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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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• Check if string is serialized in PHP

  - by Industrial

  Hi everyone, I am in the middle of building a cache layer for the Redis DB to my application and I have come to the point where's it's about to take care of arrays. I wonder if there's any good (high performance!) way of controlling an string to be serialized or not with PHP? Thanks a lot!

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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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• Domain Hosting, DNS/NS Management [closed]

  - by ledy

  What criteria do you have for choosing the right provider for registering a domain? (not hosting, only the domain) So far, I can only see the different pricing and features of the DNS manager but have no idea what I have to pay attention in addition to this. How to know about the quality of the provider's nameserver and could there be differences in speed concerns. Background: The hosting itself incl. webspace, server etc. is separate from the domain and I am not going to book the domain with the same hoster as the webspace/server hoster.

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• What was the most stupid code mistake you have ever made?

  - by Ramesh

  What was the most stupid code mistake you have ever made that had great consequences, e.g. you were fired? For example, a friend of mine wrote a cycle with conditional statement for break that was never true, which caused one high-loaded site to hang up for the whole night.

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• Google Visualization Spacing

  - by Mike

  I have a chart similar to the one below using the Google Visualization API. My problem is that on the right side of where the key is for this chart(where it says low, medium, high) there is too much white space. How can I get rid of this white space?

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• criticle join query mysql

  - by Bharanikumar

  i have table country and having country name and country code, i have customer table having countomer mobile number like customer_mobile field values like 0044-123456798 , 0024-582654753 , 012-52686145 , i want to populate my country oce into combo, that country name should in customer table which country code count is high that country name should come in the dropdown list top , How to write the join query... Thanks

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• Partially parse C++ for a domain-specific language

  - by PierreBdR

  I would like to create a domain specific language as an augmented-C++ language. I will need mostly two types of contructs: Top-level constructs for specialized types or declarations In-code constructs, i.e. to add primitives to make functions calls or idiom easier The language will be used for scientific computing purposes, and will ultimately be translated into plain C++. C++ has been chosen as it seems to offer a good compromise between: ease of use, efficiency and availability of a wide range of libraries. A previous attempt using flex and bison failed due to the complexity of the C++ syntax. The existing parser can still fail on some constructs. So we want to start over, but on better bases. Do you know about similar projects? And if you attempted to do so, what tools would you use? What would be the main pitfalls? Would you have recommendations in term of syntax?

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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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• How to build a web based chat application similar to gmail using java at backend logic

  - by manu

  Hii, I want to built a web based chat using j2ee at backend logic.i want to implement the similar way the gmail do,so that performance of application doesnr degrade.please suggest what type of architecture shoul i follow.load of application would be high.

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• How much visitors could handle my server ?

  - by coolboycsaba

  I have a website, and I want to host it on my own computer, but I'm wondering if it's good enough. The website check`s if the user is logged in and then displays 15 items (title, description) from a mysql database and the rating (stored in another database) and the comments (another database) for each item. It also displays some stats (number of items, comments). I also have an image for each item. My specs are: AMD Athlon 64 X2 Dual Core Processor 5600+ 2.90 GHz RAM memory: 4.00GB Windows 7 64bit So what do you think, how much visitors and items could it handle (at once or daily) ? My internet connection is good, around 7-10 mb upload and same download speed

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• How to remove the pause during JBoss 5.1.0 GA boot between ProfileServiceBootstrap and AnnotationCreator?

  - by rrc7cz

  I've managed to strip down my JBoss profile enough that it boots in 1.5 minutes. I started with the web profile and started pulling out stuff I didn't need. The bulk of my boot time can be seen here: ... 15:21:51,890 INFO [ProfileServiceBootstrap] Loading profile: ProfileKey@86d597[domain=default, server=default, name=np] 15:22:55,406 WARN [AnnotationCreator] No ClassLoader provided, using TCCL: org.jboss.managed.api.annotation.ManagementComponent 15:22:55,578 WARN [AnnotationCreator] No ClassLoader provided, using TCCL: org.jboss.managed.api.annotation.ManagementComponent ... Does anyone have any idea what JBoss is doing here for 1 minute? If so, is there any way to speed it up or skip it entirely? This is for developer instances, so boot time is quite important.

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• Problem with Lenovo x200s Wifi under Ubutu Karmic

  - by oneself

  Hi, I have just gotten my Lenovo X200s laptop, and I am install Ubuntu 9.10 Karmic on it. The installation went through without a hitch, but I can't get my wifi to work. lspci | grep Network Produces the following results: 00:19.0 Ethernet controller: Intel Corporation 82567LM Gigabit Network Connection (rev 03) 03:00.0 Network controller: Realtek Semiconductor Co., Ltd. Device 8172 (rev 10) The weird part is that when I turn the wifi hardware stitch on and off on the side of the laptop, I get the following printed in /var/log messages: Dec 30 23:24:48 temp-laptop kernel: [ 213.432302] usb 4-2: USB disconnect, address 2 Dec 30 23:24:52 temp-laptop kernel: [ 217.276310] usb 4-2: new full speed USB device using uhci_hcd and address 3 Dec 30 23:24:52 temp-laptop kernel: [ 217.441759] usb 4-2: configuration #1 chosen from 1 choice Does Ubuntu think my wifi card is a USB device? Am I missing some driver? What can I do to fix this? Please, help!

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• News Portals and mysql queries

  - by jasmine

  Consider a news portal like cnn. There is 8 categories. Is there 8 query in every page loading? For eg SELECT title FROM category where cID = 1 SELECT title FROM category where cID = 2 ................... And for sites with high traffic, would be memcache a good solution? Thanks in advance

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• Can I extend my total RAM by buying more, and what kind do I need to buy

  - by Xeon06

  I currently have 4 GB total RAM and I would like to get some more, to bring it to a total of 8 GB. Is it possible to simply buy another 4 GB and bring it to 8? If so, what kind should I be buying? There is a lot of different possibilities, DDR3, DDR2, clock speed, etc. I am kind of lost among all this. My current setup goes like this: ACER EG43M mainboard Intel(R) Core(TM)2 Quad CPU Q8200 @ 2.33GHz 4 total RAM slots, 2 occupied by 2 GB sticks According to CPU-Z, my memory type is DDR3 (not sure how reliable that is) Full CPU-Z dump Windows 7 64-bit So basically, I want to know whether it's possible to extend my current RAM to get 8 GB total by buying another 4, and if so, what kind of RAM do I need? Note that I am not looking for shopping recommendations. I'm worried about the hardware compatibility.

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• Windows 8 Hidden Downloading? Slow Internet?

  - by EApubs

  After upgrading to Windows 8, im facing a very slow download speed. My router and the NIC is working fine because on the same PC I also have Linux. In Linux, everything works fine. When checking through the task manager, it shows that the system use the full bandwidth 1Mbps even without a download. The process menu doesn't show whats taking much bandwidth. The bitdefender's firewall also shows network activity. Is there any hidden apps downloading? How to fix this?

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• please help me to choose good boks on algorithms

  - by davit-datuashvili

  i want to help me to choose good books on algorithms many people from this site say me that show me your code and now i ask u to help me to choose good books on algorithms please i have not books on algorithms and in case i decide to buy it of course must buy book which has high quality yes? so please any ideas ?links everything

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• how to design LAN connectivity between private and corporate ?

  - by maruti

  there is a bunch of servers connected to shared storage in a private LAN (10.x.x.x). this privateLAN is managed by a windows server (DHCP, DNS and directory services). how can these hosts be accessed from outside of this privateLAN? Eg. Remote desktop. can the NIC2 on each of the hosts be connected to the other public LAN (compromising speed or security? what are improtant considerations: additional hardware? like switches? routing&DNS software?

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• Visual Studio 2010 locking referenced Assembly

  - by cunningdave

  I have a sandbox app that is built from the simple WPF Application template. This sandbox references an assembly that I am also building which contains the definition of a UserControl (WPF). I am instantiating this user control in the sandbox, to test the control's behaviour. The point of all this is to speed up development. This worked fine, but recently the .Vshost.exe paired with the sandbox process won't shut down. This prevents me from recompiling the Controls library, though ironically I can recompile the sandbox application. I can't kill the vshost process with Task Manager... only restarting VS2010 will clear it out. But every time I run the application from VS, the process just hangs there, blocking my workflow. I'm at a loss. Any ideas what could be causing this? Or does someone have any proposed workaround (mega-kill switch, perhaps?)

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• Installing WiFi in a church for internet access

  - by Dave Griffiths

  Hi, a colleague at work asked this question: My local church want to get WiFi enabled in the whole of their offices and main church building. The offices and main building are in the same overall structure and so the signal does not need to travel outside to any other buildings outside this main structure. Where would I start on such a project and what kind of repeaters are needed (and how are they set up) given that some of the walls are pretty thick. Do you still have one ADSL line coming in to router or are there some options of having two lines coming in so that they isn't a single point of failure. Am looking at fibre for the broadband for increased speed. Any starting pointers appreciated.

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• Rejecting new HTTP requests when server reaches a certain throughput

  - by user56221

  I have a requirement to run an HTTP server that rejects new HTTP requests (with a 503, or similar) when the global transfer rate of current HTTP responses exceeds a certain level. For example, if the web server is transferring at 98Mbps, and a new HTTP request arrives, we would want to reject this (as we couldn't guarantee a good speed). I've had a look at mod_cband for Apache, limit_req for nginx, and lighttpd's rate limiting features, but none of them seem to handle my (rather contrived, granted) use case. I should add that I'm open to using pretty much any web server, and am open to implementing this in iptables rules if someone can craft such a rule! (Refusing the TCP connection is fine, it doesn't have to respond with an HTTP 503). Any suggestions?

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• Shortcut with arguments in Debian

  - by Duncan

  I have a volume on a debian server which contains a large number of images at full resolution in various folders. What I'd like to do is have a separate sort of browse proxy folder which contains lower quality browse copies of these to enable users to access them for viewing over lower speed dial in accounts. I'd ideally like these to be created on the fly using ImageMagick so there isnt the need to store the large number of browse copies full time and worry about keeping them up to date etc The way I'd invisaged this happening is the browse proxy folder containing a duplicate file and folder structure but with symlinks pointing to a script to transform them with the file path as an argument. Except I know this isnt possible with symlinks so am wondering if there's another way of doing this on linux. On windows shortcuts can take arguments and I'm wondering how to do the same on a Linux platform? (or perhaps I'm going about this the wrong way?)

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• Pushing image changes to multiple servers

  - by gms8994

  I need the ability to push images out to multiple servers whenever they're updated. I've looked at Network Filesystems, but they're all but worthless due to their speed. Images can be uploaded to any one of 3 servers, and would then need to be copied to the other 2. Any suggestions? I'm open to try just about anything. EDIT: Graphics data (jpg, gif, png, etc). Linux only. We're currently using rsync. But having it work back and forth is getting cumbersome. It's all local network.

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• SQL - when should you use "with (nolock)"

  - by Andy White

  Can someone explain the implications of using "with (nolock)" on queries, when you should/shouldn't use it? For example, if you have a banking application with high transaction rates and a lot of data in certain tables, in what types of queries would nolock be okay? Are there cases when you should always use it/never use it?

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• Best web technology for building dynamic charts

  - by Ryan

  I need to build a custom designed bar chart that displays some simple data. Below are my requirements. Can anyone suggest the best web technology for my requirements. high browser compatibility ability to draw shapes ability to fill shapes with gradients ability to have onclick and onmouseover events for the different shapes (bars in the chart). Thanks guys. I was thinking of using svg but looking for suggestions.

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