Creating a network proximity service
Overview
A network proximity service answers queries regarding the network proximity between hosts. The service accomplishes this by periodically performing round-trip network transfer experiments between hosts, keeping a record of observed network transfer times, and computing network distances.
Creating a network proximity service
In WRENCH, a network proximity service is defined by the
wrench::NetworkProximityService
class, an instantiation of which
requires the following parameters:
The name of a host on which to start the service;
A set of hosts names in a vector (
std::vector
), which define which hosts are monitored by the service; andMaps (
std::map
) of configurable properties (wrench::NetworkProximityServiceProperty
) and configurable message payloads (wrench::NetworkProximityServiceMessagePayload
).
The example below creates an instance that runs on host
Networkcentral
, and can answer network distance queries about hosts
Host1
, Host2
, Host3
, and Host4
. The service’s properties
are customized to specify that the service performs network transfer
experiments on average every 60 seconds, that the Vivaldi algorithm is
used to compute network coordinates, and that the message sent to the
service to lookup an entry is configured to be 1KiB:
auto np_service = simulation->add(
new wrench::NetworkProximityService("Networkcentral",
{"Host1", "Host2", "Host3", "Host4"},
{{wrench::NetworkProximityServiceProperty::NETWORK_PROXIMITY_MEASUREMENT_PERIOD, "60"},
{wrench::NetworkProximityServiceProperty::NETWORK_PROXIMITY_SERVICE_TYPE, "VIVALDI"}},
{{wrench::NetworkProximityServiceMessagePayload::NETWORK_DB_LOOKUP_REQUEST_MESSAGE_PAYLOAD, 1024}}));
See the documentation of wrench::NetworkProximityServiceProperty
and
wrench::NetworkProximityServiceMessagePayload
for all possible
configuration options.