About SharePoint with 16+ Cores


Well, If you update .Net 4.7.2 or higer it is OK, otherwise it is a bad idea.

More speficially,
ReaderWriterLockSlim with reentrant have design limitation which can lead serious performance down for previous .Net versions. And Sharepoint pretty much depended on this thread syncronization object. Specially Blob Cache and ObjectCache wraps and using them. More CPU causes more thread contention, excesive locking thats brings slowness.

Example callstacks:
SPReaderWriterLock named [BlobCache] waited 43992 milliseconds to acquire lock. Call stack:
at Microsoft.Office.Server.Utilities.SPReaderWriterLock.AcquireLock(Boolean readerLock, Boolean upgradable, Boolean throwException)
at Microsoft.Office.Server.Utilities.SPReaderWriterLock.AcquireLock(Boolean readerLock, Boolean upgradable)

System_Core_ni!System.Threading.ReaderWriterLockSlim.EnterMyLockSpin()
System_Core_ni!System.Threading.ReaderWriterLockSlim.TryEnterWriteLock(Int32)
Microsoft_Office_Server!Microsoft.Office.Server.Utilities.SPReaderWriterLock.AcquireLock(Boolean, Boolean)
Microsoft_Office_Server!Microsoft.Office.Server.ObjectCache.SPCache+MossObjectCache.UpdateUsageMap(System.String, UInt32, UInt32)
Here are some threads about the problem.
https://github.com/dotnet/coreclr/pull/13243
https://github.com/dotnet/coreclr/pull/13495

These issues has been fixed with .Net Framework 4.7.2 version!.

Pls check .NET Framework 4.7.2 Release Notes
https://github.com/Microsoft/dotnet/blob/master/releases/net472/dotnet472-changes.md

Again don’t think about 64cpus makes more performance. It depends of the software boundaries/limitations and several other things..
My suggestion, scale up with multiple machines. It is more cheaper and stable. ! Not with excessive hardwares. (8 cores are fine 🙂 )

If you have that monster machines, don’t worry you can  use it with HyperV and scale up VMs.

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About bpostaci
Escalation Engineer in Microsoft.

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