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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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GIT-PRUNE(1)							    Git Manual							      GIT-PRUNE(1)

NAME
git-prune - Prune all unreachable objects from the object database SYNOPSIS
git prune [-n] [-v] [--expire <expire>] [--] [<head>...] DESCRIPTION
Note In most cases, users should run git gc, which calls git prune. See the section "NOTES", below. This runs git fsck --unreachable using all the refs available in refs/, optionally with additional set of objects specified on the command line, and prunes all unpacked objects unreachable from any of these head objects from the object database. In addition, it prunes the unpacked objects that are also found in packs by running git prune-packed. Note that unreachable, packed objects will remain. If this is not desired, see git-repack(1). OPTIONS
-n Do not remove anything; just report what it would remove. -v Report all removed objects. -- Do not interpret any more arguments as options. --expire <time> Only expire loose objects older than <time>. <head>... In addition to objects reachable from any of our references, keep objects reachable from listed <head>s. EXAMPLE
To prune objects not used by your repository nor another that borrows from your repository via its .git/objects/info/alternates: .ft C $ git prune $(cd ../another && $(git rev-parse --all)) .ft NOTES
In most cases, users will not need to call git prune directly, but should instead call git gc, which handles pruning along with many other housekeeping tasks. For a description of which objects are considered for pruning, see git fsck's --unreachable option. SEE ALSO
git-fsck(1), git-gc(1), git-reflog(1) AUTHOR
Written by Linus Torvalds <torvalds@osdl.org[1]> DOCUMENTATION
Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel.org[2]>. GIT
Part of the git(1) suite NOTES
1. torvalds@osdl.org mailto:torvalds@osdl.org 2. git@vger.kernel.org mailto:git@vger.kernel.org Git 1.7.1 07/05/2010 GIT-PRUNE(1)
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