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Optimize max number of Pathfinding threads for high core/thread count CPUs #1744

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May 23, 2023
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Optimize max number of Pathfinding threads for high core/thread count CPUs #1744

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10 changes: 6 additions & 4 deletions TLM/TLM/Custom/PathFinding/CustomPathManager.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -146,12 +146,14 @@ public void UpdateWithPathManagerValues(PathManager stockPathManager) {
PathFind[] stockPathFinds = GetComponents<PathFind>();
int numOfStockPathFinds = stockPathFinds.Length;
// utilize more threads if possible (systems with 8+) otherwise use vanilla calculation
int numCustomPathFinds = SystemInfo.processorCount < 8
? Mathf.Max(SystemInfo.processorCount / 2, 1)
: SystemInfo.processorCount - 4;
// <=8t CPU -> 1..4 PT threads (vanilla)
// 10t CPU -> 5 PT threads
// 16t CPU -> 8 PT threads (2x vanilla)
// >=20t CPU -> 10 PT threads
int numCustomPathFinds = Mathf.Clamp(SystemInfo.processorCount / 2, 1, 10);
simSleepMultiplier_ = CalculateBestSimSleepMultiplier(numCustomPathFinds);

Log._Debug("Creating " + numCustomPathFinds + " custom PathFind objects. Number of stock Pathfinds " +numOfStockPathFinds);
Log._Debug($"Detected {SystemInfo.processorCount} CPU thread(s). Creating {numCustomPathFinds} custom PathFind objects. Number of stock Pathfinds {numOfStockPathFinds}");
_replacementPathFinds = new CustomPathFind[numCustomPathFinds];
FieldInfo f_pathfinds = typeof(PathManager).GetField(
"m_pathfinds",
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