On Mon, Mar 01, 2010 at 11:29:49AM -0500, Jonathan Dursi wrote:
>
> Hi;
>
> We're a fairly typical academic HPC centre, and we're starting to
> have users talk to us about using our new clusters for projects that
> have various requirements for keeping data confidential.
"Various requirements"
On Mon, Mar 15, 2010 at 05:03:14PM -0700, Tom Elken wrote:
> QLogic MPI does not have a message coalescing feature, and that is
> what we use to measure MPI message rate on our IB adapters.
Thank you for making that clear, Tom.
-- greg
___
Beowulf ma
I don???t appreciate those kind of responses and it is not
appropriate for this mailing list. Please fix in future emails. I am
your assert some numbers, perhaps correct, but Patrick provides
useful explanations. I prefer the latter.
system can provide 3300MB/s uni or >6500MB bi dir. Of cou
On Mon, Mar 15, 2010 at 07:30:15PM -0400, Patrick Geoffray wrote:
> However, things are different for tiny packets. The minimum packet size
> on Ethernet is 60 Bytes. The maximum packet rate (not coalesced !) is
> 14.88 Mpps on a 10GE link, counting everything (inter-packet gap, CRC,
> etc).
> On Behalf Of Gilad Shainer
>
> ... OSU has different benchmarks
> so you can measure message coalescing or real message rate.
[ As a refresher for the wider audience , as Gilad defined earlier: " Message
coalescing is when you incorporate multiple MPI messages in a single network
packet." A
That's correct
- Original Message -
From: beowulf-boun...@beowulf.org
To: Patrick Geoffray
Cc: beowulf@beowulf.org
Sent: Mon Mar 15 16:45:44 2010
Subject: Re: [Beowulf] Q: IB message rate & large core counts (per node)?
If I understand correctly, 40GbE is 64/66 encoded.
Tom
On 3/15
If I understand correctly, 40GbE is 64/66 encoded.
Tom
On 3/15/2010 5:30 PM, Patrick Geoffray wrote:
On 3/15/2010 5:24 PM, richard.wa...@comcast.net wrote:
to best and worst case). It would be good to add Ethernet to the mix
(1Gb, 10Gb, and 40Gb) as well.
10 Gb Ethernet uses 8b/10b
On 3/15/2010 5:24 PM, richard.wa...@comcast.net wrote:
to best and worst case). It would be good to add Ethernet to the mix
(1Gb, 10Gb, and 40Gb) as well.
10 Gb Ethernet uses 8b/10b with a signal rate of 12.5 Gb/s, for a raw
bandwidth of 10 Gb/s. I don't know how 1Gb is encoded and 40 Gb/s is
I don’t appreciate those kind of responses and it is not appropriate for this
mailing list. Please fix in future emails. I am standing behind any info I put
out, and definitely don’t do down estimations as you do. It was nice to see
that you fixed your 20+20 numbers to 24+23 (that was marketing
On 3/15/2010 5:33 PM, Gilad Shainer wrote:
To make it more accurate, most PCIe chipsets supports 256B reads, and
the data bandwidth is 26Gb/s, which makes it 26+26, not 20+20.
I know Marketers lives in their own universe, but here are a few nuts
for you to crack:
* If most PCIe chipsets woul
Date: Fri, 12 Mar 2010 23:38:56 +0530
From: akshar bhosale
Subject: [Beowulf] error while using mpirun
To: beowulf@beowulf.org, torqueus...@supercluster.org
when i do
/usr/local/mpich-1.2.6/bin/mpicc -o test test.c ,i get test ;but when i do
/usr/local/mpich-1.2.6/bin/mpirun -np 4 test,i get
p
hi,
thanks for your solutions.
i tried all solutions given by you ..still same error. can ypu please
suggest any other solution?
regards,
akshar
On Sat, Mar 13, 2010 at 9:41 AM, wrote:
>
> Akshar bhosale wrote:
>
> >When i do:
> >
> >/usr/local/mpich-1.2.6/bin/mpicc -o test test.c ,i get test ;b
On Mar 12, 2010, at 12:08 PM, akshar bhosale wrote:
when i do
/usr/local/mpich-1.2.6/bin/mpicc -o test test.c ,i get test ;but
when i do
/usr/local/mpich-1.2.6/bin/mpirun -np 4 test,i get
p0_31341: p4_error: Path to program is invalid while starting
/home/npsf/last with rsh on dragon: -1
To make it more accurate, most PCIe chipsets supports 256B reads, and the data
bandwidth is 26Gb/s, which makes it 26+26, not 20+20.
Gilad
From: beowulf-boun...@beowulf.org [mailto:beowulf-boun...@beowulf.org] On
Behalf Of richard.wa...@comcast.net
Sent: Monday, March 15, 2010 2:25 PM
On Monday, March 15, 2010 1:27:23 PM GMT Patrick Geoffray wrote:
>I meant to respond to this, but got busy. You don't consider the protocol
>efficiency, and this is a major issue on PCIe.
Yes, I forgot that there is more to the protocol than the 8B/10B encoding,
but I am glad to get your
surprisingly enough there are still cards that don't come with PXE
built into the embedded rom. you'll have to check the specs on the
card you're interested in from the mfg website.
one thing that bit me in the past, even though the card had pxe, the
bios of the machine i was working on had no me
Sorry if this is a silly question, but do any of the inexpensive
1000baseT NICs support PXE boot? I just finished looking through the
offerings on newegg and while a couple of the really really cheap ones
had an empty socket for a boot rom, none of the ones without such a
socket said definitively
Hi Richard,
I meant to reply earlier but got busy.
On 2/27/2010 11:17 PM, richard.wa...@comcast.net wrote:
If anyone finds errors in it please let me know so that I can fix
them.
You don't consider the protocol efficiency, and this is a major issue on
PCIe.
First of all, I would change the
I have placed a copy of Richard's table on ClusterMonkey
in case you want an html view.
http://www.clustermonkey.net//content/view/275/33/
--
Doug
>
> All,
>
>
> In case anyone else has trouble keeping the numbers
> straight between IB (SDR, DDR, QDR, EDR) and PCI-Express,
> (1.0, 2.0, 30) he
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