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• The eval(base64_decode()) virus has infected a server. Would removing executable permissions help solve the issue?

  - by Bravo.I

  The eval(base64_decode()) has infected a server. This is a PHP virus that uses the eval function in PHP and replicates itself to all the PHP files on the system as far as I'm certain. Would removing executable permissions help solve the problem?! Please answer really fast, and also, if you've got any better ideas on how to stop this virus.. I'm all ears. The virus has replicated itself to several folders in the directory and most of the other folders are actually several other websites...

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• How to preselect nodes using jsTree jQuery plug-in

  - by Ed Schembor

  I am using the jsTree jQuery plug-in with its "Checkbox" plug-in and using an async http request to lazy-load each level of the tree. All works great, except that I cannot get the tree to pre-select certain nodes after the first level. I am using the "selected" attribute to provide an array of ID's to preselect. ID's in the top level of the tree are correctly pre-selected. However, ID's in lower levels of the tree are not selected when the level loads. Am I missing something? Here is the constructor code: $(sDivID).tree( { data : { async : true, opts : {url : sURL} }, plugins:{ "checkbox" : {three_state : false} }, selected : myArrayOfIDs, ui:{ theme_name : "checkbox", dots : false, animation : 400 }, callback : { beforedata : function(NODE, TREE_OBJ) { return { id : $(NODE).attr("id") || 0, rand : Math.random().toString() } } } } )

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• How to use V8's built in functions

  - by Victor jiang

  I'm new in both javascript and V8. According to Google's Embedder's Guide, I saw something in the context section talking about built-in utility javascript functions. And I also found some .js files(e.g. math.js) in the downloaded source code, so I tried to write a simple program to call functions in these files, but I failed. Does a context created by Persistent<Context> context = Context::New() have any built-in js functions? How can I access them? Is there a way to first import existing js files as a library(something like src="xxx" type="text/javascript" in HTML page) and then run my own execute script? Can I call google maps api through the embedded V8 library in app? How?

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• How to simulate slow internet connection

  - by V-Light

  I currently deploy with GAE (google app engine) and I try to implement some AJAX validation. So I got a couple text-fields and "spinners" (ajax loaders) which should be displayed when an AJAX request is sent. But I deploy on my local computer (localhost), so the GAE SDK reacts very fast on any request. It takes about 50-70 ms(miliseconds) to perform the whole ajax request, which is far far away from the real. Is there a way to somehow simulate slow Internet connection? I just want to see how my "spinners" work. I want to test some ajax setting (jquery) about timeouts, errors and so on... Any ideas ?

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• Get hard drive to spin up upon mouse movement

  - by John

  My storage drive which does not contain the OS stops spinning after a few minutes. This is annoying and totally defeats the purpose of having a fast access drive. The drive will NOT spin up when I use the mouse! It only spins up when accessed. However, I don't want it to spin all the time. I would like it to spin up anytime there is mouse activity so it is at the ready when I am using the computer, but go to sleep during inactivity. Can anyone think of a trick to get a secondary drive to spin up on a mouse movement?

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• AudioQueue recording as float

  - by niklassaers

  Hi guys, I would like to have the result from my recording as a float in the range [0.0, 1.0], alternatively [-1.0, 1.0] because of a bit of math I want to do on it. When I set my recordingformat to be in float, like this: mRecordFormat.mFormatFlags = kLinearPCMFormatFlagIsFloat; I get: Error: AudioQueueNewInput failed ('fmt?') Does this mean the hardware doesn't support recording to floats? If not, how do I set it to record in floats? If so, are there any processor-friendly ways I can convert a signed integer array to a float array? Cheers Nik

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• Why use multiple partitions on a rhel server?

  - by Jakobud

  I'm about to reformat and reinstall CentOS onto an old server. The server runs on a modest 30 node small business network and has a variety of responsibilities including MySQL, a Samba share, DHCPd & SVN/Trac. The old sysadmin had this server setup with almost a dozen different partitions for various things. I'm trying to understand what the advantages of multiple partitions are as opposed to a just one filesystem at /. Speed? Flexibility? Security? It seems like if you misjudge the necessary size for any given partition and it ends up filling up too fast, it requires a sysadmin to go in and expand the partition, etc... Seems like it would be easier if everything was just one flat / filesystem. But I'm sure there are some advantages I'm not aware of. The server is currently running a handful of HDDs raided to ~2TB (raid 0).

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• Buildcraft Minecraft mod causing crashes, NVIDIA-304xx Linux Drivers, KDE

  - by wolfo9999

  All is perfect, 96 fps average. Until an item tries to enter a buildcraft pipe. Tekkit instantly crashes, no error dialog. I have no idea what logs to look at for information on the crash, or how to fix it. OpenGL is enabled in KDE, Driver package is nvidia-304xx lspci output: VGA compatible controller: NVIDIA Corporation GT218 [Quadro FX 380M] (rev a2) (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company Device 172b Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at d2000000 (32-bit, non-prefetchable) [size=16M] Memory at c0000000 (64-bit, prefetchable) [size=256M] Memory at d0000000 (64-bit, prefetchable) [size=32M] I/O ports at 5000 [size=128] [virtual] Expansion ROM at d3080000 [disabled] [size=512K] Capabilities: <access denied> Kernel driver in use: nvidia

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• Slow logins with roaming profiles

  - by tliff

  We are running an ActiveDirectory environment with Windows 2008 as DC and Samba 3.3 as fileserver, using roaming profiles. Some of our offices are connected to HQ via slowish links (1/2 Mbit). Naturally this is not very fast but that was expected. What I do not understand is, that if a user logs out (taking a long time to sync, as expected) and then logs in again the next day it also takes a long time to login. And that is what I don't understand. Shouldn't the sync recognize that nothing has changed rather quickly? Also: Is there any decent docu on how the synchronization is implemented?

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• Android: 2D. OpenGl or android.graphics?

  - by DroidIn.net

  I'm working with my friend on our first Android game. Basic idea is that every frame the whole surface is redrawn (1 large bitmap) which then sprinkled all over with large number of particles which produces effect of soapy bubbles where there's a pool of about 20 bitmaps which randomly gets picked to produce illusion that all bubbles (between 200 - 300) are all different. The math engine is in C (JNI) and currently all drawing is done using android.graphics package very similar (since that was the example I was using) to Lunar Lander. It works but animation is somewhat jerky and I can feel by temperature of my phone that it is very busy. Will we benefit from switching to OpenGL? And as a bonus question: what would be a good way to optimize the drawing mechanism (Lunar Lander like) we have now?

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• MaxClients in apache. How to know the size of my proccess?

  - by Larry

  From http://httpd.apache.org/docs/2.2/misc/perf-tuning.html The single biggest hardware issue affecting webserver performance is RAM. A webserver should never ever have to swap, as swapping increases the latency of each request beyond a point that users consider "fast enough". This causes users to hit stop and reload, further increasing the load. You can, and should, control the MaxClients setting so that your server does not spawn so many children it starts swapping. This procedure for doing this is simple: determine the size of your average Apache process, by looking at your process list via a tool such as top, and divide this into your total available memory, leaving some room for other processes. The main issue is that I can't understand how to know the size, because, well i have the size of httpd on no more of 3888 But, if we need to determine the number for MaxClients, and I have 4GB of RAM, so I get: 972, so I should use like 900 in the MaxClients?

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• Apache VirtualHost running very slow on OS X 10.7 (Lion)

  - by jwerre

  I've set up a few virtual hosts in Lion and it's running very slowly. NameVirtualHost *:80 <VirtualHost *:80> ServerName localhost DocumentRoot "/Library/WebServer/Documents" </VirtualHost> <VirtualHost *:80> ServerName dev.local DocumentRoot "/Users/me/mysite" <Directory /Users/me/mysite> Order allow,deny Allow from all </Directory> </VirtualHost> then in /etc/hosts I added 127.0.0.1 dev.local Everything works fine but it's sooooo slow — 5 or so second to reload a simple "Hello World" html page. Here's is the strange part. If I make a symbolic link of the site in my ~/Sites folder (ln -s ~/mysite ~/Sites/mysite) and navigate to http://localhost/~me/mysite It's nice and fast the way it should be.

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• AWS RDS MySQL remote connection extremely slow

  - by nute

  I have a site hosted on AWS EC2 (Elastic Beanstalk), with a MySQL database hosted on AWS RDS. Everything works fine on the production server, fast and all. However when I try to connect remotely from my local machine, it sometimes gets extremely slow (like 4 minutes to load the list of tables), or simply times out. I added my IP in the security group (which I did correctly, since it sometimes works). When it doesn't work, I at the same time check the prod server and it still looks good.

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• Is Windows XP Pro not a good Hyper-V guest citizen?

  - by Magnus

  On my Windows Server 2008 R2 w. the Hyper-V role, I have these guest VMs: 3 x Windows Server 2008 R2 2 x Windows Server 2003 x86 2 x Windows 7 x64 1 x Windows XP Pro x86 In general, all machines are very fast and responsive. However, the Windows XP Pro guest is very sluggish. It can take up to 2 minutes to connect to the console/or a RD session. Sometimes it can "go into sleep" for several minutes. I have tried to add a 2nd CPU and more memory, but it doesn't help. When the issue happens, it's more or less impossible to get a responsive Task Manager up to analyze which process is hogging the CPU. But I have noticed that it can be various processes; lsass.exe, crss.exe etc. Integration Services is installed. Microsoft Security Essentials is installed, but I have tried without it, no difference. Any ideas?

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• Should you disable page file with SSD?

  - by Pyrolistical

  I've been reading this question, and it has a lot of great information. But assuming you have more than enough ram, I think page file should be disabled on SSD to extend the life time. I know you would lose the core dump on crash, but not many people need that information. From my understand without a page file as you reach the limit of your ram that might trigger thrashing on disk. But for SSDs there is no concept of thrashing, reads are fast. What do you guys think?

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• Windows 8 slow after refreshing and rebooting

  - by Dan Drews

  First, I apologize if this is in the wrong place. I use S/O a lot but not the other sites much. I have an HP Split X2 that has been very choppy as of late (takes several seconds to respond to any form of input), so I went ahead and did a system refresh. After the refresh everything ran very fast as it should, then when I went to download my old apps I needed to reboot. After rebooting, it went back to the choppiness. Does anybody have any thoughts on what this could be?

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• How do I perform an HSL transform on a texture?

  - by Mason Wheeler

  If I have an OpenGL texture, and I need to perform HSL modifications on it before rendering the texture, from what I've heard I need a shader. Problem is, I know nothing about shaders. Does anyone know where I would need to look? I want to write a function where I can pass in a texture and three values, a hue shift in degrees, and saturation and lightness multipliers between 0 and 2, and then have it call a shader that will apply these transformations to the texture before it renders. The interface would look something like this: procedure HSLTransform(texture: GLuint; hShift: integer; sMult, lMult: GLfloat); I have no idea what's supposed to go inside the routine, though. I understand the basic math involved in HSL/RGB conversions, but I don't know how to write a shader or how to apply it. Can someone point me in the right direction? Delphi examples preferred, but I can also read C if I have to.

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• How to setup and manage a shared hosting server on Windows Server 2008 R2 Web Edition?

  - by Motivated Student

  Background I am a newbie in using Windows Server 2008 R2 Web Edition (and other editions as well). I have a static IP, a very fast internet connection, a server (PRIMERGY TX100 S1 Server) and Windows Server 2008 R2 Web Edition (trial version). The objective is to setup the server to be a shared hosting server such that each of my friends has a private account to manage his/her domain. to upload his/her web content to the server using the encrypted ftp. to manage database administration. to manage Certificate. etc Questions Is there a good reference to learn "how to setup and manage a shared hosting server on Windows Server 2008 R2" ? What are the rough steps I have to do to accomplish my objective?

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• Extrapolation using fft in octave

  - by CFP

  Using GNU octave, I'm computing a fft over a piece of signal, then eliminating some frequencies, and finally reconstructing the signal. This give me a nice approximation of the signal ; but it doesn't give me a way to extrapolate the data. Suppose basically that I have plotted three periods and a half of f: x -> sin(x) + 0.5*sin(3*x) + 1.2*sin(5*x) and then added a piece of low amplitude, zero-centered random noise. With fft/ifft, I can easily remove most of the noise ; but then how do I extrapolate 3 more periods of my signal data? (other of course that duplicating the signal). The math way is easy : you have a decomposition of your function as an infinite sum of sines/cosines, and you just need to extract a partial sum and apply it anywhere. But I don't quite get the programmatic way... Thanks!

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• Options to optimize lotus notes 8.5.X

  - by Jakub

  Has anyone found actually useful optimization methods for the bulky, fat, eclipse giant, nuissance that is Lotus Notes 8.5? I want it to be fast, and not eat up system resources like crazy while I run it ALL day (as it is my company's corporate mail / cal / scheduling solution). I've tried various hacks for the JVM heap size (if I recall correctly). None really bring a performance improvement. I have a dual core cpu, if that helps (I tried going the route of optimizing JAVA for 2 cores in hopes it would work, but seen no speed improvement). Notes is just sooo bloated, anyone have any suggestions to optimize/mod this thing so it is more responsive and less of a resource hog. Note: I don't want to switch to the web version, or the standard stripped down versions, I am aware of those, I just cannot since we don't run those internally for the company.

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• Is putting the swapfile & temp folder to ramdisk a good idea in Windows 7 64 bit with lots of RAM?

  - by Tony_Henrich

  I want my Windows to run as fast as possible. If I have 12GB RAM in Windows 7 64bit, quad core CPU, and all apps fit in memory, will the swap file ever be used for anything? The question is about if it's a good idea to put the swap file in a RAM disk. Would a RAM disk help in any way or will Windows intelligently use all the available memory for all its work? I am also thinking of putting the temp folder on a RAM disk. I know the RAM disk is volatile memory and I don't care about its content if it gets lost.

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• Mono on Linux: Apache or Nginx

  - by Furism

  Hi, I'm developing an ASP.NET application that will be run under Linux/Mono for various reasons (mostly to stay away from IIS, quite frankly). Of course the first web server I had in mind was Apache. But Apache, for all its advantages, adds a lot of overhead. Also, the application I'm building needs to be highly scalable and performance is one of the main concern. Apache has, obviously, a very good reputation and its record speaks for itself, but I don't need things like Reverse Proxy or Load Balancing because dedicated network devices would be used for that. So those modules from Apache will never be used. So basically my question is: since Nginx seems to fit exactly needs, is there any caveat I should be aware of? For instance, is Nginx renowned to be particularity safe? When security flaws are detected, how fast are they patched? Any insight on the pros and cons of using either of those servers in conjunction with Mono is welcome.

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• apache2 and php slow first load on Ubuntu VPS - something like mysqltuner but for apache?

  - by talkingnews

  Ubuntu 10.10 64 bit VPS, 512Mb dedicated RAM. Mysql tuned so that sqltuner is completely happy. Used RAM never above 350Mb out of the 493 available. Load never exceeds 1.04 or so. httpd.conf tuned as per all the guides for vps of that memory - amount of preforks, spares etc. But for the FIRST load a site after having not visited for a while, it's taking ages. First load: Parse Time: 3.576 - Number of Queries: 50 - Query Time: 0.019723195953369 Reload Parse Time: 0.096 - Number of Queries: 39 - Query Time: 0.0066126374511719 Subsequent reloads will be at this speed. htop shows two items as soon as I load that page for the first time: php-cgi /usr/sbin/apache2 -k start I'm using suPHP but I've tried fast-cgi and cgi. Stuck now, a weekend of tweaking has brought me nothing. Advice appreciated.

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• Using python to play two sine tones at once

  - by Alex

  I'm using python to play a sine tone. The tone is based off the computer's internal time in minutes, but I'd like to simultaneously play one based off the second for a harmonized or dualing sound. This is what I have so far; can someone point me in the right direction? from struct import pack from math import sin, pi import time def au_file(name, freq, dur, vol): fout = open(name, 'wb') # header needs size, encoding=2, sampling_rate=8000, channel=1 fout.write('.snd' + pack('>5L', 24, 8*dur, 2, 8000, 1)) factor = 2 * pi * freq/8000 # write data for seg in range(8 * dur): # sine wave calculations sin_seg = sin(seg * factor) fout.write(pack('b', vol * 127 * sin_seg)) fout.close() t = time.strftime("%S", time.localtime()) ti = time.strftime("%M", time.localtime()) tis = float(t) tis = tis * 100 tim = float(ti) tim = tim * 100 if __name__ == '__main__': au_file(name='timeSound1.au', freq = tim, dur=1000, vol=1.0) import os os.startfile('timeSound1.au')

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• Limit Windows PC Network/Internet Throughput

  - by Jon Cram

  I have a Vista x64 machine on a fairly fast Internet connection and either buggy drivers for the onboard Ethernet or faulty onboard Ethernet hardware. If I sustain too high a throughput on the Ethernet connection the network connection within Windows fails and I have to restart the machine to restore connectivity. I don't believe I can fix this issue (I'm erring towards faulty hardware) but would like to mitigate the effects by limiting my network throughput. I'm in a position where I would like to download a 5GB file from the Internet (a game install via Steam) and am certain that as this will take a few hours I will not be able to complete the download before my network connection within Windows fails. From downloading content through a BitTorrent client I have found that by limiting the download throughput to around 150 kilobytes per second I can maintain a steady network connection. I can't directly limit the throughput of the download through the Steam client and would instead like to find out how I can limit the throughput of my Ethernet connection within Windows. Any suggestions on how I can achieve this?

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