From 2ad64644b9290ed1b63108b01ef63939adba5a93 Mon Sep 17 00:00:00 2001 From: Thomas Schwinge Date: Sat, 26 Mar 2011 01:29:05 +0100 Subject: Re-integrate GSoC pages with the non-GSoC world. Remove duplicates, apart from procfs, which should rather be removed from the GSoC items. --- open_issues/performance/io_system.mdwn | 50 ---------------------- .../performance/io_system/binutils_ld_64ksec.mdwn | 5 ++- .../io_system/clustered_page_faults.mdwn | 2 + open_issues/performance/io_system/read-ahead.mdwn | 2 + 4 files changed, 7 insertions(+), 52 deletions(-) delete mode 100644 open_issues/performance/io_system.mdwn (limited to 'open_issues/performance') diff --git a/open_issues/performance/io_system.mdwn b/open_issues/performance/io_system.mdwn deleted file mode 100644 index 8535eae3..00000000 --- a/open_issues/performance/io_system.mdwn +++ /dev/null @@ -1,50 +0,0 @@ -[[!meta copyright="Copyright © 2008, 2009, 2010, 2011 Free Software Foundation, -Inc."]] - -[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable -id="license" text="Permission is granted to copy, distribute and/or modify this -document under the terms of the GNU Free Documentation License, Version 1.2 or -any later version published by the Free Software Foundation; with no Invariant -Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license -is included in the section entitled [[GNU Free Documentation -License|/fdl]]."]]"""]] - -[[!meta title="I/O System"]] - -[[!tag open_issue_hurd gsoc-task]] - -The most obvious reason for the Hurd feeling slow compared to mainstream -systems like GNU/Linux, is a low I/O system performance, in particular very -slow hard disk access. - -The reason for this slowness is lack and/or bad implementation of common -optimization techniques, like scheduling reads and writes to minimize head -movement; effective block caching; effective reads/writes to partial blocks; -[[reading/writing multiple blocks at once|clustered_page_faults]]; and -[[read-ahead]]. The -[[ext2_filesystem_server|hurd/translator/ext2fs]] might also need some -optimizations at a higher logical level. - -The goal of this project is to analyze the current situation, and implement/fix -various optimizations, to achieve significantly better disk performance. It -requires understanding the data flow through the various layers involved in -disk access on the Hurd ([[filesystem|hurd/virtual_file_system]], -[[pager|hurd/libpager]], driver), and general experience with -optimizing complex systems. That said, the killing feature we are definitely -missing is the [[read-ahead]], and even a very simple implementation would bring -very big performance speedups. - -Here are some real testcases: - - * [[binutils_ld_64ksec]]; - - * running the Git testsuite which is mostly I/O bound; - - * use [[TopGit]] on a non-toy repository. - - -Possible mentors: Samuel Thibault (youpi) - -Exercise: Look through all the code involved in disk I/O, and try something -easy to improve. It's quite likely though that you will find nothing obvious -- -in this case, please contact us about a different exercise task. diff --git a/open_issues/performance/io_system/binutils_ld_64ksec.mdwn b/open_issues/performance/io_system/binutils_ld_64ksec.mdwn index b59a87a7..79c2300f 100644 --- a/open_issues/performance/io_system/binutils_ld_64ksec.mdwn +++ b/open_issues/performance/io_system/binutils_ld_64ksec.mdwn @@ -1,4 +1,4 @@ -[[!meta copyright="Copyright © 2010 Free Software Foundation, Inc."]] +[[!meta copyright="Copyright © 2010, 2011 Free Software Foundation, Inc."]] [[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable id="license" text="Permission is granted to copy, distribute and/or modify this @@ -10,7 +10,8 @@ License|/fdl]]."]]"""]] [[!tag open_issue_hurd]] -This one may be considered as a testcase for I/O system optimization. +This one may be considered as a testcase for [[I/O system +optimization|community/gsoc/project_ideas/disk_io_performance]]. It is taken from the [[binutils testsuite|binutils]], `ld/ld-elf/sec64k.exp`, where this diff --git a/open_issues/performance/io_system/clustered_page_faults.mdwn b/open_issues/performance/io_system/clustered_page_faults.mdwn index 3a187523..37433e06 100644 --- a/open_issues/performance/io_system/clustered_page_faults.mdwn +++ b/open_issues/performance/io_system/clustered_page_faults.mdwn @@ -10,6 +10,8 @@ License|/fdl]]."]]"""]] [[!tag open_issue_gnumach open_issue_hurd]] +[[community/gsoc/project_ideas/disk_io_performance]]. + IRC, freenode, #hurd, 2011-02-16 exceptfor the kernel, everything in an address space is diff --git a/open_issues/performance/io_system/read-ahead.mdwn b/open_issues/performance/io_system/read-ahead.mdwn index 3ee30b5d..b6851edd 100644 --- a/open_issues/performance/io_system/read-ahead.mdwn +++ b/open_issues/performance/io_system/read-ahead.mdwn @@ -10,6 +10,8 @@ License|/fdl]]."]]"""]] [[!tag open_issue_gnumach open_issue_hurd]] +[[community/gsoc/project_ideas/disk_io_performance]] + IRC, #hurd, freenode, 2011-02-13: youpi: Would libdiskfs/diskfs.h be in the right place to make -- cgit v1.2.3