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sampling for GenerateCacheHitReport - reduce cpu cost

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Lordfox
2025-10-04 10:33:32 +02:00
parent c9905891cf
commit 30f7891e92
1 changed files with 32 additions and 4 deletions
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modules/OpenSimConcurrentFlotsamAssetCache/addon-modules/OpenSimConcurrentFlotsamAssetCache/Modules/ConcurrentFlotsamAssetCache.cs
+32 -4
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@@ -1428,16 +1428,44 @@ namespace OpenSim.Region.CoreModules.Asset
double invReq = 100.0 / Math.Max(1UL, m_Requests);
double weakHitRate = m_weakRefHits * invReq;
int weakEntriesAlive = 0;
foreach (WeakReference aref in weakAssetReferences.Values)
if (aref.IsAlive) ++weakEntriesAlive;
// Sample-based alive counting to reduce CPU cost on large maps
int weakEntries = weakAssetReferences.Count;
int weakEntriesAliveSampled = 0;
int sampled = 0;
const int sampleTarget = 2000; // sample up to this many entries
int sampleStep = 1;
if (weakEntries > sampleTarget && sampleTarget > 0)
{
// stride to visit ~sampleTarget entries
sampleStep = Math.Max(1, weakEntries / sampleTarget);
}
int index = 0;
foreach (var kv in weakAssetReferences)
{
if ((index++ % sampleStep) != 0)
continue;
if (kv.Value.TryGetTarget(out _))
weakEntriesAliveSampled++;
sampled++;
if (sampled >= sampleTarget)
break; // cap the work even if map grows while iterating
}
int weakEntriesAlive = weakEntries == 0 || sampled == 0
? 0
: (int)Math.Round((double)weakEntriesAliveSampled / sampled * weakEntries);
double fileHitRate = m_DiskHits * invReq;
double TotalHitRate = weakHitRate + fileHitRate;
outputLines.Add($"Total requests: {m_Requests}");
outputLines.Add($"unCollected Hit Rate: {weakHitRate:0.00}% ({weakEntries} entries {weakEntriesAlive} alive)");
outputLines.Add($"unCollected Hit Rate: {weakHitRate:0.00}% ({weakEntries} entries ~{weakEntriesAlive} alive [sampled {sampled}])");
outputLines.Add($"File Hit Rate: {fileHitRate:0.00}%");
if (m_MemoryCacheEnabled)