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• Is there a path from OpenSCAD to WebGL?

  - by Andrew Domaszek

  tl;dr version, Does a software path exist to convert from openscad input to render on a website via webgl? What I'm trying to do is display OpenSCAD created designs uploaded via post on a LEMPy driven website; this is currently done by outputting to a static png image. I would like to render one of openscad's export formats(wikibooks) and convert for display in javascript/webgl through some software path available via linux batch. CPU and RAM are relatively unconstrained but no GPU available. I've looked into CopperLeicht, but it requires CopperCube output which would require windows or wine. FOSS is preferred but not required. edit: I found three.js has converters for fbx, dae, obj, and 3ds formats which might be helpful as one of the last steps.

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• Is Gadget on Windows 7 buggy for now?

  - by Jian Lin

  Is Gadget on Windows 7 buggy for now? For example, I made CPU Meter, Clock "always on top", but sometimes, one is on top but the other is not. I have to make it "not always on top" and then "always on top" again and it will show up on top again. another thing that might or might not be a bug is: even when viewing video in full screen mode, the gadgets are all there. This may be one case where the user won't want all the gadgets on top when viewing a video full screen.

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• Why Matlab in screen in Linux on PuTTY terminates itself after closing PuTTY session?

  - by Karl

  I connected to a linux server with PuTTY and start a screen session, and start matlab with: matlab -nodesktop Then, I run my matlab code as usual. The code will run for hours. So to test whether screen works, I start another PuTTY session and run top. Then, I close PuTTY session with still-running Matlab (top shows Matlab at 100% CPU usage) in screen. To my surprise, my Matlab process vanished after I close the aforementioned session. I've tried this a few times, and it seems the same thing happened. screen -ls shows that my screens are there but detached. top also shows that my matlab is not there. What might be the possible cause of this? Doesn't screen normally should keep on running even I terminate my PuTTY session?

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• How can artificially create a slow query in mysql?

  - by Gray Race

  I'm giving a hands on presentation in a couple weeks. Part of this demo is for basic mysql trouble shooting including use of the slow query log. I've generated a database and installed our app but its a clean database and therefore difficult to generate enough problems. I've tried the following to get queries in the slow query log: Set slow query time to 1 second. Deleted multiple indexes. Stressed the system: stress --cpu 100 --io 100 --vm 2 --vm-bytes 128M --timeout 1m Scripted some basic webpage calls using wget. None of this has generated slow queries. Is there another way of artificially stressing the database to generate problems? I don't have enough skills to write a complex Jmeter or other load generator. I'm hoping perhaps for something built into mysql or another linux trick beyond stress.

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• How do I make compiling code not bring my system to its knees?

  - by Jason Baker

  I have a macbook with snow leopard and 2 gigs of RAM. When I compile C or C++ code, my system becomes all but unusable. For instance, when I compile llvm I notice that there are about 10 or 11 processes (cc1plus) getting launched at a time that suck up my CPU time and memory. Is there any way to maybe make it compile less at one time? I'll gladly wait a while longer to have my system usable while I'm compiling. Or is this something that you just have to live with when compiling C or C++?

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• How can I set the fan speed to 100% on a laptop?

  - by Codemonkey

  I recently purchased a HP Pavilion dv7-4031. When it's cool, it works smoothly and efficiently. However when CPU and GUP temperatures reach 60c and above, the PC starts freezing up and stuttering. I can hear that the fan speeds steadily increase all the way up to 70-80c. This is what pisses me off: I want the fan speeds to run 100% all the time, perhaps preventing the high temperatures in the first place. The way it is now, fan speeds only increase to keep internal temperatures at above 60c. I've searched all over for any sort of speed control, finding nothing. Any help appreciated. I have tried Speedfan. In "Fans" there is nothing listed. I took that as a bad sign. The BIOS is pathetic, and only has 4 or 5 changeable settings, including "Quickstart" and "Boot order"

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• Determining Performance Limits

  - by JeffV

  I have a number of windows processes that pass messages between them hat a high rate using tcp to local host. Aside from testing on actual hardware how can I assess what my hardware limit will be. These applications are not doing CPU intensive work, mostly decomposing and combining messages, scanning over them for special flag in the data etc.. The message size is typically 3k and the rate is typically ~10k messages per second. ~30MB per second between processing stages. There may be 10 or more stages depending. For this type of application, what should I look to for assessing performance? What do I look for in a server performance wise? I am currently running an XEON L5408 with 32 GB ram. But I am assuming cache is more important than actual ram size as I am barely touching the ram.

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• Computer Randomly Restarts (no crash dump)

  - by Bruno Charters

  Hey everyone this is my first time here, so, my computer got pulled out of his place the other day by accident and it never got back to working decently ever again. I just stopped using it because everytime i power it on, it restarts. Some times it doesn't even reach the desktop, others it even allows me to run a game or something. It gets really random. Today i was trying my last attempt before sending it to fix and it ran fine for 40 minutes but as i tried to run a game the screen got really messeud up full of colorful lines and stuff and i'm assuming it had to do with the graphics card. Altho, my question is, what can be causing all this restart thingie? Can it be just the Power Supply failing me and hence, not giving enough power to make the graphic card go for instance? My computer specs are: Motherboard: Asus P5KPL - AM CPU: Intel QuadCore 2.33 ghz Graphic Card: Nvidia GeForce GTS260 Ram: 2x2gb ddr2 Power Supply: Nox Urano 500W Thanks in advance, Bruno Charters

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• Computer not displaying anything

  - by Justen

  The computer in question worked last week. It's brand new, never been connected to the internet, up-to-date parts, etc. Last week, I installed some 3D software on it, then shut it down and waited for the license files that arrived this week. I've done this to 4 other PCs with the same hardware and software. I've tried: Hooking it up to 3 different monitors using different video cables 2 other graphics cards and a handful of other things like switching which port it's plugged into before and after a restart. I have the driver disc, and a windows reinstallation disc, but they won't do me any good because no display at all for any interval of time. All the fans are moving: psu, gfx, cpu etc, so I don't believe it's a power issue. Here are the specs I know of: 4GB RAM 8800 GTX 700w PSU Intel dual core (not sure of model) Anyways, I'm open to ideas.

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• Why is the latency on one LVM volume consistently higher?

  - by David Schmitt

  I've got a server with LVM over RAID1. One of the volumes has a consistently higher IO latency (as measured by the diskstats_latency munin plugin) than the other volumes from the same group. As you can see, the dark orange /root volume has consistently high IO latency. Actually ten times the average latency of the physical devices. It also has the highest Min and Max values. My main concern are not the peaks, which occur under high load, but the constant load on (semi-)idle. The server is running Debian Squeeze with the VServer kernel and has four VServer containers and one KVM guest. I'm looking for ways to fix - or at least understand - this situation. Here're some parts of the system configuration: root@kvmhost2:~# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/system--host-root 19G 3.8G 14G 22% / tmpfs 16G 0 16G 0% /lib/init/rw udev 16G 224K 16G 1% /dev tmpfs 16G 0 16G 0% /dev/shm /dev/md0 942M 37M 858M 5% /boot /dev/mapper/system--host-isos 28G 19G 8.1G 70% /srv/isos /dev/mapper/system--host-vs_a 30G 23G 6.0G 79% /var/lib/vservers/a /dev/mapper/system--host-vs_b 5.0G 594M 4.1G 13% /var/lib/vservers/b /dev/mapper/system--host-vs_c 5.0G 555M 4.2G 12% /var/lib/vservers/c /dev/loop0 4.4G 4.4G 0 100% /media/debian-6.0.0-amd64-DVD-1 /dev/loop1 4.4G 4.4G 0 100% /media/debian-6.0.0-i386-DVD-1 /dev/mapper/system--host-vs_d 74G 55G 16G 78% /var/lib/vservers/d root@kvmhost2:~# cat /proc/mounts rootfs / rootfs rw 0 0 none /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0 none /proc proc rw,nosuid,nodev,noexec,relatime 0 0 none /dev devtmpfs rw,relatime,size=16500836k,nr_inodes=4125209,mode=755 0 0 none /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0 /dev/mapper/system--host-root / ext3 rw,relatime,errors=remount-ro,data=ordered 0 0 tmpfs /lib/init/rw tmpfs rw,nosuid,relatime,mode=755 0 0 tmpfs /dev/shm tmpfs rw,nosuid,nodev,relatime 0 0 fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0 /dev/md0 /boot ext3 rw,sync,relatime,errors=continue,data=ordered 0 0 /dev/mapper/system--host-isos /srv/isos ext3 rw,relatime,errors=continue,data=ordered 0 0 /dev/mapper/system--host-vs_a /var/lib/vservers/a ext3 rw,relatime,errors=continue,data=ordered 0 0 /dev/mapper/system--host-vs_b /var/lib/vservers/b ext3 rw,relatime,errors=continue,data=ordered 0 0 /dev/mapper/system--host-vs_c /var/lib/vservers/c ext3 rw,relatime,errors=continue,data=ordered 0 0 /dev/loop0 /media/debian-6.0.0-amd64-DVD-1 iso9660 ro,relatime 0 0 /dev/loop1 /media/debian-6.0.0-i386-DVD-1 iso9660 ro,relatime 0 0 /dev/mapper/system--host-vs_d /var/lib/vservers/d ext3 rw,relatime,errors=continue,data=ordered 0 0 root@kvmhost2:~# cat /proc/mdstat Personalities : [raid1] md1 : active raid1 sda2[0] sdb2[1] 975779968 blocks [2/2] [UU] md0 : active raid1 sda1[0] sdb1[1] 979840 blocks [2/2] [UU] unused devices: <none> root@kvmhost2:~# iostat -x Linux 2.6.32-5-vserver-amd64 (kvmhost2) 06/28/2012 _x86_64_ (8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 3.09 0.14 2.92 1.51 0.00 92.35 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 23.25 161.12 7.46 37.90 855.27 1596.62 54.05 0.13 2.80 1.76 8.00 sdb 22.82 161.36 7.36 37.66 850.29 1596.62 54.35 0.54 12.01 1.80 8.09 md0 0.00 0.00 0.00 0.00 0.14 0.02 38.44 0.00 0.00 0.00 0.00 md1 0.00 0.00 53.55 198.16 768.01 1585.25 9.35 0.00 0.00 0.00 0.00 dm-0 0.00 0.00 0.48 20.21 16.70 161.71 8.62 0.26 12.72 0.77 1.60 dm-1 0.00 0.00 3.62 10.03 28.94 80.21 8.00 0.19 13.68 1.59 2.17 dm-2 0.00 0.00 0.00 0.00 0.00 0.00 9.17 0.00 9.64 6.42 0.00 dm-3 0.00 0.00 6.73 0.41 53.87 3.28 8.00 0.02 3.44 0.12 0.09 dm-4 0.00 0.00 17.45 18.18 139.57 145.47 8.00 0.42 11.81 0.76 2.69 dm-5 0.00 0.00 2.50 46.38 120.50 371.07 10.06 0.69 14.20 0.46 2.26 dm-6 0.00 0.00 0.02 0.10 0.67 0.81 12.53 0.01 75.53 18.58 0.22 dm-7 0.00 0.00 0.00 0.00 0.00 0.00 7.99 0.00 11.24 9.45 0.00 dm-8 0.00 0.00 22.69 102.76 407.25 822.09 9.80 0.97 7.71 0.39 4.95 dm-9 0.00 0.00 0.06 0.08 0.50 0.62 8.00 0.07 481.23 11.72 0.16 root@kvmhost2:~# ls -l /dev/mapper/ total 0 crw------- 1 root root 10, 59 May 11 11:19 control lrwxrwxrwx 1 root root 7 Jun 5 15:08 system--host-kvm1 -> ../dm-4 lrwxrwxrwx 1 root root 7 Jun 5 15:08 system--host-kvm2 -> ../dm-3 lrwxrwxrwx 1 root root 7 Jun 5 15:06 system--host-isos -> ../dm-2 lrwxrwxrwx 1 root root 7 May 11 11:19 system--host-root -> ../dm-0 lrwxrwxrwx 1 root root 7 Jun 5 15:06 system--host-swap -> ../dm-9 lrwxrwxrwx 1 root root 7 Jun 5 15:06 system--host-vs_d -> ../dm-8 lrwxrwxrwx 1 root root 7 Jun 5 15:06 system--host-vs_b -> ../dm-6 lrwxrwxrwx 1 root root 7 Jun 5 15:06 system--host-vs_c -> ../dm-7 lrwxrwxrwx 1 root root 7 Jun 5 15:06 system--host-vs_a -> ../dm-5 lrwxrwxrwx 1 root root 7 Jun 5 15:08 system--host-kvm3 -> ../dm-1 root@kvmhost2:~#

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• How can I log all traffic with its exact length?

  - by Legate

  I want to process all packets with their size going through our gateway server (running Debian 4.0). My idea is to use tcpdump, but I have two questions. The command I'm currently thinking of is tcpdump -i iface -n -t -q. Is it guaranteed that tcpdump will process all packets? What happens if the CPU is working to full capacity? The format of the output lines is IP ddd.ddd.ddd.ddd.port > ddd.ddd.ddd.ddd.port: tcp 1260. What exactly is 1260? I have the suspicion that it is the payload in bytes of the packet, which would be exactly what I need, but I'm not sure. It might be the TCP Window Size. Or perhaps there is an even better way of doing this? I thought about a LOG rule in iptables, but tcpdump seems easier and I don't know whether iptables can log the packet lengths.

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• Where lies the soul of a computer?

  - by Christian

  When you take the system drive and put it in a new box, do you rename it or do you keep the name? And when you put a fresh drive in the old box, do you give it a new name? What is with upgrading? How many of the components do you have to change until a computer loses its identity? So a CPU is often described as the heart or the brain of a computer but where lies its soul? What determines its identity? The data on the system drive? The majority of its components? This might sound like a not-so-serious question and it probably is but whom of you didn't already face this problem?

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• Xinetd , vncserver memory requirement

  - by JP19

  Hi, I am installing the following on a low memory system: vnc4server xinetd xterm openbox obconf I will only occasionally be logging into the vncs for some admin work. My question is: 1) Does xinetd take memory / cpu even when vncserver is not running? If so, can I "run" xinetd on demand (how)? And if no, any idea how much memory it will take when vncserver is not running? 2) Does vncserver take substantial memory when no clients are connected? 3) Do openbox/obconf take memory when vncserver is running but no client are connected? 4) Do openbox/obconf take memory when no vncserver is running? thanks JP

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• Why did my laptop turn off?

  - by darenw

  Normally I can slip my running laptop into a backpack, go somewhere, and if it's no more than about half an hour later, it'll still be running. At the destination I plug in the AC power unit and all is well. I run it off of the AC unit before and after the trip, have the screen at less than full backlight brightness, and don't have any peripherals that burn power. Sometimes the wireless switch accidentally slides in the backpack, and that causes extra power to be used and the laptop dies before I reach the destination. Sad, but so be it. But sometimes the wireless switch is off, I've reached the destination in less than 30 minutes (typically 10-20 min), and I know the battery was fully charged, yet the machine is off. Is there a way to determine, after the fact, why the machine shut itself off? I'm running Linux on a fairly powerful Gateway with 4GB RAM, fancy nvidia graphics, dual core cpu, chosen more for number crunching power than battery life, but should last easily for half an hour if not an hour.

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• Nginx Static Content Server Maxing Out?

  - by Harry

  I use nginx to serve the static content for a decently busy website of mine. I have the logging disabled, and 4 worker processes enabled with 5,000 connections per worker (which should yield a max connection limit of 20,000. The server is only operating at about 10% CPU usage and 50% ram, but it's very laggy, and sometimes nginx is so slow to respond to the requests, it times out. For a small number of connections, it's fine, but once any load starts occurring (~2,500 connections), it backs up and bogs down. Is there any other bottlenecks or limits that I might be hitting? This is a FreeBSD server, and all the static files are located locally (not NFS). The NIC is an unmetered gigabit, and it's only using around 75 megabit. Any insight would be appreciated. Thanks.

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• AMD Phenom II X4 965 crossfire motherboard

  - by Nick

  I am trying to build a cheap mining rig. I wanted to use the AMD Phenom II X4 965 (HDZ965FBGMBOX) processor as it got very good reviews and benchmarks, and is inexpensive. However, I am having trouble finding motherboards with crossfire support for 2 GPUs. AMD's website only lists five compatible motherboards, of which only one has crossfire support. Worse, it is expensive and seems to be obsolete and no longer available. I have trouble believing that there are only five compatible motherboards for that CPU. Are there any low-end motherboards that are both compatible with the AMD Phenom II X4 965 and have CrossFire support? (Is there a way to find this sort of information, like a central site that lists motherboards and their technical specifications?)

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• Asus z53 laptop overheating problem

  - by Tiberiu Hajas

  hi all, wondering if anyone encountered overheating of asus laptop ? especially the z53 model ? usually the right side of the laptop and vent in the upper corner is blowing hot air when under even minimal load, the CPU temperature can easily get to 65-70C and GPU is even above 80C. I'm using NHC (notebook health control) to set to a higher conservatory power consumption but that helps only a bit, anyone opened up the case ? wondering is require a dust clean ...etc ? I still have some warranty on it. thanks

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• Large concurrent user performance issues for Apache + mod_jk + GlassFish v3.1 clusters

  - by user10035

  I am running a java ee 6 ear application on a GlassFish v3.1 ( 2 clusters with 2 instances each) load balanced by an Apache v2.2 with mod_jk - all on the same server (Windows Server 2003 R2, Intel Xeon CPU x5670 @2.93Ghz, 6GB RAM, 2 cpus). The web application is accessed by around ~100 users. When they all try to access it at the same time every morning ~8am, the response is very slow while trying to access the main jsf home page. Apart from that I have seen the CPU usage spike upto 99% by the httpd process during the day frequently and I start seeing errors in the mod_jk.log file. [Wed Jun 08 08:25:43 2011] [9380:8216] [info] ajp_process_callback::jk_ajp_common.c (1885): Writing to client aborted or client network problems [Wed Jun 08 08:25:43 2011] [9380:8216] [info] ajp_service::jk_ajp_common.c (2543): (myAppLocalInstance4) sending request to tomcat failed (unrecoverable), because of client write error (attempt=1) Any suggestions on how I can go about improving this? Apache configuration is mostly the default as shown below ServerRoot "C:/Program Files/Apache Software Foundation/Apache2.2" Listen 80 LoadModule actions_module modules/mod_actions.so LoadModule alias_module modules/mod_alias.so LoadModule asis_module modules/mod_asis.so LoadModule auth_basic_module modules/mod_auth_basic.so LoadModule authn_default_module modules/mod_authn_default.so LoadModule authn_file_module modules/mod_authn_file.so LoadModule authz_default_module modules/mod_authz_default.so LoadModule authz_groupfile_module modules/mod_authz_groupfile.so LoadModule authz_host_module modules/mod_authz_host.so LoadModule authz_user_module modules/mod_authz_user.so LoadModule autoindex_module modules/mod_autoindex.so LoadModule cgi_module modules/mod_cgi.so LoadModule dir_module modules/mod_dir.so LoadModule env_module modules/mod_env.so LoadModule include_module modules/mod_include.so LoadModule isapi_module modules/mod_isapi.so LoadModule log_config_module modules/mod_log_config.so LoadModule mime_module modules/mod_mime.so LoadModule negotiation_module modules/mod_negotiation.so LoadModule setenvif_module modules/mod_setenvif.so <IfModule !mpm_netware_module> <IfModule !mpm_winnt_module> User daemon Group daemon </IfModule> </IfModule> DocumentRoot "C:/Program Files/Apache Software Foundation/Apache2.2/htdocs" <Directory /> Options FollowSymLinks AllowOverride None Order deny,allow Deny from all </Directory> <Directory "C:/Program Files/Apache Software Foundation/Apache2.2/htdocs"> Options Indexes FollowSymLinks AllowOverride None Order allow,deny Allow from all </Directory> <IfModule dir_module> DirectoryIndex index.html </IfModule> <FilesMatch "^\.ht"> Order allow,deny Deny from all Satisfy All </FilesMatch> ErrorLog "logs/error.log" LogLevel warn <IfModule log_config_module> LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %>s %b" common <IfModule logio_module> LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio </IfModule> CustomLog "logs/access.log" common </IfModule> <IfModule alias_module> ScriptAlias /cgi-bin/ "C:/Program Files/Apache Software Foundation/Apache2.2/cgi-bin/" </IfModule> <Directory "C:/Program Files/Apache Software Foundation/Apache2.2/cgi-bin"> AllowOverride None Options None Order allow,deny Allow from all </Directory> DefaultType text/plain <IfModule mime_module> TypesConfig conf/mime.types AddType application/x-compress .Z AddType application/x-gzip .gz .tgz </IfModule> Include conf/extra/httpd-mpm.conf <IfModule ssl_module> SSLRandomSeed startup builtin SSLRandomSeed connect builtin </IfModule> LoadModule jk_module modules/mod_jk.so JkWorkersFile conf/workers.properties JkLogFile logs/mod_jk.log JkLogLevel info JkLogStampFormat "[%a %b %d %H:%M:%S %Y] " JkOptions +ForwardKeySize +ForwardURICompat -ForwardDirectories JkRequestLogFormat "%w %V %T" JkMount /myApp/* loadbalancerLocal JkMount /myAppRemote/* loadbalancerRemote JkMount /myApp loadbalancerLocal JkMount /myAppRemote loadbalancerRemote The workers.properties config file is: worker.list=loadbalancerLocal,loadbalancerRemote worker.myAppLocalInstance1.type=ajp13 worker.myAppLocalInstance1.host=localhost worker.myAppLocalInstance1.port=8109 worker.myAppLocalInstance1.lbfactor=1 worker.myAppLocalInstance1.socket_keepalive=1 worker.myAppLocalInstance1.socket_timeout=1000 worker.myAppLocalInstance2.type=ajp13 worker.myAppLocalInstance2.host=localhost worker.myAppLocalInstance2.port=8209 worker.myAppLocalInstance2.lbfactor=1 worker.myAppLocalInstance2.socket_keepalive=1 worker.myAppLocalInstance2.socket_timeout=1000 worker.myAppLocalInstance3.type=ajp13 worker.myAppLocalInstance3.host=localhost worker.myAppLocalInstance3.port=8309 worker.myAppLocalInstance3.lbfactor=1 worker.myAppLocalInstance3.socket_keepalive=1 worker.myAppLocalInstance3.socket_timeout=1000 worker.myAppLocalInstance4.type=ajp13 worker.myAppLocalInstance4.host=localhost worker.myAppLocalInstance4.port=8409 worker.myAppLocalInstance4.lbfactor=1 worker.myAppLocalInstance4.socket_keepalive=1 worker.myAppLocalInstance4.socket_timeout=1000 worker.myAppRemoteInstance1.type=ajp13 worker.myAppRemoteInstance1.host=localhost worker.myAppRemoteInstance1.port=8509 worker.myAppRemoteInstance1.lbfactor=1 worker.myAppRemoteInstance1.socket_keepalive=1 worker.myAppRemoteInstance1.socket_timeout=1000 worker.myAppRemoteInstance2.type=ajp13 worker.myAppRemoteInstance2.host=localhost worker.myAppRemoteInstance2.port=8609 worker.myAppRemoteInstance2.lbfactor=1 worker.myAppRemoteInstance2.socket_keepalive=1 worker.myAppRemoteInstance2.socket_timeout=1000 worker.myAppRemoteInstance3.type=ajp13 worker.myAppRemoteInstance3.host=localhost worker.myAppRemoteInstance3.port=8709 worker.myAppRemoteInstance3.lbfactor=1 worker.myAppRemoteInstance3.socket_keepalive=1 worker.myAppRemoteInstance3.socket_timeout=1000 worker.myAppRemoteInstance4.type=ajp13 worker.myAppRemoteInstance4.host=localhost worker.myAppRemoteInstance4.port=8809 worker.myAppRemoteInstance4.lbfactor=1 worker.myAppRemoteInstance4.socket_keepalive=1 worker.myAppRemoteInstance4.socket_timeout=1000 worker.loadbalancerLocal.type=lb worker.loadbalancerLocal.sticky_session=True worker.loadbalancerLocal.balance_workers=myAppLocalInstance1,myAppLocalInstance2,myAppLocalInstance3,myAppLocalInstance4 worker.loadbalancerRemote.type=lb worker.loadbalancerRemote.balance_workers=myAppRemoteInstance1,myAppRemoteInstance2,myAppRemoteInstance3,myAppRemoteInstance4 worker.loadbalancerRemote.sticky_session=True

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• Reverse proxy 502 bad gateway

  - by Brian Graham

  I have setup a subdomain to proxy my plesk panel, but when saving pages I am getting 502 Bad Gateway error instead of a completion message. I am running CentOS 6. Here is my vhost.conf configuration for http://plesk.domain.tld/: RewriteEngine On RewriteCond %{SERVER_PORT} ^80$ RewriteRule $ https://plesk.domain.tld/ [R,L] Here is my vhost_ssl.conf configuration for https://plesk.domain.tld/: SSLProxyEngine On <Location /> ProxyPass https://localhost:8443/ ProxyPassReverse https://localhost:8443/ </Location> I have more than enough (and I have even checked) RAM, CPU and HDD. There are no spikes. As well, the posted information does save, it just errors when trying to show me a "This information has been saved." green/red block. Here is the relevent error from /var/log/nginx/error.log (IP/Host Filtered): 2014/05/29 02:42:41 [error] 8046#0: *402 upstream prematurely closed connection while reading response header from upstream, client: 173.238.XX.XX, server: plesk.domain.tld, request: "POST /smb/web/edit HTTP/1.1", upstream: "https://198.100.XX.XX:7081/smb/web/edit", host: "plesk.domain.tld", referrer: "https://plesk.domain.tld/smb/web/edit"

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• Cutting and pasting in MS Word: hourglass pops and it takes longer than expected

  - by Rax Olgud

  I work with MS Word 2007. Today I created a new document, and for some reason cutting and pasting text (using Ctrl-X and Ctrl-V) takes longer than expected. To clarify, here's the process: I select a single word in the document I click Ctrl-X The hourglass shows up for 1-2 seconds The word is cut The same happens for pasting (i.e. 1-2 seconds of hourglass). This document is ~5 pages long, with nothing fancy. I have plenty of available RAM and my CPU usage is around 1-2%, there's not peak during the cut/paste. Any thoughts on what can cause this and what I can do against it?

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• sound clipping in windows 7 64bit

  - by Sonic Soul

  something is up with 64 bit version of windows 7. i have 2 (good pro-sumer) sound cards which i've used in other version of windows 7 w/out problems, but now it is causing severe clipping (noise, sound having little gaps surrounded by static).. the cards i am using is echo mia, and native instruments audio kontrol 1. the audio kontrol 1 is a external card, and would work ok for a few hours after rebooting, and than it would go back into clipping mode, to the point where you tube videos would not play from trying to process sound and it stopping for extended periods of time. echo mia is performing better, but there is still some clipping and distortion. the machine i use is newly built, with i7 920 64 bit cpu, 6 gigs of ram and an outdated nvidia video card (geforece 7950 gx2)

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• Mixing RAM brands

  - by Andy

  Hey guys, I'm scheduled to install a server at a colo facility tomorrow, but I've hit a snag. ESXi doesn't like the fact that I have 12GB ram in my server (8gb on one side of CPU, 4gb on the other). I currently have 3xCrucial 4gb ECC DDR3 1333mhz sticks (http://www.amazon.com/gp/product/B001TGT7EE/ref=oss_product) and I'm planning on stopping by Fry's on the way to the colo facility so I can pick up another stick so that ESXi will install. Problem is, Fry's doesn't stock Crucial RAM. They do have a stick that I think is identical to my crucial one: http://www.frys.com/product/5915524?site=sr:SEARCH:MAIN_RSLT_PG Will this be dangerous to use in my server? The specs on the RAM are the same as far as I know (ecc registered, 1333mhz, ddr3, 4gb).

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• Click sound from computer when shut down

  - by user32569

  Hi, I build my new computer yesterday and I noticed, when computer is shut down, I mean the exact time its looses power from PSU, relativelly loud CLICK sound occurs. Please does anyone knows from where? I think MB, SSD, VGA, CPU nor coolers are not cousing this. I would guess maybe Samsung 1TB HDD (maybe when heads go back to LZ) or some hard safety switch or relay in PSU? Or just the MB speaker? (Yes, its actually installed). Do you have any experience with this? Thanks.

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• AWS Elastic load balancer doesn't decrease instances from Alarm Trigger

  - by jchysk

  I have a load balancer that I created an auto-scaling-group and launch-config for. I created the auto-scaling-group with a min-size of 1 and max size of 20. I have a scaledown policy: as-put-scaling-policy SBMScaleDownPolicy --auto-scaling-group SBMAutoScaleGroup --adjustment=-1 --type ChangeInCapacity --cooldown 300 Then I set up an alarm: mon-put-metric-alarm SBMLowCPUAlarm --comparison-operator LessThanThreshold --evaluation-periods 1 --metric-name CPUUtilization --namespace "AWS/EC2" --period 600 --statistic Average --threshold 35 --alarm-actions arn:aws:autoscaling:us-east-1:policystuffhere:autoScalingGroupName/SBMAutoScaleGroup:policyName/SBMScaleDownPolicy --dimensions "AutoScalingGroupName=SBMAutoScaleGroup" When average CPU usage over 10 minutes is under 35, in CloudFront the alarm shows up as "In Alarm State" but doesn't decrease the number of instances. Also, if there's only one instance running it'll spin up another to 2 even if a scale up alarm isn't hit. It seems like the default value is just set to 2 somehow. How can I change this?

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• Should I have a heroku worker dyno for poll a AWS SQS?

  - by Luccas

  Im confusing about where should I have a script polling an Aws Sqs inside a Rails application. If I use a thread inside the web app probably it will use cpu cycles to listen this queue forever and then affecting performance. And if I reserve a single heroku worker dyno it costs $34.50 per month. It makes sense to pay this price for it for a single queue poll? Or it's not the case to use a worker for it? The script code: queue = AWS::SQS::Queue.new(SQSADDR['my_queue']) queue.poll(:idle_timeout => 20) do |msg| # code here end I need help!! Thanks

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