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 [email protected], "smw311" <st...@...> 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 [email protected], 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 > > > > > > > > > > > > > > > ------------------------------------ > > > > > > **** IMPORTANT PLEASE READ **** > > > This group is for the discussion between users only. > > > This is *NOT* technical support channel. > > > > > > TO GET TECHNICAL SUPPORT send an e-mail directly to > > > SUPPORT {at} amibroker.com > > > > > > TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at > > > http://www.amibroker.com/feedback/ > > > (submissions sent via other channels won't be considered) > > > > > > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: > > > http://www.amibroker.com/devlog/ > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > >
