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• Good Choice of Memory for Asus K52F-BBR5

  - by Christopher Painter

  I recently purchased an Asus K52F-BBR5 notebook. It's a basic laptop with an Intel P6100 CPU and Mobile Intel® HM55 Express Chipset. It came with 3GB of DDR3 SODIMM memory and I'd like to expand it to 8GB. I'm a little confused by DDR3 nomenclature and not up to date on my knowledge of chipsets. I'd like to make a good choice when selecting memory for it. Crucial's database suggests using either a PC3-8500 with CAS 7 or a PC3-10600 with a CAS of 9. Is the 8500 better because of it's CAS 7 or will my chipset run the memory async at a higher speed and get better performance? Which would be a better choice for my chipset and CPU? Price difference is negligble.

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• Good advanced book on developing robust C# modules

  - by AlexKuznetsov

  I have some experience with C#, and would like to improve my knowledge of its latest improvements. I am in the middle of reading and enjoying "Effective C#" by Bill Wagner right now. However, I would appreciate more examples, especially with lambda expressions and such. Any suggestions are greatly appreciated. High quality resources are preferable, and it does not matter much if they are free or not.

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• Finding out which higher level function is making lots of low level calls

  - by ming yeow

  Hi folks, I have a function that is being called more than a thousand times, slowing everything down. However, it is a low level function, and do not know which of my high level function is lopping and making these calls. How can i find out?

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• Backup software for Ubuntu - which one?

  - by Industrial

  Hi everybody, I have spent some time testing out different backup solutions for my small home office during the last weeks, but still haven't found anything that have been working out too well yet. We can definitely work with a non-GUI script if that's what it takes, if only the requirements are fulfilled: Upload to Amazon S3 Europe. We get unbelievable slow uploading speed to US, so uploading 400+ GB of data will not be happening anytime this year... Incremental backups - only changed files shall be uploaded or we will have a big bill from Amazon in the end of each month.. Files should not be uploaded in one big per-folder archive. This is not efficient at all, since if we change one file in a subfolder, a huge two-digit GB sized file would have to be uploaded during next backup. Not good for economy again, or traffic overhead on our internet connection. What options are available to us? Thanks!

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• Is there other usage of Comcast extension cable and splitter?

  - by Tim

  I have an unused Comcast high-speed internet self-install kit from 2006. It has two coils of extension cable, and a splitter, and some screws. The name of the cable is "extension cable" printed on the package. I wonder if that is its actual name? As ethernet cables are always useful, I wonder if the extension cables are totally worthless and should be tossed into a trash can? Or are they usable for some other purposes, or even sellable? Thanks! SVI Digital SV-2G Splitter (5/1000MHz): One interface of the cables: Screws

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• DAW with realtime pitchshifting

  - by monov

  I'm very happy with Renoise but it has a problem, it can't do realtime pitchshifting. For example, consider a breakbreat which I want to trigger at different pitches sometimes. Like I keep 'Q' pressed for a 'C' pitch, but then I press 'B' for a lower pitch. In Renoise the resulting beat is not only lower pitch, but also longer/slower. I want it to be the same speed, just a different pitch. I've been doing this externally in Audacity, then keeping a couple of different pitched versions in Renoise but that's tedious. Or consider a melodic segment snipped from a song into a sample. Say I want to play it simultaneously in its real pitch and 5 semitones higher, so it forms a sort of chord effect. Again, no easy way to do this in renoise. Is there a DAW app that does that kind of thing? I've heard of ableton live, it has 'live' in the name so maybe it can do it?

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• Faking a Single Address Space

  - by dsimcha

  I have a large scientific computing task that parallelizes very well with SMP, but at too fine grained a level to be easily parallelized via explicit message passing. I'd like to parallelize it across address spaces and physical machines. Is it feasible to create a scheduler that would parallelize already multithreaded code across multiple physical computers under the following conditions: The code is already multithreaded and can scale pretty well on SMP configurations. The fact that not all of the threads are running in the same address space or on the same physical machine must be transparent to the program, even if this comes at a significant performance penalty in some use cases. You may assume that all of the physical machines involved are running operating systems and CPU architectures that are binary compatible. Things like locks and atomic operations may be slow (having network latency to deal with and all) but must "just work".

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• Home router for higher network loads

  - by Zizzencs

  I'm trying to find a replacement for my ASUS WL500GP router. Some constraints: my ISP now provides 120 Mbit bandwidth - the router must be able to handle it I have 3 computers and a laptop at home - the router must have at least 4 LAN ports and the WAN port I need to be able to do the following in parallel: use bittorrent with ~1000 connections transfer files from one home computer to another at high speed access one home computer from my workplace I don't really need wireless I don't really want two boxes to serve all these purposes. So I was searching for a router with 1 Gbit ports, jumbo frame support and good reviews, but haven't really found a promising candidate so far. Any suggestions?

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• How will I have to update how I program for iPhones now with iOS4?

  - by Devoted

  For example, preparing a launch screen of 320 x 480 would have to be changed.... How is that going to work for us? Are programmers always going to have to be submitting a high-res that will be scaled down for old devices such as the iphone 3g?

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• In node.js slow readable stream attached to a faster pushing message queue eats up memory

  - by Vishal

  In my node.js program I have a response stream attached to a message queue (zeromq) delivering data at a very high rate. Due to slow network connection the response stream and its underlying implementation is unable to consume data at that pace thus occupying a lot of memory. Do you have any suggestion to solve this problem. For reference please see the code snippet below: zmq.on("message", function(data) { res.write(data); // End response on some event });

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• How do I profile memory usage in my project

  - by Gacek

  Are there any good, free tools to profile memory usage in C# ? Details: I have a visualization project that uses quite large collections. I would like to check which parts of this project - on the data-processing side, or on the visualization side - use most of the memory, so I could optimize it. I know that when it comes to computing size of the collection the case is quite simple and I can do it on my own. But there are also certain elements for which I cannot estimate the memory usage so easily. The memory usage is quite big, for example processing a file of size 35 MB my program uses a little bit more than 250 MB of RAM.

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• Best way to copy large amount of data between partitions

  - by skinp

  I'm looking to transfer data across 2 lv of an HP-UX server. I have a couple of those transfers to do, some of which are mostly binary (Oracle tablespace...) and some others are more text files (logs...). Used data size of the volumes is between 100Gb and 1Tb. Also, I will be changing the block size from 1K to 8K on some of these partitions... Things I'm looking for: Guarantees data integrity Fastest data transfer speed Keeps file ownership and permissions Right now, I've thought about dd, cp and rsync, but I'm not sure on the best one to use and the best way to use them...

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• Why are Asynchronous processes not called Synchronous?

  - by Balk

  So I'm a little confused by this terminology. Everyone refers to "Asynchronous" computing as running different processes on seperate threads, which gives the illusion that these processes are running at the same time. This is not the definition of the word asynchronous. a·syn·chro·nous –adjective 1. not occurring at the same time. 2. (of a computer or other electrical machine) having each operation started only after the preceding operation is completed. What am I not understanding here?

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• Why are mainframes still around?

  - by ThaDon

  It's a question you've probably asked or been asked several times. What's so great about Mainframes? The answer you've probably been given is "they are fast" "normal computers can't process as many 'transactions' per second as they do". Jeese, I mean it's not like Google is running a bunch of Mainframes and look how many transactions/sec they do! The question here really is "why?". When I ask this question to the mainframe devs I know, they can't answer, they simply restate "It's fast". With the advent of Cloud Computing, I can't imagine mainframes being able to compete both cost-wise and mindshare-wise (aren't all the Cobol devs going to retire at some point, or will offshore just pickup the slack?). And yet, I know a few companies that still pump out net-new Cobol/Mainframe apps, even for things we could do easily in say .NET and Java. Anyone have a real good answer as to why "The Mainframe is faster", or can point me to some good articles relating to the topic?

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• Component Level Documentation

  - by Jason Summers

  I'm trying to make good on a promise I've made to provide a decent set of documentation for a C# component that I've written. I've done some googling and found templates for software design at high and low level. The problem is that all of the templates seem to be geared towards a complete system design as opposed to individual components and are consequently overkill. Can anyone please point me in the direction of a template geared towards component documentation? Many thanks

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• How to interpret situations where Math.Acos() reports invalid input?

  - by Sean Ochoa

  Hey all. I'm computing the angle between two vectors, and sometimes Math.Acos() returns NaN when it's input is out of bounds (-1 input && input 1) for a cosine. What does that mean, exactly? Would someone be able to explain what's happening? Any help is appreciated! Here's me method: public double AngleBetween(vector b) { var dotProd = this.Dot(b); var lenProd = this.Len*b.Len; var divOperation = dotProd/lenProd; // http://msdn.microsoft.com/en-us/library/system.math.acos.aspx return Math.Acos(divOperation) * (180.0 / Math.PI); }

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• Mathematica & J/Link: Memory Constraints?

  - by D-Bug

  I am doing a computing-intensive benchmark using Mathematica and its J/Link Java interface. The benchmark grinds to a halt if a memory footprint of about 320 MB is reached, since this seems to be the limit and the garbage collector needs more and more time and will eventually fail. The Mathematica function ReinstallJava takes the argument command line. I tried to do ReinstallJava[CommandLine -> "java -Xmx2000m ..."] but Mathematica seems to ignore the -Xmx option completely. How can I set the -Xmx memory option for my java program? Where does the limit of 320 MB come from? Any help would be greatly appreciated.

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• Query about the service or technology behind gmail service

  - by user1726908

  I am a final year computer science student. I am studying in hyderabad, andhra pradesh, india. I have come to know that the gmail is a cloud service. I am very much interested in learning more about cloud computing. This technology has been puzzling,tickling,increasing my curiosity and i just want to learn as much as i can about it. And through experience, i have learnt that practically doing can improve our knowledge and thirst to learn more. Thus, I would like to know "what are the security measures which you have taken to keep the cloud service like gmail secure and authentic? What is the architecture of the service? What are the technologies used in building it? What are the different levels of security applied in general for building a private cloud?"

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• Experience with Intel X25-M 160GB and Oracle

  - by derobert

  We're considering building an Oracle database with 12 Intel X25-M G2 160GB drives in software RAID10. It'd be running Linux. Database gets some very heavy write activity during the early morning data load, other than that it is mostly read-only (and the read load is fairly minimal). We're currently running on 11 150GB Velociraptors (also Linux software RAID10), and are hoping the X25-M will speed up the data load. We currently have redo on different disks than the rest of the data. I'm wondering a few things: Any experience with using X25-M drives for databases? The X25-E are unfortunately beyond our budget. Would it hurt to separate redo off to some magnetic (non-SSD) drives, say 2 (raid1) or 4 (raid10) Seagate Constellations?

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• Backup/Multihomed network connection

  - by J_P

  We have a couple locations that require 24/7 access to Internet and our current provider (AT&T) while mostly good is not always up. My concern would be if I go with another provider (for example Comcast) I'm going to be subject to the same down time if it's in the "last mile". I for the most part don't know where the failure points are on the ISP side but I would imagine the large majority are within the last mile. I'd looked at Mifi or similar solution but have concerns about bandwidth caps and overall speed. Any suggestions would be appreciated.

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• News Portals and database heaviness

  - by jasmine

  What is database design solutions for news portals with high trrafic? Could file system as a good solution? mysql > File system Thanks in advance

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• MVC alternatives: examples of MVA & AVC?

  - by Phillip Oldham

  I'm interested in learning about the alternative patterns to Model-View-Controller, specifically the Model-View-Adapter and Application-View-Controller patterns. Google results tend to be either a high-level overview or Java-based. Can anyone either provide, or point me to, an example of these patterns in either PHP, Python or JavaScript?

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• Perfmon quick rundown

  - by anon

  I've known quite along while about performance monitor on Windows. I have decided now to create a scheduled performance monitoring of my entire system so I can find bottlenecks for future improvements. So as you can imagine this is going to run 24/7 so I can identify peak utilization. With performance monitor on Windows 7 for example where are the logs stored (c:\perfmon)? Is there a log size? Even better is the a website that can get me up to speed with scheduling and best practices of perfmon? (I don't need an explanation of what I can monitor)

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• Django on Windows 2003 Slow Initially

  - by John

  I have setup Django to run on a windows 2003 server following the steps on the django wiki. Everything works fine and there are no errors. Only one instance of Django is setup on the server at the moment. However whenever the first page is requested it takes about 10 seconds to load the page. After this every page loads instantly. All my searches about speed issues with Django on windows refer to the local server, but not when using IIS and PyISAPIe. Thanks

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• VPC on Windows 7 very slow network

  - by Shigg

  I have a Windows 2003 virtual machine which I use for website testing. I've just installed Windows 7 and am using the new version VPC (not xp mode). When I try to copy a file - I need to copy some big databases across - I get a file copy speed of about 20k per sec. Copying from one PC to another on the real network transfers files at 13mb per second. Any ideas what may be causing this? I've turned off differential network compression on win 7. The Virtual HD is on a seperate physical drive to the OS. Running Windows 7 64 bit on a dual xeon with 16gb ram and 10,000 rpm drives. Tried installing VPC 2007 but windows blocks it running saying its not compatable. Many thanks for any ideas.

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