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  • How do I calculate the amount of tuning needed for my server ?

    - by Low Kian Seong
    I have a server which is running a few discrete Python, Java application which most of the time imports data into a PostGreSQL database. I would like to know from people out there who have experience tuning enterprise grade servers how do i go about calculating in a holistic way the amount of tuning needed for my server for example vm.swappiness, vm.overcommit_ratio and other numerical tunings needed for my server. I tried to enable sar on my server to capture daily numbers but these are more along the lines of total numbers and I can't figure out how to allocate memory for my applications. Help would be appreciated. Thanks.

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  • How can I see logs in a server after a kernel panic hang ?

    - by Low Kian Seong
    I am running a production gentoo Linux machine, and recently there was a situation where the server hung in my co-located premises and when I got there I noticed that the server was hung on what appeared to be a kernel panic hang. I rebooted the machine with a hard reboot and was disappointed to find out that I could not find a shred of evidence anywhere on why the machine hung. Is it true that when I do a hard reboot the messages itself will get lost or is there a setting I can do somewhere say in syslog-ng or maybe in sysctl to at least preserve the error log so that I can prevent such mishaps from happening in the future ? I am running a 2.6.x kernel by the way. Thanks in advance.

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  • How can I get an AdWords ad to show up for a specific term ASAP?

    - by Eric
    I have a very specific situation... I have a client who has a site, backed by a celebrity, selling a comment product.... so imagine my site is all about "Martha Stewart used cars" (that's not it-- but you get the idea). My client wants to see their site show up ASAP in Google search results. While I'm waiting for organic search to kick in and recognize my site, index it properly, etc, I want to buy some adwords for keywords like "Martha Stewart used cars" and "Martha Stewart used car" and so forth and have the ads show up on the 1st page of search results. I've done this. The problem is that many, many other advertisers have set up ads on the keyword "used cars" so my Martha-specific ads never are shown. Even when I bid specifically on the keyword phrase "Martha Stewart used cars" and I enter that directly into Google, it doesn't show my ad. SO MY QUESTION.... how/what can I do to get my ads to show... or really, can I do anything else to get my client's site to show on the result page? (I'm not interested in anything black-hat or illegal; I'm just trying to throw some resources at this situation so when those folks looking SPECIFICALLY for "Martha Stewart used cars" will get to the site quickly.) thanks-- Eric

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  • How can I see logs in a server after a kernel panic hang?

    - by Low Kian Seong
    I am running a production gentoo Linux machine, and recently there was a situation where the server hung in my co-located premises and when I got there I noticed that the server was hung on what appeared to be a kernel panic hang. I rebooted the machine with a hard reboot and was disappointed to find out that I could not find a shred of evidence anywhere on why the machine hung. Is it true that when I do a hard reboot the messages itself will get lost or is there a setting I can do somewhere say in syslog-ng or maybe in sysctl to at least preserve the error log so that I can prevent such mishaps from happening in the future ? I am running a 2.6.x kernel by the way. Thanks in advance.

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  • no A record show in the answer section in dig results

    - by eric low
    To check the record for the domain, run dig with domain name as the parameter. dig example.com any I get the below result. Why there is no A record show in the result. What did i do wrong during the setup. Please advice what suppose to look into it. Hope everyone can help me to resolve the case asap. ; <<>> DiG 9.9.3-P2 <<>> example.com any ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44674 ;; flags: qr rd ra; QUERY: 1, ANSWER: 8, AUTHORITY: 4, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;example.com. IN ANY ;; ANSWER SECTION: example.com. 3489 IN MX 100 biz.mail.com. example.com. 3482 IN NS ns1.domain.com. example.com. 3482 IN NS ns2.domain.com. ;; AUTHORITY SECTION: example.com. 3482 IN NS ns2.domain.com. example.com. 3482 IN NS ns1.domain.com. ;; Query time: 0 msec ;; SERVER: xxx.252.xxx.xxx#53(xxx.252.xxx.xxx) ;; WHEN: Wed Oct 30 04:48:34 CDT 2013 ;; MSG SIZE rcvd: 349

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  • configure a Macbook Pro to use external monitor at boot (Debian Linux)

    - by Eric
    In the spirit of reuse, I've installed Debian (version 6.0.5 "squeeze") on my wife’s old Macbook Pro (circa 2009 or so), to repurpose it for various tasks. The catch is the display is flaky. It will last a random amount of time, between 2 minutes and 2 hours, before freezing and graying out. This is a known issue with that generation of MBP. Fortunately it’s no problem for me, as I plan to use it with an external monitor anyway. Which brings us to the problem: How do I configure this thing to output to the external display by default, and hopefully disable the built-in LCD? The ideal solution would be to modify a setting in the EFI (BIOS), but I’m not holding out much hope for that. Next best thing would be a kernel option I can pass to the NVIDIA driver. What won’t work is a solution that doesn’t give me a display until X starts. I need to have console access, especially given that the built-in LCD is dying, and any day now might give out completely. So far I haven’t been able to find anything online. lspci says I’ve got an NVIDIA GeForce 9400M Help is much appreciated! Eric PS if this question is better suited to the Unix & Linux area, pls advise and I will move it.

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  • What is the best log rotator for Python wsgi applications ?

    - by Low Kian Seong
    I am running a wsgi based application that has concurrent users accessing it. For my logs needs I tried logrotate but found that logrotate is not too friendly to Python applications, so I tried using RotatingFileHandler and even worse found my logs all chopped up and part of it went missing! I am considering ConcurrentRotatingFileHandler, my question is, has anyone out there experienced the same thing and better yet do you have any battle tested solution for Python wsgi, concurrently accessed applications?

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  • What is the best way to handle the multitude of different logs created all around the place?

    - by Low Kian Seong
    I run a few applications which creates their own logs. Then I run cron scripts on the same server to do importing of data for my app. When these cron errors out, the default is it sends emails to the user that runs the cron job. There are just too many places that I need to check the logs and mails for stuff that might have potentially went wrong. My question is, what is the best way to do this or even better is like a log parser application which will go through all the system logs when something really goes wrong instead of me having to go through it daily?

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  • What is the best free or low-cost Java reporting library (e.g. BIRT, JasperReports, etc.) for making

    - by Max3000
    I want to print, email and write to PDF very simple reports. The reports are basically a list of items, divided in various sections/columns. The sections are not necessarily identical. Think newspaper. I just wasted a solid 2 days of work trying to make this kind of reports using JasperReports. I find that Jasper is great for outputing "normalized" data. The kind that would come out of a database for instance, each row neatly describing an item and each item printed on a line. I'm simplifying a bit but that's the idea. However, given what I want to do I always ended up completely lost. Data not being displayed for no apparent reason, columns of texts never the correct size, column positioning always ending up incorrect, pagination not sanely possible (I was never able to figure it out; the FAQ gives an obscure workaround), etc. I came to the conclusion that Jasper is really not built to make the kind of reports I want. Am I missing something? I'm ready to pay for a tool, as long as the price is reasonable. By reasonable I mean a few $100s. Thanks. EDIT: To answer cetus, here is more information about the report I made in Jasper. What I want is something like this: text text text text ------------------- text | text text |---------- text | text text | text --------| text text |---------- text | text What I made in jasper is this: (detail band) subreport | subreport ------------------------------------ subreport | subreport ------------------------------------ subreport | subreport The subreports are all the same actual report. This report has one field (called "field") and basically just prints this field in a detail band. Hence, running a single subreport simply lists all items from the datasource. The datasource itself is a simple custom JRDatasource containing a collection of strings in the field "field". The datasource iterates over the collection until there are no more strings. Each subreport has its own datasource. I tried many different variations of the above, with all sorts of different properties for the report, subreports, etc. IMO, this is fairly simple stuff. However, the problems I encounter are as follows: Subreports starting from the 3rd don't show up when their position type is 'float'. They do show up when they have 'fix relative to top'. However, I don't want to do this because the first two subreports can be of any length. I can't make each subreport to stretch according to its own length. Instead, they either don't stretch at all (which is not desirable because they have different lenghts) or they stretch according to the longest subreport. This makes a weird layout for sure. Pagination doesn't happen. If some subreports fall outside the page, they simple don't show. One alternative is to increase the 'page height' considerably and the 'detail band height' accordingly. However, in this case it is not really possibly to know the total height in advance. So I'm stuck with calculating/guessing it myself, before the report is even generated. More importantly, long reports end up on one page and this is not acceptable (the printout text is too small, it's ugly/non-professional to have different reports with different PDF page lengths, etc.). BTW, I used iReport so it's possibly limitations of iReport I'm listing here and not of Jasper itself. That's one of the things I'm trying to find out asking this question here. One alternative would be to generate the jrxml myself with just static text but I'm afraid I'll encounter the very same limitations. Anyway, I just generally wasted so much time getting anything done with Jasper that I can't help thinking its not the right tool for the job. (Not to say that Jasper doesn't excel in what it's good at).

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  • 3ds Max with Parallels on a MacBook Pro

    - by Eric Koslow
    I am trying to get 3ds Max to run under Parallels on my 15'' MacBook Pro, but it is ultimatly failing. To get any decent frame rate I have to put all the setting to low, but even then I get weird graphical "gliches" when I play. Controlls are unresponsive and very laggy as well. I have increased the video memory to 256mb, but that doesn't seem to have helped. What else should I do to make the game playable? Mod-edit: I changed TF2 with a "random" 3D modelling software, which solves gaming related issues.

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  • Google Developer Day 2010 in Sao Paulo - Keynote (pt-BR & en)

    Google Developer Day 2010 in Sao Paulo - Keynote (pt-BR & en) Video footage from keynote presentation at Google Developer Day 2010 in Sao Paulo, Brazil. Mario Queiroz, VP Product Management, Google (pt-BR) Eric Bidelman, Developer Advocate, Google (en) Eric Tholomé, Product Management Director, Google (en) Marcelo Marzola, CEO, Predicta/BTBuckets (pt-BR) Marcelo Quintella, Product Manager, Google (pt-BR) For more information on Google Developer Day in Sao Paulo, see www.google.com Follow us on the Code blog and on Twitter: googlecode.blogspot.com http twitter.com (in pt-BR) Hashtag #gddbr From: GoogleDevelopers Views: 612 10 ratings Time: 01:11:59 More in Science & Technology

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  • DotNetNuke Boston User Group

    - by Rob Chartier
    Eric, over at the Boston DNN User Group has graciously invited me to give a presentation to his User Group on May 17th.  Come join me for an open discussion on “DotNetNuke – A look inside”.  I will cover topics like how we are adopting the Agile methodologies at a corporate level, how we are best utilizing Scrum, a sneak peek at the roadmap for 2010, and how YOU can participate with the future direction of the product. If you are currently a partner or a customer of DotNetNuke please feel free to attend and reach out, I’m sure Eric would love the extra attendance!  I would love to start putting faces to the names of so many of you.

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  • IIS 7.x Application Pool Best Practices

    - by Eric
    We are about to deploy a bunch of sites to some new servers. I have the following questions about application pools: 1) It seems advisable to have an application pool per website. Are there any caveats to this approach? Can one application pool, for example, hog all the CPU, Memory, Etc...? 2) When should you allow multiple worker processes in an application pool. When should you not? 3) Can private memory limit be used to prevent one application pool from interfering with another? Will setting it too low cause valid requests to recycle the application pool without getting a valid response? 4) What is the difference between private and virtual memory limits? 5) Are there compelling reasons NOT to run one application pool per site? Thanks!

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  • Version Control & Build Systems free Headspring on 5/18

    Headspring is putting on another free workshop at the Austin Microsoft office.  This one will be led by Senior Consultant, Eric Anderson.  Here are the details: Headspring Presents: Version Control and Build Systems for Growing Teams a workshop by Eric Anderson on: Does your team run into frequent conflicts with source control? Has your build system become a broken window with little hope of repair? Do you struggle to deploy minor changes and bug fixes while keeping the system stable?...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Developer Webinar Toay:"Publishing IPS PAckages"

    - by user13333379
    Oracle's Solaris Organization is pleased to announce a Technical Webinar for Developers on Oracle Solaris 11: "Publishing IPS Packages" By Eric Reid (Principal Software Engineer) today June 19, 2012 9:00 AM PDT This bi-weekly webinar series (every other Tuesday @ 9 a.m. PT) is designed for ISVs, IHVs, and Application Developers who want a deep-dive overview about how they can deploy Oracle Solaris 11 into their application environments. This series will provide you the unique opportunity to learn directly from Oracle Solaris ISV Engineers and will include LIVE Q&A via chat with subject matter experts from each topic area. Any OTN member can register for this free webinar here.  Today's webinar is a deep dive into IPS. The attendees of the initial IPS webinar asked for more information around this topic. Eric Reid who worked with leading software vendors (ISVs) to migrate Solaris 10 System V packages to IPS will share his experience with us. 

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  • Developer Webinar Today:"Publishing IPS Packages"

    - by user13333379
    Oracle's Solaris Organization is pleased to announce a Technical Webinar for Developers on Oracle Solaris 11: "Publishing IPS Packages" By Eric Reid (Principal Software Engineer) today June 19, 2012 9:00 AM PDT This bi-weekly webinar series (every other Tuesday @ 9 a.m. PT) is designed for ISVs, IHVs, and Application Developers who want a deep-dive overview about how they can deploy Oracle Solaris 11 into their application environments. This series will provide you the unique opportunity to learn directly from Oracle Solaris ISV Engineers and will include LIVE Q&A via chat with subject matter experts from each topic area. Any OTN member can register for this free webinar here.  Today's webinar is a deep dive into IPS. The attendees of the initial IPS webinar asked for more information around this topic. Eric Reid who worked with leading software vendors (ISVs) to migrate Solaris 10 System V packages to IPS will share his experience with us. 

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  • What Color is your Jetpack ?

    - by JoshReuben
    I’m a programmer, Im approaching 40, and I’m fairly decent at my job – I’ll keep doing what I’m doing for as long as they let me!   So what are your career options if you know how to code? A Programmer could be ..   An Algorithm developer Pros Interesting High barriers of entry, potential for startup competitive factor Cons Do you have the skill, qualifications? What are working conditions n this mystery niche ? micro-focus An Academic Pros Low pressure Job security – or is this an illusion ? Cons Low Pay Need a PhD A Software Architect Pros: strategic, rather than tactical Setting technology platform and high level vision You say how it should work, others have to figure out why its not working the way its supposed to ! broad view – you are paid to learn (how do you con people into paying for you to learn ??) Cons: Glorified developer – more often than not! competitive – everyone wants to do it ! loose touch with underlying tech in tough times, first guy to get the axe ! A Software Engineer Pros: interesting, always more to learn fun I can do it Fallback Cons: Nothing new under the sun – been there, done that Dealing with poor requirements, deadlines, other peoples code, overtime C#, XAML, Web - Low barriers of entry –> à race to the bottom A Team leader Pros: Setting code standards and proposing technology choices Cons: Glorified developer – more often than not! Inspecting other peoples code and debugging the problems they cannot fix Dealing with mugbies and prima donas Responsible for QA of others A Project Manager Pros No need for debugging other peoples code Cons Low barrier of entry High pressure Responsible for QA of others Loosing touch with technology A lot of bullshit meetings Have to be an asshole A Product Manager Pros No need for debugging other peoples code Learning new skillset of sales and marketing Cons Travel (I'm a family man) May need to know the bs details of an uninteresting product things I want to work with: AI, algorithms, Numerical Computing, Mathematica, C++ AMP – unfortunately, the work here is few & far between. VS & TFS Extensibility, DSLs (Workflow , Lightswitch), Code Generation – one day, code will write code ! Unity3D, WebGL – fun, fun, fun ! Modern Web – Knockout, SignalR, MVC, Node.Js ??? (tentative – I'll wait until things stabilize as this area is undergoing a pre-Cambrian explosion) Things I don’t want to work with: (but will if I'm asked to !) C# – same old, same old – not learning anything new here Old code – blech ! Environment with code & fix mentality , ad hoc requirements, excessive overtime Pc support, System administration – even after 20 years, people still ask you to do this sometimes ! debugging – my skills are just not there yet Oracle Old tech: VB 6, XSLT, WinForms, Net 3.51 or less Old style Web dev Information Systems: ASP.NET webforms, Reporting services / crystal reports, SQL Server CRUD with manual data layer, XAML MVVM – variations of the same concept, ad nauseaum. Low barriers of entry –> race to the bottom.  Metro – an elegant API coupled to a horrendous UX – I'll wait for market penetration viability before investing further in this.   Conclusion So if you are in a slump, take heart: Programming is a great career choice compared to every other job !

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  • Tales from the Coal Face - Speeding up a C# compilation

    - by TATWORTH
    At one place, I was faced with a C# solution which when XML documentation was turned on, the compilation time increased from 45 seconds to over 8 minutes. This slowdown was unacceptable, however some digging revealed an excellent suggestion by Eric Woodruff at http://social.msdn.microsoft.com/Forums/en-US/devdocs/thread/9bbad4cc-e229-49da-a6f7-3cdf470ac53a/ where he suggested "just suppress the warning by entering it's number (1591 for C#) in the Suppress Warnings field on the Build tab of the project properties". I followed Eric's suggestion and the compilation time went back down to 45 seconds. Now that CS1591 is suppressed how was missing documentation to be found? All that was necessary was to run StyleCop!

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  • Fast Data - Big Data's achilles heel

    - by thegreeneman
    At OOW 2013 in Mark Hurd and Thomas Kurian's keynote, they discussed Oracle's Fast Data software solution stack and discussed a number of customers deploying Oracle's Big Data / Fast Data solutions and in particular Oracle's NoSQL Database.  Since that time, there have been a large number of request seeking clarification on how the Fast Data software stack works together to deliver on the promise of real-time Big Data solutions.   Fast Data is a software solution stack that deals with one aspect of Big Data, high velocity.   The software in the Fast Data solution stack involves 3 key pieces and their integration:  Oracle Event Processing, Oracle Coherence, Oracle NoSQL Database.   All three of these technologies address a high throughput, low latency data management requirement.   Oracle Event Processing enables continuous query to filter the Big Data fire hose, enable intelligent chained events to real-time service invocation and augments the data stream to provide Big Data enrichment. Extended SQL syntax allows the definition of sliding windows of time to allow SQL statements to look for triggers on events like breach of weighted moving average on a real-time data stream.    Oracle Coherence is a distributed, grid caching solution which is used to provide very low latency access to cached data when the data is too big to fit into a single process, so it is spread around in a grid architecture to provide memory latency speed access.  It also has some special capabilities to deploy remote behavioral execution for "near data" processing.   The Oracle NoSQL Database is designed to ingest simple key-value data at a controlled throughput rate while providing data redundancy in a cluster to facilitate highly concurrent low latency reads.  For example, when large sensor networks are generating data that need to be captured while analysts are simultaneously extracting the data using range based queries for upstream analytics.  Another example might be storing cookies from user web sessions for ultra low latency user profile management, also leveraging that data using holistic MapReduce operations with your Hadoop cluster to do segmented site analysis.  Understand how NoSQL plays a critical role in Big Data capture and enrichment while simultaneously providing a low latency and scalable data management infrastructure thru clustered, always on, parallel processing in a shared nothing architecture. Learn how easily a NoSQL cluster can be deployed to provide essential services in industry specific Fast Data solutions. See these technologies work together in a demonstration highlighting the salient features of these Fast Data enabling technologies in a location based personalization service. The question then becomes how do these things work together to deliver an end to end Fast Data solution.  The answer is that while different applications will exhibit unique requirements that may drive the need for one or the other of these technologies, often when it comes to Big Data you may need to use them together.   You may have the need for the memory latencies of the Coherence cache, but just have too much data to cache, so you use a combination of Coherence and Oracle NoSQL to handle extreme speed cache overflow and retrieval.   Here is a great reference to how these two technologies are integrated and work together.  Coherence & Oracle NoSQL Database.   On the stream processing side, it is similar as with the Coherence case.  As your sliding windows get larger, holding all the data in the stream can become difficult and out of band data may need to be offloaded into persistent storage.  OEP needs an extreme speed database like Oracle NoSQL Database to help it continue to perform for the real time loop while dealing with persistent spill in the data stream.  Here is a great resource to learn more about how OEP and Oracle NoSQL Database are integrated and work together.  OEP & Oracle NoSQL Database.

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