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diff --git a/v1.91/usage/administration/understanding_synapse_through_grafana_graphs.html b/v1.91/usage/administration/understanding_synapse_through_grafana_graphs.html new file mode 100644 index 0000000000..f1b92356c0 --- /dev/null +++ b/v1.91/usage/administration/understanding_synapse_through_grafana_graphs.html @@ -0,0 +1,239 @@ +<!DOCTYPE HTML> +<html lang="en" class="sidebar-visible no-js light"> + <head> + <!-- Book generated using mdBook --> + <meta charset="UTF-8"> + <title>Understanding Synapse Through Grafana Graphs - Synapse</title> + <!-- Custom HTML head --> + <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> + <meta name="description" content=""> + <meta name="viewport" content="width=device-width, initial-scale=1"> + <meta name="theme-color" content="#ffffff" /> + + <link rel="icon" href="../../favicon.svg"> + <link rel="shortcut icon" href="../../favicon.png"> + <link rel="stylesheet" href="../../css/variables.css"> + <link rel="stylesheet" href="../../css/general.css"> + <link rel="stylesheet" href="../../css/chrome.css"> + <link rel="stylesheet" href="../../css/print.css" media="print"> + <!-- Fonts --> + <link rel="stylesheet" href="../../FontAwesome/css/font-awesome.css"> + <link rel="stylesheet" href="../../fonts/fonts.css"> + <!-- Highlight.js Stylesheets --> + <link rel="stylesheet" href="../../highlight.css"> + <link rel="stylesheet" href="../../tomorrow-night.css"> + <link rel="stylesheet" href="../../ayu-highlight.css"> + + <!-- Custom theme stylesheets --> + <link rel="stylesheet" href="../../docs/website_files/table-of-contents.css"> + <link rel="stylesheet" href="../../docs/website_files/remove-nav-buttons.css"> + <link rel="stylesheet" href="../../docs/website_files/indent-section-headers.css"> + </head> + <body> + <!-- Provide site root to javascript --> + <script type="text/javascript"> + var path_to_root = "../../"; + var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? 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(Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar"> + <i class="fa fa-search"></i> + </button> + </div> + + <h1 class="menu-title">Synapse</h1> + + <div class="right-buttons"> + <a href="../../print.html" title="Print this book" aria-label="Print this book"> + <i id="print-button" class="fa fa-print"></i> + </a> + <a href="https://github.com/matrix-org/synapse" title="Git repository" aria-label="Git repository"> + <i id="git-repository-button" class="fa fa-github"></i> + </a> + <a href="https://github.com/matrix-org/synapse/edit/develop/docs/usage/administration/understanding_synapse_through_grafana_graphs.md" title="Suggest an edit" aria-label="Suggest an edit"> + <i id="git-edit-button" class="fa fa-edit"></i> + </a> + </div> + </div> + + <div id="search-wrapper" class="hidden"> + <form id="searchbar-outer" class="searchbar-outer"> + <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header"> + </form> + <div id="searchresults-outer" class="searchresults-outer hidden"> + <div id="searchresults-header" class="searchresults-header"></div> + <ul id="searchresults"> + </ul> + </div> + </div> + <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM --> + <script type="text/javascript"> + document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible'); + document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible'); + Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) { + link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1); + }); + </script> + + <div id="content" class="content"> + <main> + <!-- Page table of contents --> + <div class="sidetoc"> + <nav class="pagetoc"></nav> + </div> + + <h2 id="understanding-synapse-through-grafana-graphs"><a class="header" href="#understanding-synapse-through-grafana-graphs">Understanding Synapse through Grafana graphs</a></h2> +<p>It is possible to monitor much of the internal state of Synapse using <a href="https://prometheus.io">Prometheus</a> +metrics and <a href="https://grafana.com/">Grafana</a>. +A guide for configuring Synapse to provide metrics is available <a href="../../metrics-howto.html">here</a> +and information on setting up Grafana is <a href="https://github.com/matrix-org/synapse/tree/master/contrib/grafana">here</a>. +In this setup, Prometheus will periodically scrape the information Synapse provides and +store a record of it over time. Grafana is then used as an interface to query and +present this information through a series of pretty graphs.</p> +<p>Once you have grafana set up, and assuming you're using <a href="https://github.com/matrix-org/synapse/blob/master/contrib/grafana/synapse.json">our grafana dashboard template</a>, look for the following graphs when debugging a slow/overloaded Synapse:</p> +<h2 id="message-event-send-time"><a class="header" href="#message-event-send-time">Message Event Send Time</a></h2> +<p><img src="https://user-images.githubusercontent.com/1342360/82239409-a1c8e900-9930-11ea-8081-e4614e0c63f4.png" alt="image" /></p> +<p>This, along with the CPU and Memory graphs, is a good way to check the general health of your Synapse instance. It represents how long it takes for a user on your homeserver to send a message.</p> +<h2 id="transaction-count-and-transaction-duration"><a class="header" href="#transaction-count-and-transaction-duration">Transaction Count and Transaction Duration</a></h2> +<p><img src="https://user-images.githubusercontent.com/1342360/82239985-8d392080-9931-11ea-80d0-843ab2f22e1e.png" alt="image" /></p> +<p><img src="https://user-images.githubusercontent.com/1342360/82240050-ab068580-9931-11ea-98f1-f94671cbac9a.png" alt="image" /></p> +<p>These graphs show the database transactions that are occurring the most frequently, as well as those are that are taking the most amount of time to execute.</p> +<p><img src="https://user-images.githubusercontent.com/1342360/82240192-e86b1300-9931-11ea-9aac-3e2c9bfa6fdc.png" alt="image" /></p> +<p>In the first graph, we can see obvious spikes corresponding to lots of <code>get_user_by_id</code> transactions. This would be useful information to figure out which part of the Synapse codebase is potentially creating a heavy load on the system. However, be sure to cross-reference this with Transaction Duration, which states that <code>get_users_by_id</code> is actually a very quick database transaction and isn't causing as much load as others, like <code>persist_events</code>:</p> +<p><img src="https://user-images.githubusercontent.com/1342360/82240467-62030100-9932-11ea-8db9-917f2d977fe1.png" alt="image" /></p> +<p>Still, it's probably worth investigating why we're getting users from the database that often, and whether it's possible to reduce the amount of queries we make by adjusting our cache factor(s).</p> +<p>The <code>persist_events</code> transaction is responsible for saving new room events to the Synapse database, so can often show a high transaction duration.</p> +<h2 id="federation"><a class="header" href="#federation">Federation</a></h2> +<p>The charts in the "Federation" section show information about incoming and outgoing federation requests. Federation data can be divided into two basic types:</p> +<ul> +<li>PDU (Persistent Data Unit) - room events: messages, state events (join/leave), etc. These are permanently stored in the database.</li> +<li>EDU (Ephemeral Data Unit) - other data, which need not be stored permanently, such as read receipts, typing notifications.</li> +</ul> +<p>The "Outgoing EDUs by type" chart shows the EDUs within outgoing federation requests by type: <code>m.device_list_update</code>, <code>m.direct_to_device</code>, <code>m.presence</code>, <code>m.receipt</code>, <code>m.typing</code>.</p> +<p>If you see a large number of <code>m.presence</code> EDUs and are having trouble with too much CPU load, you can disable <code>presence</code> in the Synapse config. See also <a href="https://github.com/matrix-org/synapse/issues/3971">#3971</a>.</p> +<h2 id="caches"><a class="header" href="#caches">Caches</a></h2> +<p><img src="https://user-images.githubusercontent.com/1342360/82240572-8b239180-9932-11ea-96ff-6b5f0e57ebe5.png" alt="image" /></p> +<p><img src="https://user-images.githubusercontent.com/1342360/82240666-b8703f80-9932-11ea-86af-9f663988d8da.png" alt="image" /></p> +<p>This is quite a useful graph. It shows how many times Synapse attempts to retrieve a piece of data from a cache which the cache did not contain, thus resulting in a call to the database. We can see here that the <code>_get_joined_profile_from_event_id</code> cache is being requested a lot, and often the data we're after is not cached.</p> +<p>Cross-referencing this with the Eviction Rate graph, which shows that entries are being evicted from <code>_get_joined_profile_from_event_id</code> quite often:</p> +<p><img src="https://user-images.githubusercontent.com/1342360/82240766-de95df80-9932-11ea-8c15-5acfc57c48da.png" alt="image" /></p> +<p>we should probably consider raising the size of that cache by raising its cache factor (a multiplier value for the size of an individual cache). Information on doing so is available <a href="https://github.com/matrix-org/synapse/blob/ee421e524478c1ad8d43741c27379499c2f6135c/docs/sample_config.yaml#L608-L642">here</a> (note that the configuration of individual cache factors through the configuration file is available in Synapse v1.14.0+, whereas doing so through environment variables has been supported for a very long time). Note that this will increase Synapse's overall memory usage.</p> +<h2 id="forward-extremities"><a class="header" href="#forward-extremities">Forward Extremities</a></h2> +<p><img src="https://user-images.githubusercontent.com/1342360/82241440-13566680-9934-11ea-8b88-ba468db937ed.png" alt="image" /></p> +<p>Forward extremities are the leaf events at the end of a DAG in a room, aka events that have no children. The more that exist in a room, the more <a href="https://spec.matrix.org/v1.1/server-server-api/#room-state-resolution">state resolution</a> that Synapse needs to perform (hint: it's an expensive operation). While Synapse has code to prevent too many of these existing at one time in a room, bugs can sometimes make them crop up again.</p> +<p>If a room has >10 forward extremities, it's worth checking which room is the culprit and potentially removing them using the SQL queries mentioned in <a href="https://github.com/matrix-org/synapse/issues/1760">#1760</a>.</p> +<h2 id="garbage-collection"><a class="header" href="#garbage-collection">Garbage Collection</a></h2> +<p><img src="https://user-images.githubusercontent.com/1342360/82241911-da6ac180-9934-11ea-9a0d-a311fe22acd0.png" alt="image" /></p> +<p>Large spikes in garbage collection times (bigger than shown here, I'm talking in the +multiple seconds range), can cause lots of problems in Synapse performance. It's more an +indicator of problems, and a symptom of other problems though, so check other graphs for what might be causing it.</p> +<h2 id="final-thoughts"><a class="header" href="#final-thoughts">Final Thoughts</a></h2> +<p>If you're still having performance problems with your Synapse instance and you've +tried everything you can, it may just be a lack of system resources. Consider adding +more CPU and RAM, and make use of <a href="../../workers.html">worker mode</a> +to make use of multiple CPU cores / multiple machines for your homeserver.</p> + + </main> + + <nav class="nav-wrapper" aria-label="Page navigation"> + <!-- Mobile navigation buttons --> + <a rel="prev" href="../../usage/administration/monthly_active_users.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + <a rel="next" href="../../usage/administration/useful_sql_for_admins.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + <div style="clear: both"></div> + </nav> + </div> + </div> + + <nav class="nav-wide-wrapper" aria-label="Page navigation"> + <a rel="prev" href="../../usage/administration/monthly_active_users.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + <a rel="next" href="../../usage/administration/useful_sql_for_admins.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + </nav> + + </div> + + <script type="text/javascript"> + window.playground_copyable = true; + </script> + <script src="../../elasticlunr.min.js" type="text/javascript" charset="utf-8"></script> + <script src="../../mark.min.js" type="text/javascript" charset="utf-8"></script> + <script src="../../searcher.js" type="text/javascript" charset="utf-8"></script> + <script src="../../clipboard.min.js" type="text/javascript" charset="utf-8"></script> + <script src="../../highlight.js" type="text/javascript" charset="utf-8"></script> + <script src="../../book.js" type="text/javascript" charset="utf-8"></script> + + <!-- Custom JS scripts --> + <script type="text/javascript" src="../../docs/website_files/table-of-contents.js"></script> + </body> +</html> \ No newline at end of file |