[SR-Users] memory requirements for a registrar server

[Henning Westerholt]

On Tuesday 12 July 2011, Fabian Borot wrote:
> We are going to use kamailio 3.1.4 for a registrar server and need to know
> if the default parameters [shared memory and the like] is fine or if we
> need to plan in advance and increase it at compile time. If so, how should
> we proceed about it?

Hi Fabian,

the exact configuration depends on the load of your scenario, exact traffic 
patterns etc.. A PKG setting of 4-8 MB and a shared pool of 512MB should be 
really enough, if you don't have too extreme load.
 
> For subscribers and location type of information, which memory type should
> we be more concerned about? private memory, shared memory, memory per
> process etc because it looks like some modules use shared memory others
> private memory etc.

Normally you're more concerned about private (per process) memory, as this 
used to be a compile time definition and its generally smaller. In upcoming 
3.2 it will be possible to change it with a commandline parameter.

> Also , I see that the command "kamctl fifo get_statistics all" gives info
> about memory used etc. How should we interpret the output like this:

The output is about the shared memory pool memory manager.

> shmem:fragments = 24

memory fragments

> shmem:free_size = 9665456

free size

> shmem:max_used_size = 23915072

probably maximum used size since start

> shmem:real_used_size = 23888976

total size plus overhead from malloc

> shmem:total_size = 33554432

total size of memory pool, e.g. value from command line

> shmem:used_size = 23648072

allocated size

> is this fifo function exported by a specific module?

Its exported from the kamailio core.

Best regards,

Henning