Martino FerrariandClaude Opus 4.6
1627abcd4a
Converts every --buffer-mb / buffer_mb mention to --buffer-samples / buffer_samples, records the unit change as a deviation (README, SPECS, CLAUDE.md), documents the buffer: and planner: dump lines and the new Preferences row, and updates the help pages and the help-shot script. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
94 lines
4.8 KiB
Plaintext
94 lines
4.8 KiB
Plaintext
<page xmlns="http://projectmallard.org/1.0/"
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type="topic" style="task"
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id="sessions">
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<info>
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<link type="guide" xref="index#output"/>
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<link type="seealso" xref="source"/>
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<desc>Per-source configuration files: where they live, what they persist, and how the
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chooser and the Configurations dialog use them.</desc>
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<credit type="author copyright">
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<name>Martino Ferrari</name>
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</credit>
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</info>
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<title>Sessions and settings</title>
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<p>udpscope stores named sessions — <em>configurations</em> — per source, so reopening a
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source gives you the scope you closed, and one source can hold several arrangements for
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different experiments. There is no global preferences file: the session <em>is</em> the
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settings.</p>
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<section id="reach">
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<title>How to reach it</title>
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<p>Nothing to open — the file is written as you work. Its path is in the About dialog, and
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the directory is <file>$XDG_CONFIG_HOME/udpscope</file>, or <file>~/.config/udpscope</file>
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when that is unset. Each source has a directory <file><host>_<port>/</file>
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holding one <file><name>.toml</file> per configuration and an <file>active</file>
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file naming the one it is on.</p>
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</section>
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<section id="configs">
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<title>Configurations</title>
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<p><gui>Configurations…</gui> in the menu lists the running source's configurations: click
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a row to open it, <gui>×</gui> to delete it, or type a name and a note and press
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<gui>Save this session</gui> to keep the current arrangement under a new one. Opening a
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configuration saves the current session first, so switching never loses what it switches
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from.</p>
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<p>The startup chooser (start with no <cmd>--server</cmd>) lists one row per configuration,
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with its note and its settings, so two arrangements of one source are told apart before
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they open.</p>
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<p>A configuration also carries the settings that can only be decided when the buffers are
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allocated: the <gui>samples per signal</gui> (<cmd>--buffer-samples</cmd>), relative time, and the
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packet capture's ring size. Opening a configuration from the chooser applies all three;
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switching inside a running app applies the rest and says in the status line that these take
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effect on the next start.</p>
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<p>The chooser's form sets the first two for a new host, and its pencil button edits them
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on an existing configuration — along with the name and the note. Renaming a configuration,
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or editing the address it points at, moves it: the old file is removed rather than left
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behind.</p>
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</section>
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<section id="knowing">
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<title>Worth knowing</title>
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<list>
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<item><p>What a configuration persists: the time window, the rows and each row's slot
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signals, the calibration, the trace colours, which signals were enabled, the math
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channels with their graphs, the measurements pane — and the startup settings: samples
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per signal, relative time and the packet capture's ring size.</p></item>
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<item><p>Signal identity is the <em>name</em> throughout, because a new CONFIG renumbers
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the channels.</p></item>
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<item><p>A file written by a run against a source whose streamer was down would name no
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signals at all, so such a run does <em>not</em> write: a configured session is never
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overwritten by a run that configured nothing. (The chooser hides such a file for the same
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reason.)</p></item>
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<item><p>The multicast group and the interface live <em>inside</em> the file, because its
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name cannot carry them. A file from an older build has neither key and loads as unicast
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on the default route.</p></item>
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<item><p>The chooser lists only configurations that name at least one signal, which is
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what keeps it the sessions you configured rather than every port you have ever tested
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against.</p></item>
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<item><p>Deleting a configuration is a supported way to start over; the chooser's
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<gui>×</gui> and the dialog's do exactly that.</p></item>
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<item><p>A session from before configurations existed is imported once as the
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configuration <code>default</code>, and the old file is kept beside the directory as
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<file><host>_<port>.toml.imported</file>.</p></item>
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</list>
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</section>
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<section id="example">
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<title>Example</title>
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<p>Connect to <code>127.0.0.1:8000</code>, drop three signals on row 1, set a 2 s window,
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and save the session as <code>bench</code> with a note.
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<file>~/.config/udpscope/127.0.0.1_8000/bench.toml</file> now holds
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<code>window_s=2 comment="…"</code> with
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<code>signals = ["sine", "ramp", "noise", ""]</code>, and the next run reports
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<code>layout loaded from …/127.0.0.1_8000/bench.toml</code> with those signals already
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acquired.</p>
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</section>
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</page>
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