--- Steve Loughran <stevel@(protected):

> Michael Meyer wrote:
>
>
> > On mere build servers running linux one could
> disable
> > the second core at boot time permanently to reduce
> the
> > build time, if no other processes are running on
> this
> > server.
> >
> > But on workstations the second core is often used
> by
> > the application being developed if it is
> > multithreaded, so there might be no way in linux
> to
> > reduce the build time wih two cores?
>
>
> we dont want to turn core #2, off, or even cores #3
> and #4. Not when my
> memory/process footprint has 3 vmware images
> (windows for exchange,
> centos for release builds, rhel4 for testing and
> then the IDE on my main
> machine)
>
>
>   PID USER    PR NI VIRT RES SHR S %CPU %MEM
>  TIME+ COMMAND
>
>  9184 slo     18  0 2443m 802m 15m S   0 13.4
> 84:51.39 java
>
>  9129 slo     5 -10 770m 579m 561m S   0 9.7
> 38:32.89 vmware-vmx
>
>  8403 slo     5 -10 768m 570m 556m S  16 9.5
> 850:09.04 vmware-vmx
>
>  8361 slo     15  0 891m 368m 29m S   2 6.2
> 63:29.62
> firefox-bin
>  9144 slo     5 -10 501m 304m 290m S   0 5.1
> 6:12.59 vmware-vmx
>
>  8253 slo     15  0 373m 251m 22m S   0 4.2
> 12:02.73
> thunderbird-bin
> 29911 slo     18  0 1641m 177m 12m S   0 3.0
> 7:42.59 java
>
>  5708 root    15  0 314m 167m 59m S   0 2.8
> 30:08.87 Xorg
>
> 24284 slo     17  0 1560m 141m 8692 S   0 2.4
> 0:35.69 java
>
> 19907 slo     15  0 645m 92m 61m S   0 1.6
> 0:04.22 soffice.bin
>
> 11023 slo     15  0 609m 69m 36m S   0 1.2
> 22:51.60 amarokapp
>
>  8304 slo     15  0 384m 54m 28m S   0 0.9
> 1:47.77 vmware
>
> I had a look at the code and there's no obvious
> synchronisation in the
> javac code. If there is a delay, it may be in the
> output/listener logic,
> which could well be synchronized. On a multicpu
> system the cost of
> acquiring a lock may be higher.
>
> I'd love to track this down, but nothing obvious
> springs to mind.
>
> -could you try building under vmware/xen? We do that
> for releases to
> ensure the release builds are with clean source, no
> matter what I'm editing.
>
> -steve

I did not completely understand what you did mean with
a vmware/xen build. Shall I install different OSs or
shall I install Ubuntu Linux on top of ubuntu Linux in
order to make sure that I did not change the default
install significantly?

Unfortunately, I have neither VMware nor any Windows
version. Additionally, I am not able to install Centos
5.1 (RHEL 5.1), as the RHEL kernel has no driver for
my IDE Controller, which is why there is no DMA
available and anything is dog slow.

So obviously, I should be able to install Ubuntu on
top of Ubuntu and I could try to install Solaris 10 or
SXDE on Ubuntu.


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