Hi Sven,
On 18/11/10 17:00, Sven Schulz wrote:
Just a few generic questions: What is the difference between shared
and private memory in opensips?
Private memory is the memory used by one process, while shared memory is
memory accessible by all processes (it is an IPC method, see
http://en.wikipedia.org/wiki/Shared_memory). The private memory is used
for temporary storages required for certain processing by a process,
while the shared memory is used to store data that must be accessible by
all processes.
And how does each relate to the child processes?
When you set the private memory(by editing config.h) it means that each
process will have that amount of private memory. What you set with -m
parameter when starting opensips is the entire chunk of shared memory
that will be used. OpenSIPS has an internal memory management system -
and it allocates all the required memory at startup - so
no_of_children*pkg_mem private memory and shm_mem shared memory and from
these chuncks allocated at startup it gives to the processes pieces when
they ask for it with pkg_malloc or shm_malloc.
Also, is there a good guideline to what these should be set in
relation to how much RAM is installed.
You must have at least RAM as no_of_children*pkg_mem + shm_mem.
Regards,
--
Anca Vamanu
www.voice-system.ro
Thanks,
Sven Schulz
Penn State University
Telecommunications and Network Services
814.865.6116
sip:[email protected]
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