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    <pre><code>GCLatencyMode oldMode = GCSettings.LatencyMode; // Make sure we can always go to the catch block, // so we can set the latency mode back to `oldMode` RuntimeHelpers.PrepareConstrainedRegions(); try { GCSettings.LatencyMode = GCLatencyMode.LowLatency; // Generation 2 garbage collection is now // deferred, except in extremely low-memory situations } finally { // ALWAYS set the latency mode back GCSettings.LatencyMode = oldMode; } </code></pre> <p>That will allow you to disable the GC as much as you can. It won't do any large collections of objects until:</p> <ul> <li>You call <code>GC.Collect()</code></li> <li>You set <code>GCSettings.LatencyMode</code> to something other than <code>LowLatency</code></li> <li>The OS sends a low-memory signal to the CLR</li> </ul> <p>Please be careful when doing this, because memory usage can climb extremely fast while you're in that <code>try</code> block. If the GC is collecting, it's doing it for a reason, and you should only seriously consider this if you have a large amount of memory on your system.</p> <p>In reference to question three, perhaps you can try reusing objects like byte arrays if you're receiving information through filesystem I/O or a network? If you're parsing that information into custom classes, try reusing those too, but I can't give too much good advice without knowing more about what exactly you're doing.</p> <p>Here are some MSDN articles that can help too:</p> <ul> <li><a href="http://msdn.microsoft.com/en-us/library/bb384202.aspx">Latency Modes</a></li> <li><a href="http://msdn.microsoft.com/en-us/library/ms228973.aspx">Constrained Execution Regions</a> (this is why we call <code>PrepareConstrainedRegions()</code>)</li> </ul> <p><strong>Note:</strong> <code>GCSettings.LatencyMode = GCLatencyMode.LowLatency</code> can only be set if <code>GCSettings.IsServerGC == false</code>. <code>IsServerGC</code> can be changed in <code>App.config</code>:</p> <pre><code> &lt;runtime&gt; &lt;gcServer enabled="false" /&gt; &lt;/runtime&gt; </code></pre>
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    1. POPrevent .NET Garbage collection for short period of time
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    1. COA few questions if you don't mind. 1. I know the general period of time when a critical event will happen, but it will be triggered from a data element being recieved from a multicast broadcast. I want to prevent the GC from delaying the reciept of that data. What do you recomend? 2. Is there a performance hit as you enter either the ConstrainedRegion or switch to LowLatency mode? Could this be done as soon as I see a specific data item without taking an entry performance hit? BTW, very useful stuff - Thanks.
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    2. COFor 1, I'd say if the general period of time is small, on the order of a few seconds, then you could probably set the GC to `LowLatency` until the message arrives. Any longer than that, and I'd say there isn't much you can do to my knowledge. If you absolutely must have no GC delay, you could try to receive the broadcast in another process and then marshal it over to your main process, but that complicates things significantly. For 2, entering a CER I believe comes with a performance hit as you enter and exit it, but I've never measured it, nor setting the latency mode myself.
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