When interstellar clouds of gas and dust start to knot up or are compressed by a shockwave from a nearby supernova, they start to gravitationally collapse. The higher density draws in more material and eventually a star starts to form in the center with a disk of dust and gas encircling it...
Very interesting, thanks for sharing.
Feynman was really brilliant and is often listed as a major figure that physicists respect and aspire to the level of. I want to read that book now ...
It's also interesting because it kind of demonstrates that weather you are using modern computers...
I know the way my parameter file is handled isn't ideal, I've just been focusing my efforts on getting the number crunching portion of it to run (^_^;). I'm the only one who uses it, so I've been careful about keeping my parameter file in order, it's that is definitely on the to-fix list!
I believe I've solved my problem, which is quite a different problem from what I thought it was!
My program reads some initial parameters from a text file. Some of them are of type bool and were read like this:
bool sourcediscrimination;
getline(infile, line);
position =...
@Ancalagon44 - It does both actually. It does a lot of FP calculations with doubles in one stage, then int calculations in another. It constantly flips back and forth between these two stages.
I appreciate everyone's input, the Google performance tool will be helpful. Right now though I'm...
@Schmide - the Linux machine has 2.4 Ghz Core2Duo P8600 with 3mb cache and the Macbook has a 2.16 Ghz Core2Duo T7400 with 4mb cache. Cache affects performance on memory heavy, number crunching apps (which this is), but I wouldn't expect this big of a difference between those two.
I've had...
Thanks for the responses.
@degipson - I saw that but posted here hoping for a variety of ideas and to her personal preferences on the tools for the job.
As for the other questions, I don't think the hard drive is particularly relevant as it's not accessed while the program is running on...
On OS X under Activity Monitor I can choose "sample process" and see what percentage of time what functions are taking and it's been very useful. Is this what you mean by CPU profile?
I'm not sure how to do it on Linux, any info. you could point me to would be greatly appreciated.
Thanks for the reply.
Libtiff is only used at the end to output an image after a lot of calculation. It represents an extreme minority of the execution time.
Both cores are being utilized to 100% and this can be seen under System Monitor.
The Linux machine has 4 gigs of RAM and the Mac...
Hello.
I'm a hobbyist programmer and have stumbled across a curious problem that I hope someone can give me some insight on.
I wrote an app in C++ using g++ on my OS X 10.6 MacBook. It's command-line only. It reads some numbers from a small TXT file, does a lot of number crunching using...
We've all heard many times how a spoonful of neutron star material would weigh millions of tons (or more) on Earth and such. But what I want to know is if we could theoretically somehow take a spoonful of a neutron star, wouldn't it explode insanely violently the second it was no longer in the...
I am by no means a physics expert, but we know that matter warps the fabric of space-time and too much matter warps it to the point where it curves in on itself (aka blackhole), and physics begins to run crazy.
I heard before that energy (aka radiation) also affects space-time and that...
Great, thanks for the reply!
I can speak and read Japanese, but not with enough proficiency to have it as my computer's default language.
I was fortunate to have the chance to visit Taipei two years ago. I thought it was a pretty cool city!
Hi everyone,
I live in Japan and want to upgrade my Intel Macbook to Snow Leopard. I was wondering if there are different internationalized versions of OS X or if it is just one version where you set the region upon installation? I am considering ordering it from the Japanese amazon.com web...
The drifting away of the Moon is clearly explained via a mechanism other than cosmic expansion. If you measure the rotation period of the Moon around the Earth, the rotation (day length) of the Earth, and the forces the tidal bulge that the Moon causes on the Earth and how the tidal bulge...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.