erlang에서 비교시간만큼 sleep 하기

1> T1=erlang:now().
{1245,308617,699162}
2> T2=erlang:now().
{1245,308624,48042}
3> Tdiff=timer:now_diff(T2,T1).
6348880
4> Tdiff div 1000.
6348
5> timer:sleep(Tdiff div 1000).
ok

Unix 시스템간의 명령 비교?

http://www.bhami.com/rosetta.html

SC09 Offers Student Mentoring and Grants for Travel Assistance

SC09, the international conference for high performance computing, networking, storage and analysis, takes place November 14-20, 2009 in Austin, Texas.

SC09, sponsored by the ACM and the IEEE Computer Society, offers a complete technical education program and exhibition to showcase the many ways high performance computing, networking, storage and analysis lead to advances in scientific discovery, research, education and commerce. http://supercomputing.org/

The SC09 Broader Engagement (BE) initiative will award participation grants to provide travel assistance to individuals from groups that have traditionally been under-represented in computing.

Applications for SC09 Broader Engagement travel assistance grants are being accepted through August 3, 2009. In addition to receiving complimentary conference registration, grant recipients will be reimbursed for their SC09 lodging and transportation expenses. Applications are encouraged from students and young professionals in all computing-related disciplines.

For more information, including a link to the application form, go to:
http://sc09.supercomputing.org/?pg=broadeng.html

To Read

고민하는 힘.

쾌도난마 한국 경제
커맨딩 하이츠 - http://www.kbs.co.kr/1tv/sisa/come/about/index.html
그룹 지니어스
나쁜 사마리아인들
생각이 차이를 만든다

GCC 4.3 Release Series Porting to the New Tools

http://gcc.gnu.org/gcc-4.3/porting_to.html


The GCC 4.3 release series differs from previous GCC releases in more than the usual list of new features. Some of these changes are a result of bug fixing, and some old behaviors have been intentionally changed in order to support new standards, or relaxed in standards-conforming ways to facilitate compilation or runtime performance. Some of these changes are not visible to the naked eye, and will not cause problems when updating from older GCC versions.

However, some of these changes are visible, and can cause grief to users porting to GCC 4.3. This document is an effort to identify major issues and provide clear solutions in a quick and easily-searched manner. Additions and suggestions for improvement are welcome.

STRUCT 키워드에서 :1 사용법

here is a little feature that allows you to save a little space.

main()   { struct Flags {   unsigned int Online :1; unsigned int Mounted :1; } struct Flags TapeInfo; TapeInfo.Online = 1; TapeInfo.Mounted = 0; }

The :1 tells the compiler that only 1 byte is required for Online and Mounted. There are a few points to note about this though.

• You may expect the compiler to reserve 2 bytes for the structure, it actually reserves one word (usually 4 bytes) as this is the smallest unit that can be reserved, the remaining 2 bytes are unavailable. This is still better than the 2 words that wold normally get reserved.
• You can put any number into the variable, if the number is too large to fit, the high order bits are lost without warning.
• Only signed int, unsigned int, int support this syntax.

출처 : http://www.space.unibe.ch/comp_doc/c_manual/C/SYNTAX/struct.html

FreeBSD 64bit 에서 아파치 실행

FreeBSD 64bit  에서는  /boot/loader.conf 에  accf_http_load="YES"  라고 입력해 주어야 실행된다.