public static bool IsEarlyOutOfMemory(MemoryInfoResult memInfo, out Size commitChargeThreshold)
{
if (PlatformDetails.RunningOnPosix && // we only _need_ this check on Windows
EnableEarlyOutOfMemoryCheck == false) // but we want to enable this manually if needed
{
commitChargeThreshold = Size.Zero;
return(false);
}
return(IsEarlyOutOfMemoryInternal(memInfo, earlyOutOfMemoryWarning: true, out commitChargeThreshold));
}
private static bool IsEarlyOutOfMemoryInternal(MemoryInfoResult memInfo, bool earlyOutOfMemoryWarning, out Size commitChargeThreshold)
{
// if we are about to create a new thread, might not always be a good idea:
// https://ayende.com/blog/181537-B/production-test-run-overburdened-and-under-provisioned
// https://ayende.com/blog/181569-A/threadpool-vs-pool-thread
Size overage;
if (memInfo.CurrentCommitCharge > memInfo.TotalCommittableMemory)
{
// this can happen on containers, since we get this information from the host, and
// sometimes this kind of stat is shared, see:
// https://fabiokung.com/2014/03/13/memory-inside-linux-containers/
commitChargeThreshold = GetMinCommittedToKeep(memInfo.TotalPhysicalMemory);
overage =
commitChargeThreshold + //extra to keep free
(memInfo.TotalPhysicalMemory - memInfo.AvailableMemory); //actually in use now
return(overage >= memInfo.TotalPhysicalMemory);
}
commitChargeThreshold = GetMinCommittedToKeep(memInfo.TotalCommittableMemory);
overage = commitChargeThreshold + memInfo.CurrentCommitCharge;
return(overage >= memInfo.TotalCommittableMemory);
Size GetMinCommittedToKeep(Size currentValue)
{
var minFreeToKeep = Size.Min(_maxFreeCommittedMemoryToKeep, currentValue * _minimumFreeCommittedMemoryPercentage);
if (earlyOutOfMemoryWarning)
{
return(Size.Min(
_lowMemoryCommitLimitInMb,
// needs to be bigger than the MaxFreeCommittedMemoryToKeep
Size.Max(currentValue / 20, minFreeToKeep * 1.5)));
}
return(minFreeToKeep);
}
}
private static void ThrowInsufficientMemory(MemoryInfoResult memInfo)
{
LowMemoryNotification.Instance.SimulateLowMemoryNotification();
throw new EarlyOutOfMemoryException($"The amount of available memory to commit on the system is low. Commit charge: {memInfo.CurrentCommitCharge} / {memInfo.TotalCommittableMemory}. Memory: {memInfo.TotalPhysicalMemory - memInfo.AvailableMemory} / {memInfo.TotalPhysicalMemory}");
}
public abstract bool IsEarlyOutOfMemory(MemoryInfoResult memInfo, out Size commitChargeThreshold);
public EarlyOutOfMemoryException(string message, MemoryInfoResult memoryInfo) : base(message)
{
MemoryInfo = memoryInfo;
}
private static void ThrowInsufficentMemory(MemoryInfoResult memInfo)
{
throw new InsufficientExecutionStackException($"The amount of available memory to commit on the system is low. Commit charge: {memInfo.CurrentCommitCharge} / {memInfo.TotalCommittableMemory}. Memory: {memInfo.TotalPhysicalMemory - memInfo.AvailableMemory} / {memInfo.TotalPhysicalMemory}" +
$" Will not create a new thread in this situation because it may result in a stack overflow error when trying to allocate stack space but there isn't sufficient memory for that.");
}