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The Lounge War Stories Linus Torvalds reply about Meltdown and Spectre. Post 303012275 by Corona688 on Thursday 1st of February 2018 04:07:36 PM
Old 02-01-2018
Quote:
Originally Posted by dodona
I read that with the 4.15 Kernel with build-in patches for the hypothetical problem comes with 15-30% performance loss.
That's way overblown, because the performance loss happens during the switch between userspace and kernelspace. Sensible programs don't spend most of their time doing thousands of tiny system calls.

A 30% reduction in performance there is bad, but not the same as a 30% slower computer.
 

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MPSCNNLossDataDescriptor(3)				 MetalPerformanceShaders.framework			       MPSCNNLossDataDescriptor(3)

NAME
MPSCNNLossDataDescriptor SYNOPSIS
#import <MPSCNNLoss.h> Inherits NSObject, and <NSCopying>. Instance Methods (nonnull instancetype) - init Class Methods (nullable MPSCNNLossDataDescriptor *) + cnnLossDataDescriptorWithData:layout:size: Properties MPSDataLayout layout MTLSize size NSUInteger bytesPerRow NSUInteger bytesPerImage Detailed Description This depends on Metal.framework. The MPSCNNLossDataDescriptor specifies a loss data descriptor. The same descriptor can be used to initialize both the labels and the optional weights data. Method Documentation + (nullable MPSCNNLossDataDescriptor*) cnnLossDataDescriptorWithData: (NSData *__nonnull) data(MPSDataLayout) layout(MTLSize) size Make a descriptor loss data. The bytesPerRow and bytesPerImage are automatically calculated assuming a dense array. If it is not a dense array, adjust bytesPerRow and bytesPerImage to the right value by changing properties. Parameters: data The per-element loss data. The data must be in floating point format. layout The data layout of loss data. size The size of loss data. Returns: A valid MPSCNNLossDataDescriptor object or nil, if failure. - (nonnull instancetype) init Property Documentation - bytesPerImage [read], [write], [nonatomic], [assign] Slice bytes of loss data. This parameter specifies the slice bytes of loss data. - bytesPerRow [read], [write], [nonatomic], [assign] Row bytes of loss data. This parameter specifies the row bytes of loss data. - layout [read], [nonatomic], [assign] Data layout of loss data. See MPSImage.h for more information. This parameter specifies the layout of loss data. - size [read], [nonatomic], [assign] Size of loss data: (width, height, feature channels}. This parameter specifies the size of loss data. Author Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code. Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSCNNLossDataDescriptor(3)
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