Hello,

I've found a piece of code that can be responsible for this:

#define MAX_SHM_ID 256

This is used to determine size of the registry.

What is rationale for hardcoding this like this?

m.

2016-06-09 12:02 GMT+02:00 marcin@saepia.net <marcin@saepia.net>:
Hello,

at some point I am getting the following errors from JACK

Jun  9 11:57:19 001-can1-plumber jackd[21110]: shm registry full
Jun  9 11:57:19 001-can1-plumber jackd[21110]: Cannot create shared memory segment of size = 422
Jun  9 11:57:19 001-can1-plumber jackd[21110]: JackShmMem::new bad alloc
Jun  9 11:57:19 001-can1-plumber jackd[21110]: Cannot open client
Jun  9 11:57:19 001-can1-plumber jackd[21110]: Cannot create new client

Max locked memory for this process is set to 134217728 while launching JACK via systemd.

It effectively causes JACK to hang.

I am using 1.9.10 (commit 1ed50c92) on ubuntu 16.04.

The configure flags are --clients=500 --ports-per-application=4 (I am not reaching 500 clients limit when that occurs, they are around 250).

JACK is started with dummy driver, and --port-max set to 2000.

What is the reason for hitting SHM limit? Can I overcome this in any way?

m.