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POMonodroid: Performing a full GC
 

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    <p>I try to create my small particle system. I have ParticleManager with list of Particles and draw my particles on canvas. I create any new objects like Paint and etc once just in init() function! If particle size is &lt; 0, I remove it:</p> <pre><code>for (int particle = 0; particle &lt; particles.Count; particle++) { particles[particle].Update(); //particle size--; if (!particles[particle].state) // size &gt; 0 ? true : false { particles[particle] = null; //here I tried all variations like //((IDisposable)particles[particle]).Dispose(); //GC.SuppressFinalize(particles[particle]); //System.GC.ReRegisterForFinalize(particles[particle]); //((Java.Lang.Object)particles[particle]).Dispose(); and etc particles.Remove(particles[particle]); } </code></pre> <p>Then I create new Particle and add it to my list. What I see in my log:</p> <pre><code>GC cleanup summary: 1063 objects tested - resurrecting 1002. GC cleanup summary: 1053 objects tested - resurrecting 992. ... GC cleanup summary: 1052 objects tested - resurrecting 988. 46800 outstanding GREFs. Performing a full GC! </code></pre> <p>And then I have 10-15(!!!) second pause in my render thread!!! I read official documentation, but it hasn't any solution. I analysed and compared my code with mono JetBoy example, but JetBoy's log hasn't anything about GC. Although I wrote my program with JetBoy's example. How to fix full GC problem?</p> <hr> <p>Edit: MainThread.cs</p> <pre><code>public override void Run() { Log.Verbose("Run()", "r"); Canvas c; while (mRun) { c = null; mPassedTime = DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond; if (mTimerTask == null) { mTimerTask = new CountDownTimerTask(this); mTimer.Schedule(mTimerTask, mTaskIntervalInMillis); } try { c = mSurfaceHolder.LockCanvas(null); lock (mSurfaceHolder) DoDrawRunning(c); } finally { if (c != null) mSurfaceHolder.UnlockCanvasAndPost(c); } } } private void DoDrawRunning(Canvas canvas) { #region particles for (int eng = 0; eng &lt; engines.Count; eng++) { engines[eng].Update(); engines[eng].Draw(canvas); } #endregion } </code></pre> <p>ParticleEnginee.cs</p> <pre><code>public void Update() { if (particles.Count &lt; maxTotal) { for (int i = 0; i &lt; total; i++) { if (addNewB) particles.Add(GenerateNewParticle()); // return new Particle } } for (int particle = 0; particle &lt; particles.Count; particle++) { particles[particle].Update(); // position and size update if (!particles[particle].state) // size &gt; 0 ? particles.RemoveAt(particle); } } public void Draw(Canvas canvas) { for (int j = 0; j &lt; 3; j++) // 3 particle color-levels draw for (int index = 0; index &lt; particles.Count; index++) particles[index].Draw(canvas, j); } </code></pre> <p>Particle.cs</p> <pre><code>public void Draw(Canvas canvas) { mPaint.StrokeWidth = mSize; mPaint.Color = Color.Blue; canvas.DrawPoint(posX, posY, mPaint); } </code></pre>
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    1. COHave you tried to manually call GC.Collect() periodically? (in your render thread for instance) see http://docs.xamarin.com/guides/android/advanced_topics/garbage_collection#Helping_the_GC
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    2. COYou should use weak WeakReference class for your particles
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    3. CO@Julien, yes and it's give me lags. To Greensy: good idea, I'll try it
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