[arch-general] Can you test machine to set --jobs[=N] from w/i PKGBUILD?

Baho Utot baho-utot at columbus.rr.com
Sun Apr 1 09:03:36 EDT 2012

On 04/01/2012 08:37 AM, Calvin Morrison wrote:
> Often higher cores benefit high I/O applications. If gcc is bottlenecking
> at reading and writing,  sometimes more threads will help.

How does that help?

Sounds backwards to me

> On Apr 1, 2012 7:49 AM, "Vitor Garcia"<vitorlopesgarcia at gmail.com>  wrote:
>> On Sun, 01 Apr 2012 13:37:27 +0200
>> Florian Pritz<bluewind at xinu.at>  wrote:
>>> Simple tests (building readline because it's small) with -j4 and -j8
>>> on my i7-920 show that -j8 is around 20% faster than -j4. IIRC
>>> wikipedia states that HT core can increase performance by up to 30%.
>> This is nice to know. I work with mechanichal engineering simulations
>> and we have noted that using more threads then avaiable processors (we
>> have a  2 x 6 cores processors that has HT, so it looks like a 24 cores
>> server) increases the calculation time on the softwares we have. I
>> assumed that the same would apply to any intensive task, and we have
>> even disabled HT on the BIOS. Perhaps I'll enable it again.

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