1 /* 2 Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file 3 4 This file is part of libzmq, the ZeroMQ core engine in C++. 5 6 libzmq is free software; you can redistribute it and/or modify it under 7 the terms of the GNU Lesser General Public License (LGPL) as published 8 by the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 As a special exception, the Contributors give you permission to link 12 this library with independent modules to produce an executable, 13 regardless of the license terms of these independent modules, and to 14 copy and distribute the resulting executable under terms of your choice, 15 provided that you also meet, for each linked independent module, the 16 terms and conditions of the license of that module. An independent 17 module is a module which is not derived from or based on this library. 18 If you modify this library, you must extend this exception to your 19 version of the library. 20 21 libzmq is distributed in the hope that it will be useful, but WITHOUT 22 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 23 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 24 License for more details. 25 26 You should have received a copy of the GNU Lesser General Public License 27 along with this program. If not, see <http://www.gnu.org/licenses/>. 28 */ 29 30 #ifndef __ZMQ_CONFIG_HPP_INCLUDED__ 31 #define __ZMQ_CONFIG_HPP_INCLUDED__ 32 33 namespace zmq 34 { 35 // Compile-time settings. 36 37 enum 38 { 39 // Number of new messages in message pipe needed to trigger new memory 40 // allocation. Setting this parameter to 256 decreases the impact of 41 // memory allocation by approximately 99.6% 42 message_pipe_granularity = 256, 43 44 // Commands in pipe per allocation event. 45 command_pipe_granularity = 16, 46 47 // Determines how often does socket poll for new commands when it 48 // still has unprocessed messages to handle. Thus, if it is set to 100, 49 // socket will process 100 inbound messages before doing the poll. 50 // If there are no unprocessed messages available, poll is done 51 // immediately. Decreasing the value trades overall latency for more 52 // real-time behaviour (less latency peaks). 53 inbound_poll_rate = 100, 54 55 // Maximal delta between high and low watermark. 56 max_wm_delta = 1024, 57 58 // Maximum number of events the I/O thread can process in one go. 59 max_io_events = 256, 60 61 // Maximal batch size of packets forwarded by a ZMQ proxy. 62 // Increasing this value improves throughput at the expense of 63 // latency and fairness. 64 proxy_burst_size = 1000, 65 66 // Maximal delay to process command in API thread (in CPU ticks). 67 // 3,000,000 ticks equals to 1 - 2 milliseconds on current CPUs. 68 // Note that delay is only applied when there is continuous stream of 69 // messages to process. If not so, commands are processed immediately. 70 max_command_delay = 3000000, 71 72 // Low-precision clock precision in CPU ticks. 1ms. Value of 1000000 73 // should be OK for CPU frequencies above 1GHz. If should work 74 // reasonably well for CPU frequencies above 500MHz. For lower CPU 75 // frequencies you may consider lowering this value to get best 76 // possible latencies. 77 clock_precision = 1000000, 78 79 // On some OSes the signaler has to be emulated using a TCP 80 // connection. In such cases following port is used. 81 // If 0, it lets the OS choose a free port without requiring use of a 82 // global mutex. The original implementation of a Windows signaler 83 // socket used port 5905 instead of letting the OS choose a free port. 84 // https://github.com/zeromq/libzmq/issues/1542 85 signaler_port = 0 86 }; 87 } 88 89 #endif 90