---
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layout: "docs"
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page_title: "Convergence Simulator"
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sidebar_current: "docs-internals-simulator"
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description: |-
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The graph below shows the expected time to reach various states of convergence
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depending on the settings which are tunable below the graph. Below the graph,
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the estimated maximum bandwidth usage is shown per node in kilobits per
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second.
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---
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<h1>Serf Convergence Simulator</h1>
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<p>
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The graph below shows the expected time to reach various states of convergence
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depending on the settings which are tunable below the graph. Below the graph,
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the estimated maximum bandwidth usage is shown per node in <em>kilobits</em>
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per second.
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</p>
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<p>
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The default values in the boxes are also the default values that Serf
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is configured with, where applicable.
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</p>
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<div class="row">
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<div id="graph"></div>
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</div>
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<div class="row">
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<div class="col-md-12">
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<h4>Estimated max bandwidth: <span id="bytes">0</span> kbps/node</h4>
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</div>
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</div>
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<div class="row">
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<div class="col-sm-6">
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<h5>Gossip Interval</h5>
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<p>The gossip interval controls how often messages are gossiped to other nodes</p>
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<input type="text" id="interval" value="0.2" class="simulator-input"> seconds
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</div>
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<div class="col-sm-6">
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<h5>Gossip Fanout</h5>
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<p>The gossip fanout controls how many nodes we gossip with</p>
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<input type="text" id="fanout" value="3" class="simulator-input"> nodes
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</div>
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</div>
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<div class="row">
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<div class="col-sm-6">
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<h5>Nodes</h5>
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<p>This controls how many simulated nodes are in the cluster</p>
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<input type="text" id="nodes" value="30" class="simulator-input">
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</div>
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<div class="col-sm-6">
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<h5>Packet Loss</h5>
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<p>This controls the amount of simulated packet loss [0, 100)</p>
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<input type="text" id="packetloss" value="0" class="simulator-input"> % lost packets
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</div>
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</div>
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<div class="row">
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<div class="col-sm-6">
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<h5>Node failures</h5>
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<p>This controls what percent of simulated nodes are failed</p>
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<input type="text" id="failed" value="0" class="simulator-input"> % failed
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</div>
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<div class="col-sm-6">
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</div>
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</div>
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