Check for thrashing

[Timothy O'Hare]

You could monitor the CPU load and swap space usage?

Guy B. Purcell wrote:
> 
> On Oct 4, 2005, at 19:26, Davy Durham wrote:
> 
>>  Does anyone know of a plugin that can check if a machine is  
>> "thrashing" by which I mean it continues to swap and swap.. because  
>> either there is too little ram, or too many processes running on  the 
>> box.
> 
> 
> I think such a thing would be unnecessary, really:  if a box is  
> thrashing (in the canonical sense of that word--something happens  that 
> causes it to have to work harder, which slows everything down so  jobs 
> pile up, causing it to have to work even harder, and so on in a  
> catch-22 cycle), then the various services on it you're otherwise  
> monitoring will time out because there aren't enough resources of one  
> kind or another to handle the monitor requests.
> 
>>   I would think a vmstat command could tell you that, though it  would 
>> need a few seconds to determine.  And I'm not sure what  numbers would 
>> indicate what a bad amount would be.
> 
> 
> The actual implementation of such a thing would need to be carefully  
> crafted to work across multiple OSes.  IMHO, it's not worth the  
> effort:  if a box truly is thrashing, you should know all about it  from 
> existing monitors.
> 
> -Guy
> 
> 
> 
> 
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