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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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PMPRINTVALUE(3) 					     Library Functions Manual						   PMPRINTVALUE(3)

NAME
pmPrintValue - print a performance metric value C SYNOPSIS
#include <stdio.h> #include <pcp/pmapi.h> void pmPrintValue(FILE *f, int valfmt, int type, const pmValue *val, int minwidth); cc ... -lpcp DESCRIPTION
The value of a single performance metric (as identified by val) is printed on the standard I/O stream identified by f. The value of the performance metric is interpreted according to the format of val as defined by valfmt (from a pmValueSet within a pmResult structure; see pmFetch(3)) and the generic description of the metrics type passed in via type. The value for type is typically extracted from a pmDesc structure, following a call to pmLookupDesc(3) for a particular performance metric. The output will be optionally padded to be at least minwidth characters wide. pmPrintValue is most useful for displaying values of performance metrics from pmFetch(3) (which returns a set of valfmt and val pairs for each requested metric), based upon the metrics type as returned from pmLookupDesc(3). SEE ALSO
PMAPI(3), pmAtomStr(3), pmConvScale(3), pmExtractValue(3), pmFetch(3), pmLookupDesc(3), pmTypeStr(3) and pmUnitsStr(3). Performance Co-Pilot PCP PMPRINTVALUE(3)
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