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Hi,
I agree with Tomasz that the inbuilt cache memory is faster than a RAM Disk, but there is the size limit problem. 64 bit AB resolves this issue, but unfortunately the IQFeed plugin I use does not work with this setup, so for me a RAM Disk and 32bit AB was the only choice.
I've been using this setup for several months now and I won't go back until IQFeed Plugin will work with 64bit systems.
My settings for "In Memory Cache Size" is 11 and max. Megabytes is 850.
I run a 7GB+ DB on a 16GB RAM machine for which 10GB is a RAM Disk.
When I ran the original tests I had experienced 4-6X speed improvement.
I might have got this improvement because I might have a slow harddisk to start with. Crystalmark shows something like 1900MB/s on the RAM Disk vs 86GB/s sequential read on my HDD.
Regards,
eToke
--- In amibroker@xxxxxxxxxxxxxxx, "smw311" <steve@xxx> wrote:
>
>
> Thanks for the quick reply Tomasz! I totally agree the AB in-memory cache is the way to go except that it's currently limited to 4Gb. The RAM disk is a work around until this limitation is lifted.
>
> regards,
> Steve
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, Tomasz Janeczko <groups@> wrote:
> >
> > Hello,
> >
> > I don't quite why you would want to use RAM DISK as a "virtual drive"
> > when you can use AmiBroker in-built cache that is always going to be
> > faster than
> > RAM disk and would use less memory. With RAM disk same data are in fact
> > twice in RAM once in virtual disk and second time in AB internal cache.
> >
> > So don't use RAM disk, use AB in-memory cache instead.
> >
> > Best regards,
> > Tomasz Janeczko
> > amibroker.com
> >
> > On 2009-12-15 21:28, smw311 wrote:
> > > Since I still have not been able to get Amibroker 64 on Win7 to run larger databases in memory I decided to try a RAM disk. I just created a 6Gb one and loaded my 5.9Gb database on it. I get slightly less than a 2X speed up. Was hoping for significantly more. :( I remember reading posts in this forum that others have seen 4X - 6X increase. I tried running with and with out a swap file but that does not seem to make a big difference.
> > >
> > > Any thoughts on what else to do to make it go faster would be really appreciated!
> > >
> > > Thanks
> > > Steve
> > >
> > >
> > >
> > >
> > > ------------------------------------
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>
------------------------------------
**** IMPORTANT PLEASE READ ****
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