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• ClearTrace Supports Statement Level Events

  - by Bill Graziano

  One of the requests I get on a regular basis is to capture the performance of statement level events.  The latest beta has this feature available.  If you’re interested in this I’d like to get some feedback. I handle the SP:StmtCompleted and the SQL:StmtCompleted events.  These report CPU, reads, writes and duration. I’m not in any way saying it’s a good idea to trace these events.  Use with caution as this can make your traces much larger. If there are statement level events in the trace file they will be processed.  However the query screen displays batch level *OR* statement level events.  If it did both we’d be double counting. I don’t have very many traces with statement completed events in them.  That means I only did limited testing of how it parses these events.  It seems to work well so far though.  Your feedback is appreciated. If you ever write loops or cursors in stored procedures you’re going to get huge trace files.  Be warned. I also fixed an annoying bug where ClearTrace would fail and tell you a value had already been added.  This is a result of the collection I use being case-sensitive and SQL Server not being case-sensitive.  I thought I had properly coded around that but finally realized I hadn’t.  It should be fixed now. If you have any questions or problems the ClearTrace support forum is the best place for those.

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• Script language native extensions - avoiding name collisions and cluttering others' namespace

  - by H2CO3

  I have developed a small scripting language and I've just started writing the very first native library bindings. This is practically the first time I'm writing a native extension to a script language, so I've run into a conceptual issue. I'd like to write glue code for popular libraries so that they can be used from this language, and because of the design of the engine I've written, this is achieved using an array of C structs describing the function name visible by the virtual machine, along with a function pointer. Thus, a native binding is really just a global array variable, and now I must obviously give it a (preferably good) name. In C, it's idiomatic to put one's own functions in a "namespace" by prepending a custom prefix to function names, as in myscript_parse_source() or myscript_run_bytecode(). The custom name shall ideally describe the name of the library which it is part of. Here arises the confusion. Let's say I'm writing a binding for libcURL. In this case, it seems reasonable to call my extension library curl_myscript_binding, like this: MYSCRIPT_API const MyScriptExtFunc curl_myscript_lib[10]; But now this collides with the curl namespace. (I have even thought about calling it curlmyscript_lib but unfortunately, libcURL does not exclusively use the curl_ prefix -- the public APIs contain macros like CURLCODE_* and CURLOPT_*, so I assume this would clutter the namespace as well.) Another option would be to declare it as myscript_curl_lib, but that's good only as long as I'm the only one who writes bindings (since I know what I am doing with my namespace). As soon as other contributors start to add their own native bindings, they now clutter the myscript namespace. (I've done some research, and it seems that for example the Perl cURL binding follows this pattern. Not sure what I should think about that...) So how do you suggest I name my variables? Are there any general guidelines that should be followed?

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• Outlook macro runs through 250 iterations before failing with error [migrated]

  - by Senoculus

  Description: I have an Outlook macro that loops through selected emails in a folder and writes down some info to a .csv file. It works perfectly up until 250 before failing. Here is some of the code: Open strSaveAsFilename For Append As #1 CountVar = 0 For Each objItem In Application.ActiveExplorer.Selection DoEvents If objItem.VotingResponse <> "" Then CountVar = CountVar + 1 Debug.Print " " & CountVar & ". " & objItem.SenderName Print #1, & objItem.SenderName & "," & objItem.VotingResponse Else CountVar = CountVar + 1 Debug.Print " " & CountVar & ". " & "Moving email from: " & Chr(34) & objItem.SenderName & Chr(34) & " to: Special Cases sub-folder" objItem.Move CurrentFolderVar.Folders("Special Cases") End If Next Close #1 Problem After this code runs through 250 emails, the following screenshot pops up: http://i.stack.imgur.com/yt9P8.jpg I've tried adding a "wait" function to give the server a rest so that I'm not querying it so quickly, but I get the same error at the same point.

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• Can no longer boot with rEFIt and Grub on early 2006 MacBook Pro

  - by Don Quixote

  I don't know what happened to cause this. I have Snow Leopard, Ubuntu 11.04 Natty Narwhal and Windows XP SP3 on my early 2006 MacBook Pro. It is a Core Duo unit, NOT Core 2 Duo, so it is 32-bit only - Model Identifier MacBookPro1,1. I use rEFIt 0.14 for my boot menu. For some reason neither XP nor Ubuntu would boot anymore. I'd just get a black screen with a rapidly flashing underscore in the top-left corner. Having both those OSes failing to boot suggested a problem with the boot loader in my MBR. The rEFIT partition tool verified that my MBR partitions were still synced with my GPT partitions, so I rewrote my MBR partition table with fdisk while booted from Parted Magic: # fdisk /dev/sda (fdisk warns about the disk having a GPT. I press on anyway.) p (Print the existing partition table to make sure it's OK.) w (Write the old partition table back to disk. This also writes a new MBR boot loader.) After this XP would boot but Ubuntu would not, with the same symptom. Now I used update-grub while chrooted into Ubuntu from Parted Magic: # mount /dev/sda3 /mnt # mount --bind /dev /mnt/dev # mount --bind /sys /mnt/sys # mount --bind /proc /mnt/proc # chroot /mnt Chroot issues some warnings about not being able to identify some group IDs. I don't know why that happens, or whether it is a problem. At this point while I am still booted off of Parted Magic's kernel, I am running from Natty's filesystem. # update-grub Update-grub detects each of my operating systems then claims to complete successfully, but still won't boot. I asked this same question over at rEFIt's Sourceforge support forum but there have been no replies yet. I also Googled quite a bit, and see many who have the same black screen problem, but none of their situations seem quite like mine. Thanks for any help you can give me. -- Don Quixote

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• How do I get wireless and video working on a Sony Vaio vpc-z21x9r

  - by Alex

  OS: Ubuntu 11.10 Kernel: 2.6.37.6 Laptop: sony vaio vpc-z21x9r The problem: I can't change level of screen backlight; also can't enable wi-fi. While using 3.0 kernel everything is ok, but the laptop discharges too quickly. Results for lspci 02:00.0 Network controller: Intel Corporation Centrino Wireless-N + WiMAX 6150 (rev 5f) VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) there is no wlan0 in ifconfig -a too. I've fount that kernel should already have drivers for this graphics controller, but when i load up in restore mode, it writes "fall" while trying to load up some video drivers. To change the level of backlight i've alrady tried: xbacklight -set XX , smartdimmer -s XX and got this init_ nvclock() failed! also sudo setpci -s 00:02.0 F4.B=XX with no results. As for wi-fi, i've found driver but i don't understand how to install it. Here it is How can I fix these problems? Thank you for your help and time! Also tried to fix problems with backlight writing GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor Still no results. Is there any sense in recompiling kernel, I mean 2.6.37.6. Can it make any improvements in the situation?

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• Hot Off the Press - Oracle Exadata: A Data Management Tipping Point

  - by kimberly.billings

  Advances in data-management architecture - including CPU, memory, storage, I/O, and the database - have been steady but piecemeal. In this report, Merv Adrian describes how Oracle Exadata not only provides the latest technology in each part of the data-management architecture, but also integrates them under the full control of one vendor with a unified approach to leveraging the full stack. He writes, "the real "secret sauce" of Oracle Exadata V2 is the way in which these technologies complement each other to deliver additional performance and scalability." Merv interviews two Exadata customers, Banco Transylvania and TUI Netherlands, and concludes that early indications are that Oracle Exadata is delivering on its promise of extreme performance and scalability. His recommendation to IT is to target corporate applications with the biggest potential for speed-based enhancement, and consider whether Oracle Exadata V2 can cost-effectively enable new ways to use these for competitive advantage. Read the full report. var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-13185312-1"); pageTracker._trackPageview(); } catch(err) {}

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• Lack of PHP experience = reduced compensation?

  - by Jake Tacholsavacky

  I interviewed for a C++ position at this company, and while they say that I knocked my interview out of the park, they also say that I am too senior for the position. Instead they would like to offer me a job programming in PHP. Unfortunately my PHP experience is limited. Because of this, they are expecting me to take a significant drop in salary with the hope that I will master PHP within a year and be promoted at my first annual performance review. I don't believe that this is reasonable. I agree with Joel when he writes, "Don’t look for experience with particular technologies." If they thought I was such a superstar, then they should have realized that I am capable of being productive in PHP within weeks, not a year! It seems like just an excuse to underpay me. Notwithstanding the fact that I was insulted by this offer, I think that I would be taking on much more risk than they would be; they won't guarantee what my post-PHP salary would be. What does the Stack Exchange community think about this offer? Would you take it?

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• MQTT, GWT, ActiveMQ stack to bring jms to the browser

  - by scphantm

  I am in the preliminary stages of architecting a legacy replacement project. They already have sub half second performance on their green screens and they want the same on their web app. We have a 390 mainframe that can handle anything we throw at it but they don't have a good jvm for it, so we have two tiers of websphere servers between the mainframe and the browser, The ui server, and the bl server. For the ui, I'm leaning towards GWT. But one thing that I think would seal the deal is to add messaging capabilities to the browser. The idea is say you click on a link that displays a second panel of information, instead of the classic GWT where it triggers a GWT-RPC call to the ui server, the ui server routs it to the bl server, the bl sends it to the mainframe and back out, it drops an MQTT message directly to the bl server or directly to the mainframe. Say writes go to the bl, reads go to the mainframe. This is an easy enough thing in classic jms because you can issue a message that has an expected response. Then have your callback ready to get the resonse. But from what I'm reading so far. It looks like mqtt doesn't have that. It looks like it's strictly fire and forget, which would make it really tough to come up with a way to get a response back to the workstation that called it. Am I right here? Has anyone tried this stack before with gwt.

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• General Availability: Simplified User Experience Design Patterns eBook

  - by ultan o'broin

  Karen Scipi (@karenscipi) writes: The Oracle Applications User Experience team is delighted to announce that our Simplified User Experience Design Patterns for the Oracle Applications Cloud Service eBook is available for free. Working with publishers McGraw-Hill, we're pleased to make the eBook available in EPUB (for use on Apple iOS devices), MOBI (ideal for Amazon Kindle), and PDF (for anything with Adobe Reader) versions. The Simplified User Experience Design Patterns for the Oracle Applications Cloud Service eBook We’re sharing the same user experience design patterns, and their supporting guidance on page types and Oracle ADF components that Oracle uses to build simplified user interfaces (UIs) for the Oracle Sales Cloud and Oracle Human Capital Management (HCM) Cloud, with you so that you can build your own simplified UI solutions. Click to register and download your free copy of the eBook Design patterns offer big wins for applications builders because they are proven, reusable, and based on Oracle technology. They enable developers, partners, and customers to design and build the best user experiences consistently, shortening the application's development cycle, boosting designer and developer productivity, and lowering the overall time and cost of building a great user experience. Developers use the eBook to build their own simplified UIs with Oracle ADF and Oracle JDeveloper Now, Oracle partners, customers and the Oracle ADF community can share further in the Oracle Applications User Experience science and design expertise that brought the acclaimed simplified UIs to the Cloud and they can build their own UIs, simply and productively too!

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• Is this technique for stat tracking without a database workable?

  - by baptzmoffire

  If I wanted to create a chess game, for iOS, that tracked both player moves (for retracing the progression of a game and for player stats), what would be the simplest route to take? To clarify, I want to track not only the moves a player has made in a particular game, but how often that player has made that move in past games. For example I want to be able to track: How many times a given player has opened by moving the king pawn up two squares (e4) as white, on move number one. What is the percentage of time the player responds to white's e4 opening move, with moving his own king pawn to e5? What percentage of time does he respond by moving his queenside bishop pawn to c5? And so on. If it's not clear, the stat tracking system should also be able to report how many times this player, as black, move his queen to h1, on move number 30. I'm using Parse.com for my back-end as a server (BaaS) service. If I were to create a class that writes strings that identify move number, player color, moved piece, algebraic notation of the square (e.g. "d8") to a file, locally in the file system saves the file to Parse, and deletes the temporary file from file system upon opening the same game in my tableview (a la a "With Friends" game), download this file from Parse, parse through it and retrieve all stats/history, assign all relevant values to variables Is this plan viable, or is there an easier way?

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• Writing a DB Python or Ruby

  - by WojonsTech

  I am planning on writing a database. I know it's crazy and people will tell me there is no good reason to do so. I am really using it to get better at programming overall, this database wont be used in production. I am planning on writing it Ruby or Python. I have some experience with both languages, but no job or large project experience. I don't want this to be a this is better than that randomly I really need some facts. The things that I need to know are which of the language are better at the following things. Searching arrays/hashes? Sorting? Threading? Sockets? Memory management? Disk Reads/Writes? base64 encode/decode? Again this is just a project for myself. I will port it on github for the hell of it, but I don't expect it to be amazing or going up against mysql or mongodb any day.

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• How do I get my programs to communicate with each other

  - by Benjamin Lindqvist

  I'm basically just getting started with programming. The problem I have with progressing is that I have a hard time learning stuff just for the sake of knowing them - I do better when there's a problem to be solved or a task to be completed so I can learn 'on the job'. So I'm interested in starting some interesting project. I know the basics of Python, Java, Matlab and some C++ aswell and I know enough about microcontrollers to make LED blink etc. The type of stuff I'm looking for is for example scraping some weather forecast site (with Python) and outputting the chance of rain to a LCD display, or a program that makes chrome open and log in to facebook if I say "HAL, time for facebook", or more generally, a program that reads serial/USB input, looks for certain sequences and sends instructions to some other program if it finds one. Do you open some kind of shared stream in which one program reads and one writes? What do I need to read up on to do accomplish this myself? I have no experience with linux or the linux terminal, but looking over peoples shoulders makes me suspect that's what people use. Is that correct?

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• UDF Partition reported full when it is not

  - by Capt.Nemo

  I was using these instructions to setup an external hard disk with udf. I have been able to setup a multi-partition system using those instructions, but I seem to have hit a wall, where the partition is reported as full while writing to the disk. Every other tool available to me reports it as free. Relevant lshw output Here's a screenshot showing the disk: Both the output of df and the file manager (caja) report the disk as free. Filesystem Size Used Avail Use% Mounted on /dev/sda9 9.0G 7.6G 910M 90% / udev 974M 12K 974M 1% /dev /dev/sda1 50G 47G 295M 100% /media/Data /dev/sda6 49G 41G 5.9G 88% /home /dev/sda2 155G 127G 29G 82% /media/Entertainment /dev/sda8 14G 13G 516M 96% /media/Stuff /dev/sdb2 120G 1.9G 112G 2% /media/3c887659-5676-4946-875b-b797be508ce7 /dev/sdb3 11G 2.6G 7.7G 25% /media/108b0a1d-fd1a-4f38-b1c6-4ad1a20e34a3 /dev/sdb1 802G 34G 768G 5% /media/disk I seem to have hit a wall near the 35GB mark. Despite being shown as 35gb/860gb used everywhere, the following happens on a write attempt: [2017][/media/Dory]$ echo D>>echo bash: echo: write error: No space left on device Writing byte by byte, the maximum I can take it to is 34719248K. The most weird part is that on mounting it Windows, Windows can write to the disk easily, and the writes are being read fine back in Ubuntu. However, the used-bytes remains at 34719248K in Ubuntu (It goes higher on Windows, however).

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• Best design for a "Command Executer" class

  - by Justin984

  Sorry for the vague title, I couldn't think of a way to condense the question. I am building an application that will run as a background service and intermittently collect data about the system its running on. A second Android controller application will query the system over tcp/ip for statistics about the system. Currently, the background service has a tcp listener class that reads/writes bytes from a socket. When data is received, it raises an event to notify the service. The service takes the bytes, feeds them into a command parser to figure out what is being requested, and then passes the parsed command to a command executer class. When the service receives a "query statistics" command, it should return statistics over the tcp/ip connection. Currently, all of these classes are fully decoupled from each other. But in order for the command executer to return statistics, it will obviously need access to the socket somehow. For reasons I can't completely articulate, it feels wrong for the command executer to have a direct reference to the socket. I'm looking for strategies and/or design patterns I can use to return data over the socket while keeping the classes decoupled, if this is possible. Hopefully this makes sense, please let me know if I can include any info that would make the question easier to understand.

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• SQL Server Database Settings

  - by rbishop

  For those using Data Relationship Management on Oracle DB this does not apply, but for those using Microsoft SQL Server it is highly recommended that you run with Snapshot Isolation Mode. The Data Governance module will not function correctly without this mode enabled. All new Data Relationship Management repositories are created with this mode enabled by default. This mode makes SQL Server (2005+) behave more like Oracle DB where readers simply see older versions of rows while a write is in progress, instead of readers being blocked by locks while a write takes place. Many common sources of deadlocks are eliminated. For example, if one user starts a 5 minute transaction updating half the rows in a table, without snapshot isolation everyone else reading the table will be blocked waiting. With snapshot isolation, they will see the rows as they were before the write transaction started. Conversely, if the readers had started first, the writer won't be stuck waiting for them to finish reading... the writes can begin immediately without affecting the current transactions. To make this change, make sure no one is using the target database (eg: put it into single-user mode), then run these commands: ALTER DATABASE [DB] SET ALLOW_SNAPSHOT_ISOLATION ONALTER DATABASE [DB] SET READ_COMMITTED_SNAPSHOT ON Please make sure you coordinate with your DBA team to ensure tempdb is appropriately setup to support snapshot isolation mode, as the extra row versions are stored in tempdb until the transactions are committed. Let me take this opportunity to extremely strongly highly recommend that you use solid state storage for your databases with appropriate iSCSI, FiberChannel, or SAN bandwidth. The performance gains are significant and there is no excuse for not using 100% solid state storage in 2013. Actually unless you need to store petabytes of archival data, there is no excuse for using hard drives in any systems, whether laptops, desktops, application servers, or database servers. The productivity benefits alone are tremendous, not to mention power consumption, heat, etc.

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• Switching mdadm to an external bitmap

  - by Oli

  I've just read this in another post about improving RAID5/6 write speeds: After increasing stripe cache & switching to external bitmap, my speeds are 160 Mb/s writes, 260 Mb/s reads. :-D I've already found out how to increase the stripe cache and this worked pretty well but I'd like to know more about an external bitmap. I have an incredibly fast (540MB/s) RAID0 SSD that would do well if a bitmap does what I think it does but I'm still very unsure. I've only known about them as long as I've known this post. A few questions: What is a bitmap (in terms of mdadm)? What are the advantages of an internal bitmap (over external)? What are the advantages of an external bitmap (over internal)? How do I switch between the two? I should add that while this is a I'm-bored-let's-break-something thread, I do value the data stored on the RAID array. If doing this is going to put data at significant risk, please let me know.

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• How can I stop a process from moving to the background?

  - by Alex

  I have a machine running Ubuntu server version 12.04.3 LTS. On it, I'm attempting to run a node.js server that needs to stay up and running at all times. I'm running into an issue, however, where periodically I see this happen: [1]+ Stopped sudo node server.js When this happens, I have to manually bring it back with fg, which works fine, at least until it stops again. As far as I can tell, it isn't functioning properly while stopped, since I get no log files in those windows of time. So my question is this: Is there a way to prevent it from being stopped like that? I'm running it in a tmux window, if that changes anything. Also, to address the question before it gets asked: I'm running it as sudo due to some ecryptfs issues I've been having. I was originally running it in my home directory, but when it was left alive for too long things would get out of sync and the file writes it has to do would just stop working. To mitigate that, I moved it out of my home directory, but its new location requires me to use sudo permissions for everything to work correctly. Hopefully that isn't related to the whole background task thing. (sudo and tmux tags included in case one or both turn out to actually be relevant to the solution.)

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• Old Lock Retrofitted for Wireless and Key-free Entry

  - by Jason Fitzpatrick

  What do you do if the old key your landlord gave you is poor fit for your apartment’s lock? If you’re the geeky sort, you build a wireless unlocking module to do the work for you. Instructables user Rybitski writes: The key to my apartment never worked quite right because it is a copy of a copy of a copy. I am fairly certain that the dead bolt is original to the building and the property manager seems to have lost the original key years ago. As a result unlocking the door was always a pain. Changing the lock wasn’t an option, but eliminating the need to use a key was. To that end, he built the device seen in the video above. An Arduino Uno drives a servo which in turn opens the deadbolt. The whole thing is controlled by a simple wireless key fob. Hit up the link below for the full build guide including code. Key Fob Deadbolt [via Hack A Day] How To Delete, Move, or Rename Locked Files in Windows HTG Explains: Why Screen Savers Are No Longer Necessary 6 Ways Windows 8 Is More Secure Than Windows 7

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• How to write code that communicates with an accelerator in the real address space (real mode)?

  - by ysap

  This is a preliminary question for the issue, where I was asked to program a host-accelerator program on an embedded system we are building. The system is comprised of (among the standard peripherals) an ARM core and an accelerator processor. Both processors access the system bus via their bus interfaces, and share the same 32-bit global physical memory space. Both share access to the system's DRAM through the system bus. (The computer concept is similar to Beagleboard/raspberry Pie, but with a specialized accelerator added) The accelerator has its own internal memory (SRAM) which is exposed to the system and occupies a portion of the global address space (as opposed to how a graphics card would talk to teh CPU via a "small" aperture in the system memory space). On the ARM core (the host) we plan on running Ubuntu 12.04. The mode of operation of communicating between the processors should be that the host issues memory transactions on the system bus that are targeted at the accelerator internal memory. As far as my understanding goes, if I write a program for the host that simply writes to the physical address of the accelerator, most chances are that the program will crash due to a segmentation violation. So, I assume that I need some way of communicating with the device in real mode. What is the easiest way to achieve this mode of operation?

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• What You Said: How You Share Your Photos

  - by Jason Fitzpatrick

  Earlier this week we asked you to share your favorite tips, tricks, and tools for sharing photos with friends and family. Now we’re back to highlight the ways HTG readers share their pics. Image available as wallpaper here. By far the most popular method of photo sharing was to upload the pictures to cloud-based storage. Many readers took advantage of sizable SkyDrive accounts. Dragonbite writes: I used to use PicasaWeb (uploaded from Shotwell) until I got the SkyDrive w/25 GB available. My imported pictures are automatically synchronized with SkyDrive and I then send out a link to whomever I want. I have another (desktop) computer where all of the pictures are stored from mine and my wife’s camera’s imports so if I need to free up some space on SkyDrive or my Windows 7 laptop, I double-check they are in the desktop computer before deleting them from my laptop (and thus from SkyDrive as well). I wish SkyDrive enabled some features like rotate, or searching by Tagged person. 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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• Why is a software development life-cycle so inefficient?

  - by user87166

  Currently the software development lifecycle followed in the IT company I work at is: The "Business" works with a solution manager to build a Business Requirement document The solution manager works with the Program manager to build a Functional Spec The PM works with the engineering lead to develop a release plan and with the engineering team to develop technical specifications If there are any clarifications required, developers contact the PM who contacts the solution manager who contacts the business and all the way back introducing a latency of nearly 24 hours and massive email chains for any clarifications By the time the tech spec is made, nearly 1 month has passed in back and forth Now, 2 weeks go to development while the test writes test cases Code is dropped formally to test, test starts raising bugs. Even if there is 1 root cause for 10 different issues, and its an easily fixed one, developers are not allowed to give fresh code to test for the next 1 week. After 2-3 such drops to test the code is given to the ops team as a "golden drop" ( 2 months passed from the beginning) Ops team will now deploy the code in a staging environment. If it runs stable for a week, it will be promoted to UAT and after 2 weeks of that it will be promoted to prod. If there are any bugs found here, well, applying for a visa requires less paperwork This entire process is followed even if a single SSRS report is to be released. How do other companies process such requirements? I'm wondering why, the business cannot just drop the requirements to developers, developers build and deploy to UAT themselves, expose it to the business who raise functional bugs and after fixing those promote to prod. (even for more complex stuff)

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• Being rocked...

  - by ZacHarlan

  After almost four and half years, I finally escaped from the world of telemarketing.     I'm now at a place that writes really good code, values testing, does routine code reviews, collaborates with each other so continuously and effectively somebody should make a documentary about it!   Today alone, I had two really smart and well respected developers go line by line through my code and show me how to make it better.  Seriously, people pay really good money for something like this and they don't get near the quality of feedback as I got!     +1 for me finally getting to a point in my career where i get to work with some of the best of the best in the software world!   I've been rocked by the fact that places like this actually exist.     I've been Rocked by the sheer size, complexity and simplicity of our website.     Most importantly I've been ROCKED by the fact that this many smart people check their egos at the door, gel together and look for ways to make software better than how they found it.  This is how to grow a business with tech... hire great people and watch them go!   Seriously, bravo.

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• Minimum percentage of free physical memory that Linux require for optimal performance

  - by csoto

  Recently, we have been getting questions about this percentage of free physical memory that OS require for optimal performance, mainly applicable to physical compute nodes. Under normal conditions you may see that at the nodes without any application running the OS take (for example) between 24 and 25 GB of memory. The Linux system reports the free memory in a different way, and most of those 25gbs (of the example) are available for user processes. IE: Mem: 99191652k total, 23785732k used, 75405920k free, 173320k buffers The MOS Doc Id. 233753.1 - "Analyzing Data Provided by '/proc/meminfo'" - explains it (section 4 - "Final Remarks"): Free Memory and Used Memory Estimating the resource usage, especially the memory consumption of processes is by far more complicated than it looks like at a first glance. The philosophy is an unused resource is a wasted resource.The kernel therefore will use as much RAM as it can to cache information from your local and remote filesystems/disks. This builds up over time as reads and writes are done on the system trying to keep the data stored in RAM as relevant as possible to the processes that have been running on your system. If there is free RAM available, more caching will be performed and thus more memory 'consumed'. However this doesn't really count as resource usage, since this cached memory is available in case some other process needs it. The cache is reclaimed, not at the time of process exit (you might start up another process soon that needs the same data), but upon demand. That said, focusing more specifically on the percentage question, apart from this memory that OS takes, how much should be the minimum free memory that must be available every node so that they operate normally? The answer is: As a rule of thumb 80% memory utilization is a good threshold, anything bigger than that should be investigated and remedied.

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• Gathering IP address and workstation information; does it belong in a state class?

  - by p.campbell

  I'm writing an enterprisey utility that collects exception information and writes to the Windows Event Log, sends an email, etc. This utility class will be used by all applications in the corporation: web, BizTalk, Windows Services, etc. Currently this class: holds state given to it via public properties calls out to .NET Framework methods to gather information about runtime details. Included are call to various properties and methods from System.Environment, Reflection details, etc. This implementation has the benefit of allowing all those callers not to have to make these same calls themselves. This means less code for the caller to forget, screw up, etc. Should this state class (please what's the phrase I'm looking for [like DTO]?) know how to resolve/determine runtime details (like the IP address and machine name that it's running on)? It seems to me on second thought that it's meant to be a class that should hold state, and not know how to call out to the .NET Framework to find information. var myEx = new AppProblem{MachineName="Riker"}; //Will get "Riker 10.0.0.1" from property MachineLongDesc Console.WriteLine("full machine details: " + myEx.MachineLongDesc); public class AppProblem { public string MachineName{get;set;} public string MachineLongDesc{ get{ if(string.IsNullOrEmpty(this.MachineName) { this.MachineName = Environment.MachineName; } return this.MachineName + " " + GetCurrentIP(); } } private string GetCurrentIP() { return System.Net.Dns.GetHostEntry(this.MachineName) .AddressList.First().ToString(); } } This code was written by hand from memory, and presented for simplicity, trying to illustrate the concept.

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• SSD I/O extremely slow installing/booting Ubuntu 12.04

  - by Menda

  These are some useful specs: Macbook Pro 7,1 OWC Mercury Extreme Pro 2,5" SATA SSD (120 GB). Has SandForce driver. Ubuntu 12.04 Desktop 32 bits. One 18 GB partition for GNU/Linux and 1.5 GB for SWAP. MD5 for the Ubuntu install CD is OK. I tried to install Ubuntu. It seems that everything is recognized, but there's a big problem: read and writes to the SSD are extremely slow. For example, the install process, which shouldn't take more than 20 minutes, it takes 7 hours. Then, booting up the computer takes about 20 minutes. I checked and the problem is definitely the SSD. Every access to any file is like 10 times slower than normal. I have tried to format the partition as Ext4 and Ext3 with the same problem. Trying to install other distros like Fedora 17, I have a similar problem. There's a "lag" with the SSD, but not so accused as in Ubuntu. Surprisingly, Debian 6.0 installs and works without any problem. Mac OS works pretty good as well in the other partition, so I discard it's an SSD problem. Thanks for your help!

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