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research/rln-delay-simulations/README.md
Alvaro Revuelta e411aefe17
Add latency simulation methodology in cloud (#85)
2024-02-14 15:22:02 +01:00

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rln-delay-simulations

This folder contains two methods of simulations, that aim to estimate the latency of waku messages in the network:

  • Method 1: Using shadow, which allows simulating hundreds of nodes in a single machine, considering network conditions but not CPU. See report
  • Method 2: Using Digital Ocean, deploying real nodes in different locations in real machines with real network conditions, but due to cost limited to few nodes.

Method 1: Shadow

This folder contains a shadow configuration to simulate 1000 nwaku nodes in an end to end setup:

  • nwaku binaries are used, built with make wakunode2 but with a minor modification, see simulations
  • rln is used with hardcoded static memberships, to avoid the sepolia node + contract, see.
  • Focused on measuring message propagation delays. Each message that is sent, encodes the timestamp when it was created.
  • Requires significant resources to run (tested with 256 GB RAM)
  • See simulation parameters: latency, bandwidth, amount of nodes, amount of publishers.
  • Note that due to TCP flow control, when using big messages the first ones to arrive will show a higher delay. Filter them out to not bias the measurements.

How to run

Get nwaku codebase and checkout to simulations branch, build it and start the shadow simulation. Ensure path points to the wakunode2 binary and you have enough resources.

git clone https://github.com/waku-org/nwaku.git
cd nwaku
git checkout simulations
make wakunode2
shadow shadow.yaml

How to analyze

First check that the simulation finished ok. Check that the numbers match.

grep -nr 'ended_simulation' shadow.data | wc -l
# expected: 1000 (simulation finished ok in all nodes)

grep -nr 'tx_msg' shadow.data | wc -l
# expected: 10 (total of published messages)

grep -nr 'rx_msg' shadow.data | wc -l
# expected: 9990 (total rx messages)

Get metrics:

grep -nr 'rx_msg' shadow.data > latency.txt
grep -nr 'mesh_size' shadow.data > mesh_size.txt

Print results:

python analyze.py latency.txt "arrival_diff="
python analyze.py mesh_size.txt "mesh_size="

Method 2: Digital Ocean

In this method we deploy real nwaku nodes at different locations with some traces that allow us to measure the propagation times of a given message across all nodes. For this experiment, 5 locations were selected:

  • Frankfurt
  • New York
  • San Francisco
  • Bangalore
  • Singapore

Since deploying thousands of nodes would be costly, we connected the nodes in cascade: Singapore<->Bangalore<->San Francisco<->New York<->Frankfurt

This forces a message to travel multiple hops. For example, a message introduced by the Singapore instance has to travel via Bangalore and San Francisco before reaching New York. This effectively simulates the existing hops in a real network. The following commands allow to reproduce the setup. Its assumed that you have 5 different machines at 5 different locations and you can ssh into them:

In every machine, compile wakunode2

apt-get install build-essential git libpq5
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
source "$HOME/.cargo/env"
git clone https://github.com/waku-org/nwaku.git
cd nwaku
git checkout benchmark-latencies
make wakunode2

Start Singapore node. Note rest api is enabled. Set also the message size that you want. Set --max-msg-size=600KB if you want a bigger message size.

export MSG_SIZE_KB=100
./build/wakunode2 --rest --rest-address=0.0.0.0 --relay=true --topic=/waku/2/test --rln-relay=true --rln-relay-dynamic=false --rln-relay-membership-index=0 --nodekey=070a6101339f8e03a56bf21127dbbb0110b9b6efdb1e217115ed6d80da7a46d0

Connect Bangalore<->Singapore

./build/wakunode2 --relay=true --topic=/waku/2/test --rln-relay=true --rln-relay-dynamic=false --rln-relay-membership-index=1 --nodekey=e9c166557cf6cf1d0fc6a4b1bb98e417a6de6c361b228dea72d54ffe4442a115 --staticnode=/ip4/SINGAPORE_IP/tcp/60000/p2p/16Uiu2HAmU3GnnKHPLJFWDLGMEt1mNDAFmaKWUdkR9gWutaLbk2xx

Connect San Francisco<->Bangalore

./build/wakunode2 --relay=true --topic=/waku/2/test --rln-relay=true --rln-relay-dynamic=false --rln-relay-membership-index=2 --nodekey=f9a4f0f889b6dbf55d6b32bb8a85c418df01f013cebcd23efd8a250df65d9337 --staticnode=/ip4/BANGALORE_IP/tcp/60000/p2p/16Uiu2HAmSDAp4VrbKQPStDLg7rc38JJR3zE5mJcFieAGJLBrCFCy

Connect New York<->San Francisco

./build/wakunode2 --relay=true --topic=/waku/2/test --rln-relay=true --rln-relay-dynamic=false --rln-relay-membership-index=3 --nodekey=100a04176710aabdec3258e1b6cdfbbdf602af36ea2311415ae7504bddd86cac --staticnode=/ip4/SANFRANCISCO_IP/tcp/60000/p2p/16Uiu2HAm8zWqrWRp6typPSdL7nqBRGbabH87vmkzN6A3McaGDj3C

Connect Frankfurt<->NewYork

./build/wakunode2 --relay=true --topic=/waku/2/test --rln-relay=true --rln-relay-dynamic=false --rln-relay-membership-index=4 --nodekey=eb131c2ee17807042f5051b6d7b9fbbbdc83369f28315157d8401fa13bf2b88f --staticnode=/ip4/NEW_YORK_IP/tcp/60000/p2p/16Uiu2HAmJdukvEFU1LhCQHGNcFviWMJh95PU4vMoun2uUvWtaWQL

Now you can inject a message via the rest API of the node in Singapore. This message will travel all the way to Frankfurt in 4 hops.

curl -X POST "http://SINGAPORE_IP:8645/relay/v1/messages/%2Fwaku%2F2%2Ftest" \
 -H "content-type: application/json" \
 -d '{"payload":"dontcare","contentTopic":"string"}'

If you check the logs of every machine, you will find the timestamp of when each node received the message.