Visit Our UNIX and Linux User Community


How Wolfram Alpha could change software

 
Thread Tools Search this Thread
Special Forums News, Links, Events and Announcements Complex Event Processing RSS News How Wolfram Alpha could change software
# 1  
Old 08-01-2009
How Wolfram Alpha could change software

by Neil McAllister, InfoWorld Don’t call Wolfram Alpha a search engine. Billed by its creators at Wolfram Research as a “computational knowledge engine,” Wolfram Alpha uses mathematical techniques to cross-reference myriad specialized databases, producing unique results for each query. For example, query Wolfram Alpha for “San Francisco New York elevation” and you get back a page [...]

More...

Previous Thread | Next Thread

6 More Discussions You Might Find Interesting

1. SCO

How to change raid controller driver ? (hardware change)

Hello I'm trying to virtualize an instance of Sco Unix 5.0.5 in VirtualBox (called VM-A) , but sco I have problems set to launch with the new raid controller . The physical machine has a raid controller adaptec (alad driver) but VirtualBox uses buslogic (blc driver) What ... (3 Replies)
Discussion started by: flako
3 Replies

2. Shell Programming and Scripting

Change the content of files but not change the date

I have 100 files in a directory , all the files have a word "error" and they are created in different date . Now I would like to change the word from "error" to "warning" , and keep the date of the files ( that means do not change the file creation date after change the word ) , can advise what can... (7 Replies)
Discussion started by: ust3
7 Replies

3. Shell Programming and Scripting

Change the content of files but not change the date

I have 100 files in a directory , all the files have a word "error" and they are created in different date . Now I would like to change the word from "error" to "warning" , and keep the date of the files ( that means do not change the file creation date after change the word ) , can advise what can... (0 Replies)
Discussion started by: ust3
0 Replies

4. What is on Your Mind?

Thinking of career change to software development

I'm currently administering applications and unix OS. Have no IT degree, learned on the job over last 6-7 years. Have good shell scripting skills, basic perl, know some apache, mysql, sql etc. I enjoy scripting, setting up scripts to use in conjunction with databases and apache etc. I think... (3 Replies)
Discussion started by: frustrated1
3 Replies

5. Solaris

Change hostid for software install - license issue

Hi all. Solaris 9. After I change the hostid, how can I change it back without rebooting the machine? Thanks (2 Replies)
Discussion started by: jamie_collins
2 Replies

6. Shell Programming and Scripting

Getting current time from wolfram.com using python

Hello to all, I am looking of a python script that can fetch date & time from wolfram or any website that gives correct time. 1. Open woflram.com website 2. Search query "time" 3. Search result displays the time. The script has to contact the website with the search query, take that... (5 Replies)
Discussion started by: frozensmilz
5 Replies
mb(9r)																	    mb(9r)

NAME
mb - General: Performs a memory barrier SYNOPSIS
void mb( void ); ARGUMENTS
None DESCRIPTION
The Alpha architecture does not guarantee read/write ordering. That is, the memory subsystem is free to complete read and write operations in any order that is optimal, without regard for the order in which they were issued. Read/write ordering is not the same as cache coherency, which is handled separately and is not an issue. The Alpha architecture also contains a write buffer (as do many high-perfor- mance RISC CPUs, including the MIPS R3000). This write buffer can coalesce multiple writes to identical or adjacent addresses into a single write, effectively losing earlier write requests. Similarly, multiple reads to the same identical or adjacent addresses can be coalesced into a single read. This coalescing has implications for multiprocessor systems, as well as systems with off-board I/O or DMA engines that can read or modify memory asynchronously or that can require multiple writes to actually issue multiple data items. The mb (memory barrier) routine guarantees ordering of operations. The mb routine is derived from the MB instruction, which is described in the Alpha Architecture Reference Manual. The mb routine is a superset of the wbflush routine that ULTRIX drivers use. For compatibility, wbflush is aliased to mb on Tru64 UNIX Alpha systems. You call mb in a device driver under the following circumstances: To force a barrier between load/store operations After the CPU has pre- pared a data buffer in memory and before the device driver tries to perform a DMA out of the buffer Before attempting to read any device CSRs after taking a device interrupt Between writes Device drivers and the operating system are the primary users of the mb routine. However, some user programs, such as a graphics program that directly maps the frame buffer and manipulates registers, might need to call mb. The operating system does not provide a C library routine for mb. User programs that require use of mb should use the following asm construct: #include <c_asm.h> asm ("mb"); NOTES
In most situations that would require a cache flush on other CPU architectures, you should call the mb routine on Tru64 UNIX Alpha systems. The reason is not that mb is equivalent to a cache flush (as it is not). Rather, a common reason for doing a cache flush is to make data that the host CPU wrote available in main memory for access by the DMA device or to access from the host CPU data that was put in main mem- ory by a DMA device. In each case, on an Alpha CPU you should use a memory barrier to synchronize with that event. One example of using mb occurs with an Ethernet network controller. Each Ethernet network controller has a unique Ethernet hardware address that is typically contained in a ROM on the Ethernet controller board. The Ethernet hardware address is a multibyte sequence typically con- sisting of at least 10 bytes. This multibyte Ethernet hardware address is frequently read from the controller hardware by the driver's probe routine by issuing a sequence of reads to the same controller register. Each successive read returns the next byte of the Ethernet hardware address. In such instances, a call to mb should be inserted between each of these read operations to ensure that successive read operations are not coalesced into fewer actual reads as seen by the Ethernet controller. RETURN VALUES
None mb(9r)

Featured Tech Videos