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UE4 - If the number of physical cores is greater than 4 and not equal to the number of logical cores, then use the average of the two core counts for the number of parallel compiles.

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[CL 2579870 by Gil Gribb in Main branch]
This commit is contained in:
Gil Gribb
2015-06-08 09:25:56 -04:00
committed by gil.gribb@epicgames.com
parent 87f1c0c0d4
commit a5393497b9
1 changed files with 10 additions and 3 deletions
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13
Engine/Source/Programs/UnrealBuildTool/System/LocalExecutor.cs
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@@ -363,10 +363,17 @@ namespace UnrealBuildTool
}
// The number of actions to execute in parallel is trying to keep the CPU busy enough in presence of I/O stalls.
int MaxActionsToExecuteInParallel = 0;
// The CPU has more logical cores than physical ones, aka uses hyper-threading.
if( NumCores < System.Environment.ProcessorCount )
if (NumCores < System.Environment.ProcessorCount && BuildConfiguration.ProcessorCountMultiplier != 1.0)
{
MaxActionsToExecuteInParallel = (int) (NumCores * BuildConfiguration.ProcessorCountMultiplier);
// The CPU has more logical cores than physical ones, aka uses hyper-threading.
// Use multiplier if provided
MaxActionsToExecuteInParallel = (int)(NumCores * BuildConfiguration.ProcessorCountMultiplier);
}
else if (NumCores < System.Environment.ProcessorCount && NumCores > 4)
{
// The CPU has more logical cores than physical ones, aka uses hyper-threading.
// Use average of logical and physical if we have "lots of cores"
MaxActionsToExecuteInParallel = (int)(NumCores + System.Environment.ProcessorCount) / 2;
}
// No hyper-threading. Only kicking off a task per CPU to keep machine responsive.
else