[General] Any linux gurus?

Sun Dec 15 19:20:00 CST 2013

What , you think I'm made of money? Also, rainbow balloons. Maybe 3. One
half deflated out of spite.
On Dec 15, 2013 7:16 PM, "Erik Arendall" <earendall at gmail.com> wrote:

> 99 luftballoons?
> On Dec 15, 2013 6:55 PM, "Barbara Attilio" <barbara.attili at gmail.com>
> wrote:
>
>> I can bring balloons!
>> On Dec 15, 2013 6:53 PM, "enabrintain at yahoo.com" <enabrintain at yahoo.com>
>> wrote:
>>
>>> I want a cookie cake!
>>>
>>> *Sent from my Verizon Wireless 4G LTE DROID*
>>>
>>>
>>> Justin Richards <ratmandu at gmail.com> wrote:
>>>
>>> Woohoo!
>>> On Dec 15, 2013 6:48 PM, "Kyle Centers" <kylecenters at gmail.com> wrote:
>>>
>>>> Jeff Cotten says if this thread gets to 50 messages, he'll throw a
>>>> party. So. This is my contribution?
>>>> On Dec 15, 2013 5:37 PM, "James Fluhler" <j.fluhler at gmail.com> wrote:
>>>>
>>>>> Thanks for the link I will check it out!
>>>>>
>>>>> James F.
>>>>>
>>>>> On Dec 15, 2013, at 4:04 PM, Stephan Henning <shenning at gmail.com>
>>>>> wrote:
>>>>>
>>>>> -WD
>>>>>
>>>>> I'll check the arrays and see what they are currently formatted as,
>>>>> it's not a big deal to reformat one of these arrays, so that something that
>>>>> can be changed quick and easy.
>>>>>
>>>>> Eh, I'm not involved in the development, but I'll bring it up and if
>>>>> it is something that hasn't been considered I'll put some pressure on them
>>>>> to look into it.
>>>>>
>>>>>
>>>>> -James
>>>>> http://www.ierustech.com/product/v-lox/
>>>>>
>>>>> It's internally built, just got rolled out to market.
>>>>>
>>>>>
>>>>>
>>>>> On Sun, Dec 15, 2013 at 2:04 PM, James Fluhler <j.fluhler at gmail.com>wrote:
>>>>>
>>>>>> I have not heard of VLOX before and a quick google search turned up
>>>>>> nothing? Is it commercially available or internally built? I've typically
>>>>>> used NEC, GEMS, EMDS, and Genesys, for eMag simulation work.
>>>>>>
>>>>>> Just curious but where do you work haha
>>>>>>
>>>>>> James F.
>>>>>>
>>>>>> On Dec 13, 2013, at 11:13 AM, Stephan Henning <shenning at gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>> Method of Moment, Computational ElectroMagnertics.
>>>>>>
>>>>>> Program is called Vlox
>>>>>>
>>>>>>
>>>>>> On Fri, Dec 13, 2013 at 10:47 AM, David <ainut at knology.net> wrote:
>>>>>>
>>>>>>>  MoM CEM vlox -- could you expand those acronyms, please?  Is this a
>>>>>>> logistics planning tool?
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Stephan Henning wrote:
>>>>>>>
>>>>>>> -David
>>>>>>>
>>>>>>>  Hmm, sounds interesting. The problem is distributed a little
>>>>>>> currently, you can think of it kind of what is being done as a form of
>>>>>>> monte carlo, so the same run will get repeated many times with light
>>>>>>> parameter adjustments. Each of these can be distributed out to the compute
>>>>>>> nodes very easily, currently this is being done with condor.
>>>>>>>
>>>>>>>
>>>>>>>  -James
>>>>>>>
>>>>>>>  It's a MoM CEM tool called vlox.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On Fri, Dec 13, 2013 at 5:43 AM, James Fluhler <j.fluhler at gmail.com>wrote:
>>>>>>>
>>>>>>>>  I'm just curious what simulation program are you running? I've
>>>>>>>> used a number in the past that also utilize the GPU's for processing.
>>>>>>>>
>>>>>>>> James F.
>>>>>>>>
>>>>>>>> On Dec 12, 2013, at 11:28 PM, David <ainut at knology.net> wrote:
>>>>>>>>
>>>>>>>>   IIRC, the good thing about this cluster is the automagic load
>>>>>>>> leveling.  Your existing binary may not run at max optimization but if the
>>>>>>>> task can be spread among processors, Beowulf does a nice job of it.  If
>>>>>>>> each computer has it's own GPU(s), then all the better.
>>>>>>>>
>>>>>>>> You can test it right there without changing anything on the
>>>>>>>> system's disks.  Just create and run all the cluster members off a CD.
>>>>>>>>
>>>>>>>> Then to test, pick the fastest one of them (maybe even your
>>>>>>>> existing Xeon box), run your benchmark, record execution time, then boot
>>>>>>>> all the other machines in the cluster and run it again.  There are only
>>>>>>>> about two dozen steps to set it up.  One professor even put most of those,
>>>>>>>> along with automatic cluster setup(!) as a downloadable you can boot off
>>>>>>>> of.  That leaves half a dozen steps to tweak the cluster together, then
>>>>>>>> you're good to go.  I have one of those CD's around here somewhere and I
>>>>>>>> can get details if you're interested.  Something to play with.  I did it
>>>>>>>> with only 4 pc's around the house with some code and even though the code
>>>>>>>> was never designed for a cluster (just multiprocessing), I got about 40%
>>>>>>>> decrease in execution time.  The code was almost completely linear
>>>>>>>> execution so I'm surprised it got any improvement but it did.
>>>>>>>>
>>>>>>>> David
>>>>>>>>
>>>>>>>>
>>>>>>>> Stephan Henning wrote:
>>>>>>>>
>>>>>>>> -WD
>>>>>>>>
>>>>>>>>  I believe it's either ext3 or ext4, I'd have to ssh in and check
>>>>>>>> when I get back on Monday.
>>>>>>>>
>>>>>>>>  -David
>>>>>>>>
>>>>>>>>  I'll check into the Beowulf and see what that would entail. I'll
>>>>>>>> try and talk with the developer and see what their thoughts are on the
>>>>>>>> feasibility of running it on a cluster. They may have already gone down
>>>>>>>> this path and rejected it, but I'll check anyway.
>>>>>>>>
>>>>>>>>
>>>>>>>> On Thu, Dec 12, 2013 at 6:16 PM, David <ainut at knology.net> wrote:
>>>>>>>>
>>>>>>>>> Sounds like a perfect candidate for a Beowulf cluster to me.
>>>>>>>>>  There are possibly some gotcha's but you'll have the same problems with
>>>>>>>>> just a single computer.
>>>>>>>>>
>>>>>>>>> Velly intewesting.
>>>>>>>>>
>>>>>>>>> Stephan Henning wrote:
>>>>>>>>>
>>>>>>>>>>  -WD
>>>>>>>>>>
>>>>>>>>>> The GPUs are sent data in chunks that they then process and
>>>>>>>>>> return. The time it takes a GPU to process a chunk can vary, so I assume
>>>>>>>>>> the bottle necks we were seeing was when several of the GPU cores would
>>>>>>>>>> finish at about the same time and request a new chunk and the chunk they
>>>>>>>>>> needed wasn't already in RAM, so the drive array would take a heavy hit.
>>>>>>>>>>
>>>>>>>>>> Beyond that, I can't really give you a numerical value as to the
>>>>>>>>>> amount of data they are dumping into the pcie bus.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> -David
>>>>>>>>>>
>>>>>>>>>> Ya, not sure an FPGA exists large enough for this, it would be
>>>>>>>>>> interesting though.
>>>>>>>>>>
>>>>>>>>>> While the process isn't entirely sequential, data previously
>>>>>>>>>> processed is reused in the processing of other data, so that has kept us
>>>>>>>>>> away from trying a cluster approach.
>>>>>>>>>>
>>>>>>>>>> Depending on the problem, anywhere from minutes per iteration, to
>>>>>>>>>> weeks per iteration. The weeks long problems are sitting at about 3TB I
>>>>>>>>>> believe. We've only run benchmark problems on the SSDs up till now, so we
>>>>>>>>>> haven't had the experience of seeing how they react once they start really
>>>>>>>>>> getting full.
>>>>>>>>>>
>>>>>>>>>>  Sadly, 2TB of RAM would not be enough. I looked into this Dell
>>>>>>>>>> box (
>>>>>>>>>> http://www8.hp.com/us/en/products/proliant-servers/product-detail.html?oid=4231377#!tab=features<
>>>>>>>>>> http://www8.hp.com/us/en/products/proliant-servers/product-detail.html?oid=4231377#%21tab=features>)
>>>>>>>>>> that would take 4TB, but the costs were insane and it can't support enough
>>>>>>>>>> GPUs to actually do anything with the RAM...
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>  <<<snip>>>
>>>>>>>>>
>>>>>>>>>
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