54e2e2a7ad
See issue #1608. This is an old issue with Windows 7. The effect is that we see a latency ramp on the first 500 messages. * The ramp is unaffected by message size. * Sleeping up to 100msec between sends has no effect except to switch off ZeroMQ batching so making the ramp more visible. * After 500 messages, latency falls back down to ~10-40 usec. * Over inproc:// the ramp happens when we use the signaler class. * Client-server over inproc:// does not show the ramp. * Client-server over tcp:// shows a similar ramp. We know that the signaller is using TCP on Windows. We can 'prime' the connection by doing 500 dummy sends. This potentially causes new sockets to be delayed on creation, which is not a good solution. Note that the signaller sends zero-byte messages. This may also be confusing TCP. Solution: flood the receive buffer when creating a new FD pair; send a 1M buffer and discard it. Fixes #1608
ZeroMQ
Welcome
The ZeroMQ lightweight messaging kernel is a library which extends the standard socket interfaces with features traditionally provided by specialised messaging middleware products. ZeroMQ sockets provide an abstraction of asynchronous message queues, multiple messaging patterns, message filtering (subscriptions), seamless access to multiple transport protocols and more.
Building and installation
See the INSTALL file included with the distribution.
Resources
Extensive documentation is provided with the distribution. Refer to doc/zmq.html, or "man zmq" after you have installed libzmq on your system.
Website: http://www.zeromq.org/
Development mailing list: zeromq-dev@lists.zeromq.org Announcements mailing list: zeromq-announce@lists.zeromq.org
Git repository: http://github.com/zeromq/libzmq
ZeroMQ developers can also be found on the IRC channel #zeromq, on the Freenode network (irc.freenode.net).
License
The project license is specified in COPYING and COPYING.LESSER.
libzmq is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License (LGPL) as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
As a special exception, the Contributors give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you must extend this exception to your version of the library.
libzmq is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.