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<p>Hi Eliel,</p>
<p><br>
</p>
<p>I am not aware of such a parameter in SCIP. The closest one is the parameter:<br>
</p>
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<span style="font-size: 10pt;"> <br>
</span><span style="font-size: 10pt;">limits/</span><span style="font-size: 10pt;">stallnodes solving stops, if the given number of nodes was processed since the last improvement of the primal solution value (-1: no limit) [-1]</span></div>
<br>
Here are some other SCIP parameters that may enable a fair comparison of the two solvers.<br>
<p></p>
<div><br>
</div>
<div><span style="font-size: 10pt;"> </span><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 10pt;">limits/</span><span style="font-size: 10pt;">absgap
solving stops, if the absolute gap = |primalbound - dualbound| is below the given value [0.0]</span></div>
<div><span style="font-size: 12pt;"><span style="font-size: 10pt;"> </span><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 10pt;">limits/</span><span style="font-size: 10pt;">bestsol
solving stops, if the given number of solution improvements were found (-1: no limit) [-1]</span></span><br>
</div>
<div><span style="font-size: 10pt;"> </span><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 10pt;">limits/</span><span style="font-size: 10pt;">gap
solving stops, if the relative gap = |primal - dual|/MIN(|dual|,|primal|) is below the given value, the gap is 'Infinity', if primal and dual bound have opposite signs [0.0]</span></div>
<div><span style="font-size: 12pt;"><span style="font-size: 10pt;"> </span><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 10pt;">limits/</span><span style="font-size: 10pt;">nodes
maximal number of nodes to process (-1: no limit) [-1]</span></span><br>
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<div><span style="font-size: 10pt;"> </span><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 10pt;">limits/</span><span style="font-size: 10pt;">objective
set limit on objective function, such that only solutions better than this limit are accepted</span></div>
<div><span style="font-size: 12pt;"><span style="font-size: 10pt;"> </span><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 10pt;">limits/</span><span style="font-size: 10pt;">softtime
soft time limit which should be applied after first solution was found (-1.0: disabled) [-1.0]</span></span><br>
</div>
<div><span style="font-size: 10pt;"> </span><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 10pt;">limits/</span><span style="font-size: 10pt;">solutions
solving stops, if the given number of solutions were found (-1: no limit) [-1]</span></div>
<div><span style="font-size: 10pt;"> </span><span style="font-size: 10pt;">limits/</span><span style="font-size: 10pt;">time maximal time in seconds to run [1e+20]</span><br>
</div>
<div><span style="font-size: 10pt;"> </span><span style="font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 10pt;">limits/</span><span style="font-size: 10pt;">totalnodes
maximal number of total nodes (incl. restarts) to process (-1: no limit) [-1]</span></div>
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I hope this helps.<br>
<br>
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Best regards,
<p></p>
<div>Gioni</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>Von:</b> Scip <scip-bounces@zib.de> im Auftrag von Eliel Dzik <edzik@wiremind.io><br>
<b>Gesendet:</b> Mittwoch, 9. August 2023 09:14:07<br>
<b>An:</b> scip@zib.de<br>
<b>Betreff:</b> [SCIP] Time since last improvement</font>
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<p>Hello,</p>
<p>I am a SCIP user and I'm wondering if there is a parameter or a way to set a stopping condition for when x seconds have passed since the last improvement of the solution, even if the current solution is not optimal. I know that other solvers have implemented
this feature, and I have searched forums for information on how to do this in SCIP but have not found any.</p>
<p>My task is to compare two solvers, and SCIP is one of them. Although it is often faster than its competitor, for most complex cases it is worse because it waits until reaching the time limit, whereas its competitor can stop earlier.</p>
<p>Thanks for your helpful documentation, I hope you will be able to answer my questions.</p>
<p>Best regards,</p>
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