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  • How to deal with a CEO making all technical decision but with little technical knowledge ?

    - by anonymous
    Hi, Question posted anonymously for obvious reasons. I am working in a company with a dev group of 5-6 developers, and I am in a situation which I have a hard time dealing with. Every technical choice (language, framework, database, database scheme, configuration scheme, etc...) is decided by the CEO, often without much rationale. It is very hard to modify those choices, and his main argument consists in "I don't like this", even though we propose several alternative with detailed pros/cons. He will also decide to rewrite from scratch our core product without giving a reason why, and he never participates to dev meetings because he considers it makes things slower... I am already looking at alternative job opportunities, but I was wondering if there anything we (the developers) could do to improve the situation. Two examples which shocked me: he will ask us to implement something akin to configuration management, but he reject any existing framework because they are not written in the language he likes (even though the implementation language is irrelevant). He also expects us to be able to write those systems in a couple of days, "because it is very simple". he keeps rewriting from scratch on his own our core product because the current codebase is too bad (codebase whose design was his). We are at our third rewrite in one year, each rewrite worse than the previous one. Things I have tried so far is doing elaborate benchmarks on our product (he keeps complaining that our software is too slow, and justifies rewrites to make it faster), implement solutions with existing products as working proof instead of just making pros/cons charts, etc... But still 90 % of those efforts go to the trashbox (never with any kind of rationale behind he does not like it, again), and often get reprimanded because I don't do exactly as he wants (not realizing that what he wants is impossible).

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  • Why is multithreading often preferred for improving performance?

    - by user1849534
    I have a question, it's about why programmers seems to love concurrency and multi-threaded programs in general. I'm considering 2 main approaches here: an async approach basically based on signals, or just an async approach as called by many papers and languages like the new C# 5.0 for example, and a "companion thread" that manages the policy of your pipeline a concurrent approach or multi-threading approach I will just say that I'm thinking about the hardware here and the worst case scenario, and I have tested this 2 paradigms myself, the async paradigm is a winner at the point that I don't get why people 90% of the time talk about multi-threading when they want to speed up things or make a good use of their resources. I have tested multi-threaded programs and async program on an old machine with an Intel quad-core that doesn't offer a memory controller inside the CPU, the memory is managed entirely by the motherboard, well in this case performances are horrible with a multi-threaded application, even a relatively low number of threads like 3-4-5 can be a problem, the application is unresponsive and is just slow and unpleasant. A good async approach is, on the other hand, probably not faster but it's not worst either, my application just waits for the result and doesn't hangs, it's responsive and there is a much better scaling going on. I have also discovered that a context change in the threading world it's not that cheap in real world scenario, it's in fact quite expensive especially when you have more than 2 threads that need to cycle and swap among each other to be computed. On modern CPUs the situation it's not really that different, the memory controller it's integrated but my point is that an x86 CPUs is basically a serial machine and the memory controller works the same way as with the old machine with an external memory controller on the motherboard. The context switch is still a relevant cost in my application and the fact that the memory controller it's integrated or that the newer CPU have more than 2 core it's not bargain for me. For what i have experienced the concurrent approach is good in theory but not that good in practice, with the memory model imposed by the hardware, it's hard to make a good use of this paradigm, also it introduces a lot of issues ranging from the use of my data structures to the join of multiple threads. Also both paradigms do not offer any security abut when the task or the job will be done in a certain point in time, making them really similar from a functional point of view. According to the X86 memory model, why the majority of people suggest to use concurrency with C++ and not just an async approach ? Also why not considering the worst case scenario of a computer where the context switch is probably more expensive than the computation itself ?

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  • Customizing ASP.NET MVC 2 - Metadata and Validation

    In this article, you will learn about two major extensibility points of ASP.NET MVC 2, the ModelMetadataProvider and the ModelValidatorProvider. These two APIs control how templates are rendered, as well as server-side & client side validation of your model objects.

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  • postfix-dovecot email sending works with squirrel mail but not with Thunderbird?

    - by Mark S.
    I have setup an intranet email system using postfix, dovecot and squirrel mail, Which is working fine, I can send and receive mail to all users on the system. I presume that the issue is in the postfix configuration, because when I configure Thunderbird to send mail I am getting the following error: An error occurred while sending mail. The mail server responded: 4.1.8 <[email protected]>: Sender address rejected: Domain not found. Please check the message recipient [email protected] and try again. Also here is the relevant syslog entries: NOQUEUE: reject: RCPT from host1.intranetdomain.com [More Information] [192.168.11.1 [More Information] ]: 450 4.1.8 <[email protected]>: Sender address rejected: Domain not found; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<[127.0.0.1 [More Information] ]> I have configured MX records on the DNS server and they respond appropriately when I query them for those MX records, so I do not think that is the issue. I think that my issue is caused by the default configuration of: smtpd_recipient_restrictions = reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination smtpd_sender_restrictions = reject_unknown_sender_domain Since this is on an internal network and it will not be exposed to the internet as a whole which options can I remove safely?

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  • How to add exception for backup MX to tumgreyspf?

    - by Waleed Hamra
    I have an Ubuntu raring server running postfix/dovecot as an email server, with tumgreyspf doing greylisting and SPF checks. My problem is that I also have a backup MX server, that is supposed to store my emails temporarily, should my main server ever fails. It usually rejects receiving emails if it finds the main server online and functional. The problem is when it does need to do its job, tumgreyspf rejects all emails from the backup MX with an error like this: Jun 27 16:18:13 hamra postfix/smtpd[28732]: NOQUEUE: reject: RCPT from mxbackup.mydomain.com[x.x.x.x]: 550 5.7.1 <[email protected]>: Recipient address rejected: QUEUE_ID="" SPF Reports: 'SPF fail - not authorized'; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<mxbackup.mydomain.com> any ideas?

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  • Panda Antivirus Pro 2012 and Secunia Windows Updater

    As with other offerings in the Panda Security portfolio, the core of Panda Antivirus Pro 2012's reliability comes from its innovative Collective Intelligence technology. This security model automatically analyzes, classifies, and fixes the approximately 73,000 files PandaLabs receives on a daily basis to offer users the highest protection possible against malware that is not only known, but also unknown. Best of all, the protection is provided with little impact on system performance to ensure a user-friendly experience. Speaking of user-friendly, Panda Antivirus Pro 2012 is described as the...

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  • Obscure SPUtility.SendMail Behavior When Manually Passing in Mail Headers

    - by Damon
    There are two ways to send mail in SharePoint: you can either use the mail components from the System.Net namespace, or you can send email using SharePoint's SPUtility.SendMail method.  One of the benefits of the SPUtility.SendMail method is that it uses the mail configuration from SharePoint, so you can manage settings in Central Administration instead of having to go through and modify your web.config file.  SPUtility.SendMail can get the job done, but it's defiantly not as developer friendly as the components from the System.Net namespace.  If you want to CC someone on an email, for example, you do NOT have a nice CC parameter - you have to manually add the CC mail header and pass it into the SPUtility.SendMail method.  I had to do this the other day, and ran into a really obscure issue. If you do NOT pass the headers into the method then SharePoint sends the email using the From Address configured in the Outgoing Mail settings in Central Admin.  If you pass headers into the method, but do not include the from header, then SharePoint sends the mail using the email address of the current user. This can be an issue if your mail server is setup to reject an email from an invalid email address or an email address that is not on your domain.  The way to fix this issue is to always pass in the from header.  If you want to use the configured From address, then you can do the following: SPWebApplication webApp = SPWebApplication.Lookup(new Uri(SPContext.Current.Site.Url)); StringDictionary headers = new StringDictionary(); headers.Add("from", webApp.OutboundMailSenderAddress);

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  • Headaches using distributed version control for traditional teams?

    - by J Cooper
    Though I use and like DVCS for my personal projects, and can totally see how it makes managing contributions to your project from others easier (e.g. your typical Github scenario), it seems like for a "traditional" team there could be some problems over the centralized approach employed by solutions like TFS, Perforce, etc. (By "traditional" I mean a team of developers in an office working on one project that no one person "owns", with potentially everyone touching the same code.) A couple of these problems I've foreseen on my own, but please chime in with other considerations. In a traditional system, when you try to check your change in to the server, if someone else has previously checked in a conflicting change then you are forced to merge before you can check yours in. In the DVCS model, each developer checks in their changes locally and at some point pushes to some other repo. That repo then has a branch of that file that 2 people changed. It seems that now someone must be put in charge of dealing with that situation. A designated person on the team might not have sufficient knowledge of the entire codebase to be able to handle merging all conflicts. So now an extra step has been added where someone has to approach one of those developers, tell him to pull and do the merge and then push again (or you have to build an infrastructure that automates that task). Furthermore, since DVCS tends to make working locally so convenient, it is probable that developers could accumulate a few changes in their local repos before pushing, making such conflicts more common and more complicated. Obviously if everyone on the team only works on different areas of the code, this isn't an issue. But I'm curious about the case where everyone is working on the same code. It seems like the centralized model forces conflicts to be dealt with quickly and frequently, minimizing the need to do large, painful merges or have anyone "police" the main repo. So for those of you who do use a DVCS with your team in your office, how do you handle such cases? Do you find your daily (or more likely, weekly) workflow affected negatively? Are there any other considerations I should be aware of before recommending a DVCS at my workplace?

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  • Many-to-many relationships in pharmacology

    - by John Paul Cook
    When I was in my pharmacology class this morning, I realized that the instructor was presenting a classic relational database management system problem: the many-to-many relationship. He said that all of us in nursing school must know our drugs backwards and forwards. I know how to model that! There are so many things in both healthcare and higher education that could benefit from an appropriate application of technology. As a student, I'd like to be able to start with a drug, a disease, a name of...(read more)

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  • Next Best Action: an emerging engagement paradigm can elevate customer experience to the next level

    - by Richard Lefebvre
    As customer interactions increase across an expanding number of communication channels, business leaders are struggling to understand and engage with each customer effectively. To address this challenge, leading organizations are adopting strategies around “next best action,” a decision-support model that systematically identifies the next best step to take in the customer conversation—whether that action is providing additional information or targeted services, presenting a unique offer, or taking no action at all... Read the complete article - by Mark A. Stevens (vice president, Insight and Customer Strategy, at Oracle) - here

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  • Forcing the from address when postfix relays over smtp

    - by John Whitlock
    I'm trying to get email reports from our AWS EC2 instances. We're using Exchange Online (part of Microsoft Online Services). I've setup a user account specifically for SMTP relaying, and I've setup Postfix to meet all the requirements to relay messages through this server. However, Exchange Online's SMTP server will reject messages unless the From address exactly matches the authentication address (the error message is 550 5.7.1 Client does not have permissions to send as this sender). With careful configuration, I can setup my services to send as this user. But I'm not a huge fan of being careful - I'd rather have postfix force the issue. Is there a way to do this?

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  • Postfix/dovecot remove LDAP user

    - by dove221
    I have to remove or blacklist an LDAP/dovecot user. The authentication is setup from active directory what I cannot manage so I thought there should be a way at least to disable this specific user on the mailserver locally. # Virtual Accoutns - LDAP - MS AD virtual_mailbox_maps = ldap:/etc/postfix/ldap_mailbox_maps.cf virtual_alias_maps = ldap:/etc/postfix/ldap_alias_maps_redirect_true.cf ldap:/etc/postfix/ldap_alias_maps_redirect_false.cf ldap:/etc/postfix/ldap_mailbox _groups.cf virtual_mailbox_domains = domain.com virtual_uid_maps = static:1000 virtual_gid_maps = static:1000 virtual_transport = dovecot dovecot_destination_recipient_limit = 1 Anybody knows how to do it? I followed this guide for disabling 1 user through postfixes access file: http://www.cyberciti.biz/faq/howto-blacklist-reject-sender-email-address/ Unfortunately it doesn't work. It's like the settings stored in LDAP are overruling the access rule. Instead of postfix rejecting the mail it keeps accepting it. Thanks!

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  • IPtables rate-limit, What are the differences between modules? Recent, Limit

    - by TechZilla
    I am doing some rate-limiting with IPtables, and i'm not sure if I should use "Recent" or "Limit" What are the differences between the two? If they both achieve the same result, which one has better performance? I would like to know, regardless if any difference would be perceivable. I am looking to ACCEPT if under limit, and REJECT if over. I'm not interested in thus bandwidth throttling, I don't want a queue. I don't need any syntax examples, both have ample use examples online. I have also used Limit in the past. I appreciate any responses.

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  • PASS: SQLRally Thoughts

    - by Bill Graziano
    The PASS Board recently decided that we wouldn’t put another US-based SQLRally on the calendar until we had a chance to review the program. I wanted to provide some of my thinking around this. Keep in mind that this is the opinion of one Board member. The Board committed to complete two SQLRally events to determine if an event modeled between SQL Saturday and the Summit was viable. We’ve completed the two events and now it’s time to step back and review the program. This is my seventh year on the PASS Board. Over that time people have asked me why PASS does certain things. Many, many times my answer has been “Because that’s the way we did it last year”. And I am tired of giving that answer. We need to take a step back and review the US-based SQLRally before we schedule another one. It would be irresponsible for me as a Board member to commit resources to this without validating that what we’re doing makes sense for the organization and our members. I have no doubt that this was a great event for the attendees. We just need to validate it’s the best use of our resources. Please keep in mind that we haven’t cancelled the event. We’ve just said we need to review it before scheduling another one. My opinion is that some fairly serious changes are needed to the model before we consider it again – IF we do it again. I’ve come to that conclusion after speaking with the Dallas organizers, our HQ team, our Marketing team, other Board members (including one of the Orlando organizers), attendees in Orlando and Dallas and visiting other similar events. I should point out that their views aren’t unanimous on nearly any part of this event -- which is one of the reasons I want to take some time and think about this before continuing. I think it’s helpful to look at the original goals of what we were trying to accomplish. Andy Warren wrote these up in August of 2010. My summary of these goals and some thoughts on each one is below. Many of these thoughts revolve around the growth of SQL Saturdays. In the two years since that document was written these events have grown significantly. The largest SQL Saturdays are now over 500 people which mean they are nearly the same size as our recent SQLRally. Our goals included: Geographic diversity. We wanted an event in an area of the country that was away from any given Summit location. I think that’s still a valid goal. But we also have SQL Saturdays all over the country. What does SQLRally bring to this that SQLSaturday doesn’t? Speaker growth. One of the stated goals was to build a “farm club” for speakers. This gives us a way for speakers to work up to speaking at Summit by speaking in front of larger crowds. What does SQLRally bring to this that the larger SQL Saturdays aren’t providing? Pre-Conference speakers is one obvious answer here. Lower price. On a per-day basis, SQLRally is roughly 1/4th the price of the Summit. We wanted a way for people to experience something Summit-like at a lower price point. The challenge is that we are very budget constrained at that lower price point. International Event Model.  (I need to write more about this but I’m out of time.  I’ll cover it in the next installment.) There are a number of things I really like about SQLRally. I love the smaller conferences. They give me a chance to meet more people than at something the size of Summit. I like the two day format. That gives you two evenings to be at social events with people. Seeing someone a second day is a great way to build a bond with that person. That’s more difficult to do at a SQL Saturday. We also need to talk about the financial aspects of the event. Last year generated a small $17,000 profit on revenues of $200,000. Percentage-wise that’s reasonable but on an absolute basis it’s not a huge amount in our budget. We think this year will lose between $30,000 and $50,000 and take roughly 1,000 hours of HQ time. We don’t have detailed financials back yet but that’s our best guess at this point. Part of that was driven by using a convention center instead of a hotel. Until we get detailed financials back we won’t have the full picture around the financial impact. This event also takes time and mindshare from our Marketing team. This may sound like a small thing but please don’t underestimate it. Our original vision for this was something that would take very little time from our Marketing team and just a few mentions in the Connector. It turned out to need more than that. And all those mentions and emails take up space we could use to talk about other events and other programs. Last I wanted to talk about some of the things I’m thinking about. I don’t think it’s as simple as saying if we just fix “X” it all gets better. Is this that much better of an event than SQL Saturdays? What if we gave a few SQL Saturdays some extra resources? When SQL Saturdays were around 250 people that wasn’t as viable. With some of those events over 500 we need to reconsider this. We need to get back to a hotel venue. That will help with cost and networking. Is this the best use of the 1,000 HQ hours that we invested in the event? Is our price-point correct? I’m leaning toward raising our price closer to Summit on a per-day basis. I think this will let us put on a higher quality event and alleviate much of the budget pressure. Should growing speakers be a focus? Having top-line pre-conference speakers helps market the event. It will also have an impact on pricing and overall profit. We should also ask if it actually does grow speakers. How many of these people will eventually register for Summit? Attend chapters? Is SQLRally a driver into PASS or is it something that chapters, etc. drive people to? Should we have one paid day and one free instead of two paid days? This is a very interesting model that is used by SQLBits in the UK. This gives you the two day aspect as well as offering options for paid and free attendees. I’m very intrigued by this. Should we focus on a topic? Buried in the minutes is a discussion of whether PASS should have a Business Analytics conference separate from Summit. This is an interesting question to consider. Would making SQLRally be focused on a particular topic make it more attractive? Would that even be a SQLRally? Can PASS effectively manage the two events? (FYI - Probably not.) Would it help differentiate it from Summit and SQL Saturday? These are all questions that I think should be asked and answered before we do this event again. And we can’t do that if we don’t take time to have the discussion. I wanted to get this published before I take off for a few days of vacation. When I get back I’d like to write more about why the international events are different and talk about where we go from here.

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  • sshd: How to enable PAM authentication for specific users under

    - by Brad
    I am using sshd, and allow logins with public key authentication. I want to allow select users to log in with a PAM two-factor authentication module. Is there any way I can allow PAM two-factor authentication for a specifc user? I don't want users - By the same token - I only want to enable password authentication for specific accounts. I want my SSH daemon to reject the password authentication attempts to thwart would-be hackers into thinking that I will not accept password authentication - except for the case in which someone knows my heavily guarded secret account, which is password enabled. I want to do this for cases in which my SSH clients will not let me do either secret key, or two-factor authentication.

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  • Are UML class diagrams adequated to design javascript systems?

    - by Vandell
    Given that UML is oriented towards a more classic approach to object orientation, is it still usable in a reliable way to design javascript systems? One specific problem that I can see is that class diagrams are, in fact, a structural view of the system, and javascript is more behaviour driven, how can you deal with it? Please, keep in mind that I'm not talking abot the real world domain here, It's a model for the solution that I'm trying to achieve.

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  • PowerPivot, Stocks Exchange and the Moving Average

    - by AlbertoFerrari
    In this post I want to analyze a data model that perform some basic computations over stocks and uses one of the most commonly needed formula there (and in many other business scenarios): a moving average over a specified period in time. Moving averages can be very easily modeled in PowerPivot, but there is the need for some care and, in this post, I try to provide a solid background on how to compute moving averages. In general, a moving average over period T1..T2 is the average of all the values...(read more)

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  • Animate multiple entities

    - by Robert
    I'm trying to animate multiple(3) entities using one model(IQM format). It's working but performance is really bad because I'm calling animate function for each entity in my game loop (I think problem is there). What's the best way to animate multiple entities (with different animation ofc) in OpenGL? I think I can try build one VBO / entity for better performances but I don't think it's the best way to do it.

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  • What is the canonical resource on multi-tenancy web applications using ruby + rails

    - by AlexC
    What is the canonical resource on multi-tenancy web applications using ruby + rails. There are a number of ways to develop rails apps using cloud capabilities with real elastic properties but there seems to be a lack of clarity with how to achieve multitenancy, specifically at the model / data level. Is there a canonical resource on options to developing multitenancy rails applications with the required characteristics of data seperation, security, concurrency and contention required by an enterprise level cloud application.

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