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  • Should I have a heroku worker dyno for poll a AWS SQS?

    - by Luccas
    Im confusing about where should I have a script polling an Aws Sqs inside a Rails application. If I use a thread inside the web app probably it will use cpu cycles to listen this queue forever and then affecting performance. And if I reserve a single heroku worker dyno it costs $34.50 per month. It makes sense to pay this price for it for a single queue poll? Or it's not the case to use a worker for it? The script code: queue = AWS::SQS::Queue.new(SQSADDR['my_queue']) queue.poll(:idle_timeout => 20) do |msg| # code here end I need help!! Thanks

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  • Nginx Static Content Server Maxing Out?

    - by Harry
    I use nginx to serve the static content for a decently busy website of mine. I have the logging disabled, and 4 worker processes enabled with 5,000 connections per worker (which should yield a max connection limit of 20,000. The server is only operating at about 10% CPU usage and 50% ram, but it's very laggy, and sometimes nginx is so slow to respond to the requests, it times out. For a small number of connections, it's fine, but once any load starts occurring (~2,500 connections), it backs up and bogs down. Is there any other bottlenecks or limits that I might be hitting? This is a FreeBSD server, and all the static files are located locally (not NFS). The NIC is an unmetered gigabit, and it's only using around 75 megabit. Any insight would be appreciated. Thanks.

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  • Calculating IOPS for a single HDD - what am I doing wrong?

    - by red888
    So I know there is no standardized way of calculating IOPS for a HDD, but from everything I have read it appears one of the most accurate formulas is the following: IOP/ms = + {rotational latency} + ({block size} / {data transfer rate}) Which is IOs per millisecond or what the book I've been reading calls "Disk Service Time". Also rotational latency is calculated as half of one rotation in milliseconds. This was taken from the EMC book "Information Storage and Management" -arguably a pretty reliable source right\wrong? Putting this formula into practice consider this Seagate data sheet. I am going to calculate IOPS for the ST3000DM001 model for a block size of 4kb: Seek Average (Write) = 9.5 -I'll measuring IOPS for writes Spindle speed = 7200rpm Average Data Rate = 156MB/s So my variables are: Seek Time = 9.5ms Rotational latency = (.5 / (7200rpm / 60)) = 0.004s = 4ms Data Rate = 156MB/s = (0.156MB/ms / 0.004MB) = 39 9.5ms + 4ms + 39 = IO/ms 52.5 1 / (52.5 * 0.001) = 19 IOPS 19 IOPS for this drive clearly is not right so what am I doing wrong?

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  • Any program or editor in windows 7 to run ".md" files

    - by Anmol Saraf
    I understand that '.md' is an extension for markdown format. While installing 'Grunt' from GitHub I see a lot of .md extension files inside node_module/grunt/docs folder. As per my understanding these files are supported by GitHub for documentation kind of things if I am not wrong. My question here is - Are there any editors/tools or programs available for Windows 7 where I can see these .md files executing ? When I try to open any of these file inside my text editor it displays in raw format with all '#" etc. keywords. I want to see the formatted version of these files so that without an internet connection also I can navigate the documentation on my machine. Thanks for helping !!

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  • Brand new Lenovo u410 heats up around touchpad

    - by Ali
    My Lenovo u410 started heating around the right palm rest minutes after I unpacked it! I am devastated, because I bought this for programming, and it's impossible to type on this for extended periods with the surface getting so hot. I haven't run any serious programs on it yet, so the processor has been pretty much idle. I've been Googling this problem, and found only one person who had this issue too. Is this is a defect in the product? Why aren't many others getting this problem? I bought it via newegg.com and as per their policy you can't return a product once you've opened it. Specs: Core i5, 6 GB RAM, 750 GB harddisk. Running Windows 8.

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  • Modify HTML Content with Squid

    - by user38400
    We have setup our network as per the tutorial here: https://help.ubuntu.com/community/Upside-Down-TernetHowTo. Basically, we have a squid proxy that inverts images for pages that clients request. We're trying to modify the script so that we can edit the contents of the webpage before the webpage is sent to the client. We are not having any luck. I'm wondering if there is something different about .html files that makes this not possible. What is happening is that we do a wget on the URI that is requested, save it locally, modify it and then echo back the new URI. The page that the user gets is the unmodified page and not the one that we just changed.

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  • DNS failover across multiple datacenters?

    - by Jae Lee
    I've got a site that is starting to get a lot of traffic and just the other day, we had a network outage at the datacenter where our loadbalancer (haproxy) is hosted at. This worried me as despite all my efforts of making the system fully redundant, I still could not make our DNS redundant, which I think isn't an easy solution. Only thing I was able to find was to sign up for DNS failover from places like dnsme, etc .... but they cost too much for budding startups. Even their Corporate plan only gives you 50 million queries per month and we use that up in a week. So my question is, are there any self hosted DNS we can do that provides the failover like how dnsme does it?

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  • Windows apps keep switching to accented text

    - by Josh Kelley
    Somehow I keep hitting a shortcut key (or something similar) that enables the input of accented text. Whenever this accented text mode is enabled, pressing ' doesn't respond immediately; instead, the ' key is remembered, so if I press a vowel after that, I get the vowel with an acute accent mark, and if I press any other key, I immediately get an apostrophe followed by the other key. I don't want this to happen. It's very annoying. How do I disable this mode? I only remember seeing this in Firefox 3.6.3 and Pidgin 2.6.6, so maybe it's a GTK feature. It apparently happens on a per-application basis, and restarting the application fixes it. I checked Windows 7's "Region and Language" control panel and didn't see anything relevant (although I'm not intimately familiar with all of those settings, so I may have overlooked something).

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  • Picasa v.3.6.2 for Mac is suddenly very slow - what are the implications of rebuilding my database?

    - by 3rdparty
    Recently Picasa v3.6.2 for Mac has become very sluggish - mainly noticable for any (non destructive) changes made to photos such as starring an image. This action used to be nearly immediate, but recently I've found it can take 1-3 seconds for Picasa to register the change, and become responsive again. I'm considering rebuilding my Picasa database as per these instructions - however I'm concerned I may lose any pre-existing non-destructive (unsaved) edits, along with Picasa albums that I have created. Curious if anyone has experienced Picasa sluggishness with the latest version and/or what their results have been from rebuilding their database. My last resort is to SuperDuper my drive and then rebuild the database, so I can always restore it if I lose critical data.

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  • One PC, 4 iOS Devices, 4 iCloud Accounts?

    - by Eric J.
    I have one PC running iTunes, my iPhone, and one iPod for each of three kids. Ideally I would like the iPhone to use my iCloud account and each iPod to use an iCloud account specific to each kid. According to Apple: You can ... use one Apple ID for iCloud services and another Apple ID for store purchases However, the method described Enter the Apple ID you want to use for iCloud in Control Panel Network and Internet iCloud. Enter the Apple ID you want to use for Store purchases (including iTunes in the Cloud and iTunes Match) in iTunes iTunes Store. would require that all iOS devices share the same iCloud account if they use iTunes on the same PC. Short of having one PC per family member, is there a method to use different iCloud accounts on each iOS device?

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  • Automatic storing package before installing it on .deb based system?

    - by macias
    The reason I am asking this question is I am concerned about simple rollback (I already read how to find out what packages were installed). So I would like to set global (per entire system) option, that forces system to store each package before installing/updating it. With such workflow, I could update whatever I want, and if for example the newest version of Dolphin would be worse than previous one I could simply go to directory with stored packages and install previous version instead (the previous version is either base version -- on ISO -- or version from previous update). Is there such feature as global option to automatically store each package before install? It have to be guaranteed that no package is updated on-fly, i.e. without being stored before. I am learning LMDE, but answer for any .deb based system would be fine -- Ubuntu, Debian, you name it.

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  • SQL server Rebuild Index

    - by Uday
    How can we know that before rebuilding index --How much space is required for the Transaction Log file( I knew we may required to consider sort_tempdb option , if we set to ON then we may required to ensure about tempdb space as well , Also if we set off then sorting, temporary indexes(during Build phase of rebuild index) creation will takes place in same Database.)?. Usually I have checked with Many users they say :Log file size =1.5 * Index size. How much space required for the Filegroup for datafiles-for ex-Consider I have one filegroup with 1 Mdf + ndf files. I have MSDN Link :those are pretty good information about per-requisites before rebuild index Link :http://msdn.microsoft.com/en-us/library/ms191183.aspx How can I tell exactly or Approx... to get Log/Primary FG size(or any other filegroup).

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  • Tell browsers to cache until last modified date changes?

    - by Chad Johnson
    My web site consists of static HTML files which are usually republished once per day, and sometimes more. I'm using Apache. In the vhost settings for my site, I'd like to tell browsers to cache HTML files indefinitely, until Apache sees that they are modified. So as soon as an HTML file is changed, Apache should immediately begin telling browsers it's changed and send the updated file. As soon as a new file is published, browsers should immediately begin receiving that...they should never receive old versions of files. Maybe ExpiresByType text/html modification and no "plus x days." Is something like this possible?

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  • How do you set rate limit access to your API using Iptables?

    - by Cory
    How can you set rate limit access to API using Iptables. Tried to set limit using port 80, but I don't want to set limit to the web access entirely. Is there a way to specified a subdomain rather than port. Example: set rate limit to api.example.com not example.com? If there is no way to set rate limit by subdomain, what is the suggested rate limit access to port 80 without risking blocking a legitimate web user? One connection per second would be enough?

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  • How to automatically execute a shell script when logging into Ubuntu

    - by Mike Rowave
    How do I get a script to execute automatically when I log in? Not when the machine starts up, and not for all users, but only when I (or any specific user with the script) login via the GNOME UI. From reading elsewhere I thought it was .bash_profile in my home directory, but for me it has no effect. When I manually execute it in a terminal window by typing ~/.bash_profile it works, but it won't run automatically when I log in. I'm running Ubuntu 11.04. The file permission on my .bash_profile is -rwx------. No .bash_profile existed in my home directory before I created it today. I seem to remember older versions of Linux having a .profile file for each user, but that doesn't work either. How is it done? Do I need to configure something else to get the .bash_profile to work? Or does the per-user login script need to be in some other file?

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  • is there any Open Soruce solution for Failover of incoming Traffic?

    - by sahil
    Hi, We have two ISP... and both ISP's Ip Nat with same Webserver IP, i want failover for incoming traffic , is there any open source solution? can i do it by making two name server , one for each ISP? ... I am not sure but as per my knowledge primary and secondary name server will reply in round robin method till they are live , once any name server will be unreachable then only another will be reply...so if i am right then i think i can do incoming failover by making two name server in my office... Waiting for your valuable response... Thanking you, Sahil

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  • hung up troubleshooting packet discards

    - by Chris Satola
    I realize my question is generic, but hopefully someone may have some guidance for me. My network consists of Cisco switches. I am seeing a significant amount (upwards of millions of packets per day) transmit drops between two switches. One being a 3750 and the other a 3560. The peak throughput of this link is only upper 400Mbps, so it shouldn't be a bandwidth issue. At this point, I am sort of clueless where to look or what tools I can use to determine what packets are dropping and why. I can setup a SPAN port on that link and wireshark it, but I don't know if that could tell me anything. Does anyone have any suggestions? Thanks in advance.

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  • Are there videocamera which geotag individual frames?

    - by Grzegorz Adam Hankiewicz
    I'm looking for a way to record live video with the specific requirement of having each frame georeferenced with GPS. Right now I'm using a normal video camera with a PDA+GPS that records the position, but it's difficult to sync both of these plus sometimes I've forgotten to turn the PDA+GPS or it has failed for some reason and all my video has been useless. Using google I found that about two years ago a company named Seero produced such video cameras and software, but apparently the domain doesn't exist any more and I only find references of other pages mentioning it. Does somebody know of any other product? I need to record this video in HD and have some way to export to Google Maps or other GIS software the positions of the frames in a way that I can click on the map and see what was being recorded in the video at that point. The precission of the GPS tracking is good enough as one position per second, intermediate frames of the video stream can be interpolated.

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  • Java Framework Choice Question.

    - by Sarang
    We do have many frameworks available in Java. Struts, Swing, JSF 2.0, Spring etc are used as per their priority. Actually, I don't know how many they are as well! But, as I am fresher to Java, even learning after their architecture, I cannot decide which framework can be used with what type of Projects ! Also, I am confused with mixed use of framework like Spring + JSF. What is the benefit to it ? Another thing making me confusing is about the UI components available in market. Like, we do have Primefaces, Ice-faces, MyFaces, Rich-faces. They may or may not have been supporting AJAX in-built. They may contains some bugs as well. What is best choice for Framework + UI component that can directly provide a best feet solution for any project ?

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  • How to Merge Data From Multiple Excel Files into a Single Excel File or Access Database?

    - by lalabeans
    I have a few dozen excel files which are all of the same format (i.e. 4 worksheets per Excel file). I need to combine all the files into 1 master file which must have just 2 of the 4 worksheets. The corresponding worksheets from each Excel file are named exactly the same as are the column headers. While each file is structured the same, the information within sheet 1 and 2 (for example) is different. So it can’t be combined into one file with everything in one sheet! I've never used VBA before and I'm wondering where I might start this task!

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  • Tiny linux box with 2xGbLAN, WLAN and 10MB/s AES throughput?

    - by Nakedible
    I'd like to find a small linux box with the following specifications: Small (mini-ITX size is OK) Fanless Runs Debian At least two gigabit network interfaces WLAN that supports "host ap" with hostapd + mac80211 in AP mode Can encrypt AES at least 10 megabytes per second Total cost $300 or less Solutions from multiple parts also accepted - I can buy an external network card etc. and build the box myself if the components are available. If you don't know about the "host ap" thing, just suggest your solution, I'll find out if I can get that resolved. If I can't get all that, I can possibly skip the "runs Debian" part, and I can definitely skip the hostapd part if the box can be a wireless access point with multiple ESSIDs out of the box. Something like Asus RT-N16 is close - doesn't run Debian easily, and probably doesn't encrypt AES fast enough. Something like Zotac ZBOX HD-ID11 is also close - no idea which WLAN card it has and it lacks second gigabit interface, but otherwise nice.

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  • What is better to have more LUNs or more Storages

    - by skomak
    Hi, what is better to have - more LUNs or more Storages. Actually i have 1 storage ESXi per 1 LUN so there are about 15 LUNs and 15 storages. Now there is a kind of problem because the LUNs have different space allocated so if i remove 2 LUNs f.e. 1 2 3 4 [x] 6 [x] 8 9 (like that) i can't make 1 LUN from 5 and 7 pieces of free diskspace on IBM storage array. It's a first argument to not have a lot of LUNs. If i had to make only a few LUNs (about 3) and inside some Storage from ESXi would it be a better idea? For example for expanding storage capacity? i look for good solutions. Thanks in advance.

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  • multiple file systems for mysql

    - by RainDoctor
    Does mysql support multiple file systems for a single database with most of the tables being on MyISAM? Context: we have a 1.5TB mysql database, which is increasing at the rate of 200GB per month. The storage is directly attached, whose slots are almost full. I can add another DAS, and increase the file system. But resizing volume, resizing file system, etc are getting messy. Is there a concept of "tablespace, datafile" (like in oracle) in MySql world? Or how you guys manage mysql db with these kind of constraints?

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  • Fluxbox startup file not working

    - by Jack
    I am placing apps into my fluxbox startup file as per the instructions, however nothing starts up except fluxbox. It doesn't matter what app I try, so it isn't an app problem. here is my startup file: #!/bin/sh # # fluxbox startup-script: # # Lines starting with a '#' are ignored. # Change your keymap: xmodmap "/home/josh/.Xmodmap" # Applications you want to run with fluxbox. # MAKE SURE THAT APPS THAT KEEP RUNNING HAVE AN ''&'' AT THE END. tint2 & tilda & # And last but not least we start fluxbox. # Because it is the last app you have to run it with ''exec'' before it. exec fluxbox # or if you want to keep a log: # exec fluxbox -log "/home/josh/.fluxbox/log" I have also tried tests such as "touch ~/testwoked" and such, nothing works. It makes no difference if the file is executable or not.

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  • What email providers have extremely high reliability and robust SLAs?

    - by Benjamin Manns
    My dad is a professor who does part-time law practice. He had been using his university email address for professional correspondence, when he found out that the university had permanently lost 16 business-related emails in their spam filter (with no apology, notification, or compensation). What I am looking for now is an email provider (preferably with Exchange, but not required) with very high reliability and a SLA that is basically an insurance policy. I have looked at Google Apps's SLA, but this will not suit. I am looking for a provider who will take $X per month in registration fees, and will: Alert me when there is any downtime. Promptly fix the issue Pay me a fee ($Y) whenever there is downtime. I want a significant, contractual reason for them to be diligent in their service. Free service for me is not enough.

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