Re: [amibroker] OT:4 GiB of RAM and MacBookPro

[bilbod <bilbod@xxxxxxxxxx>]

Dennis and Ron,

My 2 ¢.

Whenever you run software under an emulator or VM there will be a performance hit even if it is small.

Apple has something called bootcamp that runs Windows programs (never tried it, don't have a Mac).

According to bench marks I have seen, Parallels is not the fastest VM.

Xen (http://www.xen.org/xen/) and KVM (http://kvm.qumranet.com/kvmwiki) both are qemu  (http://fabrice.bellard.free.fr/qemu/) based and work on Linux (I think Xen is being ported to the Mac). They are kernel modules that take advantage of Intel's and AMD's hardware virtualization.

Performance wise VMWare (http://www.vmware.com/) and VirtualBox (http://virtualbox.org/) are next. VMWare has been around a long time and is the most polished of the VM software. It costs $189 for single user license and runs on multiple platforms. VirtualBox is free for personal use.

I know a developer who uses VMWare and likes it a lot. He says performance degradation is no more than 10%-20%. I've been testing VirtualBox under Linux running W2K Pro. It runs significantly faster on my AMD64 X2 4000 in the VM than it runs on my AMD XP 2800 on the native hardware.

I have several issues with Macs.

1. IMO they are over priced (some say grossly over priced).
2. They use sudo in a way for which it was never intended which reduces security (Ubuntu Linux et al are doing the same thing).
3. They are stingy with ram and use low end video cards in there base models.
4. There are viruses showing up for the Mac which leads me to believe it is only a matter of time before Macs will need to run virus software which will degrade their performance.

Bill

Dennis Brown wrote:

I would install 4GB RAM and XP home and parallels.  Then allocate 2GB to the XP virtual machine.  You can run all the overhead software on the Leopard side and AB on the XP side on different cores.  Trading will then be on a small clean XP machine that can stay that way.

Best regards,

Dennis

On Feb 28, 2008, at 12:02 PM, Ronald Davis wrote:

I interpret WIKI to be saying that the newer models MacBookPro, when outfitted with 4GiB of installed RAM,

will really be able to process "MASSIVE AMOUNTS OF AMIBROKER STOCHK, RSI, CCI, ETC" faster than a similar Windows based machine.

Below is what Wiki says about newer models MacBookPro and their ability to FULLY UTILIZE 4GiB of installed RAM.>http://en.wikipedia.org/wiki/MacBook_Pro.

I will appreciate hearing how others interpret what This WIKI article says. Ron D.

The current models support up to 4 GiB of RAM, though they ship with 2 GiB included. The memory front side bus (FSB) is still 667 MHz, while the processor's FSB is 800 MHz. The earliest models support a maximum of 2 GiB (two 1 GiB modules or one 2 GiB module). More recent Merom models based on the "Napa Refresh" chipset could have 4 GiB installed, but could only utilize a smaller and sometimes less efficient 3 GiB of RAM. It was inefficient if used as a combination of two different capacity slots (one 2 GB and one 1 GB).[3] When two 2 GB memory modules are installed the "About This Mac" shows 4 GB, but on these models the Activity Monitor applications reports 3.0 GB as the total amount of physical RAM available. Newer models can address and fully utilize 4 GiB of RAM without an issue.

Ron D.

-- 
Bill

wjdandreta@xxxxxxx

Gentoo Linux X86_64 2.6.20-gentoo-r8

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