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• How do "modern JVMs" differ from older JVMs?

  - by Lord Torgamus

  Here's a phrase that I heard a lot throughout high school and university computer science classes: "That's not an issue for modern JVMs." Usually this would come up in discussions about overall performance or optimization strategies. It was always treated as a kind of magical final answer, though, as if it makes issues no longer worth thinking about. And that just leads me to wonder: what are the differences between the prototypical "modern JVM" and older JVMs, really?

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• Well written open source java projects

  - by Algorist

  I want to improve my design and programming skills by understanding design & code of open source projects. I downloaded hadoop,groovy but they are very difficult to follow. I am not having a clue of how to follow this code without having a high level overview of the design. Any suggestions?? Thank you.

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• Thread affinity

  - by mita

  Can we set two thread or two task to execute with different processor affinity in C#.net Application? I have read about SetThreadAffinityMask but there is no example to have that used.. or Is there any way TPL(Task Parellel Libray) executes two thread/Task in with high priorty to use 100% cpu ?

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• trouble connecting ups

  - by Jure1873

  I've got a riello UPS connected to my server through USB. The output from dmesg is: [1362998.520035] usb 2-2: new low speed USB device using uhci_hcd and address 7 [938715.763270] usb 2-2: configuration #1 chosen from 1 choice [1363008.726243] input: Ups Manufacturing RS232-USB converter as /class/input/input7 [1363008.749408] input: USB HID v1.00 Gamepad [Ups Manufacturing RS232-USB converter] on usb-0000:00:1d.0-2 Now the program for controlling the UPS is expecting me to input the device path (/dev/ttyUSB0), but it doesn't get created. What is /class/input/input7 and where is it? Do i have to install additional drivers?

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• Symlink across local volumes in webroot?

  - by geerlingguy

  I am looking for a good short-term solution to storage space concerns on my website. Currently, I have all uploaded files (flash video, images, etc.) inside the 'files' directory in my web root (/home/account/public_html/files). That directory is located on my high-speed main hard drive (a 15k SCSI drive). I have another drive with much more capacity, but spinning at 10k rpm (so still fast, but not as good for random reads/writes as the main drive. The entire drive is mounted at /backup Right now I'm just using it as a backup volume. I would like to create a symlink from my /home/account/public_html/files folder to /backup/files, and have all files reside on the second drive. However, if someone accesses a file at http://www.example.com/files/filename.jpg, would it still work if I symlinked to the second drive? (Basically, would Apache/PHP automatically know to follow the symlink for that directory?).

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• Graphic Setup tune-up checklist

  - by Click Ok

  I was trying to play the game Warzone 2100 and the games runs fine, with nice speed, but the screen stays with a horizontal lines "flickering"... My PC have a integrated GeForce Go 6100 vga. Ok, not a powerfull vga, but it's not the end of the world to run a "simple" game like this (compared with another games that ask you send your eyes to purchase a expensive vga). So, I think that the problem can be of the configuration of my machine. I use it in first instance for programming jobs, so I underpay attention to video setup. I would like about a checklist to know if my PC is "ready" to games. By example, I know that I need: Lastest vga drivers Updated DirectX and OpenGL What you suggest? There is too some good programs to test performance and suggests improvements in the system? Thank you! PS: I'm using Windows 7

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• gcc options for fastest code

  - by rwallace

  I'm distributing a C++ program with a makefile for the Unix version, and I'm wondering what compiler options I should use to get the fastest possible code (it falls into the category of programs that can use all the computing power they can get and still come back for more), given that I don't know in advance what hardware, operating system or gcc version the user will have, and I want above all else to make sure it at least works correctly on every major Unix-like operating system. Thus far, I have g++ -O3 -Wno-write-strings, are there any other options I should add? On Windows, the Microsoft compiler has options for things like fast calling convention and link time code generation that are worth using, are there any equivalents on gcc? (I'm assuming it will default to 64-bit on a 64-bit platform, please correct me if that's not the case.)

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• Web application performance: PHP or Python?

  - by Michael

  Which technology is better to use in terms of performance for high performance scalable web application? PHP or Python? The project is going to involve database.

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• Support-function in the GJK-algorithm.

  - by Marcus Johansson

  I am trying to implement the GJK-algorithm but I got stuck instantly. The problem is to implement the Support-function that isn't O(n^2). As it is now I'm computing the complete Minkowski difference, and then there is really no point in doing the GJK-algorithm. (or is it?) What I mean by Support-function is the function that returns the point in the Minkowski difference that is furthest away in a specified direction. I assume this shouldn't be O(n^2) as it is in my current implementation.

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• Is there a way to force Windows to recognize a network folder as a local drive, for the purposes of

  - by NoCatharsis

  I just started using the file search program Everything at work to search through documentation on our shared drives. This is after disappointments with Google Desktop and Windows Search. I love the speed of Everything, but I wish it were able to index other shared folders. My makeshift solution was to somehow force Windows to recognize the necessary shared folders as local drives, then add them to the index list. I have also considered using SyncToy, but this requires downloading all data to my drive, which could be terabytes of information - obviously not a good idea on a small company network. What would be the best solution here?

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• Should I consider Erlang for web mvc?

  - by gotts

  Can I do that? I'm afraid that this can be an overkill and eventually I'll end up with much less productivity than with traditional stack like Ruby/Python/you name it. I understand that you will start with much lower productivity if you start to work with new technology but .. is it potentially worth trying and finally switch to Erlang as the only tool for web development and all the backend stuff. Or is Erlang more suitable for only some high performance backend tasks?

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• Monitor ESXi hosts with Nagios

  - by Kyle Brandt

  Does anyone recommend any methods for monitoring ESXi 4.1 hosts with Nagios? I have looked into SNMP but it seems to be in a pretty sorry state. Net-SNMP does not seem to be included and there is a built it SNMP daemon that I set up. However from the standard MIBs there only seems to really be network interface counters and the VMWare MIBs seem quite useless. Right now I am considering SNMP for the interface speed and trying the plugins listed at http://unimpressed.org/post/96949609/monitoring-esxi-performance-through-nagios . Anyone have a better idea? I would like to monitor the hosts directly, not through something like vCenter.

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• What do light purple color mean in uTorrent

  - by blasteralfred

  I run uTorrent 3.1.2 in my Windows 7 PC. When I download one file, I see some purple colored lines under Files Tab Pieces. Below is an image of what I am telling (little resized); I think that the light green color indicates downloaded parts. But I have no idea about purple lines. The file is a streamable mp3 file. The connection speed is very low, about 5KB/s down and 1KB/s up. The done file size is not progressing in a smooth way (usually changes in KB are visible), it stays as it is for sometime and then changes to a size (changes in MB), and again the same thing. Questions: Why does this happen? What does the purple color mean? Thank you.

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• How to handle knowledge handover effectively?

  - by Zizzencs

  Let's say a large enterprise opens a new office in (insert random location here) and want the new colleges up to speed as fast as possible. Let's also say this enterprise is a very typical one with a complex environment, lots of history and almost full lack of documentation. What's already been decided is that the new colleges will receive howto-style documentation for the most typical tasks and will get seme architecture documentation for some of the more complicated systems. Any ideas about improving this process? And more specifically, how should such a howto document look like to be helpful?

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• fastcgi-mono-server with Nginx is much slower than xsp4

  - by marxin

  We started testing our MVC4 app on xsp4 server compiled with mono-3.0.3, speed was enough and we decided to set up production fastcgi-mono-server4 (version 2.11.0.0) with nginx (1.2.6-r1). Single query that loads some JSON query took ~200ms on XSP4, but Nginx serves the query in about 1.2s and I am wondering where could be such a slow down? I followed nginx configuration: http://www.mono-project.com/FastCGI_Nginx and fastcgi-mono-server4 uses socket for listening nginx. Do you have any ideas how to log some time stamp which will help me? Thanks

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• Elastic Load Balancing in EC2

  - by Dom

  Hi Its been on the cards for a while, but now that Amazon have released Elastic Load balancing what are your thoughts on deploying this solution for a high-traffic web app. Should we replace HAProxy or consider ELB as a complimentary service in front of HAProxy Appreciate any comments or suggestions Thanks Dom

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• how to active a link using java script

  - by Muhammad Sajid

  Hi i have following links Wall Introduction Activities Reviews Recommendation Photos Discussion and if I click on any link then it must be high lighted.

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• Filtering a dataframe in row names from a column value in R

  - by user1755155

  Basically I have dataframe with two columns (target_id and fpkm). I want to keep only those row names in first column that are not duplicated. For example in the below dataframe you can see there are two row names with the same name (almost) comp267138_c0_seq1 comp267138_c0_seq2 and from both and I want to keep only one comp267138_c0_seq2 based of high value in column 2. target_id fpkm comp247393_c0_seq1 3.197885 comp257058_c0_seq4 1.624577 comp242590_c0_seq1 1.750319 comp77911_c0_seq1 1.293059 comp241426_c0_seq1 1.626589 comp288413_c0_seq1 14.828853 comp294436_c0_seq1 11.555596 comp63603_c0_seq1 1.982386 comp267138_c0_seq1 8.594494 comp267138_c0_seq2 11.134958 comp321623_c0_seq1 6.934149

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• Organizing a random list of objects in Python.

  - by Saebin

  So I have a list that I want to convert to a list that contains a list for each group of objects. ie ['objA.attr1', 'objC', 'objA.attr55', 'objB.attr4'] would return [['objA.attr1', 'objA.attr55'], ['objC'], ['objB.attr4']] currently this is what I use: givenList = ['a.attr1', 'b', 'a.attr55', 'c.attr4'] trgList = [] objNames = [] for val in givenList: obj = val.split('.')[0] if obj in objNames: id = objNames.index(obj) trgList[id].append(val) else: objNames.append(obj) trgList.append([val]) #print trgList It seems to run a decent speed when the original list has around 100,000 ids... but I am curious if there is a better way to do this. Order of the objects or attributes does not matter. Any ideas?

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• How can I decrease the time spent reformatting / restoring user's workstations?

  - by CT

  I just working for a medium sized company (approx. 150 users). When user's workstations need to be reformatted for any variety of reasons, we reformat, reinstall windows from an oem disk, install drivers, install shop desired software, and restore user's documents from latest backup. While the process isn't very difficult it is very time consuming. What are some options simplify / speed up this process? Mostly a complete Windows shop with most servers running Win2k3 Enterprise and workstations running a variety of XP, Vista, and 7. Workstations are purchased through a variety of OEMs mostly Dell.

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• Biggest performance improvement you've had with the smallest change?

  - by JoelFan

  What's the biggest performance improvement you've had with the smallest change? For example, I once improved the performance of a certain page on a high-profile web app by a factor of 10, just by moving "where customerID = ?" to a different place inside a complicated SQL statement (before my change it had been selecting all customers in a join, then later selecting out the desired customer).

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• Speeding Up Search On Ubuntu File Server Accessed Through Windows

  - by John Birdy

  I run an Ubuntu box as a media server, which I use to either share files (copy and paste off of the network drive), or stream to my computer (which runs Win7), or to my xbox. I have a lot of files on there, especially music. Currently when I'm searching for a file, I just use Windows' search, which can be quite slow. I was wondering if there were better ways to search from my Windows box? I'd prefer not to SSH in to the box and use find or something like that. Is there any way to speed up Windows' search? Or an easy alternative? Thanks!

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• What is a quick way to access chrome extensions?

  - by Edward Tanguay

  I'm trying to switch from Firefox to Chrome, so trying to get up to speed with the interface. I have installed some Chrome extensions such as World Clock. To access it I have to: click wrench click tools click extensions on world clock, click "options" click save" and then I can use it. What am I missing here, there must be an easier way. Is there a way to just click something and have all my extensions in a dropdown, i.e. in one click? I couldn't find this on a list of chrome hotkeys.

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• How to minimize services in ubuntu

  - by codeomnitrix

  Hello everyone.I am using ubuntu from last 6-7 months. I am having 512mb ram and a p4 processor with 1.73 Ghz processing speed. And being a programmer i have to work with eclipse and netbeans like ide's, and they sometimes hang. So is there any option in ubuntu to stop the services running just like i do have in windows "msconfig" or mycomputer-manage, and where could i find the details about the services so that i should know what will be its effect if i stop this service. I am using ubuntu 10.10 Thanks

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• Count of memory copies in *nix systems between packet at NIC and user application?

  - by Michael_73

  Hi there, This is just a general question relating to some high-performance computing I've been wondering about. A certain low-latency messaging vendor speaks in its supporting documentation about using raw sockets to transfer the data directly from the network device to the user application and in so doing it speaks about reducing the messaging latency even further than it does anyway (in other admittedly carefully thought-out design decisions). My question is therefore to those that grok the networking stacks on Unix or Unix-like systems. How much difference are they likely to be able to realise using this method? Feel free to answer in terms of memory copies, numbers of whales rescued or areas the size of Wales ;) Their messaging is UDP-based, as I understand it, so there's no problem with establishing TCP connections etc. Any other points of interest on this topic would be gratefully thought about! Best wishes, Mike

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