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Does anybody know the score on concurrent booting in Lucid Lynx?

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struggle4progress Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Sep-22-10 12:05 AM
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Does anybody know the score on concurrent booting in Lucid Lynx?
Here's a pre-Lucid tip:

Concurrent Booting, make full use of your multi-core processors during boot time
http://n00bsonubuntu.com/software/concboot

Concurrent Booting: make full use of your dual-core, multithreaded or hyperthreaded processors in Ubuntu
http://gizvillage.blogspot.com/2009/04/concurrent-booti...

But the changes in 10.04 may make it obsolete:

Despus de instalar Ubuntu 10.04 Lucid Lynx
http://lavidalinux.com.ar/2010/05/despues-de-instalar-u...

Acelera el arranque de Ubuntu en mquinas con varios nucleos
http://portalubuntu.blogspot.com/2010/05/acelera-el-arr...

I can't find much on the web about this recommended change from "CONCURRENCY=none" to "CONCURRENCY=startpar." The file /etc/init.d/rc is a script containing a number of instances "CONCURRENCY=none," and I'm not sure I want to rewrite it with sed unless I have some idea what I'm doing




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struggle4progress Donating Member (1000+ posts) Send PM | Profile | Ignore Sat Sep-25-10 01:19 AM
Response to Original message
1. Report: Well, I finally tried it on a quadcore AMD
Saved copies of /etc/init.d/rc and /etc/default/rcS as /etc/init.d/rc.old and /etc/default/rcS.old with cp -a so I could recover if necessary, then ran

sudo sed -i 's/CONCURRENCY=none/CONCURRENCY=startpar/g' /etc/init.d/rc && sudo sh -c "echo 'CONCURRENCY=startpar' >> /etc/default/rcS"

No obvious problem on either restart or restart after complete shutdown. I don't think it's done any harm. It's hard to tell if it's done much good: this rig already has system and app files on an ssd and the rest of the stuff is on a raid 0, so it booted pretty fast anyway. But it's also got an nVidia card, so a known problem with plymouth slows the boot
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struggle4progress Donating Member (1000+ posts) Send PM | Profile | Ignore Sat Oct-02-10 07:49 AM
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2. Tried it on a dual socket machine. Again, if there's any improvement, it's slight.
Majority of boot time is mobo-related, and this can't help that
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