[evlatests] Missing Modcomp-Free data

Mike Revnell mrevnell at nrao.edu
Tue Jun 12 16:11:54 EDT 2007


One CMIB is more computer than all the Modcomps put together. This makes 
me suspect that no matter how fast the processor it would suffer the 
same fate. As I understand it the vispipe does most of its I/O as busy-wait.

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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