[zeromq-dev] assertion failure with master

Chuck Remes cremes.devlist at mac.com
Mon Nov 8 06:14:35 CET 2010

I was running a program that allocated a couple of hundred REQ sockets to connect to a server with a single REP socket via a QUEUE device.

I noticed that when I allocated >64 sockets I started getting an assertion failure.

  Assertion failed: nbytes == sizeof (command_t)  (mailbox.cpp:193)

I examined the code and saw a comment explaining how this should *never* happen since the command size was already confirmed as being less than the PIPE_BUF. However, I noted a reference to SNDBUF higher up in that same function. I'm wondering if I am exhausting a system resource (SNDBUF in this case) by allocating so many sockets.

BTW, this shell has a very high file descriptor limit (25k) so I know I haven't hit that particular limit.

I can show the code but it's ruby and I know that gives some folks hives. :)

Just imagine a loop that allocates several hundred or several thousand REQ sockets that are all connecting to the same QUEUE device endpoint.


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