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eRPC is a fast and general-purpose RPC library for datacenter networks. Our NSDI 2019 paper describes the system in detail. Documentation is available online.

Some highlights:

• Multiple supported networks: Ethernet, InfiniBand, and RoCE
• Low latency: 2.3 microseconds round-trip RPC latency with UDP over Ethernet
• Performance for small 32-byte RPCs: ~10M RPCs/sec with one CPU core, 60--80M RPCs/sec with one NIC.
• Bandwidth for large RPC: 75 Gbps on one connection (one CPU core at server and client) for 8 MB RPCs
• Scalability: 20000 RPC sessions per server
• End-to-end congestion control that tolerates 100-way incasts
• Nested RPCs, and long-running background RPCs
• A port of Raft as an example. Our 3-way replication latency is 5.3 microseconds with traditional UDP over Ethernet.

• Toolchain: A C++11 compiler and CMake 2.8+
• See scripts/packages/ for required software packages for your distro.
• The latest rdma_core, preferably installed from source
• For non-Mellanox DPDK-compatible NICs, a system-wide installation from DPDK 19.11.5 LTS sources (i.e., sudo make install T=x86_64-native-linuxapp-gcc DESTDIR=/usr). Other DPDK versions are not supported.
• NICs: Fast (10 GbE+) NICs are needed for good performance. eRPC works best with Mellanox Ethernet and InfiniBand NICs. Any DPDK-capable NICs also work well.
• System configuration:
  • At least 1024 huge pages on every NUMA node, and unlimited SHM limits
  • On a machine with n eRPC processes, eRPC uses kernel UDP ports {31850, ..., 31850 + n - 1}. These ports should be open on the management network. See scripts/firewalld/erpc_firewall.sh for systems running firewalld.

• Build and run the test suite: cmake . -DPERF=OFF -DTRANSPORT=dpdk; make -j; sudo ctest.
  • DPERF=OFF enables debugging, which greatly reduces performance. Set DPERF=ON for performance measurements.
  • Here, dpdk should be replaced with infiniband for InfiniBand NICs.
  • A machine with two ports is needed to run the unit tests if DPDK is chosen. Run scripts/run-tests-dpdk.sh instead of ctest.
• Run the hello_world application:
  • cd hello_world
  • Edit the server and client hostnames in common.h
  • Based on the transport that eRPC was compiled for, compile hello_world using make dpdk, or make infiniband.
  • Run ./server at the server, and ./client at the client
• Generate the documentation: doxygen

• Ethernet/UDP mode:
  • DPDK-enabled NICs: Use DTRANSPORT=dpdk
    • We have primarily tested Mellanox CX3--CX5 NICs.
  • DPDK-enabled NICs on Microsoft Azure: Use -DTRANSPORT=dpdk -DAZURE=on
• RDMA (InfiniBand/RoCE) NICs: Use DTRANSPORT=infiniband. Add DROCE=on if using RoCE.

• eRPC works well on Azure VMs with accelerated networking.

• Configure two Ubuntu 18.04 VMs as below. Use the same resource group and availability zone for both VMs.

  • Uncheck "Accelerated Networking" when launching each VM from the Azure portal (e.g., F32s-v2). For now, this VM should have just the control network (i.e., eth0) and lo interfaces.
  • Add a NIC to Azure via the Azure CLI: az network nic create --resource-group <your resource group> --name <a name for the NIC> --vnet-name <name of the VMs' virtual network> --subnet default --accelerated-networking true --subscription <Azure subscription, if any> --location <the VM's availability zone>
  • Stop the VM launched earlier, and attach the NIC created in the previous step to the VM (i.e., in "Networking" -> "Attach network interface").
  • Re-start the VM. It should have a new interface called eth1, which eRPC will use for DPDK traffic.

• Prepare DPDK 19.11.5:

  • rdma-core must be installed from source. First, install its dependencies listed in rdma-core's README. Then, in the rdma-core directory:

    • cmake .
    • sudo make install

  • Install upstream pre-requisite libraries and modules:

    • sudo apt install make cmake g++ gcc libnuma-dev libgflags-dev numactl
    • sudo modprobe ib_uverbs
    • sudo modprobe mlx4_ib

  • Download the DPDK 19.11.5 tarball and extract it. Other DPDK versions are not supported.

  • Edit config/common_base by changing CONFIG_RTE_LIBRTE_MLX5_PMD and CONFIG_RTE_LIBRTE_MLX4_PMD to y instead of n.

  • Build and install DPDK: sudo make install T=x86_64-native-linuxapp-gcc DESTDIR=/usr

  • Create hugepages:

sudo bash -c "echo 2048 > /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages"
sudo mkdir /mnt/huge
sudo mount -t hugetlbfs nodev /mnt/huge

• Build eRPC's library and latency benchmark:

cmake . -DTRANSPORT=dpdk -DAZURE=on
make
make latency

• Create the file scripts/autorun_process_file like below. Here, do not use the IP addresses of the accelerated NIC (i.e., not of eth1).

<Public IPv4 address of VM #1> 31850 0
<Public IPv4 address of VM #2> 31850 0

• Run the eRPC application (the latency benchmark by default):
  • At VM #1: ./scripts/do.sh 0 0
  • At VM #2: ./scripts/do.sh 1 0

• The apps directory contains a suite of benchmarks and examples. The instructions below are for this suite of applications. eRPC can also be simply linked as a library instead (see hello_world/ for an example).
• To build an application, create scripts/autorun_app_file and change its contents to one of the available directory names in apps/. See scripts/example_autorun_app_file for an example. Then generate a Makefile using cmake . -DTRANSPORT=dpdk/infiniband.
• Each application directory in apps/ contains a config file that must specify all flags defined in apps/apps_common.h. For example, num_processes specifies the total number of eRPC processes in the cluster.
• The URIs of eRPC processes in the cluster are specified in scripts/autorun_process_file. Each line in this file must be <hostname> <management udp port> <numa_node>.
• Run scripts/do.sh for each process:
  • With single-CPU machines: num_processes machines are needed. Run scripts/do.sh <i> 0 on machine i in {0, ..., num_processes - 1}.
  • With dual-CPU machines: num_machines = ceil(num_processes / 2) machines are needed. Run scripts/do.sh <i> <i % 2> on machine i in {0, ..., num_machines - 1}.
• To automatically run an application at all processes in scripts/autorun_process_file, run scripts/run-all.sh. For some applications, statistics generated in a run can be collected and processed using scripts/proc-out.sh.

• GitHub issues are preferred over email. Please include the following information in the issue:
  • NIC model
  • rdma_core version and DPDK version
  • Operating system

Anuj Kalia

	Copyright 2018, Carnegie Mellon University

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