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Climate model on a mac project: #9 Getting in running in MacOS X

tmoore — Tue, 03 Jun 2008 22:33:00 +0000

One misgiving about running a climate model on the mac is that I don't trust linux to handle the Mac's fans to keep the mac cool. Apparently, there is even more to it. The mac also will throttle memory bandwidth if the ram gets too hot (see technote TN2156). Whether or not a Linux install not targeted to a Mac would handle these issues, I don't know.

All those worries seem to be moot, however. I managed to get the model running within Leopard. The next few posts will concern some of the details of how this was accomplished.

Climate model on a mac Project #8: Memory Upgrade...

tmoore — Sat, 31 May 2008 15:39:00 +0000

The minimum ram requirement for the climate model was 2 gig, which is what came with the computer. However, I decided to get 8 more gig for the system. At first, I left the original 2 gig in the machine (arranged according to the docs). However, this caused an enormous performance hit: the system was 12% slower running the model. Dropping the original 2 gig brought the speed back up, more or less, to my original performance figures. I'm still not sure that this was a memory arrangement problem or a mixed-card-size problem...

Climate Model on a Mac Project #6: Success!

tmoore — Fri, 23 May 2008 17:35:00 +0000

After a long struggle trying to work with various compilers, today, I decided to try the Portland C/Fortran compilers. I've had success with them before. Fortunately for me, it worked! I actually got the model running at a low resolution! Tomorrow, I'll try a high resolution.

Climate Model on a Mac Project #1

tmoore — Wed, 14 May 2008 14:55:00 +0000

Computer clusters can be expensive to buy and expensive to maintain. My current linux cluster has 18 CPUs, and takes up about 13U of rack space in a colocation facility, and uses 17-18 amps of power.

Disaster Recovery

tmoore — Tue, 26 Feb 2008 08:00:00 +0000

My big fear is losing all my data in some sort of system crash. Well, I just had a system crash last week (bad hard drive). As it turned out, it was marginally painful. My backup system was designed for managing my data. Fortunately, my data were on the drive that survived. The dead drive housed the system OS.

After some false starts, I managed to find an old copy of the system and restored it onto a new disk. Within a few hours, the system was back up to normal, more or less.

SATA vs. Firewire vs. USB 2.0

tmoore — Tue, 13 Feb 2007 08:00:00 +0000

I’ve been needing a serious evaluation of my backup habits. One area is mixing my storage media for longer-term backup. Up until now, I’ve been using DVD’s, but given the hundreds of gigabytes of data I can create in a month or two, and questions regarding long-term storage of writable DVD media, I’ve begun delving into the possibility of using hard drives as part of an overall strategy. But the world of external drives has become exceedingly complicated. Firewire (IEEE-1394), USB 2.0, and more recently SATA/ESATA.