1 /* Copyright (c) 2004-2022. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #ifndef SIMGRID_KERNEL_RESOURCE_NETWORKMODELFACTORS_HPP
7 #define SIMGRID_KERNEL_RESOURCE_NETWORKMODELFACTORS_HPP
9 #include "simgrid/sg_config.hpp"
10 #include "xbt/asserts.h"
11 #include <simgrid/forward.h>
13 #include <unordered_set>
16 namespace simgrid::kernel::resource {
18 /** This Trait of NetworkModel is in charge of handling the network factors (bw and lat) */
20 class XBT_PUBLIC NetworkModelFactors {
21 using NetworkFactorCb = double(double size, const s4u::Host* src, const s4u::Host* dst,
22 const std::vector<s4u::Link*>& links,
23 const std::unordered_set<s4u::NetZone*>& netzones);
25 std::function<NetworkFactorCb> lat_factor_cb_;
26 std::function<NetworkFactorCb> bw_factor_cb_;
30 * @brief Get the right multiplicative factor for the latency.
31 * @details Depending on the model, the effective latency when sending a message might be different from the
32 * theoretical latency of the link, in function of the message size. In order to account for this, this function gets
35 double get_latency_factor(double size, const s4u::Host* src, const s4u::Host* dst,
36 const std::vector<s4u::Link*>& links, const std::unordered_set<s4u::NetZone*>& netzones);
38 /** Get the right multiplicative factor for the bandwidth (only if no callback was defined) */
39 double get_latency_factor();
42 * @brief Get the right multiplicative factor for the bandwidth.
44 * @details Depending on the model, the effective bandwidth when sending a message might be different from the
45 * theoretical bandwidth of the link, in function of the message size. In order to account for this, this function
48 double get_bandwidth_factor(double size, const s4u::Host* src, const s4u::Host* dst,
49 const std::vector<s4u::Link*>& links, const std::unordered_set<s4u::NetZone*>& netzones);
51 /** Get the right multiplicative factor for the bandwidth (only if no callback was defined) */
52 double get_bandwidth_factor();
55 * @brief Callback to set the bandwidth and latency factors used in a communication
57 * This callback offers more flexibility when setting the network factors.
58 * It is an alternative to SimGrid's configs, such as network/latency-factors
59 * and network/bandwidth-factors.
61 * @param size Communication size in bytes
62 * @param src Source host
63 * @param dst Destination host
64 * @param links Vectors with the links used in this comm
65 * @param netzones Set with NetZones involved in the comm
66 * @return Multiply factor
68 /** @brief Configure the latency factor callback */
69 void set_lat_factor_cb(const std::function<NetworkFactorCb>& cb);
71 /** @brief Configure the bandwidth factor callback */
72 void set_bw_factor_cb(const std::function<NetworkFactorCb>& cb);
74 /** Returns whether a callback was set for latency-factor OR bandwidth-factor */
75 bool has_network_factor_cb() { return lat_factor_cb_ || bw_factor_cb_; }
78 } // namespace simgrid::kernel::resource
80 #endif /* SIMGRID_KERNEL_RESOURCE_NETWORKMODELFACTORS_HPP */