[General] Any linux gurus?

Sun Dec 15 19:22:33 CST 2013

Can we make them heavier?

Possibly Sulfur Hexafluoride?

On Sun, Dec 15, 2013 at 3:20 PM, Barbara Attilio
<barbara.attili at gmail.com> wrote:
> 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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