftware.com
Entrance off Yorkland Blvd south of Sheppard Ave east of the DVP


   

-- 
Dennis Smith                 		         +1 416.798.7948
Cherniak Software Development Corporation   Fax: +1 416.798.0948
509-2001 Sheppard Avenue East        [hidden email]
Toronto, ON M2J 4Z8              sip:[hidden email]
Canada			         http://www.CherniakSoftware.com
Entrance off Yorkland Blvd south of Sheppard Ave east of the DVP

-- 
Dennis Smith                 		         +1 416.798.7948
Cherniak Software Development Corporation   Fax: +1 416.798.0948
509-2001 Sheppard Avenue East        [hidden email]
Toronto, ON M2J 4Z8              [hidden email]
Canada			         http://www.CherniakSoftware.com
Entrance off Yorkland Blvd south of Sheppard Ave east of the DVP