Re: [Beowulf] [upgrade strategy] Intel CPU design bug & security flaw - kernel fix imposes performance penalty

2018-01-08 Thread Xingqiu Yuan
Intel recently claimed that their bug fix gives little affect on the chip's performances last week. On Mon, Jan 8, 2018 at 10:19 AM, Prentice Bisbal wrote: > On 01/05/2018 07:35 PM, Gerald Henriksen wrote: > > On Fri, 5 Jan 2018 17:32:19 -0500, you wrote: >> >> According to several articles I re

Re: [Beowulf] China aims for 100 PF

2015-07-17 Thread Xingqiu Yuan
well, this is always not bad for the world to have one more choice. I would like to be more optimum in the future HPC market with cheaper product ... On Fri, Jul 17, 2015 at 1:57 PM, Fabricio Cannini wrote: > On 17-07-2015 09:44, Scott Atchley wrote: > >> They will use a homegrown GPDSP (general

[Beowulf] mpi_comm_create scaling issue

2013-09-05 Thread xingqiu yuan
Hi ALL MPI_COMM_CREATE takes a substantial amount of time on large communicators, any good ideas to reduce the time consuming on large communicators? regards Xingqiu Yuan ___ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To

Re: [Beowulf] More AMD rumors

2012-11-19 Thread xingqiu yuan
About ten years ago, when we choose CPUs for supercomputer in our supercomputer center. AMD cpus have much better performance than Intel cpus. It is a great pity to hear this news, although I hope this will NOT be true...It is good to have choice instead of only one On Mon, Nov 19, 2012 at

Re: [Beowulf] Advice on 4 CPU node configurations

2011-02-09 Thread xingqiu yuan
On Wed, Feb 9, 2011 at 2:37 PM, Prentice Bisbal wrote: > Craig Tierney wrote: > > On 2/9/11 7:38 AM, Prentice Bisbal wrote: > >> I don't think Numascale/ScaleMP has much of a cost advantage anymore. > >> > >> About 6 months ago, I purchased a couple of Dell PowerEdge R815s with > >> 128 GB of RAM

[Beowulf] wall clock time for mpi_allreduce?

2010-09-12 Thread xingqiu yuan
Hi I found that use of mpi_allreduce to calculate the global maximum and minimum takes very long time, any better alternatives to calculate the global maximum/minimum values? ___ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To

Re: [Beowulf] 32 nodes cluster price

2007-10-05 Thread xingqiu yuan
In deed, we understand that our question is too general, and it is really very hard to what the price is. But we really don't have any good idea about which type of cluster structure is suitable for us. We work on computational plasma physics, basically doing some magnetohydrodynamic (MHD) and part

[Beowulf] 32 nodes cluster price

2007-10-03 Thread xingqiu yuan
Dear All We are going to buy a small size beowulf cluster with 32 multicore processors (INTEL or AMD multicore processor). We don't care the network, but we need a big storage disks. Anybody can give us some suggestions about the hardware and the price? best regards Xingqiu