* kernel-x64-smp-multiprocessor-time util problem
@ 2006-06-19 23:04 art
2006-06-19 23:17 ` Bernd Petrovitsch
2006-06-21 9:24 ` Andi Kleen
0 siblings, 2 replies; 5+ messages in thread
From: art @ 2006-06-19 23:04 UTC (permalink / raw)
To: linux-kernel
on dual core amd-athlon under 64bit-smp core
kernel compilation time:
time make -j 8
...
LD [M] sound/usb/snd-usb-lib.ko
LD [M] sound/usb/usx2y/snd-usb-usx2y.ko
real 18m0.948s
user 26m6.270s ------bad
sys 4m22.256s ------?bad
[xxx@localhost linux-2.6.17]$
--- real-clock time is ~18 min -- user and system time doubled?
art@usfltd.com
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: kernel-x64-smp-multiprocessor-time util problem
2006-06-19 23:04 kernel-x64-smp-multiprocessor-time util problem art
@ 2006-06-19 23:17 ` Bernd Petrovitsch
2006-06-21 8:17 ` art
2006-06-21 9:24 ` Andi Kleen
1 sibling, 1 reply; 5+ messages in thread
From: Bernd Petrovitsch @ 2006-06-19 23:17 UTC (permalink / raw)
To: art; +Cc: linux-kernel
On Mon, 2006-06-19 at 18:04 -0500, art@usfltd.com wrote:
> on dual core amd-athlon under 64bit-smp core
>
> kernel compilation time:
>
> time make -j 8
> ...
> LD [M] sound/usb/snd-usb-lib.ko
> LD [M] sound/usb/usx2y/snd-usb-usx2y.ko
>
> real 18m0.948s
> user 26m6.270s ------bad
> sys 4m22.256s ------?bad
> [xxx@localhost linux-2.6.17]$
> --- real-clock time is ~18 min -- user and system time doubled?
How many virtual CPUs (i.e. HT is "2 CPUs") do you have in that machine?
Bernd
--
Firmix Software GmbH http://www.firmix.at/
mobil: +43 664 4416156 fax: +43 1 7890849-55
Embedded Linux Development and Services
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: kernel-x64-smp-multiprocessor-time util problem
2006-06-19 23:17 ` Bernd Petrovitsch
@ 2006-06-21 8:17 ` art
2006-06-21 8:33 ` Bernd Petrovitsch
0 siblings, 1 reply; 5+ messages in thread
From: art @ 2006-06-21 8:17 UTC (permalink / raw)
To: Bernd Petrovitsch; +Cc: linux-kernel
Quoting Bernd Petrovitsch <bernd@firmix.at>:
> On Mon, 2006-06-19 at 18:04 -0500, art@usfltd.com wrote:
>> on dual core amd-athlon under 64bit-smp core
>>
>> kernel compilation time:
>>
>> time make -j 8
>> ...
>> LD [M] sound/usb/snd-usb-lib.ko
>> LD [M] sound/usb/usx2y/snd-usb-usx2y.ko
>>
>> real 18m0.948s
>> user 26m6.270s ------bad
>> sys 4m22.256s ------?bad
>> [xxx@localhost linux-2.6.17]$
>> --- real-clock time is ~18 min -- user and system time doubled?
>
> How many virtual CPUs (i.e. HT is "2 CPUs") do you have in that machine?
>
> Bernd
> --
> Firmix Software GmbH http://www.firmix.at/
> mobil: +43 664 4416156 fax: +43 1 7890849-55
> Embedded Linux Development and Services
>
------------------------------------------------
1 CPU 2 cores = 2 (amd athlon x2 4200+)
xboom
art@usfltd.con
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: kernel-x64-smp-multiprocessor-time util problem
2006-06-21 8:17 ` art
@ 2006-06-21 8:33 ` Bernd Petrovitsch
0 siblings, 0 replies; 5+ messages in thread
From: Bernd Petrovitsch @ 2006-06-21 8:33 UTC (permalink / raw)
To: art; +Cc: linux-kernel
On Wed, 2006-06-21 at 03:17 -0500, art@usfltd.com wrote:
> Quoting Bernd Petrovitsch <bernd@firmix.at>:
> > On Mon, 2006-06-19 at 18:04 -0500, art@usfltd.com wrote:
> >> on dual core amd-athlon under 64bit-smp core
> >>
> >> kernel compilation time:
> >>
> >> time make -j 8
> >> ...
> >> LD [M] sound/usb/snd-usb-lib.ko
> >> LD [M] sound/usb/usx2y/snd-usb-usx2y.ko
> >>
> >> real 18m0.948s
> >> user 26m6.270s ------bad
> >> sys 4m22.256s ------?bad
> >> [xxx@localhost linux-2.6.17]$
> >> --- real-clock time is ~18 min -- user and system time doubled?
> >
> > How many virtual CPUs (i.e. HT is "2 CPUs") do you have in that machine?
[...]
> 1 CPU 2 cores = 2 (amd athlon x2 4200+)
What does "real" really measure?
What does "user" and "sys" really measure?
Bernd
--
Firmix Software GmbH http://www.firmix.at/
mobil: +43 664 4416156 fax: +43 1 7890849-55
Embedded Linux Development and Services
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: kernel-x64-smp-multiprocessor-time util problem
2006-06-19 23:04 kernel-x64-smp-multiprocessor-time util problem art
2006-06-19 23:17 ` Bernd Petrovitsch
@ 2006-06-21 9:24 ` Andi Kleen
1 sibling, 0 replies; 5+ messages in thread
From: Andi Kleen @ 2006-06-21 9:24 UTC (permalink / raw)
To: art; +Cc: linux-kernel
art@usfltd.com writes:
> on dual core amd-athlon under 64bit-smp core
>
> kernel compilation time:
>
> time make -j 8
> ...
> LD [M] sound/usb/snd-usb-lib.ko
> LD [M] sound/usb/usx2y/snd-usb-usx2y.ko
>
> real 18m0.948s
> user 26m6.270s ------bad
> sys 4m22.256s ------?bad
> [xxx@localhost linux-2.6.17]$
> --- real-clock time is ~18 min -- user and system time doubled?
user/sys accounts how much time the individual CPUs spent on your
job. real counts how far your wall clock advanced.
Think about it. It's not that difficult to understand.
-Andi
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2006-06-21 9:24 UTC | newest]
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2006-06-19 23:04 kernel-x64-smp-multiprocessor-time util problem art
2006-06-19 23:17 ` Bernd Petrovitsch
2006-06-21 8:17 ` art
2006-06-21 8:33 ` Bernd Petrovitsch
2006-06-21 9:24 ` Andi Kleen
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