From: eLinux.org
Parallel RC Scripts
Contents
- 1 Description
- 2 How to implement or use
- 3 Expected Improvement
- 4 Resources
- 5 Specifications
- 6 Patches
- 7 Case Studies
Description
One way to reduce bootup time is to run RC scripts in parallel. RC scripts are normally run in sequence in a desktop configuration of Linux. By running the scripts in parallel, it is possible to take advantage of the multi-processing capabilities of the OS (such as overlapping execution with I/O, etc.)
How to implement or use
See the projects listed below for details on different methods of doing this.
Expected Improvement
[Not determined yet.]
Resources
Projects
- InitNG: a new replacement for SysV init. Boots your system much faster by running as much as possible asynchronously. See InitNG
- IBM article on on using Makefile techniques to express dependencies between services and support parallel service start. See BootFaster
- Richard Gooch project to rewrite boot script system from scratch. Eliminates lots of BSD and SYS V-isms, and introduces dependencies. See boot scripts
- Serel project - for parallelizing service startup. Commands are inserted into RC scripts to cause needed services to start (based on XML database of dependencies). See fastboot
Specifications
- LSB specification for comments in RC Scripts which allow parallization. See 1(http://www.linuxbase.org/spec/refspecs/LSB_1.1.0/gLSB/initscrcomconv.html)
Patches
None.
Case Studies
[None yet.]
Case 1
[put information about an actual use of this technique here. A case study should include:]
Hardware:: [hardware description here] Kernel Version:: [kernel version here] Configuration:: [information about the configuration used here] Time without change:: [put that here] Time with change:: [put that here]
[Add any additional notes as you see fit.]
