[THIN] Re: RAMDISK
- From: "Braebaum, Neil" <Neil.Braebaum@xxxxxxxxxxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Mon, 16 Feb 2004 14:18:07 -0000
A year or two back, I did some performance work with solid-state SCSI
devices (ie hard drives emulated as SCSI drive, but using RAM DIMMs).
However, the machine I was testing on, wasn't short of memory. So paging
was of the pre-emptive, always-going-to-happen variety. And try as I
might, with the limited time and resources I had at hand at the time, I
couldn't simulate sufficient load / user counts (using CSTK) to really
make the machine struggle.
So I didn't see anything in the way of performance boost. And being
pragmatic, given that there's a certain degree of paging activity that's
always going to be present, I could only theorise that if I could get
the product to make a difference, I'd perhaps trade waiting I/O times,
for context switches and up the CPU load instead.
I struggle to see a great area for impact for them - unless you need a
total Rolls Royce, no expense spared implementation, with maximum
performance, money no object. Otherwise, I would have thought it more
cost-effective to simply add RAM, or more servers.
Neil
> -----Original Message-----
> From: Bernd Harzog [mailto:Bernd.Harzog@xxxxxxxxxxx]
> Sent: 16 February 2004 13:28
> To: thin@xxxxxxxxxxxxx
> Subject: [THIN] Re: RAMDISK
>
> Good product, good people. What is does is allow you to
> replace part of = your mechanical rotating magnetic disk
> storage with a solid state disk = storage. So, you can put
> things like your page file (or part of it) on a = drive that
> is much faster than an ordinary disk drive, and almost as =
> fast as memory. Since you are not reducing the amount of RAM
> available = to applications when you do this, this is not a
> case of robbing Peter to = pay Paul. It is however, quite a
> bit more expensive, than for example = our product TScale,
> which works by reducing the number of things that = have to
> be kept in the page file.
>
> Cheers,=20
>
> Bernd Harzog
> CEO
> RTO Software, Inc.
> bernd.harzog@xxxxxxxxxxx
> 678-455-5506 x701
> www.rtosoft.com
>
> -----Original Message-----
> From: Steve Snyder [mailto:steven_snyder@xxxxxxxxx]=20
> Sent: Sunday, February 15, 2004 11:21 PM
> To: thin@xxxxxxxxxxxxx
> Subject: [THIN] Re: RAMDISK
>
> Or for those of you who recall Digital's non-voltile
> ramdrives for VAXs, here's the modern equivalent (they
> claim to increase a citrix box's scalabilty, so I'm
> interested to read what Bernd thinks about it)
>
> http://www.tigicorp.com/tigijet.htm
>
> fwiw - I used to use ramdrives in the old days to
> increase compiling performance until disk-caching
> pretty much gave me the same advantage, which is why I
> think its largely unused these days
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