663 reputation
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location Berkeley, CA
age 24
visits member for 3 years, 6 months
seen Oct 7 at 0:05

I'm a physics student at the University of California.


Aug
31
comment Why is my dual-core CPU recognized as a quad-core one?
The best way to think of HT is a "core-and-a-half" it shares many more resources with its brother than the seperate cores do. However it is capable of executing a thread "on its own" and the OS treats it as a thread execution unit (which you associated with a core).
Aug
30
asked ffmpeg - convert MOV to AVI but decrease frame rate
Aug
16
revised Why I Was Supplied With Power Supply Less Than Recommended?
added 11 characters in body
Aug
16
comment Do x86 applications use 64 bits addresses in x64 operative systems?
You are forgetting that every page table entry has both a virtual part and a real part, both will be doubled when going from a 32 bit system to a 64 bit system (actually a little more because with 4KB pages we are masking the last 12 bits, so we are really going from 24 bits to 52bits in the PT a factor of 2.16). However you right that if we are using 32bit VA to 64 bit PA to begin with then the total change will be only be two fold
Aug
16
revised Why I Was Supplied With Power Supply Less Than Recommended?
added 467 characters in body
Aug
16
comment Do x86 applications use 64 bits addresses in x64 operative systems?
@soandos assuming we keep the same page size (of course that is a maybe) it will quadruple the current page table size. Think about it logically - if we pad pointer in our 32bit PT with 0's just for the hell of it it will at least quadruple in size (assuming a flat PT, which is reasonable enough for a size approximation)
Aug
16
answered Why I Was Supplied With Power Supply Less Than Recommended?
Aug
16
comment Do x86 applications use 64 bits addresses in x64 operative systems?
@soandos, while it is true that for an individual application the difference in pointer size will affect the memory footprint minimally. On the os side - the 64 bit pointer increase will quadruple the size of the page table required. Page tables on a loaded 32 bit system can reach 50MB, quadrupling that is not a small difference.
Aug
15
comment How to determine the WiFi channel from Mac command line?
Mac OS doesn't include wlan-tools (that has iwconfig among other things) and a quick google search on iwconfig apple and similar tells me that you might be SOL.
Aug
15
comment Can Screwdrivers With Magnetic Tips Cause Damage To Electronics?
Hard drive disks are enclosed in an aluminum box that acts as a shield. External fields do not get inside up to the approximation that it acts a perfect conductor.
Aug
15
comment PhysX with ATI + NVidia cards in same computer
@Tom Wijsman its an off-color joke referencing mixed-race marriages and the conservatism of southern states.
Aug
12
comment How to ssh to a linux server behind corporate firewall?
Are you sure your company doesn't have a VPN setup for external access already?
Aug
11
comment Asterisks on Password for Bash Shell (or ssh?)
Why is it a lack-of-usability?
Aug
11
comment How is a 1GPBS 64-bit ethernet card different from a 32-bit one?
64 Bit PCI is probably referring to PCIX a 64 Bit extension to the PCI bus primarily used in servers
Aug
11
comment Can't run executable from any directory
@Drew home directory on unix systems is typically /home/username/ or the shortcut ~/
Aug
11
comment Accessing a URL on SSH without using a web browser
I remember reading an essay once where Richard Stallman (the founder of the FSF and the creater of GNU) described how he accesed websites when he was forced to use computers without a free software browser. He would wget the html of the website and just read the source.
Aug
11
comment Accessing a URL on SSH without using a web browser
Not older, just better :D
Aug
11
comment Why does my computer frequently bog down even when CPU and RAM are not totally filled up?
@surfasb yeah, I find the task manager memory usage graphs to be a little deceitful with regards to how your computer is really using its resources.
Aug
11
comment Why does my computer frequently bog down even when CPU and RAM are not totally filled up?
@Journeyman amen, there is way too much advice on making windows run "properly" that hasn't been relevant since 9x.
Aug
11
comment How did UNIX multitasking work without virtual memory?
To be clear, having the MMU in hardware is a relatively recent innovation (on the unix time-scale). There is nothing stopping you from having the OS do the address translation (albeit it will be much slower than a hardware solution). Although you are correct that this would still require the cpu to support execution modes.