I have the skas patch in the host, and I export the TMPDIR as example below,
but I have the same result: UML is very slow, booting (2 minutes) and after
too.
The host machine is an 4 processor P4 Xeon 2G (multithread) with 4GB ram.
What's happening?
Thanks Thanks
-----Mensaje original-----
De: BlaisorBlade [mailto:blaisorblade_spam@xxxxxxxx]
Enviado el: jueves, 05 de febrero de 2004 19:53
Para: user-mode-linux-user@xxxxxxxxxxxxxxxxxxxxx
CC: Martinez Gonzalez, Francisco
Asunto: Re: [uml-user] UML too slow.
Alle 12:37, giovedì 5 febbraio 2004, Martinez Gonzalez, Francisco ha
scritto:
> Hello,
>
>
> The case is that we are testing a machine with 8 processors and 16GB of
> ram, in which we would like to raise several images UML (6 or 8), and when
> we raised an image without passing the parameter "mem =" it goes very
> speed, but at the moment in which we indicated the parameter "mem=256M" or
> more, the starting of that UML is slowest, reason why we did not raise the
> more when seeing the slowness of this one. According to I have been
> reading, UML doesn't take physical memory of host, if that creates a file
> in filesystem of host with the size indicated in the parameter "mem =".
Yes, this is true. That file is inside /tmp normally (i.e. on your disk) and
is deleted (so only ls /proc/<umlpid>/fd or lsof can show it). But if you
do:
export TMPDIR=/dev/shm
<start UML>
unset TMPDIR
then the file will go onto /dev/shm, which is a RAM-based filesystem (i.e.
the
file, actually, is on RAM). This will make it a lot faster. Also, remember
using the skas patch on the host for speed.
Bye
--
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
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