[evlatests] Missing Modcomp-Free data

Bryan Butler bbutler at nrao.edu
Tue Jun 12 16:18:12 EDT 2007


i'd like to include somebody actually logging in to it during this operation as 
part of the test.  seems a fragile system if nobody can touch it while it's running.

	-bryan


On 6/12/07 14:12, Walter Brisken wrote:
> So far vispipe has never been found guilty -- more damage has been done 
> second guessing it.  Perhaps a maximal data rate project should be 
> observed to see if we can cause it to actually fail.  If this doesn't 
> happen then we should wait for some really compelling reason to look at it 
> again.
> 
> -W
> 
> On Tue, 12 Jun 2007, Bryan Butler wrote:
> 
>>
>> fine - but when i hear statements that vispipe runs at 99% CPU i get worried,
>> and think that the option of a bigger processor should be considered.
>>
>> 	-bryan
>>
>>
>> On 6/12/07 14:02, Ken Sowinski wrote:
>>> On Tue, 12 Jun 2007, Bryan Butler wrote:
>>>
>>>>
>>>> we do have the option of replacing the processor for vispipe, don't
>>>> we?  i
>>>> vaguely recall that we could upgrade it to the equivalent of one of
>>>> the CMIB
>>>> processors pretty trivially.  maybe it's time to look at that.
>>>
>>> I understand it to be exactly a cmib processor such as the
>>> ones we are using today.  There is no problem with vispipe.
>>> Rather we are learning about interactions between the executor,
>>> correlator, idcaf, vis-pipe and subarrays.  The way to fix the
>>> problem is to understand the interactions and render them
>>> harmless; not to look for bigger processors.
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