[zeromq-dev] Reduce zeromq memory usage?

[Pieter Hintjens]

David,

Do document your experiences on the wiki or elsewhere, it'll be really
useful for others who find themselves squeezing 0MQ applications into
small spaces.

-Pieter

On Sat, Oct 16, 2010 at 4:56 PM, David Wolfe <evadeflow at gmail.com> wrote:
>> > Can anyone offer advice on how to reduce zeromq's memory usage for
>> > an embedded app?  I think zmq_init() uses the default stack size
>> > (8192 KB in Linux), which is a pretty big chunk...
>
> [@Chuck Remes]
>> ...  the "ulimit" command can be used to modify the default stack size
>> from a shell prior to launching your application.
>
> That worked really well, thanks. Writing a little wrapper that says:
>
> #!/bin/sh
> ulimit -s 32
> ./usr/bin/testServer &
>
> decreased the %MEM reported by top from 19% to 5% (of 64MB total).
> This is comparable to the app I'm replacing.
>
>
>> > Also, for tcp, the buffers corresponding to SO_SNDBUF and SO_RCVBUF
>> > are probably defaulting to their maximums (128K each, I think).
>
> [@Chuck Remes]
>> Take a look at the man page for setsockopt(). There are accessors for
>> both send and receive buffers that you can use to tune the sizes.
>
> I set the snd/rcv buf sizes to 32K and this shaved off another 384KB.
> Not as dramatic a difference as changing the stack size, but it'll
> definitely help---particularly in the 'real' server when I'm servicing 4
> or 5 clients.
>
>
> [@Martin Sustrik]
>> Also, have a look at src/config.hpp. in_batch_size and out_batch_size
>> define size of the internal 0MQ's buffers that it uses for batching
>> inbound/outbound data.
>
> Thanks for pointing this out. It's nice to know where the 'knobs' are if
> I need to reduce memory usage further.  Things are looking pretty good
> now...
>
>
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>



-- 
-
Pieter Hintjens
iMatix - www.imatix.com