ModelSIM vcom speed

[Armin Krieg]

Hi!

This is only indirectly related to the LEON-processor, but possibly
someone experienced something similar...

When doing "make vsim" in an VirtualBox-VM running grml-Linux (1GB
RAM), this process is finished extremely fast.
Now we got a new 6-core Phenom2 machine with 8GB RAM running openSUSE
and this process takes significantly longer
there.
Especially when compiling "leaves.vhd" there is a noticable difference
in time needed to compile it.

Therefore it seems the 6-core machine isn't working as fast as it could
or is this a known advantage of VMs...perhaps
hardisc access is much faster or something like that?!?

wkr,

Armin Krieg


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[Jiri Gaisler]

vcom/vlog on larger files (like leaves.vhd) is primarily
disk bound. A RAM disk or caching file system will perform
much better that writing directly to disk. Beyond that,
you should take this discussion to the linux kernel
mailing list as it has nothing to do with leon ...

Jiri.

Post by Armin Krieg
Hi!
This is only indirectly related to the LEON-processor, but possibly
someone experienced something similar...
When doing "make vsim" in an VirtualBox-VM running grml-Linux (1GB
RAM), this process is finished extremely fast.
Now we got a new 6-core Phenom2 machine with 8GB RAM running openSUSE
and this process takes significantly longer
there.
Especially when compiling "leaves.vhd" there is a noticable difference
in time needed to compile it.
Therefore it seems the 6-core machine isn't working as fast as it could
or is this a known advantage of VMs...perhaps
hardisc access is much faster or something like that?!?
wkr,
Armin Krieg
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