Rob van der Heij wrote:
On 5/18/06, Peggy Andrews <[EMAIL PROTECTED]> wrote:
I didn't miss the posts, but I'm not sure what to do with that
information to "prove" that we can run at the same performance level.
It is very hard to demonstrate the suitability of the platform with a
few synthetic test cases. The measured performance level may not be
essential for the application.
So essentially, are you saying that we can't get the same performance
on a directory to directory copy without investing in 2 IFL engines?
If your business application were to copy a file from one virtual
machine to the other using FTP, then an extra IFL would help you do
that quicker. Question is whether you need it quicker, whether you
could maybe share the file via NFS rather than copy it, etc.
If you _do_ want to copy such files regularly, ftp might not be the best
way to copy it anyway.
Bear in mind that copying CD-sized files is a test of copying CD-sized
files. It might mean something for other-sized files, but then it might not.
With some file sized, caching can affect results:
[EMAIL PROTECTED] ~]$ time cp downloads/wrt54g.3.03.9.tgz /dev/null
real 0m3.296s
user 0m0.011s
sys 0m0.523s
[EMAIL PROTECTED] ~]$ time cp downloads/wrt54g.3.03.9.tgz /dev/null
real 0m1.020s
user 0m0.014s
sys 0m0.456s
[EMAIL PROTECTED] ~]$
That file is 179M; larger files I tested (in conjunction with other
stuff running) swamp my cache.
As you're running under VM, it may be VM caching plays a part too. And
maybe the DASD cache.
Your performance will also be affected by what the underlying hardware
is doing: do you have contention for network and DASD components?
--
Cheers
John
-- spambait
[EMAIL PROTECTED] [EMAIL PROTECTED]
Tourist pics http://portgeographe.environmentaldisasters.cds.merseine.nu/
do not reply off-list
----------------------------------------------------------------------
For LINUX-390 subscribe / signoff / archive access instructions,
send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390
