assert failure nbytes == sizeof (command_t) on OS X

[wttw]

./configure && make && make check fails on OS X with an assertion failure "nbytes == sizeof (command_t)" at mailbox.cpp:193 during test_shutdown_stress

OS X intel, 10.6.6. Apple gcc 4.2.1. ZeroMQ 2.1.0 release and SHA: be6a8cc1c1ecfe9489fb51e4869af15a13fc2cd2

[sustrik]

Yes. That's a known problem. It seems that OSX sets the sockepair buffer limit rather low and thus the sockepairs used for internal communication between threads inside 0MQ are not able to withstand the load. Moreover, it looks like there's a bug in OSX when resizing socketpair buffers (the size of the buffer reported by getsockopt is bogus). Anyway, I have no OSX box, so I cannot help much here. Feel free to have a look at the actual case of the problem yourself. The code you should look at is mailbox_t::send() function.

[rforte]

I know this has been addressed before but just want to put the note in for others that if you modify /etc/sysctl.conf and add:
net.local.stream.sendspace=3000000
net.local.stream.recvspace=3000000
and also run: ulimit -n 1200
the test will begin passing.
P.S.
I noticed on a clean install of 10.6.6 the file /etc/sysctl.conf does not exist. So creating the file 'sudo vi /etc/sysctl.conf' does solve the issue.