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---
layout: page
title: fi_udp(7)
tagline: Libfabric Programmer's Manual
---
{% include JB/setup %}
# NAME
fi_udp \- The UDP Fabric Provider
# OVERVIEW
The UDP provider is a basic provider that can be used on any
system that supports UDP sockets. The provider is not intended to provide
performance improvements over regular TCP sockets, but rather to allow
application and provider developers to write, test, and debug their code.
The UDP provider forms the foundation of a utility provider that enables
the implementation of libfabric features over any hardware.
# SUPPORTED FEATURES
The UDP provider supports a minimal set of features useful for sending and
receiving datagram messages over an unreliable endpoint.
*Endpoint types*
: The provider supports only endpoint type *FI_EP_DGRAM*.
*Endpoint capabilities*
: The following data transfer interface is supported: *fi_msg*. The
provider supports standard unicast datagram transfers, as well as
multicast operations.
*Modes*
: The provider does not require the use of any mode bits.
*Progress*
: The UDP provider supports both *FI_PROGRESS_AUTO* and *FI_PROGRESS_MANUAL*,
with a default set to auto. However, receive side data buffers are not
modified outside of completion processing routines.
# LIMITATIONS
The UDP provider has hard-coded maximums for supported queue sizes and data
transfers. These values are reflected in the related fabric attribute
structures
EPs must be bound to both RX and TX CQs.
No support for selective completions or multi-recv.
No support for counters.
# RUNTIME PARAMETERS
No runtime parameters are currently defined.
# SEE ALSO
[`fabric`(7)](fabric.7.html),
[`fi_provider`(7)](fi_provider.7.html),
[`fi_getinfo`(3)](fi_getinfo.3.html)
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