Also important to know is that czmq uses an environment var ZSYS_MAX_SOCKETS (default 1024) which limits the maximum number of filedescriptors even when the process is allowed more.

from the man page:
//  Configure the number of sockets that ZeroMQ will allow. The default
//  is 1024. The actual limit depends on the system, and you can query it
//  by using zsys_socket_limit (). A value of zero means "maximum".
//  Note that this method is valid only before any socket is created.
CZMQ_EXPORT void
    zsys_set_max_sockets (size_t max_sockets);

Rg,

Arnaud


On 5/16/19 6:01 PM, Doron Somech wrote:
File descriptor is being used for signaling.
If zactor would use thread safe sockets it would be unlimited.

On Thu, May 16, 2019, 18:51 Arnaud Loonstra <arn...@sphaero.org <mailto:arn...@sphaero.org>> wrote:

    Hi all,

    I'm currently stress testing a setup with actors. What's the maximum
    number of running zactors? As it's using inproc no file descriptors are
    involved. I'm using this test:

          // mega zactor test
          zlist_t *spawned_act = zlist_new();
          for (int i=0;i<507;i++)
          {
              zactor_t *act = zactor_new(echo_actor, "Hello actor");
              assert(act);
              zlist_append(spawned_act, act);
          }
          while(zlist_size(spawned_act) > 0)
          {
              zactor_t *dstr = zlist_pop(spawned_act);
              zactor_destroy(&dstr);
          }

    If I go beyond 507 actors I receive an assert:

    src/zsock.c:88: zsock_new_checked: Assertion `self->handle' failed.

    Which traces back to:

    self->handle = zsys_socket (type, filename, line_nbr);

    Which is a wrapper for creating a zmq socket.

    Any ideas why there's is this limit of 507 actors?

    I also tried with my own actor library which adds pub/sub sockets to
    the
    actor. I then have a maximum of 252 actors.

    Rg,

    Arnaud

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