[rabbitmq-discuss] erlang-client problem on OS X (empty_rpc_bottom_half)
sysop at mindspring.com
Sat Dec 13 03:39:46 GMT 2008
>> I ended up writing a rabbit_memsup_darwin.erl to take into account
>> cache and buffers,
> We contemplated doing exactly that two days ago. How did you go
> about it? AFAIK there is no /proc/meminfo on OS X :(
My attempt (attached) involved:
- scrape vm_stat output
- use total = free + active + inactive + wired
- use total free = free + inactive
- run broker with rabbit_memsup_darwin
- launch MulticastMain (on Linux) against the broker (on OS X).
- watching the OS X machine reach 8M free (reported) memory and
start swapping madly.
After testing and further investigation, it turns out FreeBSD and
Darwin use a unified buffer cache not kind enough to expose usage
>> but it looks like memsup reports correctly enough.
> Are you saying that Erlang's standard memsup takes into account
> cache and buffers already on OS X? That would be a pleasant surprise.
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.
>> Lesson learned. When developing with unpredictable memory usage*,
>> manually increase the memory threshold:
> In the upcoming 1.5.0 release there will also be a flag to disable
> memsup completely.
: http://www.wagerlabs.com/blog/2008/03/hacking-the-uni.html and http://black-chair.livejournal.com/11395.html
Matt Stancliff San Jose, CA
AIM: seijimr iPhone: 678-591-9337
"The best way to predict the future is to invent it." --Alan Kay
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