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• Java multi-threading - what is the best way to monitor the activity of a number of threads?

  - by MalcomTucker

  I have a number of threads that are performing a long runing task. These threads themselves have child threads that do further subdivisions of work. What is the best way for me to track the following: How many total threads my process has created What the state of each thread currently is What part of my process each thread has currently got to I want to do it in as efficient a way as possible and once threads finish, I don't want any references to them hanging around becasuse I need to be freeing up memory as early as possible. Any advice?

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• Windows 7 connect to Lion file sharing

  - by McKvack

  Trying to access my Mac from a Windows 7 computer, I fail with the infamous error 86 incorrect password. Now this appears to be a well-known problem with countless threads on the internet giving as many "solutions" as there are discussion threads about it (mostly ranging from installing third-party commercial samba servers, to switching to some other protocol, to compiling a plain-vanilla Samba installation - the latter which I will probably do when I give up this :) ) I am stubborn, and I believe there must be some problem here that can be solved or worked around, but there is surprisingly little detail about this problem. It appears to have something to do with a mismatch of authentication methods. Trying to run samba in debug mode: sudo /usr/sbin/smbd -debug -stdout gets me this output when trying to access it from Win 7 ... smb1_dispatch_one [smb_dispatch.cpp:377] dispatching SMB_COM_SESSION_SETUP_ANDX smb1_dispatch_session_setup [session_setup.cpp:261] FIXME erase existing sessions log_gss_error [gssapi_mechanism.cpp:97] gssapi: gss-code: Miscellaneous failure (see text) log_gss_error [gssapi_mechanism.cpp:113] gssapi: mech-code: unknown mech-code 22 for mech unknown What is the problem here, and how do I fix it?

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• Video Hosting External or Internal?

  - by user69334

  I have a client who wants to offer videos for downloading or streaming on his website. Now we have hosting for him, which is wonderful: it's reliable and fast, offers unlimited space and databases BUT it only offers 10GB in bandwidth. The videos could easily be placed on his server (unlimited space) but the bandwidth is a real problem. Now I am wondering if he would purchase external hosting for his videos, and people would want to download them, woould this still eat up all his available bandwidth in no time, because the download request would go via his site, or is there a way to circumvent this?

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• Is there no such thing as a Gigabit switch?

  - by Torben Gundtofte-Bruun

  According to the manufacturer specification, even my rather plain desktop computer has "Gigabit Ethernet". So when I want to copy large files over the LAN (not Internet) it would make sense to have a gigabit switch. I'm searching eBay for a gigabit switch for a planned home network upgrade. The products I find are all labeled "gigabit" but they all have 24 x 10/100Mbit autosensing ports and sometimes 2 x 10/100/1000Mbit autosensing ports. It was my understanding that 10/100 is ancient and that modern computers have network interfaces that work with 1000Mbit, so it would make sense to get a switch that has 24 x 1000Mbit ports. Did I misunderstand, or are sellers (deliberately?) mislabeling older hardware? (Let's not dive into wired vs. wireless networks and how "N" wireless is fast. You'd be right, but not answering the question.)

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• opennebula 3.4 in debian squeeze

  - by Jin Splif

  hope can get some advise n help.... currently I am installing opennebula 3.4 in debian squeeze everything have being successful where I am able to access the opennebula sunstone webpage localhost:9869 , use one command but when I tried to create a host the status become error... hope someone can assist me on this thanks sample log Monitoring host abc (0) [InM][I]: Command execution fail: 'if [ -x "/var/tmp/one/im/run_probes" ]; then /var/tmp/one/im/run_probes kvm 0 abc; else exit 42; fi' [InM][I]: ssh: Could not resolve hostname abc: Name or service not known [InM][I]: ExitCode: 255 [InM][E]: Error monitoring host 0 : MONITOR FAILURE 0 -

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• How to store 250TB of data and develop a backup/recovery plan?

  - by luccio

  I'm really new to this topic, so big apology for stupid questions. I have a school project and I want to know how to store 250TB of data with life-cycle for 18 months. It means every record is stored for 18 months and after this period of time can be deleted. There are 2 issues: store data backup data Due to amount of data I will probably need to combine data tapes and hard drives. I'd like to have "fast" access to 3 month old data, so ~42TB on disk. I really don't know what RAID should I use, or is here any better solution than combining disk and data tapes? Thanks for any advice, article, anything. I'm getting lost.

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• Which OS should I chose for my VPS?

  - by Camran

  I am about to order a virtual private server now, and have no experience in any Linux OS whatsoever. I am a fast learner however... My VPS provider provides these OS: Ubuntu 8.04 LTS Ubuntu 8.04 LTS 64-bit Ubuntu 9.10 Ubuntu 9.10 64-bit Debian 5.0 Gentoo Gentoo 64-bit Ubuntu 8.04 LTS + Ruby on rails I don't know what these are, however I have heard about Ubuntu alot, and know there is alot of information about it on the Internet. Will it make any difference which one I chose? I plan on running a classifieds website, which uses PHP, MySql, Java (for Solr) and the usual standard stuff (HTML, javascript...). Which should I chose? And what is the next step after chosing one? Thanks

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• Is there any way to get tree organisation for Windows 7 file explorer favorites?

  - by fostandy

  In XP there was a MenuBar called Favorites which seemed to be based on Internet Explorer Favorites. It was fantastic because it allowed for very fast tree style navigation (if set up correctly you could navigate it using first letter keystrokes, so to access a shortcut named "videos" in a folder named "files" was as quick as Alt-A f v) This was removed in Vista (and imo generally regressed the file explorer). This was fine because I never used it, but I'm resigned to eventually embracing the inevitability that is Windows 7. Dealing with a single non-nested list of favourites is pretty painful to me as I have quite a lot of them. Is there a way to make a tree like favorites structure in Windows 7? My fingers are crossed.

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• buying a computer wondering about the pit falls of haveing a 64 bit OS

  - by biladsf

  _I am getting a custom laptop, i only do .net development, i dont play games or download gbs of video/music. I just want a fast computer. Right now in order to get 8gbs of ram i have to have the 64 bit version of 7. I need to know the following: What pitfalls could i encounter. i know a lot of apps out there are not 64 bit apps and only come in 32 bit version. Business Intelligence Development Studio is a good example. _

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• How do you sync photos with your family?

  - by romkyns

  We've always been trying to share photos within our family, despite all living in different countries. This has been very challenging. We have about 50GB of photos that we share with each other. Everyone organizes them differently, so rsync/Syncplicity don't work. Everyone likes their photos on the fast hard drive rather than a slow website with reduced quality, so online sharing websites are a no-go. So far we have been essentially syncing them manually, via a shared folder that new photos are placed to and collected from. This is laborious and prone to errors, that usually leave one of us without all the photos without even knowing. To those who are in a similar situation, how do you solve this?

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• Rewriting to address on postfix local aliases

  - by Wade Williams

  I was running into the common problem that mail for "root" on my system was having $mydomain appended, and because $mydomain is not in $mydestination, the mail was being sent to our central mail server as "root@domain." I cannot add $mydomain to $mydestination, because if I understand it correctly, that would mean all mail addressed to $mydomain would be looked up locally, and if an alias does not exist, delivery would fail. So, I followed these instructions: Delivering some, but not all accounts locally which seems to have resolved the problem. Mail for "root" is now expanded according to /etc/aliases and delivered to the non-local address I desire. The one oddity however is that the "To:" address still reads "root@domain." Is there any way I can get the "To" address to be the one that the alias directed its delivery? So for example, if my alias says that mail for "root" should go to "hostname-admin@domain" is there any way the "To" address can be rewritten as "hostname-admin@domain?" Currently it still shows as "root@domain."

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• NIS server setting problem in ubuntu

  - by Asma

  Hi, I set NFS for server-client that works properly. Now I am trying to set NIS server-client on same PC's. I am following the instruction from "SettingUpNISHowTo" from https://help.ubuntu.com/community/SettingUpNISHowTo link. But in step-10, "sudo /etc/init.d/nis restart".......it show error fail. If I try to use "ypcat passwd" to check......it shows error YPBINDPROC_DOMAIN: Domain not bound No such map passwd.byname. Reason: Can't bind to server which serves this domain Can anyone able to help me to get rid out from this problem? Is all the step in the document is proper to configure the NIS server? Thanks in advance.

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• UEFI - Linux Mint Boot from USB Doesn't work

  - by Joe Bennett

  I'm running Linux Mint (only OS other than in VirtualBox) and wanting to remove it. I've created a Live USB of Windows 8 using Windows 7 USB/DVD Download Tool - Yes, I know it says Windows 7 but I've been doing research and I am hearing from everywhere that it also works for Windows 8. The ISO was loaded on just fine (AFAIK) Computer came with Windows 8 pre-installed I have Safe boot and Fast boot disabled in the BIOS Settings I have USB as my first boot option I have tried both the USB 2.0 and 3.0 ports Yet, Mint is all that will boot up. Anybody have a similar issue? If it helps, the computer is a Toshiba Satellite S855D Laptop with an AMD APU quad-core processor (3 CPU, 1 GPU)

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• MSA20 RAID5 recovery failure due to URE on another disk

  - by Andrey

  I have MSA20 with one disk array on 12 disks and 3 LUNs on it (each raid 5). A few days ago one disk in one of the LUNs was failed and I replaced it. But raid5 recovering failed at 13% and I see in ADU report that one of the disk has "Errors Logged = 5566" and according SCSI specifications it is URE (Sense Code=0x11, Qualifier=0x00). In serial log I also see URE error. It seems that Raid5 can't be rebuilt because of this. So I have a few questions: Is there a way to recover raid5 still? If I leave new disk that was replaced and remove disk with URE, will other LUNs be destroyed or just failed LUN? If all LUNs will fail what is the sense to make each LUN with own raid on one disk group array if 2 failed disk can destroy all? As I understand the preferred way is to create one disk array for one LUN in future and not one array with few LUNs? Thanks.

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• how to record mic input and pipe the output to another program

  - by acrs

  Hi everyone Im trying to follow a tutorial on generating truly random bits How To Generate Truly Random Bits This is the command from the tutorial but it does not work rec -c 1 -d /dev/dsp -r 8000 -t wav -s w - | ./noise-filter >bits I know i can record my mic input using rec -c 1 no.wav this is the command i tried using rec -c 1 -r 8000 -t wav -s noise.wav | ./noise-filter >bits but i get root@xxc:~/cc# rec -c 1 -r 8000 -t wav -s noise.wav - | ./noise-filter >bits rec WARN formats: can't set sample rate 8000; using 48000 rec FAIL sox: Input files must have the same sample-rate I have complied noise-filter noise-filter I think the tutorial is using an older version of SOX and REC I'm using sox: SoX v14.3.2 on Ubuntu 12.04 server Can someone please help me ?

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• MySQL proxy HA with no need to reconnect after node failure

  - by Matthias

  I use MySQL with Galera wsrep to get synchronous replication, that part it's up and running I need to setup a kind of proxy to handle client connections. Since any node in cluster can fail, clients will not connect nodes directly, but only via proxy. Currently I use Galera Load Balancer which does it work, but with one exception: if one node fails, all clients connected via proxy to that node get connection error and need to reconnect. I have no control over server applications connected to proxy and some of them can't reconnect automatically and need manual restart. So the question is how to force proxy automatically redirect already connected applications to new data node, without need to reconnect?

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• Is it safe to run an operating system from an USB flash drive?

  - by Georg

  I've got a laptop that has a broken harddisk controller. Replacing the motherboard is quite expensive. I thought about buying a flash drive and installing & running the system from it. However, I'm concerned about some things. Speed: Are they fast enough for swap memory (I've got only 1GB RAM installed.) I'm considering buying 2 or 3 of them and making them into a RAID. What about limited write cycles? How long will it last for a system that has a filesystem with journaling enabled? I'd hate to abandon it. Are there significant differences between internal SSD which are used in modern laptops like MacBooks and USB flash drives? What should I expect in 10 years when the memory wear starts kicking in?

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• In general, do 3rd-party laptop AC adapters / chargers work reliably?

  - by MGOwen

  The AC adapters for my 2 dell laptops wore out very quickly. One supplies power but won't charge the battery (it's about 3 years old, the other is a bit newer). Both have worn through to the shielding around the notebook connector and look like they'll be unusable soon. Checking user reviews of the replacement adapter on Dell's own website, it appears they usually fail this fast. Apparently Dell does this deliberately to make money (their adapters sell for about 10-15 times what they cost to make). Same with replacement batteries. I can see there are plenty of much cheaper ($50 less) compatible AC adapters on eBay. Does anyone have experience with these? Naturally I'm nervous a crappy knock-off could fry my notebook, but has this ever actually happened to anyone recently? Has anyone had a good experience? Can anyone recommend a good online seller (who doesn't charge nonsensical shipping costs to Australia, preferably?)

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• How to implement blocking request-reply using Java concurrency primitives?

  - by Uri

  My system consists of a "proxy" class that receives "request" packets, marshals them and sends them over the network to a server, which unmarshals them, processes, and returns some "response packet". My "submit" method on the proxy side should block until a reply is received to the request (packets have ids for identification and referencing purposes) or until a timeout is reached. If I was building this in early versions of Java, I would likely implement in my proxy a collection of "pending messages ids", where I would submit a message, and wait() on the corresponding id (with a timeout). When a reply was received, the handling thread would notify() on the corresponding id. Is there a better way to achieve this using an existing library class, perhaps in java.util.concurrency? If I went with the solution described above, what is the correct way to deal with the potential race condition where a reply arrives before wait() is invoked?

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• zeroconf (bonjour/avahi): macs do not see linuxes and vice versa

  - by codesnik

  In my home network I have several OS X boxes and several Ubuntu boxes. each Ubuntu box sees other boxes via zeroconf. I can "ssh ubuntu1.local" and "ping ubuntu1.local" from "ubuntu2.local", but both fail to lookup OSX boxes. and other way around, I can "ssh mini1.local" from "mbair.local". but it doesn't see "ubuntu1.local" why? do ubuntu and osx use different flavours of zeroconf? could be ubuntu, or osx tweaked to use common flavour?

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• Will there be IQueryable-like additions to IObservable? (.NET Rx)

  - by Jason

  The new IObservable/IObserver frameworks in the System.Reactive library coming in .NET 4.0 are very exciting (see this and this link). It may be too early to speculate, but will there also be a (for lack of a better term) IQueryable-like framework built for these new interfaces as well? One particular use case would be to assist in pre-processing events at the source, rather than in the chain of the receiving calls. For example, if you have a very 'chatty' event interface, using the Subscribe().Where(...) will receive all events through the pipeline and the client does the filtering. What I am wondering is if there will be something akin to IQueryableObservable, whereby these LINQ methods will be 'compiled' into some 'smart' Subscribe implementation in a source. I can imagine certain network server architectures that could use such a framework. Or how about an add-on to SQL Server (or any RDBMS for that matter) that would allow .NET code to receive new data notifications (triggers in code) and would need those notifications filtered server-side.

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• Is there software that will help me convert my PST files into a searachable web archive?

  - by chronoz

  I have used POP3 for many and many years and always used PST files for back-up purposes. I'd like to be able to create a searchable mail archive of this 12GB worth of e-mail. I had used Horde + Qmail for a while for searching e-mail, but it was truly horrible and even extremely slow when searching into a few ten thousands of e-mails, let alone more than a million. I would prefer a free solution that would provide fast searching through historical e-mails. Also, preferably hosted on a server, so I don't have to worry about backing up any more crucial data on my desktop.

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• redundant/multi-site terminal server

  - by Adam

  Hi We have a Hyper-V cluster running 5 virtual terminal servers using HA. We need to be able make this system redundant and so if this site was to fail our users could log into the backup system at another location and access their data via the terminal servers. Any ideas? We were thinking of maybe using a NAS which replicated the data to the other location in real-time(pass-through disks)? and having a similar Hyper-V cluster setup in the backup location. However we would need to create the users in both location and create a virtual mirror without the data ie applications, directories, settings etc. Is this the best way to achieve this? We have read that using Hyper-v pass through disks is a big performance de-grade.

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• WPF/.NET data access models - resource recommendations

  - by jasonk

  We're in the early design/prep phases of transferring/updating a rather large "legacy" 3 tier client-server app to a new version. We’re looking at doing WPF over Winforms as it appears to be the direction Microsoft is pushing development of the future and we’d like the maximize the life cycle/span of the apps. That said during the rewrite we’d like to make as many changes to our data access/presentation model to improve performance as much as possible up front as many. I’ve been doing some research along that vein but the vast majority of the resources I've found that discuss WPF focus only simple data tracking apps or focus on the very basics UI design/controls. The few items that even discuss data presentation are fairly elementary in depth. Are there any books/articles/recommended reading/other resources recommended for development related to large enterprise level business apps? Any “gotchas” that should/could be avoided? General advice to minimize the time underwater

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• Weird execution of ruby/git executables in Windows

  - by Frexuz

  Something strange has happened. I can't run some command line executables in Windows anymore. Steps: Open cmd Run an executable, such as ruby -v or git -h When I do that, a new command prompt opens, running that command (I think, it's too fast to see), and instantly closes again. I've managed to print screen the new command prompt, and it shows that it's running inside this path: C:\Documents and Settings\Administrator\Local Settings\Temp\3582-490 Inside this folder, is the executable I'm tring to run. If I run ruby, then ruby.exe is in there. If I run git, then git.exe is in there. And it's always emptying the folder in between, so there is always just one .exe file

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