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From: D from BC on 17 Jan 2010 16:09
I'm tried out a trial version of 'Ramdisk' and set aside 4G of memory
(I have 8G) to be used as a ramdrive for the raw file created during
an LTSPICE simulation..

Conclusion
Yup. It's faster.
Helps with long smps simulation.

From: Jim Thompson on 17 Jan 2010 16:18
On Sun, 17 Jan 2010 13:09:28 -0800, D from BC
<myrealaddress(a)comic.com> wrote:

>I'm tried out a trial version of 'Ramdisk' and set aside 4G of memory
>(I have 8G) to be used as a ramdrive for the raw file created during
>an LTSPICE simulation..
>
>Conclusion
>Yup. It's faster.
>Helps with long smps simulation.

Please cite how much "faster".

Total simulation time for each, with and without the Ramdisk?

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
From: Martin Brown on 17 Jan 2010 16:34
D from BC wrote:
> I'm tried out a trial version of 'Ramdisk' and set aside 4G of memory
> (I have 8G) to be used as a ramdrive for the raw file created during
> an LTSPICE simulation..
>
> Conclusion
> Yup. It's faster.
> Helps with long smps simulation.

By what percentage improvement on a given problem?
How does it compare with using SSD with/without RAID?

Regards,
Martin Brown
From: D from BC on 18 Jan 2010 22:23
On Sun, 17 Jan 2010 14:18:25 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com/Snicker> wrote:

>On Sun, 17 Jan 2010 13:09:28 -0800, D from BC
><myrealaddress(a)comic.com> wrote:
>
>>I'm tried out a trial version of 'Ramdisk' and set aside 4G of memory
>>(I have 8G) to be used as a ramdrive for the raw file created during
>>an LTSPICE simulation..
>>
>>Conclusion
>>Yup. It's faster.
>>Helps with long smps simulation.
>
>Please cite how much "faster".
>
>Total simulation time for each, with and without the Ramdisk?
>
> ...Jim Thompson

Darn.. I was hoping to dodge the burden of proof which takes time.
It's my observation that ltspice seems faster when the raw file is on
a ramdrive.

Theoretically there should be an improvement in ltspice simulation if
there is a large .raw file say ~2GB and one needs to see many test
points in an smps.
Generally ram transactions are faster than SSD or harddisk.

Maybe try out the trial.
http://www.superspeed.com/desktop/ramdisk.php

From: D from BC on 18 Jan 2010 22:38
On Sun, 17 Jan 2010 21:34:44 +0000, Martin Brown
<|||newspam|||@nezumi.demon.co.uk> wrote:

>D from BC wrote:
> > I'm tried out a trial version of 'Ramdisk' and set aside 4G of memory
> > (I have 8G) to be used as a ramdrive for the raw file created during
> > an LTSPICE simulation..
> >
> > Conclusion
> > Yup. It's faster.
> > Helps with long smps simulation.
>
>By what percentage improvement on a given problem?
>How does it compare with using SSD with/without RAID?
>
>Regards,
>Martin Brown

It seems like a 30% to 50% speed improvement in drawing graphs when
picking different test points in an smps.
But....it still could be bogus like noticing a driving improvement
after filling up with top octane gas.

Unfortunately, I can't back up my claim without creating a research
project within my research project.

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