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• I/O intensive MySql server on Amazon AWS

  - by rhossi

  We recently moved from a traditional Data Center to cloud computing on AWS. We are developing a product in partnership with another company, and we need to create a database server for the product we'll release. I have been using Amazon Web Services for the past 3 years, but this is the first time I received a spec with this very specific hardware configuration. I know there are trade-offs and that real hardware will always be faster than virtual machines, and knowing that fact forehand, what would you recommend? 1) Amazon EC2? 2) Amazon RDS? 3) Something else? 4) Forget it baby, stick to the real hardware Here is the hardware requirements This server will be focused on I/O and MySQL for the statistics, memory size and disk space for the images hosting. Server 1 I/O The very main part on this server will be I/O processing, FusionIO cards have proven themselves extremely efficient, this is currently the best you can have in this domain. o Fusion ioDrive2 MLC 365GB (http://www.fusionio.com/load/-media-/1m66wu/docsLibrary/FIO_ioDrive2_Datasheet.pdf) CPU MySQL will use less CPU cores than Apache but it will use them very hard, the E7 family has 30M Cache L3 wichi provide boost performance : o 1x Intel E7-2870 will be ok. Storage SAS will be good enough in terms of performance, especially considering the space required. o RAID 10 of 4 x SAS 10k or 15k for a total available space of 512 GB. Memory o 64 GB minimum is required on this server considering the size of the statistics database. Warning: the statistics database will grow quickly, if possible consider starting with 128 GB directly, it will help. This server will be focused on I/O and MySQL for the statistics, memory size and disk space for the images hosting. Server 2 I/O The very main part on this server will be I/O processing, FusionIO cards have proven themselves extremely efficient, this is currently the best you can have in this domain. o Fusion ioDrive2 MLC 365GB (http://www.fusionio.com/load/-media-/1m66wu/docsLibrary/FIO_ioDrive2_Datasheet.pdf) CPU MySQL will use less CPU cores than Apache but it will use them very hard, the E7 family has 30M Cache L3 wichi provide boost performance : o 1x Intel E7-2870 will be ok. Storage SAS will be good enough in terms of performance, especially considering the space required. o RAID 10 of 4 x SAS 10k or 15k for a total available space of 512 GB. Memory o 64 GB minimum is required on this server considering the size of the statistics database. Warning: the statistics database will grow quickly, if possible consider starting with 128 GB directly, it will help. Thanks in advance. Best,

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• Any reason not to disable Windows kernel paging?

  - by Nathaniel

  So I'm planning on eventually going to 2 GB (mobo max) RAM from 1 GB, and I want to disable kernel paging once I do, because I've heard it can give a performance boost (and that I believe). Any reason not to do it or any general thoughts about it? Edit: for clarification, this is not disabling general RAM paging. This is disabling having kernel memory paged (or at least parts of it, as Charlls noted).

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• can i use 2 diffrent antenna on 1 wrt54gl

  - by franco

  I have my wrt54gl set up as a bridge. I have 15db high gain omni directional antenna now and wanted to add a second directional antenna to boost my gain. Is this possible? Thank You, Franco

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• Can I use two different antenna on a WRT54GL?

  - by franco

  I have my WRT54GL set up as a bridge. I currently have 15db high gain omni-directional antennaand wanted to add a second directional antenna to boost my gain. Is this possible?

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• Using SSD as disk cache

  - by casualcoder

  Is there software for Linux to use an SSD as disk cache? I believe that Sun does something like this with ZFS, though not sure. A quick search provides nothing suitable. The goal would be to put frequently requested files on the SSD on-the-fly. Since the SSD has more capacity than RAM for less money and better performance than hard disk, this should provide an efficient performance boost.

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• USB Drive is Very Slow

  - by Luminose

  I recently bought a Patriot Xporter XT Boost 8GB Flash Drive whish is supposed to be one of the faster flash drives but it seems extremelly slow. For isntance Firefox takes several minutes to load. Are there any tips or tricks to making it run faster? NTFS vs FAT32? Any registry settings or options in device manager?

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• Does software RAID 1 in Windows 7 improve read speeds?

  - by Rich

  As the title says, does software RAID 1 (mirroring) in Windows 7 improve read speeds? I'd like to set up RAID 1 to help protect my important documents (yes, yes, I know it's not a backup), but performance is also important to me. As I understand it, RAID 1 should theoretically be able to improve my read speeds by n times, where n is the number of disks. Is Windows 7 able to get this boost? I haven't been able to find out this information anywhere.

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• How to throttle bandwidth speed from VPS

  - by Burning the Codeigniter

  I was wondering if you can throttle/boost the download speed from my VPS to me, because now and often I download a database which is quite big, typically 5-7GB. My side is quite slow (typically I have max speeds of 100Kb/s) so I was wondering if it's possible to throttle the bandwidth speed from my server to me that it could make the download much faster. If this is possible, how can I do this? My server is running Ubuntu 11.04 with a 100Mbps line.

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• Annoying sound from microphone in headphone

  - by Paul

  I recently bought a Plantronics bluetooth headset for VOIP in Skype. But I am facing an annoying problem. The microphone is really sensitive and I could hear all the background noises and my sound though the headphone (of blutooth headset). I tried to disable the bluetooth headset in Playback devices and I could hear the amplified background noise through speakers! I checked if there is a microphone boost option enabled, but couldn't find it in the properties of the headset recording device

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• Anyone tried boosting Windows performance by putting Swap File on a Flash drive?

  - by Clay Nichols

  Windows Vista introduced ReadyBoost which lets you use a Flash drive as a third (after RAM and HD) type of memory. It occurred to me that I could boost peformance on an old PC here w/ Win XP (32 bit, max'd at 4GB RAM) by putting it's swap file (page file) on a flash drive. (Now, before anyone comments: apparently Flash drives (10-30MB/s transfer rates) are slower than HDD (100+ MB/s) (I'm asking that as a separate question on this forum).

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• How to get true frequencies of Xeon cores in Ubuntu?

  - by Cyrcle

  Does anyone know of a good way to find out what the actual frequencies are of the cores in my Xeon? I'm running Ubuntu 10.04 LTS. I'd like to see if Turbo Boost is working properly, and it's also just nice to keep an eye on what's going on with the system. Thanks.

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• "Raid 0 SAS" versus "2nd generation SSD"

  - by Stefano

  Hi everybody, i was planning to buy a SAS system made of two 15k RPM disks in Raid 0 configuration to give a boost to my s.o. and my apps... but after i saw that article on Coding Horror, i've started to thinking if a new 2nd generation SSD could do the same job, or even better... Does anybody have any information to help me decide?

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• Addition of an Extra link to an existing link.

  - by Lawdricky

  I would like to know how to configure a extra link to my Mikrotik Routern or Cisco 3800 series router.In my office our bandwidth is 1mb, which is insufficient.But an extra 4mb was made available to us by a different ISP/hub.How do we integrate this new link into our existing link to boost our bandwidth (N.B it uses a private IP)?Our router has 2 interfaces:1 to the modem n the other to the switch.Kindly reply asap.

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• How to handle failure to release a resource which is contained in a smart pointer?

  - by cj

  How should an error during resource deallocation be handled, when the object representing the resource is contained in a shared pointer? Smart pointers are a useful tool to manage resources safely. Examples of such resources are memory, disk files, database connections, or network connections. // open a connection to the local HTTP port boost::shared_ptr<Socket> socket = Socket::connect("localhost:80"); In a typical scenario, the class encapsulating the resource should be noncopyable and polymorphic. A good way to support this is to provide a factory method returning a shared pointer, and declare all constructors non-public. The shared pointers can now be copied from and assigned to freely. The object is automatically destroyed when no reference to it remains, and the destructor then releases the resource. /** A TCP/IP connection. */ class Socket { public: static boost::shared_ptr<Socket> connect(const std::string& address); virtual ~Socket(); protected: Socket(const std::string& address); private: // not implemented Socket(const Socket&); Socket& operator=(const Socket&); }; But there is a problem with this approach. The destructor must not throw, so a failure to release the resource will remain undetected. A common way out of this problem is to add a public method to release the resource. class Socket { public: virtual void close(); // may throw // ... }; Unfortunately, this approach introduces another problem: Our objects may now contain resources which have already been released. This complicates the implementation of the resource class. Even worse, it makes it possible for clients of the class to use it incorrectly. The following example may seem far-fetched, but it is a common pitfall in multi-threaded code. socket->close(); // ... size_t nread = socket->read(&buffer[0], buffer.size()); // wrong use! Either we ensure that the resource is not released before the object is destroyed, thereby losing any way to deal with a failed resource deallocation. Or we provide a way to release the resource explicitly during the object's lifetime, thereby making it possible to use the resource class incorrectly. There is a way out of this dilemma. But the solution involves using a modified shared pointer class. These modifications are likely to be controversial. Typical shared pointer implementations, such as boost::shared_ptr, require that no exception be thrown when their object's destructor is called. Generally, no destructor should ever throw, so this is a reasonable requirement. These implementations also allow a custom deleter function to be specified, which is called in lieu of the destructor when no reference to the object remains. The no-throw requirement is extended to this custom deleter function. The rationale for this requirement is clear: The shared pointer's destructor must not throw. If the deleter function does not throw, nor will the shared pointer's destructor. However, the same holds for other member functions of the shared pointer which lead to resource deallocation, e.g. reset(): If resource deallocation fails, no exception can be thrown. The solution proposed here is to allow custom deleter functions to throw. This means that the modified shared pointer's destructor must catch exceptions thrown by the deleter function. On the other hand, member functions other than the destructor, e.g. reset(), shall not catch exceptions of the deleter function (and their implementation becomes somewhat more complicated). Here is the original example, using a throwing deleter function: /** A TCP/IP connection. */ class Socket { public: static SharedPtr<Socket> connect(const std::string& address); protected: Socket(const std::string& address); virtual Socket() { } private: struct Deleter; // not implemented Socket(const Socket&); Socket& operator=(const Socket&); }; struct Socket::Deleter { void operator()(Socket* socket) { // Close the connection. If an error occurs, delete the socket // and throw an exception. delete socket; } }; SharedPtr<Socket> Socket::connect(const std::string& address) { return SharedPtr<Socket>(new Socket(address), Deleter()); } We can now use reset() to free the resource explicitly. If there is still a reference to the resource in another thread or another part of the program, calling reset() will only decrement the reference count. If this is the last reference to the resource, the resource is released. If resource deallocation fails, an exception is thrown. SharedPtr<Socket> socket = Socket::connect("localhost:80"); // ... socket.reset();

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• CSS layout mystery

  - by selfthinker

  Among the many two (or three) column layout techniques I sometimes use the following one: <div class="variant1"> <div class="left1"> <div class="left2"> left main content </div> </div> <div class="right1"> <div class="right2"> right sidebar </div> </div> </div> together with: .variant1 .left1 { float: left; margin-right: -200px; width: 100%; } .variant1 .left1 .left2 { margin-right: 200px; } .variant1 .right1 { float: right; width: 200px; } This works in all major browsers. But for some very strange reason exactly the same technique but reversed doesn't work: <div class="variant2"> <div class="left1"> <div class="left2"> left main content </div> </div> <div class="right1"> <div class="right2"> right sidebar </div> </div> </div> with .variant2 .left1 { float: left; width: 200px; } .variant2 .right1 { float: right; margin-left: -200px; width: 100%; } .variant2 .right1 .right2 { margin-left: 200px; } In the second variant all text in the sidebar cannot be selected and all links cannot be clicked. This is at least true for Firefox and Chrome. In IE7 the links can at least be clicked and Opera seems completely fine. Does anyone know the reason for this strange behaviour? Is it a browser bug? Please note: I am not looking for a working two column CSS layout technique, I know there are loads of them. And I don't necessarily need this technique to work. I only like to understand the reason why the second variant behaves like it does. Here is a link to a small test page which should illustrate the problem: http://selfthinker.org/stuff/css_layout_mystery.html

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• Is variance of for generic type parameters in C# 4.0 a step closer for higher kind types?

  - by Aggelos Mpimpoudis

  We know that implementing classes are still invariant, despite the fact that their interfaces are variant. However I am inquiring, is cov/contravariance a step closer to parametric polymorphism or these are two separate concepts?

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• Best json parser for qt?

  - by Martin

  I'm using QT for Symbian and need a simple json parser. I need to be able to go from json to Qt-variant and the other way around. Is there a simple json parser that I can use? I don't want to write my own. What is the best way to go? Thanks!

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• intellisense functionality in a custom VBA function?

  - by PowerUser

  In the standard IDE for VBA, intellisense is built-in to the standard VBA functions. Can I achieve the same for my custom VBA functions? i.e. can i write something like: Public Function DoSomething(X as string)(Options X="Option1","Option2") as variant

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• Sorted list of file names in a folder in VBA?

  - by Karsten W.

  Is there a way to get a sorted list of file names of a folder in VBA? Up to now, I arrived at Dim fso As Object Dim objFolder As Object Dim objFileList As Object Dim vFile As Variant Dim sFolder As String sFolder = "C:\Docs" Set fso = CreateObject("Scripting.FileSystemObject") Set objFolder = fso.GetFolder(sFolder) Set objFileList = objFolder.Files For Each vFile In objFileList ' do something ' Next vFile but it is crucial to be sure the processing order of the for loop is determined by the file names... Any help appreciated!

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• GCC4.2 build warning : Default deployment version is greater than the max value for the iPhone simul

  - by user255403

  Hi I upgraded an iPhone project from the 2.2.1 SDK to 3.0 SDK recently... And when I build the project I am getting the following warning: GCC 4.2 default deployment target 10.6.2 for architecture 'i386' and variant 'normal' is greater than the maximum value 10.6 for the Simulator - iPhone OS 3.1.2 SDK I have the iPhone OS Deployment target set to iPhone OS 3.0 Any idea what could be causing this 'warning' to show up. Regards - SY

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• Is there a PostgreSQL equivalent of SQL Server profiler

  - by BozoJoe

  I need to see the queries submitted to a PostgreSQL server. Normally I would use SQL Server profiler to perform this action in SQL Server land, but I'm yet to find how to do this in PostgreSQL. There appears to be quite a few pay-for tools, I am hoping there is a open source variant.

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• How do I change the Django default test database?

  - by BryanWheelock

  The production database is named: project_db The default test db is: test_project_db My production server provider requires the database name start with the account name. So I could go with: projects_db_test or some variant.

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• What's the difference between tiny, huge and small in vim on MacPorts

  - by TK

  I'm trying to install vim via MacPorts. I found this port at http://trac.macports.org/browser/trunk/dports/editors/vim/Portfile. There are variants like tiny, small and huge. Is there any way to tell which variant installs what features?

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• 301 redirect vs parking

  - by Pat

  I have several domain names registered, each a slight variant of each other. E.g, fastcar.com fast-car.com fastcar.co.uk fast-car.co.uk etc.. I don't wish to be penalized for duplicate content or spammy links by any of the major search engines. Should I park them all directly on the main domain I wish to promote, 301 redirect them to the main domain or not use them at all? Thanks

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• Confusing .gitignore syntax

  - by tmslnz

  I was reading http://www.kernel.org/pub/software/scm/git/docs/gitignore.html and the 6 points used to explain the ignore patterns seem to be describing a custom variant of a glob search syntax. I am more familiar with Mercurial, which allows to explicitly ignore via glob or regex patterns, no questions asked. Is there anything similar functionality in Git? Can anyone point me to some more exhaustive reference than the Git man page? Best, t

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