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• when is java faster than c++ (or when is JIT faster then precompiled)?

  - by kostja

  I have heard that under certain circumstances, Java programs or rather parts of java programs are able to be executed faster than the "same" code in C++ (or other precompiled code) due to JIT optimizations. This is due to the compiler being able to determine the scope of some variables, avoid some conditionals and pull similar tricks at runtime. Could you give an (or better - some) example, where this applies? And maybe outline the exact conditions under which the compiler is able to optimize the bytecode beyond what is possible with precompiled code? NOTE : This question is not about comparing Java to C++. Its about the possibilities of JIT compiling. Please no flaming. I am also not aware of any duplicates. Please point them out if you are.

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• Ubuntu server: Delete first folder in directory

  - by Martin

  How can I grab the first subfolder in a directory and delete it? I found a script to monitor the free diskspace. It sends an alert email if space runs low, but I want to also delete some unneeded stuff. I have a backup folder where I save daily and monthly backups. I want to delete the first folder since this always the oldest, but I don't know the name of the oldest backup. My folders without Jan-May and Dec: 06-01 07-01 08-01 09-01 10-01 11-01 Friday Monday Saturday Sunday Thursday Tuesday Wednesday How can I delete the first folder "06-01" without knowing its name?

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• Inserting rows while fetching(from another table) in SQLite

  - by Samuel

  I'm getting this error no matter what with python and sqlite. File "addbooks.py", line 77, in saveBook conn.commit() sqlite3.OperationalError: cannot commit transaction - SQL statements in progress The code looks like this: conn = sqlite3.connect(fname) cread = conn.cursor() cread.execute('''select book_text from table''') while True: row = cread.fetchone() if row is None: break .... for entry in getEntries(doc): saveBook(entry, conn) Can't do a fetchall() because table and column size are big, and the memory is scarce. What can be done without resorting to dirty tricks(as getting the rowids in memory, which would probably fit, and then selecting the rows one by one)?.

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• How to check use of userva boot option on Win 2K3 server

  - by Tim Sylvester

  I have some 32-bit Win2K3 servers running an application that fails now and then apparently due to heap fragmentation. (Process virtual bytes grows, private bytes does not) I do not have access to the source code or build process of this application. I have modified the boot.ini file on one of these servers to include /userva=2560, half way between the normal mode of operation and the /3GB option. Normally it takes weeks to reach the point of failure, but I'd like to see right away whether this has actually had any effect. As I understand it, this option limits the kernel to the remaining address space (1536MB instead of 2048), but does not necessarily give an application the extra address space, depending on the flags in the application's PE header. How can I determine whether the O/S is allowing a particular application, running in production, to access address space above 2GB? Additionally, what's the best way to monitor the system to ensure that the kernel is not starved for address space, and more generally how should I go about finding the optimal value for this setting?

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• What's an easy way to shut down a computer that I'm connected to via RDP

  - by MBraedley

  I have a secondary machine on my local network that I usually use via RDP. Most of the time, it's on 24/7, but there are times when I may want to shut it down from the RDP client machine. The shutdown and restart options aren't available from the Windows XP start menu when you connect to a machine via RDP, so how can I shut this machine off without actually going to the physical machine? Also note that this computer currently doesn't have a monitor attached to it, which is partly why I want to be able to shut it down over RDP.

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• Drivers and Codec Compilations

  - by Pennf0lio

  Hi, Do you know any software or compilations that you recommend to handle drivers and codecs for newly formated computer? I am having problem gathering drivers and codecs when I format my computer or other's computer because we frequently misplace it's original drivers. I need an offline solution that doesn't need internet. Same for as the codec, when formating computer we frequently lost our codecs, are there codec packs you know that you would like to recommend? P.s. I had tried driver bot but it's only good when your online, I'm looking for a complete package that has all the driver to most common hardware (eg. Monitor, Sound, etc). Thanks!

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• Very fast Laptop Heating due to very high CPU usage by dwm.exe

  - by Sushan Shrestha

  My laptop gets heated very fast and when I check the task manager, I find dwm.exe consuming very high CPU (mostly 100%). In the beginning I found the message "The graphic adapter has been stopped and recovered".Also I am getting one error message "Cidaemon.exe has stopped working" very frequently. During this period also, cpu usage is 100% which is consumed by dwm.exe. I have run ccleaner and Kingsoft PC doctor monitor to fix the register problem but the problem has not been solved. My display adaptor is : NVIDIA NVS 5200M. After the driver update, I am not getting "The graphic adapter has been stopped and recovered" but dwm.exe is still consuming 100% CPU one time in about 5 mins. Multiple restarts has not helped. Laptop Model: Dell Latitude E6430. Thanks in advance.

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• DHCPPloc.exe or equivalent for Windows 7?

  - by Bart B

  There seems to be some DHCP funnyness going on so I need to run something to show me what's going at a DHCP level. Before I upgraded my machine to Windows 7 I used DHCPloc.exe from the Windows XP support tools, and it worked like a charm. I can't seem to find Support Tools for Windows 7, and trying to use the XP tools in compatibility mode doesn't work (I tried, it fails to open a receiving socket). I need a tool to monitor DHCP traffic, and ideally one that lets me filter it to exclude DHCP traffic from our trusted DHCP servers and only show me un-authorised DHCP traffic.

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• Brand new Seagate HDD has high raw read error rate

  - by kpax

  I've just purchased a brand new Seagate ST31000524AS 1TB HDD. Manufacture date shows as January 2012 (yes that's as new as new can get), so must be one of the new batches from the post-flood Thailand. Anyway, I downloaded a copy of Active Hard Disk Monitor tool to check the S.M.A.R.T. parameters and I find the parameter Raw Read Error Rate is very low. Should I be worried? Will this rectify over time? This hdd is just 7 hours old; what gives? Edit: I meant high raw read error rate - Title updated accordingly

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• Dell Latitude E6420 dual-boot Ubuntu + Windows 7 Optimus graphics problems

  - by Ryan

  I have a Dell Latitude E6420 laptop with Ubuntu 12.04 alongside Windows 7 (dual-boot) docked in a docking station with 2 DVI outputs. It took me a week of tinkering to get the dual external monitors to work in Ubuntu, and I had to disabled the "Optimus" feature in the BIOS. But now neither external monitor is detected in Windows, and the resolution is also very low. Do you know how I can successfully dual-boot Windows 7 and Ubuntu on this machine using my 2 external DVI monitors? I have an open question here too, trying to resolve this same issue: http://askubuntu.com/questions/146933/dock-with-dual-external-dvi-monitors-with-intel-nvidia-optimus

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• Gnome - windows always open top left

  - by BobTodd

  I find this a highly annoying "feature" on a wide screen monitor that my mostly used apps - terminal and gedit always open directly under the top-left corner of my screen and I have to drag them to my eye position each and every-time. I have tried installing the CompizConfig Settings Manager and using the feature to position windows centre, but this has had no effect - the force feature here isn't working for me either. I can use e.g. gnome-terminal --geometry=140x50+50+50 for the terminal but this doesn't work for gedit. Any ideas? Thanks

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• Server 2008 locks me out when not using the machine for 10 minutes after installing SP2

  - by Daniel Magliola

  I have recently installed Service Pack 2 on my Windows Server 2008 machine (which I use actively for development, and i'm always logged on to). Now, after this installation, when I don't use the machine for some time (let's say, 10 minutes), it locks itself so I have to press Ctrl+Alt+Del and log back in. I have already checked the Screen Saver settings, and it's "None", as it always has been. I also looked into power settings and everything looks right (20 mins to turn off monitor, and i haven't found any settings regarding locking me in there). Do you have any idea what I can do so that it won't lock me out after not using the machine for a while? Thanks! Daniel

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• How to convert Kindle books into PDF format?

  - by verve

  I'm new to digital books and I use the Kindle app for Windows to read the books I bought but I hate how I can't read the bottom paragraph of a book in the Kindle app in the centre of the monitor; I have to bend my neck down and it gets sore fast. Problem is that I can't move the Kindle book page up or halfway as when I'm reading a PDF document; if you try to move the page in Kindle it skips to the next new page. So, I thought maybe converting my books to PDF will solve the problem. How do I convert Kindle books into the PDF format? Does anyone have another solution? Perhaps a fancier reader that allows me to scroll Kindle book pages? Windows 7 64-bit IE 8

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• What is the worst Mac OS X annoyance in your opinion?

  - by jasonh

  I'll start with multi-monitor support. I'm trying to set up a Macbook to use an external display and I can't for the life of me get it to move the Dock over to the external display. That and it won't let me disable the Macbook's internal LCD. Please put one item into each post so that the community can vote on each issue. Also please list any workaround if you have it and what version of the OS it applies to. Thanks!

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• Why is my metro screen getting extended to half of the second screen?

  - by maximusyoda

  When I extend my desktop to the second screen, it stays fine for a few minutes, but after a while, the first metro screen stretches all the way to half of the second screen. The search bar etc stops working. The desktop itself shares fine. But the metro screen is messed up as well as the resolution. The second screen is using the recommended resolution. All I want is to have an extended screen. The problem occurs in my office Windows 8 laptop as well. Not sure what to do with it. Device: Surface Pro 2 External Monitor: Dell 2208WFP 1680 x 1050 Pixel Resoultion 22''

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• Monitoring host and app parameters in real-time

  - by devopsdude42

  I have a bunch of VMs that I need to monitor in real-time. For all nodes I need to watch host parameters like load, network usage and free memory; and for some I need app-specific metrics too, like redis (some vars from the output of INFO command) and nginx (like requests/sec, avg. request time). Ideally I'd also like to track some parameters from the custom apps that run on these node too. These parameters should get tracked as a bunch of line charts on a dashboard. I checked out graphite and it looks suitable (although the UX and aesthetics looks like it needs some love). But setting up and maintaining graphite looks to be a pain, esp. since we don't have a full-time person just for this. Are there any alternatives? Or at least something that is simpler to setup and will scale? Reasonable paid services are also ok.

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• Motherboard warning lights when plugging in a display port cord to graphics card?

  - by rllr

  Earlier today, my computer spontaneously shut itself off and refused to turn back on. I tested my PSU and it's operating fine. I unplugged everything and let it sit for a while and it started to make a high pitched coil whine/hiss. When I came back an hour later and plugged in only the power cord, it turned on without any issues. After some troubleshooting, I noticed my motherboard (Intel D975XBX2) has a red CPU led and VR led that come on whenever I plug my monitor into my graphics card via display port. DVI does not cause a similar issue. I was running three monitors off the card, so I need both DVI ports and the display port working. Is it likely my graphics card needs to be replaced, or should I be looking elsewhere to resolve this issue?

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• how to troubleshoot shutdown problems in windows 7

  - by Ieyasu Sawada

  I have a desktop with windows 7 ultimate installed. Whenever I shut it down from the start button. The text that says that it is logging off and shutting down is present and the monitor blacks out and says no signal. But the lights in the RAM is still on and all the fans in the desktop is still spinning. Why is that? It seems like its not shutting down completely. I have also got disk problems lately. Event id 175 and 50. Which I think is caused by the computer not shutting down completely. How do I troubleshoot this one? Feel free to ask if you need more details, thanks.

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• Share history in multiple zsh shell

  - by michael

  I am trying to setup zsh so that it shares command history between different zsh sessions: in multiple tabs in multiple gnome-terminals in different screen sessions I have put this in .zshrc #To save every command before it is executed (this is different from bash's history -a solution): setopt inc_append_history #To retrieve the history file everytime history is called upon. setopt share_history but that does not work. e.g. I type 1 command: gedit afile and then I go to and zsh and type history. I don't see gedit afile. output of 'setopt' is % setopt nohistbeep histexpiredupsfirst histfindnodups histignorealldups histignoredups histignorespace histnostore histreduceblanks histsavenodups histverify incappendhistory interactive monitor promptsubst sharehistory shinstdin zle How can I achieve this?

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• How to programmatically control slave computer on BIOS level?

  - by PovilasSid

  I want to run some test on hardware level. My goal is to create or find a way to control one computer from another down to BIOS settings changing. For example: Master computer sends a signal for slave to restart and opens BIOS settings dialog. Master computer sends a signal to slave to change BIOS parameters and then restart. Then slave fully boots up master starts up some software on slave. Then software finishes operations cycle continues till certain conditions are met. I know that I am looking for a complex thing but mainly what I need are correct keywords because now I am being flooded by BIOS configurations tutorials. Main concerns: Is it possible without using any custom tailer chip? How can master monitor salve`s hardware activity? How to let master handled more than one slave? How what connections are needed to create this kind of setup? (cables)

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• Network and log monitoring and vulnerability scanning

  - by user137799

  I am trying to find out if there is any application or service in UNIX that will - 1. Monitor network interfaces for bandwidth usage 2. When network flaps occur send out a e-mail. 3. When duplicate mac-addresses or loop occurs in network - send out alerts. 4. Do a network vulnerability scan and be able to detect utorrent application on our network. Need to know which linux distribution will be best to support that specific application Thanks

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• How do anti-viruses work?

  - by Phoshi

  So I was thinking about viruses recently, and wondering how exactly antiviruses keep up? Considering anybody who'd been coding for a few weeks could hack together something do do nasty, nasty things to somebody's PC, the quantity alone would make a simple list of hashes prohibitive, so how do antiviruses do it? Do they monitor process activity and have a 3 strikes rule for doing virus-like things? And if so, what's stopping it from triggering on perfectly harmless things (like me moving files around in \system32)? I did a bit of googling, but the regular places didn't particularly help, and I couldn't find a dupe here, so I thought it'd be good to ask :)

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• Which programs using my internet connection ? [closed]

  - by Eray Alakese

  Possible Duplicate: Monitor all and any internet traffic from my home PC - what should I use? My internet connection has 4GB quota. But my quota is run out very fast. I setup Net Limiter , for look which programs using my internet connection. But there isn't any weird program. There is only firefox.exe . So, how can i look all programs which using my connection and leech my bandwidth quota? For example, is there any CMD command ? like netstat

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• Rsync over NFS with QoS: How to view real transfer speed?

  - by Ian Mackinnon

  We have a bandwidth limit between a Linux server and a NAS, created using 'tc' with an IP filter. When writing to an NFS mount of the NAS, rsync claims a very high transfer speed for each file and then waits a long time before acknowledging that everything has finished. The total time taken is consistent with the QoS limit and the time taken by the same transfer over FTP. Why does the write to the NFS mount report higher transfer speeds than are actually happening over the network? How can I monitor the actual bandwidth of the transfer?

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• Lock Windows keyboard and mouse but still display screen normally

  - by Stephen Lacy

  I'm using windows 7, I have a dual monitor display. It displays important information related to the business, I'd rather that random users that walk in can't just walk over to it and start using the computer with the same access rights as the user the monitoring software is running as. What I would like is if any time someone presses a button on the keyboard including alt-ctrl-delete all that would appear is a dialog asking for a password. Then I can click cancel and it will return to showing the data I want displayed. ClearLock doesn't work I tried it btw

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