>
>
>>> I understand Gmond has threads which listen to the multicast channel and
>>> write the data collected to a fast, in-memory hash table.
>>>
>>> What I am trying to understand is -
>>>
>>> a) Now is this memory hash table a bounded memory buffer ?
>>>
>>> b) If a gmond recieve a packet on multicast channel, it just goes ahead
>>> and update the memory-hash with some hash identifiers say node-location or
>>> collection group based ?
>>>
>>> What happens when we get another same collection metrics on multicast
>>> channel say after 20 sec time_threshold or 10 sec value_threshold which
>>> causes collection group to multicast ?
>>>
>>> Does that update all the values for the collection group in the memory
>>> hash obviously with the multiple threads updating multiple collection group
>>> metrics stored in memory hash ?
>>>
>>>
>> *Gmond is single threaded so I'm not sure your question applies.*
>>
>
> Well this is what I was not clear of that ganglia is single threaded
> because I see pthreads related reader/writer code in memory hash. But if it
> only executed in single threaded, the other part of the question which I
> described above is still valid -
>
>
>  a) Is this memory hash table a bounded memory buffer ?
>>>
>>
>  b) If a gmond recieve a packet on multicast channel, does it just goes
>>> ahead and update the memory-hash with some hash identifiers say
>>> node-location or collection group ?
>>>
>>
>  What happens when we get another same collection metrics on multicast
>>> channel say after 20 sec time_threshold or 10 sec value_threshold which
>>> causes collection group to multicast ? Does it keep single record for a
>>> hash identifier by which it means it removes the older value and update it
>>> with new one ?
>>>
>>
>
> * Aren't these questions still valid even if gmond is single threaded ? OR
> I am missing here something big time ?*
>

Can someone please respond to this ?

Thanks
Mahendra
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