Re: OT: Can lot of RAM can slow down a calculation workstation?
On Fri, Jun 26, 2015 at 11:46 AM, <tomas@tuxteam.de> wrote:
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> On Fri, Jun 26, 2015 at 11:33:48AM +0200, Dan wrote:
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>> Yes the calculation is memory/cpu instensive. I can not consider a
>> faster (multi-core) processor because I do not have the budget to buy
>> a new machine. But I need more RAM, the calculation do not fit in 64
>> GB of RAM.
>
> In that case, if the computer has to resort to disk (swap), most probably
> more RAM might help. How is the access pattern? Does the calculation
> need access to "all of its address space" "all of the time"?
Right now the calculation fits in 64 GB, but I want to increase the
size. I could use the swap (SDD), but it gets very hot, maybe I could
buy a fan for the SSD. I do not know if that exists. The calculation
needs "previous results". It does not need all the addess space at the
exact same time. I could use the swap, but I suppose that there is a
limit for the temperature that the SSD can get.
> In that case, there seems you have no choice. OTOH this will be the
> pessimal access pattern wrt memory caches (which will be stretched
> half as thinly with the more RAM), but probably you know all of that.
No I do not know that. I am a scientist, and I use the computers as a
tool to do simulations that I write in C++ with (Threading Building
Blocks). I have a limited knowledge of the computer architecture. That
would mean that a calculation that fits in 64GB will run slower with
256GB? or that means that when I increase the size the calculation
will be slower.
Thanks!
Dan
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