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• Tomcat / Railo stop responding with no error output

  - by andrewdixon

  This is going to sound very vague and I'm sure it will be voted down for not giving enough information however I don't really have any to give as you will see. We have an AWS instance running Amazon Linux, Apache, Tomcat and Railo and from time to time the Tomcat/Railo simply stops responding to requests and there are no errors output in the catalina.out file or any of the other log files in the Tomcat logs directory. When I issue the command to restart Tomcat/Railo the restart scripts sits there for a while then says that Tomcat has not responded so it has killed it off and then it starts up again and everything is fine until it happens again, anything from a couple of minutes to a couple of days later. I have done my best to check other logs on the server but have found no messages at all to indicate why Tomcat/Railo has given up and stopped responding. Can anyone suggest any reason why it might be doing this and / or any other log file(s) that we could check to see what is happening. Thanks. Andrew.

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• Dealing with Fine-Grained Cache Entries in Coherence

  - by jpurdy

  On occasion we have seen significant memory overhead when using very small cache entries. Consider the case where there is a small key (say a synthetic key stored in a long) and a small value (perhaps a number or short string). With most backing maps, each cache entry will require an instance of Map.Entry, and in the case of a LocalCache backing map (used for expiry and eviction), there is additional metadata stored (such as last access time). Given the size of this data (usually a few dozen bytes) and the granularity of Java memory allocation (often a minimum of 32 bytes per object, depending on the specific JVM implementation), it is easily possible to end up with the case where the cache entry appears to be a couple dozen bytes but ends up occupying several hundred bytes of actual heap, resulting in anywhere from a 5x to 10x increase in stated memory requirements. In most cases, this increase applies to only a few small NamedCaches, and is inconsequential -- but in some cases it might apply to one or more very large NamedCaches, in which case it may dominate memory sizing calculations. Ultimately, the requirement is to avoid the per-entry overhead, which can be done either at the application level by grouping multiple logical entries into single cache entries, or at the backing map level, again by combining multiple entries into a smaller number of larger heap objects. At the application level, it may be possible to combine objects based on parent-child or sibling relationships (basically the same requirements that would apply to using partition affinity). If there is no natural relationship, it may still be possible to combine objects, effectively using a Coherence NamedCache as a "map of maps". This forces the application to first find a collection of objects (by performing a partial hash) and then to look within that collection for the desired object. This is most naturally implemented as a collection of entry processors to avoid pulling unnecessary data back to the client (and also to encapsulate that logic within a service layer). At the backing map level, the NIO storage option keeps keys on heap, and so has limited benefit for this situation. The Elastic Data features of Coherence naturally combine entries into larger heap objects, with the caveat that only data -- and not indexes -- can be stored in Elastic Data.

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• How to quickly save what is currently shown in cmd.exe to a file

  - by Zeiga

  I am asking if there is a quick way/command to save the current standard output from cmd.exe or powershell to a file. For example, I have run a bunch of commands in cmd.exe which generating like hundreds of lines of standard output. Ideally, I am looking for a single command to do "select all" and save to a file automatically. Note: I've read this. But I don't want to change my original commands, so "" or "" redirection cannot be used in this scenario. Thanks.

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• How can I read a portion of one Minecraft world file and write it into another?

  - by RapierMother

  I'm looking to read block data from one Minecraft world and write the data into certain places in another. I have a Minecraft world, let's say "TemplateWorld", and a 2D list of Point objects. I'm developing an application that should use the x and y values of these Points as x and z reference coordinates from which to read constant-sized areas of blocks from the TemplateWorld. It should then write these blocks into another Minecraft world at constant y coordinates, with x & z coordinates determined based on each Point's index in the 2D list. The issue is that, while I've found a decent amount of information online regarding Minecraft world formats, I haven't found what I really need: more of a breakdown by hex address of where/what everything is. For example, I could have the TemplateWorld actually be a .schematic file rather than a world; I just need to be able to read the bytes of the file, know that the actual block data starts always at a certain address (or after a certain instance of FF, etc.), and how it's stored. Once I know that, it's easy as pie to just read the bytes and store them.

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• SSH reverse tunnel to monitor and manage remote devices

  - by acid_crucifix

  I have a set a distributed set of devices running Ubuntu 12.04 that I am distributing to clients. I would like to manage them remotely. They may not have fixed IPs and potentially might be behind firewalls. What I am planning to do is have the devices (permanently connected to the net) poll a request URL and based on the response open a reverse tunnel to my server, so that I can access them via that tunnel. Most of what I read about reverse tunnel over SSH is for single use cases and very little about heavy production usage. Is there some reason for this, security issues? or stability? Any help would be much obliged.

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• Clustering Strings on the basis of Common Substrings

  - by pk188

  I have around 10000+ strings and have to identify and group all the strings which looks similar(I base the similarity on the number of common words between any two give strings). The more number of common words, more similar the strings would be. For instance: How to make another layer from an existing layer Unable to edit data on the network drive Existing layers in the desktop Assistance with network drive In this case, the strings 1 and 3 are similar with common words Existing, Layer and 2 and 4 are similar with common words Network Drive(eliminating stop word) The steps I'm following are: Iterate through the data set Do a row by row comparison Find the common words between the strings Form a cluster where number of common words is greater than or equal to 2(eliminating stop words) If number of common words<2, put the string in a new cluster. Assign the rows either to the existing clusters or form a new one depending upon the common words Continue until all the strings are processed I am implementing the project in C#, and have got till step 3. However, I'm not sure how to proceed with the clustering. I have researched a lot about string clustering but could not find any solution that fits my problem. Your inputs would be highly appreciated.

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• XNA - 2D Rotation of an object to a selected direction

  - by lobsterhat

  I'm trying to figure out the best way of rotating an object towards the directional input of the user. I'm attempting to mimic making turns on ice skates. For instance, if the player is moving right and the input is down and left, the player should start rotating to the right a set amount each tick. I'll calculate a new vector based on current velocity and rotation and apply that to the current velocity. That should give me nice arcing turns, correct? At the moment I've got eight if/else statements for each key combination which in turn check the current rotation: // Rotate to 225 if (keyboardState.IsKeyDown(Keys.Up) && keyboardState.IsKeyDown(Keys.Left)) { // Rotate right if (rotation >= 45 || rotation < 225) { rotation += ROTATION_PER_TICK; } // Rotate left else if (rotation < 45 || rotation > 225) { rotation -= ROTATION_PER_TICK; } } This seems like a sloppy way to do this and eventually, I'll need to do this check about 10 times a tick. Any help toward a more efficient solution is appreciated.

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• Memory allocation strategy for the vertex buffers (DirectX 10/11)

  - by Alex

  I have the following question. I write CAD system. So I have a 3D scene and there are many different objects (walls, doors, windows and so on). User can add or delete some objects. The question is: how can I organise the keeping of vertices for all my objects. I can create vertex buffer for every object. But I think drawing/switching from one buffer to another would have performance penalty. Another way - I can create several big buffers for every object type. But I don't understand how to update such buffers. It is too big to update whole buffer (for example buffer for all walls). What I need to do if I want to delete the object from the middle of the buffer? Actually I have the similar question: http://stackoverflow.com/questions/5515700/how-to-properly-update-vertex-buffers-in-directx-10 Most examples I've found work with very static models. Therefore, they tend to create a single vertex buffer with their list of points, and then are just manipulated by matrix transformations. I, on the other hand, will be updating the scene very often.

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• Windows DFS Limitations

  - by Phil

  So far I have seen an article on performance and scalability mainly focusing on how long it takes to add new links. But is there any information about limitations regarding number of files, number of folders, total size, etc? Right now I have a single file server with millions of JPGs (approx 45 TB worth) that are shared on the network through several standard file shares. I plan to create a DFS namespace and replicate all these images to another server for high availability purposes. Will I encounter extra problems with DFS that I'm otherwise not experiencing with plain-jane file shares? Is there a more recommended way to replicate these millions of files and make them available on the network? EDIT: I would experiment on my own and write a blog post about it, but I don't have the hardware for the second server yet. I'd like to collect information before buying 45 TB of hard drive space...

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• Lustre - is this bad form?

  - by ethrbunny

  Im going to be consolidating several 'server rooms' into a single installation soon. Part of this effort will be finding a home for 5Tb (and growing) of files / logs. To this end Im looking at Lustre and appreciating its ability to scale. The big vendors want to sell me a $20K SAN to manage this but Im wondering about buying several iSCSI units (like this http://www.asacomputers.com/3U-iSCSI-Solution.html) and using VMs for the OSS machines. This would let me fail-over to cover problems and not require a dedicated system for each OSS. Given articles like this (http://h30565.www3.hp.com/t5/Feature-Articles/RAID-Is-Dead-Long-Live-RAID/ba-p/1422) that talk about how RAID is not keeping up with drive density Im leaning towards more disks with lower capacity each. Again - some akin to the iSCSI array above. Tell me why this is a terrible idea. Do I really need to invest in a PE710 for each OSS/OST?

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• Private Git repo using Smart HTTP with LDAP authentification

  - by ALOToverflow

  I've been crawling the interwebz and getting my hands dirty for the last few days, but I can't seem to make it all work together. I managed to get a HTTP repo working with Ubuntu 10.04 over Smart HTTP (pull and push over HTTP) for a single repo. This means that I do the initial setup over SSH to the server (git init --bare) and after that the clients can pull and push to it (git clone http://servername/allgitrepos/repo.git). Unfortunately it's impossible to add a new repo without SSHing to the server and adding it manually) i.e. git push http://servername/allgitrepos/repo2.git (allgitrepos is available for everyone to read-write and execute) would fail talking about git update-server-info (which seems to be a general error message). So far the repository is anonymous, so I would like to authenticate using LDAP and also use the LDAP creds to make the git commit. So, how can I push new repos to the server and how can I use the LDAP creds to make the git commit. Thanks

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• Can we save image slices in sub folders in Photoshop?

  - by bobo

  I am using Photoshop CS5, by default, Photoshop saves image slices in a folder named images. This is fine but there are lots of images, saving them all in a single folder becomes quite messy. What I would like to do in Photoshop is, it allows me to specify which sub-folder a slice should go under the default images folder. For example, a website template PSD file, I would like to save image slices that appear in the header under images\header\. Maybe for the images in the footer, they should go images\footer\. Of course, I can group them manually after the slices are extracted. If possible, I would like to define them in Photoshop, so that every time the image slices are extracted, they each go to the specified sub-folder automatically. Is this possible in Photoshop?

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• Where did the notion of "one return only" come from?

  - by FredOverflow

  I often talk to Java programmers who say "Don't put multiple return statements in the same method." When I ask them to tell me the reasons why, all I get is "The coding standard says so." or "It's confusing." When they show me solutions with a single return statement, the code looks uglier to me. For example: if (blablabla) return 42; else return 97; "This is ugly, you have to use a local variable!" int result; if (blablabla) result = 42; else result = 97; return result; How does this 50% code bloat make the program any easier to understand? Personally, I find it harder, because the state space has just increased by another variable that could easily have been prevented. Of course, normally I would just write: return (blablabla) ? 42 : 97; But the conditional operator gets even less love among Java programmers. "It's incomprehensible!" Where did this notion of "one return only" come from, and why do people adhere to it rigidly?

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• Best way to lay-out the website when sections of it are almost identical

  - by Linas

  so, I have a minisite for the mobile application that I did. The mobile application is a public transport (transit) schedule viewer for a particular city (let's call it Foo), and I'm trying to sell it via that minisite. I publish that minisite in www.myawesomeapplication.com/foo/. It has the usual "standard" subpages, like "About", "Compatible phones", "Contact", etc. Now, I have decided to create analogue mobile application for other cities, Bar and Baz. These mobile applications (products) would be almost identical to the one for the Foo city, thus the minisites for those would (should) look very similar too (except for some artwork and Foo = Bar replacement). The question is: what do you think would be the most logical way to lay-out the website in this situation, both from the business and search engine perspective? In other words, should I just duplicate the /foo/ website to /bar/ and /baz/, or would it be better to try to create a single website under root path (/)? I don't want search engine penalties for almost-duplicate information under /foo/, /bar/ and /baz/, and also I don't want a messy, non-localized website (I guess the user is more likely to buy something if he/she sees "This-and-that is the application for NYC, the city you live in", not "This-and-that is the application for city A, city B, ..., NYC, ..., and city Z.")

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• How to create shared home directories across multiple computers?

  - by Joe D

  I know there are ways to share a folder across computers making it easy to move files. But I was wondering how one would setup a single login which lets you access the same files regardless of which machine you login on? What I would like is something similar to something you would see in a college campus where students login on machines in the lab and see their files regardless of which machine they use. I know there are server involved here. I have a need to create this on a smaller scale where we have a few computers available (and one of these could act as the server if needed and host the files) that every one shares. Note, the specific install of software might be different on each computer but the login and OS are the same. Since some computers have additional capability that our group members will need to use at rotating schedules (software licenses or hardware components, etc.). I have not done this before, so I would appreciate detailed instructions if possible or a reference to a guide that describes this. Thanks in advance.

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• How to correctly handle redirect after site facelift

  - by Stefan

  I recently updated our site taking it from a multi-page site to a single page site. The problem now is that when the site is searched in say Google, it displays the site as well as the indexed pages. So if a user clicks say our "About" page, it takes them to our now outdated material. I am hoping to get some guidance on how to properly handle this. I figure the first step is to now setup a robots.txt on our new index page to tell the engines not to crawl beyond index.php. But in the meantime, how do I handle the fact that when searching our site on Google we may still have users who try to click on sub-page links? Should I simply setup redirects while waiting for the engines to update? And if so, do I need to setup redirects on each page using PHP or is this something I would take care of on our sites control panel? I am not very familiar with redirects... Any help is appreciated!

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• Commit charge peak higher than system limit

  - by Grubsnik

  We are seeing some very strange behaviour on our servers and google didn't turn up anything usefull, so I'm tossing it out here. A standard server is configured with 4GB Ram, 2 4GB pagefiles and running windows server 2003. The servers are running 50-120 vb6/.net applications which normally consume no more than 100mb of memory, but will occasionally run up to 300 mb. The issue with a single process spending way too much memory is being traced down somewhere else, but the thing that is baffling us is that the reported peak charge is vastly higher than what we have available. As the image above shows, we are getting reported peaks that are way higher than what the system is actually capable of delivering. This number has been seen as high as 29GB, which makes no sense at all for a system with a limit of 12GB. Does anyone have an idea what is going on?

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• Grub2 won't detect Ubuntu 11.10 OS after reinstalling Win XP hal.dll.

  - by yoopian

  Hi I'm an Ubuntu newbie here. I've installed ubuntu 11.10 to dual boot on a single HDD. I did a manual partition and basically forgot all the on what sda my /boot partition is. My installation worked out just fine and I tried to install updates with it. After a while I when I wanted to boot to windows it showed that I was missing a "hal.dll" file. I've fixed this problem using the windows resource CD but then after booting up my PC it went straight to Windows XP. I've tried to manually reinstall Grub2 using a Live CD/USB and it worked but I think I have installed in on a different "sda#" (sda5 to be exact) because even though Grub2 loads when I boot my PC, only windows XP shows up as my OS and Ubuntu 11.10 is missing. Now, I've tried installing boot-repair to solve my problems using Live CD/USB. Boot-repair tells me that boot configuration was successful but then a basic grub interface shows up (the black one with a command line grub showing up. Now I can't even boot to Windows XP. Any help would be really appreciated. BTW here's the notes from boot repair that I was asked to save: http://paste.ubuntu.com/890228/ As you can see there are boot files on sda5 and sda7. I think that's the core problem that I have right now. Thanks in advance!

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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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• How do I share a PHP 5.4 server between OS X and VMWare?

  - by Ben

  I'm running PHP 5.4 on OS X which allows me to set up a virtual server for any directory, using this Terminal command: php -S localhost:8000 This will then set up http://localhost:8000 which works great, but what I would like to do is share this server with the instance of Windows that I have running through VMWare in order to test in Internet Explorer. I was wondering if this is possible and if it is, how do I go about setting it up? Currently trying to visit http://localhost:8000 gives me 'This page cannot be displayed'. I'd really appreciate any help that you can give me on this as I don't have much experience with virtual machines/networking. Thanks in advance.

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• New SPC2 benchmark- The 7420 KILLS it !!!

  - by user12620172

  This is pretty sweet. The new SPC2 benchmark came out last week, and the 7420 not only came in 2nd of ALL speed scores, but came in #1 for price per MBPS. Check out this table. The 7420 score of 10,704 makes it really fast, but that's not the best part. The price one would have to pay in order to beat it is ridiculous. You can go see for yourself at http://www.storageperformance.org/results/benchmark_results_spc2The only system on the whole page that beats it was over twice the price per MBPS. Very sweet for Oracle. So let's see, the 7420 is the fastest per $. The 7420 is the cheapest per MBPS. The 7420 has incredible, built-in features, management services, analytics, and protocols. It's extremely stable and as a cluster has no single point of failure. It won the Storage Magazine award for best NAS system this year. So how long will it be before it's the number 1 NAS system in the market? What are the biggest hurdles still stopping the widespread adoption of the ZFSSA? From what I see, it's three things: 1. Administrator's comfort level with older legacy systems. 2. Politics 3. Past issues with Oracle Support.   I see all of these issues crop up regularly. Number 1 just takes time and education. Number 3 takes time with our new, better, and growing support team. many of them came from Oracle and there were growing pains when they went from a straight software-model to having to also support hardware. Number 2 is tricky, but it's the job of the sales teams to break through the internal politics and help their clients see the value in oracle hardware systems. Benchmarks like this will help.

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• Need help upgrading MacBookPro3,1 RAM to 4GB.

  - by Fantomas

  My questions are: 1) Where to buy it and what to buy? I have heard that this RAM is generic enough and it does not have to come from Apple. 2) Can I reuse my existing stick(s)? Would I have a single 2GB module, or 2 x 1GB modules? 3) If I have 2GB already, is it a good idea to have one old stick and one new one? Which one is better placed at the top and which one at the bottom? Let me know what questions you have. My computer's info: Hardware Overview: Model Name: MacBook Pro Model Identifier: MacBookPro3,1 Processor Name: Intel Core 2 Duo Processor Speed: 2.4 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 4 MB Memory: 2 GB Bus Speed: 800 MHz Boot ROM Version: MBP31.0070.B07 SMC Version (system): 1.16f11

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• Moving away from PHP and running towards server-side JavaScript [on hold]

  - by Sosukodo

  I've decided to start moving away from PHP and server-side JavaScript looks like an attractive replacement. However, I'm having a hard time wrapping my head around how others are using Node.js for web applications. I'm currently using Lighttpd with FastCGI PHP. The one thing I like about PHP is that I can "inline" my scripts in the document like so: <?php echo 'Hello, World!'; ?> My question is: Is there any server-side JavaScript solution that I can use in this manor? For instance, I'd love to be able to do this: <?js print('Hello, World!'); ?> Is there such a thing? I'm not looking for opinions about "which is better". I just want to know what's out there and I'll explore each of them on my own. The important thing is that I'd like to use it like I demonstrated above. Links to the software along with implementation examples will be considered above other answers.

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• What is the best IP/Subnet set up strategy for a multi-server webhosting setup?

  - by Roy Andre

  Sorry for the mixed-up title, but let me try to explain better: We run a hosting solution, which until now has supported shared hosting and VPSes. Easy enough. We are now getting larger clients which require a more complex setup. We have more or less settled the server-setup itself, which will consist of: 1-2 Frontend Proxy/Load balancing servers 2+ Application servers 1 Database server 1 optional Memcached server The issue we are dealing with is to agree on a flexible and easy-to-maintain IP setup. So far we've been into VLAN'ing the internal servers in its own subnet, we've though of assigning an official IP to each server, and so on. What will be the best approach here? Any best practices? Using one official IP on the Frontend server, and then just set up an internal subnet for the servers behind that? We could then just NAT in any eventual sources required to access for instance the DB server directly over 3306.

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• Setting up an SVN repository on a windows server to work with XCode.

  - by Tejaswi Yerukalapudi

  Hi, I need to setup an SVN repository for an iPhone / iPad app that I'm working on. It needs to be setup on a Windows server 2003 instance. We run VSS on it, but it doesn't really work all that well with XCode, so I'd like to migrate ASAP. The problem is, I'm a new graduate and this is the first time I'll be using a souce control software, so any tutorials on how to set one up, configure it to work correctly with Macs using XCode are greatly appreciated! Though it's not a priority, I'd also like to try to get my company to ditch VSS for SVN (Been reading this article yesterday - http://www.codinghorror.com/blog/2006/08/source-control-anything-but-sourcesafe.html). How hard is it to migrate existing builds in VSS into something like SVN? Thanks, Teja

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