[rabbitmq-discuss] erlang-client problem on OS X (empty_rpc_bottom_half)

Mon Dec 15 16:34:41 GMT 2008

Matthias,

On Dec 15, 2008, at 5:48 AM, Matthias Radestock wrote:

> Matt Stancliff wrote:
>>  Nothing currently includes buffer/page cache statistics.  They are  
>> opaque, hidden, out of reach, verboten.  The value of free memory  
>> is the best we have.
>
> Is that really the case? While there may not be any info about UBC's  
> memory usage, surely any memory it does use is included in vm_stat's  
> inactive page count, isn't it?

   By "includes" I meant "directly exposes."  The inactive list  
includes any pages not accessed recently inclusive of of cache,  
buffers, or process pages:
"The inactive list contains pages that are currently resident in  
physical memory but have not been accessed recently. These pages  
contain valid data but may be released from memory at any time." from http://developer.apple.com/DOCUMENTATION/Performance/Conceptual/ManagingMemory/Articles/AboutMemory.html

   We don't have a view into the amount of cache capable of being  
quickly discarded versus entering into paging out pieces of processes.

-Matt
-- 
Matt Stancliff                    San Jose, CA
AIM: seijimr              iPhone: 678-591-9337
"The best way to predict the future is to invent it." --Alan Kay