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  • A kinetic mouse lag when connecting to a TV via HDMI

    - by Ville Koskinen
    I've been unable to find out what is causing a mouse cursor lag when I'm using my Win7 laptop connected to a 1080p TV via HDMI. The symptom can be described as the cursor feeling 'heavy'. When I'm using the TV screen as an extension to the desktop, there is no lag on the laptop side of the desktop. It does not feel like a refresh rate problem: for example scrolling a big web page on the TV side is pretty OK. Strange huh? Help appreciated!

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  • What's a good(affordable) business router that can limit traffic to certain machines(ips/ports)?

    - by Ryan Detzel
    We are using the basic Verizon router but it sucks so we're looking for a new one that allows us to limit users and our hadoop cluster to certain limits. Our problem is one person can start downloading something and kill the network and every hour we download logs into our cluster but it floods the network unless we rate limit it. Ideally we want to be able to say: total: 35 mbps Hadoop Cluster (15 mbps) Phones (1 mbps) Office(25 people) (19mbps but no one machine can have more than 5mbps)

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  • Dual Monitor flickering

    - by dave
    Hello, I connected my UBUNTU laptop to a 26" monitor. It acts as a dual or extended screen. But the 26" flickers, I set the refresh rate to 70Hz. Appreciate all help to solve this issue. Thanks Dave

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  • Dual Monitor flickering

    - by dave
    Hello, I connected my UBUNTU laptop to a 26" monitor. It acts as a dual or extended screen. But the 26" flickers, I set the refresh rate to 70Hz. Appreciate all help to solve this issue. Thanks Dave

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  • How to check properties of an audio [closed]

    - by Ashni Goyal
    Possible Duplicate: Tool to view video/audio file information Soundeffect class in WP7 requires following properties of the .wav file. The Stream object must point to the head of a valid PCM wave file. Also, this wave file must be in the RIFF bitstream format. The audio format has the following restrictions: Must be a PCM wave file Can only be mono or stereo Must be 8 or 16 bit Sample rate must be between 8,000 Hz and 48,000 Hz How can we check these properties for a given audio ?

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  • European alternatives to Dropbox?

    - by torbengb
    Dropbox is positively brilliant, but the data center is probably in the US somewhere. Since I'm in Europe, there's plenty of lag and a poor upload rate. Are there any similar services using data centers in Europe? I'm looking for a free plan (cirka 2GB), so sites like Amazon S3 aren't good answers.

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  • How to increase fast-forward/rewind on Vista Media Center recorded TV shows?

    - by jtimberman
    How do I granularly increase the various fast-forward/rewind speed/rate for each of the speed settings for skipping through commercials? The current defaults go from barely faster than playback, too fast for unexpectedly short commercials, to omfg its so fast I can't see what is happening. Do people suffer with these defaults, or is there some better setting in the registry, or elsewhere?

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  • Verizon FiOS Speed concerns

    - by Josh K
    I'm working on getting a separate internet connection to run out and I was looking into available options. FiOS claims to offer 25Mb up / 25 Mb down as a maximum rate. Do they have listed minimum rates? Is there anything with fiber I should be concerned about? Special hardware, special routers, availability concerns?

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  • Rotate rectangle around center

    - by ESoft
    I am playing with Brad Larsen's adaption of the trackball app. I have two views at a 60 degree angle to each other and was wondering how I get the rotation to be in the center of this (non-closed) rectangle? In the images below I would have liked the rotation to take place all within the blue lines. Code (modified to only rotate around x axis): #import "MyView.h" //===================================================== // Defines //===================================================== #define DEGREES_TO_RADIANS(degrees) \ (degrees * (M_PI / 180.0f)) //===================================================== // Public Interface //===================================================== @implementation MyView - (void)awakeFromNib { transformed = [CALayer layer]; transformed.anchorPoint = CGPointMake(0.5f, 0.5f); transformed.frame = self.bounds; [self.layer addSublayer:transformed]; CALayer *imageLayer = [CALayer layer]; imageLayer.frame = CGRectMake(10.0f, 4.0f, self.bounds.size.width / 2.0f, self.bounds.size.height / 2.0f); imageLayer.transform = CATransform3DMakeRotation(DEGREES_TO_RADIANS(60.0f), 1.0f, 0.0f, 0.0f); imageLayer.contents = (id)[[UIImage imageNamed:@"IMG_0051.png"] CGImage]; imageLayer.borderColor = [UIColor yellowColor].CGColor; imageLayer.borderWidth = 2.0f; [transformed addSublayer:imageLayer]; imageLayer = [CALayer layer]; imageLayer.frame = CGRectMake(10.0f, 120.0f, self.bounds.size.width / 2.0f, self.bounds.size.height / 2.0f); imageLayer.transform = CATransform3DMakeRotation(DEGREES_TO_RADIANS(-60.0f), 1.0f, 0.0f, 0.0f); imageLayer.contents = (id)[[UIImage imageNamed:@"IMG_0089.png"] CGImage]; imageLayer.borderColor = [UIColor greenColor].CGColor; imageLayer.borderWidth = 2.0f; transformed.borderColor = [UIColor whiteColor].CGColor; transformed.borderWidth = 2.0f; [transformed addSublayer:imageLayer]; UIView *line = [[UIView alloc] initWithFrame:CGRectMake(0, self.bounds.size.height / 2.0f, self.bounds.size.width, 2)]; [line setBackgroundColor:[UIColor redColor]]; [self addSubview:line]; line = [[UIView alloc] initWithFrame:CGRectMake(0, self.bounds.size.height * (1.0f / 4.0f), self.bounds.size.width, 2)]; [line setBackgroundColor:[UIColor blueColor]]; [self addSubview:line]; line = [[UIView alloc] initWithFrame:CGRectMake(0, self.bounds.size.height * (3.0f / 4.0f), self.bounds.size.width, 2)]; [line setBackgroundColor:[UIColor blueColor]]; [self addSubview:line]; } - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { previousLocation = [[touches anyObject] locationInView:self]; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { CGPoint location = [[touches anyObject] locationInView:self]; //location = CGPointMake(previousLocation.x, location.y); CATransform3D currentTransform = transformed.sublayerTransform; //CGFloat displacementInX = location.x - previousLocation.x; CGFloat displacementInX = previousLocation.x - location.x; CGFloat displacementInY = previousLocation.y - location.y; CGFloat totalRotation = sqrt((displacementInX * displacementInX) + (displacementInY * displacementInY)); CGFloat angle = DEGREES_TO_RADIANS(totalRotation); CGFloat x = ((displacementInX / totalRotation) * currentTransform.m12 + (displacementInY/totalRotation) * currentTransform.m11); CATransform3D rotationalTransform = CATransform3DRotate(currentTransform, angle, x, 0, 0); previousLocation = location; transformed.sublayerTransform = rotationalTransform; } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { } - (void)dealloc { [super dealloc]; } @end

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  • What are the most likely bottlenecks determining the performance of CamStudio screen recording?

    - by Steve314
    When doing screen recording, I can get a frame rate of maybe 15 frames per second for the full screen on my 1080p monitor using the XVID codec. I can increase the speed a bit by recording a region, changing screen modes, and tweaking other settings, but I'm curious what hardware upgrades might give me the biggest bang for my buck. My PC is budget, but modern... Athlon 2 X4 645 (3.1GHz, quad core, limited cache) processor. 4GB single channel DDR3 1066 RAM. ASRock motherboard with NVidia GeForce 7025/nForce 630a Chipset. ATI Radeon HD 5450 graphics card - 512MB on board, not configured to steal system RAM. I dual-boot Windows XP and Windows 7. For the moment, XP is my bigger performance concern as it's still my getting-things-done O/S as opposed to my browser-host O/S. My goal is to make a few programming-related tutorials. For a lot of that I don't need screen recording - I can make up some slides, record audio with the PC switched off, yada yada. When I do need screen recording, I'll mostly be recording Notepad++, Visual Studio or a command prompt. Occasionally, I may be recording some kind of graphics or diagram program and using my pre-Bamboo cheap Wacom tablet - I have the CS2 versions of Photoshop and Illustrator, but I'd much more likely be using Microsoft Paint. Basically, what I'll be recording won't be making huge demands on the machine - but recording a fair number of pixels (720p preferred) will be useful. What's particularly wierd - not so long ago I still had a five-year-old Pentium 4 based PC. And (with the same 1080p monitor) it could record at not far from the same frame rate. So clearly the performance issues are more subtle than just throw-money-at-it. My first guess would be that the main bottleneck is the bandwidth for transferring data to/from the graphics card. Is that likely to be correct? In support of that, see this [Radeon HD 5450 review][1] - the memory bandwidth is only 12.8 GB/s. If you can't get data out of graphics memory quickly, you can't transfer it back to the system memory quickly. Apparently, that's slower than some top-end cards in 2002.

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  • Video Player/Library for Ubuntu with ratings and thumbs

    - by greggannicott
    I've just made the switch to Ubuntu on my main PC and I've been looking for a media player that can: Play all the usual video formats Rate (and ideally, tag) each file Display thumbnails for each file Other than that there isn't much I'm after. Banshee comes close, but doesn't display thumbnails. I've Google'd lots but I'm running out of search terms to try. Does anyone have any suggestions? Cheers!

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  • Be your own cloud [closed]

    - by Jedi
    I have reasonably many electronic gadgets that can go LAN or WI-FI. But how do you share and/or syncronize all your files among them? Well, between my laptops and my desktop I use Dropbox. A nice way to share files among computers. But what if your HDD on your laptop is not large enough to carry music, pictures and films. Normally you would buy an extern USB HDD and store them there, but then you cannot reach the files from other computers which are not connected to the USB device. Many would say I should use a solution like a cloud with a disc station or something like that. But my needs are follows: A mass storage which can be reached among devices (laptops, desktops, iPhone, Android phone, XBox or Playstation). Has low power requirements and is silent. Can be reached inside home and it would be nice if it could be reached outside home as well. Cheap I have looked around and I have found an wireless router which can share a USB device: D-Link Wireless N HD Media Router. I thought it would be an interesting solution for a simple local cloud solution. D-Link uses a little program called SharePort Plus which mount the USB device to your computer. Unfortunately is the transfer rate to the USB storage device rather disappointing. The transfer rate was 5.8 Mbps even though the distance between the laptop and the router was 2 meter. The same is happening when I use cable from the computer to the router. Another thing is that SharePort Plus only allows one computer be connected to the device at a time. The last thing was something I could live with. I have search on the Internet for other solutions and found this video from Synology. I'm not sure if their solution is the right one. I think a disc station connected to my home LAN could the right solution. What have you done in your home to store and share files among your computers and game consoles?

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  • OpenVPN IPv6 over IPv4 tunnel

    - by user66779
    Today I installed OpenVPN 2.3rc2 on both my windows 7 client machine and centos 6 server. This new version of OpenVPN provides full compatibility for IPv6. The Problem: I am currently able to connect to the server (through the IPv4 tunnel) and ping the IPv6 address which is assigned to my client and I can also ping the tun0 interface on the server. However, I cannot browse to any IPv6 websites. My vps provider has given me this: 2607:f840:0044:0022:0000:0000:0000:0000/64 is routed to this server (2607:f840:0:3f:0:0:0:eda). This is ifconfig after setup with OpenVPN running: eth0 Link encap:Ethernet HWaddr 00:16:3E:12:77:54 inet addr:208.111.39.160 Bcast:208.111.39.255 Mask:255.255.255.0 inet6 addr: 2607:f740:0:3f::eda/64 Scope:Global inet6 addr: fe80::216:3eff:fe12:7754/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2317253 errors:0 dropped:7263 overruns:0 frame:0 TX packets:1977414 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1696120096 (1.5 GiB) TX bytes:1735352992 (1.6 GiB) Interrupt:29 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:10.8.0.1 P-t-P:10.8.0.2 Mask:255.255.255.255 inet6 addr: 2607:f740:44:22::1/64 Scope:Global UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1 RX packets:739567 errors:0 dropped:0 overruns:0 frame:0 TX packets:1218240 errors:0 dropped:1542 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:46512557 (44.3 MiB) TX bytes:1559930874 (1.4 GiB) So OpenVPN is sucessfully creating a tun0 interface and assigning clients IPv6 addresses using 2607:f840:44:22::/64. The first client to connect is getting 2607:f840:44:22::1000 and the second 2607:f840:44:22::1001, and so on... plus 1 each time. After connecting as the first client, I can ping from my windows client machine 2607:f740:44:22::1 and 2607:f740:44:22::1000. However, I have no access to IPv6 websites. I believe the problem is that the tun0 IPv6 addressees are not being forwarded to the eth0 interface. This is the firewall running on the server: #!/bin/sh # # iptables configuration script # # Flush all current rules from iptables # iptables -F iptables -t nat -F # # Allow SSH connections on tcp port 22 # iptables -A INPUT -i eth0 -p tcp --dport 22 -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 22 -j ACCEPT # # Set access for localhost # iptables -A INPUT -i lo -j ACCEPT # # Accept connections on 1195 for vpn access from client # iptables -A INPUT -i eth0 -p udp --dport 1195 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p udp --sport 1195 -m state --state ESTABLISHED -j ACCEPT # # Apply forwarding for OpenVPN Tunneling # iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -s 10.8.0.0/24 -j ACCEPT iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to 209.111.39.160 iptables -A FORWARD -j REJECT # # Enable forwarding # echo 1 > /proc/sys/net/ipv4/ip_forward # # Set default policies for INPUT, FORWARD and OUTPUT chains # iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT # # IPv6 # IP6TABLES=/sbin/ip6tables $IP6TABLES -F INPUT $IP6TABLES -F FORWARD $IP6TABLES -F OUTPUT echo -n "1" >/proc/sys/net/ipv6/conf/all/forwarding echo -n "1" >/proc/sys/net/ipv6/conf/all/proxy_ndp echo -n "0" >/proc/sys/net/ipv6/conf/all/autoconf echo -n "0" >/proc/sys/net/ipv6/conf/all/accept_ra $IP6TABLES -A INPUT -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT $IP6TABLES -A INPUT -i eth0 -p tcp --dport 22 -j ACCEPT $IP6TABLES -A INPUT -i eth0 -p icmpv6 -j ACCEPT $IP6TABLES -P INPUT ACCEPT $IP6TABLES -P FORWARD ACCEPT $IP6TABLES -P OUTPUT ACCEPT Server.conf: server-ipv6 2607:f840:44:22::/64 server 10.8.0.0 255.255.255.0 port 1195 proto udp dev tun ca ca.crt cert server.crt key server.key dh dh2048.pem ifconfig-pool-persist ipp.txt push "redirect-gateway def1 bypass-dhcp" push "dhcp-option DNS 208.67.222.222" push "dhcp-option DNS 208.67.220.220" keepalive 10 60 tls-auth ta.key 0 cipher AES-256-CBC comp-lzo user nobody group nobody persist-key persist-tun status openvpn-status.log log-append openvpn.log verb 5 Client.conf: client dev tun nobind keepalive 10 60 hand-window 15 remote 209.111.39.160 1195 udp persist-key persist-tun ca ca.crt key client1.key cert client1.crt remote-cert-tls server tls-auth ta.key 1 comp-lzo verb 3 cipher AES-256-CBC I'm not sure where I am going wrong, it could be the firewall, or something missing from server or client.conf. This version of OpenVPN was only released yesterday, and there's little info on the internet about how to setup an IPv6 over IPv4 vpn tunnel. I've read the manual for this new version of OpenVPN (parts pertaining to IPv6) and it provides very little info too. Thanks for any help.

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  • Does a USB hub affect performance?

    - by user1018733
    I have two devices I want maximum throughput and latency with. (Midi drums and midi keyboard for example) Would connecting both to the same USB port via a hub effectively limit the maximum data transfer rate to 1/2 to each of them? I am assuming yes, but I didn't know if USB hubs had a handshaking and priority giving protocol available (e.g. let the device with the longer built up buffer of data communicate first) Thanks

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  • Annoying behavior from BitTorrent

    - by Click Upvote
    I'm trying to download a file via bittorent and experiencing a very annoying issue. Everytime I start downloading, the download rate varies between 40-50KB and stays at that for roughly a minute, before it starts to go down until it eventually gets as low as 2-3KB. If I exit and restart Bittorent it starts from 40-50KB again. What on earth is the reason for this? It seems like a pattern rather than the random fluctuation of seeds/peers leaving.

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  • What do I need to change to get this 'acts_as_rateable' Rails plugin working with this code from the

    - by tepidsam
    Hello! I'm working my way through the 'Foundation Rails 2' book. In Chapter 9, we are building a little "plugins" app. In the book, he installs the acts_as_rateable plugin found at http://juixe.com/svn/acts_as_rateable. This plugin doesn't appear to exist in 2010 (the page for this "old" plugin seems to be working again...it was down when I tried it earlier), so I found another acts_as_rateable plugin at http://github.com/azabaj/acts_as_rateable. These plugins are different and I'm trying to get the "new" plugin working with the code/project/app from the Foudations 2 book. I was able to use the migration generator included with the "new" plugin and it worked. Now,though, I'm a bit confused. In the book, he has us create a new controller to work with the plugin (the old plugin). Here's the code for that: class RatingsController < ApplicationController def create @plugin = Plugin.find(params[:plugin_id]) rating = Rating.new(:rating => params[:rating]) @plugin.ratings << average_rating redirect_to @plugin end end Then he had us change the routing: map.resources :plugins, :has_many => :ratings map.resources :categories map.root :controller => 'plugins' Next, we modified the following to the 'show' template so that it looks like this: <div id="rate_plugin"> <h2>Rate this plugin</h2> <ul class="star-rating"> <li> <%= link_to "1", @plugin.rate_it(1), :method => :post, :title => "1 star out of 5", :class => "one-star" %> </li> <li> <%= link_to "2", plugin_ratings_path(@plugin, :rating => 2), :method => :post, :title => "2 stars out of 5", :class => "two-stars" %> </li> <li> <%= link_to "3", plugin_ratings_path(@plugin, :rating => 3), :method => :post, :title => "3 stars out of 5", :class => "three-stars" %> </li> <li> <%= link_to "4", plugin_ratings_path(@plugin, :rating => 4), :method => :post, :title => "4 stars out of 5", :class => "four-stars" %> </li> <li> <%= link_to "5", plugin_ratings_path(@plugin, :rating => 5), :method => :post, :title => "5 stars out of 5", :class => "five-stars" %> </li> </ul> </div> The problem is that we're using code for a different plugin. When I try to actually "rate" one of the plugins, I get an "unknown attribute" error. That makes sense. I'm using attribute names for the "old" plugin, but I should be using attributes names for the "new" plugin. The problem is...I've tried using a variety of different attribute names and I keep getting the same error. From the README for the "new" plugin, I think I should be using some of these but I haven't been able to get them working: Install the plugin into your vendor/plugins directory, insert 'acts_as_rateable' into your model, then restart your application. class Post < ActiveRecord::Base acts_as_rateable end Now your model is extended by the plugin, you can rate it ( 1-# )or calculate the average rating. @plugin.rate_it( 4, current_user.id ) @plugin.average_rating #=> 4.0 @plugin.average_rating_round #=> 4 @plugin.average_rating_percent #=> 80 @plugin.rated_by?( current_user ) #=> rating || false Plugin.find_average_of( 4 ) #=> array of posts See acts_as_rateable.rb for further details! I'm guessing that I might have to make some "bigger" changes to get this plugin working. I'm asking this question to learn and only learn. The book gives code to get things working with the old plugin, but if one were actually building this app today it would be necessary to use this "new" plugin, so I would like to see how it could be used. Cheers! Any ideas on what I could change to get the "new" plugin working?

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  • Detection of battery status totally messed up

    - by Faabiioo
    I already posted this question in the Ubuntu forum and stackOverflow. I forward it here with the hope to find some different opinions about the problem. I have an Acer TravelMate 5730, which is 3 y.o., running Ubuntu 10.04 LTS. One year ago I changed the battery because the old one died. Since then, everything worked like a charm. A week ago I was using my laptop running on battery; it was charged up to 60%. Suddenly it shut down and for about 24h it was like the battery was totally broken: it didn't charge anymore and the 'upower --dump' said state: critical. I was kind of resigned to buy a new battery, when suddenly the orange light became green: battery was charged and actually working; strangely the battery indicator was stuck to 100%, even after 2 hours running. I tried again with 'upower --dump' or 'acpi -b' commands and it kept saying battery is discharging, though maintaining the percentage to 100%. Thus, battery working fine up to 3 hours, without any warning when it was almost empty, likely to result in a brute shut down. Today something different. the 'upower --dump' command says: ... present: yes rechargeable: yes state: fully-charged energy: 0 Wh energy-empty: 0 Wh energy-full: 65.12 Wh energy-full-design: 65.12 Wh energy-rate: 0 W voltage: 14.481 V percentage: 0% capacity: 100% technology: lithium-ion I tried to boot WinXP and the problem is pretty much the same, with the battery fully-charged, percentage equal to 0% and no way to fix it. While writing, the situation has changed again: present: yes rechargeable: yes state: charging energy: 0 Wh energy-empty: 0 Wh energy-full: 65.12 Wh energy-full-design: 65.12 Wh energy-rate: 0 W voltage: 14.474 V percentage: 0% capacity: 100% technology: lithium-ion ...charging, but it does not charge up. (Recall, the battery lasted 3 hours until yesterday!). So, the big question is: is it an hardware issue, like a dedicated internal circuit is broken? or maybe it is just the battery that must be changed. Or, rather, some BIOS problem that could be fixed in some way. I'd appreciate every help that can shed some light on this annoying problem thanks

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  • Apache's htcacheclean doesn't scale: How to tame a huge Apache disk_cache?

    - by flight
    We have an Apache setup with a huge disk_cache (500.000 entries, 50 GB disk space used). The cache grows by 16 GB every day. My problem is that the cache seems to be growing nearly as fast as it's possible to remove files and directories from the cache filesystem! The cache partition is an ext3 filesystem (100GB, "-t news") on an iSCSI storage. The Apache server (which acts as a caching proxy) is a VM. The disk_cache is configured with CacheDirLevels=2 and CacheDirLength=1, and includes variants. A typical file path is "/htcache/B/x/i_iGfmmHhxJRheg8NHcQ.header.vary/A/W/oGX3MAV3q0bWl30YmA_A.header". When I try to call htcacheclean to tame the cache (non-daemon mode, "htcacheclean-t -p/htcache -l15G"), IOwait is going through the roof for several hours. Without any visible action. Only after hours, htcacheclean starts to delete files from the cache partition, which takes a couple more hours. (A similar problem was brought up in the Apache mailing list in 2009, without a solution: http://www.mail-archive.com/[email protected]/msg42683.html) The high IOwait leads to problems with the stability of the web server (the bridge to the Tomcat backend server sometimes stalls). I came up with my own prune script, which removes files and directories from random subdirectories of the cache. Only to find that the deletion rate of the script is just slightly higher than the cache growth rate. The script takes ~10 seconds to read the a subdirectory (e.g. /htcache/B/x) and frees some 5 MB of disk space. In this 10 seconds, the cache has grown by another 2 MB. As with htcacheclean, IOwait goes up to 25% when running the prune script continuously. Any idea? Is this a problem specific to the (rather slow) iSCSI storage? Should I choose a different file system for a huge disk_cache? ext2? ext4? Are there any kernel parameter optimizations for this kind of scenario? (I already tried the deadline scheduler and a smaller read_ahead_kb, without effect).

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  • Why is my concurrency capacity so low for my web app on a LAMP EC2 instance?

    - by AMF
    I come from a web developer background and have been humming along building my PHP app, using the CakePHP framework. The problem arose when I began the ab (Apache Bench) testing on the Amazon EC2 instance in which the app resides. I'm getting pretty horrendous average page load times, even though I'm running a c1.medium instance (2 cores, 2GB RAM), and I think I'm doing everything right. I would run: ab -n 200 -c 20 http://localhost/heavy-but-view-cached-page.php Here are the results: Concurrency Level: 20 Time taken for tests: 48.197 seconds Complete requests: 200 Failed requests: 0 Write errors: 0 Total transferred: 392111200 bytes HTML transferred: 392047600 bytes Requests per second: 4.15 [#/sec] (mean) Time per request: 4819.723 [ms] (mean) Time per request: 240.986 [ms] (mean, across all concurrent requests) Transfer rate: 7944.88 [Kbytes/sec] received While the ab test is running, I run VMStat, which shows that Swap stays at 0, CPU is constantly at 80-100% (although I'm not sure I can trust this on a VM), RAM utilization ramps up to about 1.6G (leaving 400M free). Load goes up to about 8 and site slows to a crawl. Here's what I think I'm doing right on the code side: In Chrome browser uncached pages typically load in 800-1000ms, and cached pages load in 300-500ms. Not stunning, but not terrible either. Thanks to view caching, there might be at most one DB query per page-load to write session data. So we can rule out a DB bottleneck. I have APC on. I am using Memcached to serve the view cache and other site caches. xhprof code profiler shows that cached pages take up 10MB-40MB in memory and 100ms - 1000ms in wall time. Pages that would be the worst offenders would look something like this in xhprof: Total Incl. Wall Time (microsec): 330,143 microsecs Total Incl. CPU (microsecs): 320,019 microsecs Total Incl. MemUse (bytes): 36,786,192 bytes Total Incl. PeakMemUse (bytes): 46,667,008 bytes Number of Function Calls: 5,195 My Apache config: KeepAlive On MaxKeepAliveRequests 100 KeepAliveTimeout 3 <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 MaxClients 120 MaxRequestsPerChild 1000 </IfModule> Is there something wrong with the server? Some gotcha with the EC2? Or is it my code? Some obvious setting I should look into? Too many DNS lookups? What am I missing? I really want to get to 1,000 concurrency capacity, but at this rate, it ain't gonna happen.

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  • Video Player/Library for Ubuntu with ratings and thumbs

    - by greggannicott
    Hi. I've just made the switch to Ubuntu on my main PC and I've been looking for a media player that can: Play all the usual video formats Rate (and ideally, tag) each file Display thumbnails for each file Other than that there isn't much I'm after. Banshee comes close, but doesn't display thumbnails. I've Google'd lots but I'm running out of search terms to try. Does anyone have any suggestions? Cheers!

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