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• Amazon EC2- many micro-instances vs single small/medium instance

  - by shashankaholic

  I have a chat application using stack of Openfire, Tomcat6 and MySQL. Currently, i have installed all these servers on single Linux micro-instance(613 MB memory). Even in low user base 10-20 i am encountering CPU overload which is quite obvious here. As, i am new to Amazon EC2 can somebody suggest me how to scale up my architecture according to traffic use? should i use separate micro instances for every app server(openfire,mysql,tomcat6) should i use single small or medium instance for whole server stack. Some factors in context: high reliance on MYSQL high memory usage due to file transfer web-application interacting with other Amazon service like S3,SES

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• Can't pipe echo to netcat?

  - by user1641300

  I have the following command: echo 'HTTP/1.1 200 OK\r\n' | nc -l -p 8000 -c and when I curl localhost:8000 I am not seeing HTTP/1.1 200 .. being printed. I am on mac os x with netcat 0.7.1 Any ideas? #!/bin/bash trap 'my_exit; exit' SIGINT SIGQUIT my_exit() { echo "you hit Ctrl-C/Ctrl-\, now exiting.." # cleanup commands here if any } if test $# -eq 0 ; then echo "Usage: $0 PORT" echo "" exit 1 fi while true do echo "HTTP/1.1 200 OK\r\n" | nc -l -p ${1} -c done and testing with: curl localhost:8000

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• Home movie video browser

  - by Jim Hunziker

  I have a bunch of home movies that don't have useful filenames because they came straight off the camera. (I'm using Vista 64, by the way.) Picasa is pretty good for browsing through them and watching them, but it doesn't use my video card for rendering the videos. My CPU gets pegged at max usage, and full screen barely works. Windows Media Player or Quicktime works fine. Is there another application (like Picasa) that can be used for browsing through movies that both uses my video card and shows thumbnails of all the movies in my collection? I'd rather have something nicer than Windows Explorer. (The movies are h.264 AAC 1280x720.)

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• How do I associate server traffic to a domain hosted on that server?

  - by morley

  I have three or four Linux servers, each of which hosts anywhere from 5 to 50 domains. Each domain has its own folder: /www/projectname/web/ Logs go in: /www/projectname/log However, if there's a traffic spike (or, as I see it on my end, a memory usage spike), I'm not sure how to figure out which domain is responsible for the traffic without running tail -f on each of the projects and making an educated guess based on how fast things scroll. There's got to be a better way! There probably is, but I haven't seen it. And the last time I checked, bandwidth monitors only report system-wide load. So if anyone knows how to do this the right way, please let me know. Thanks!

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• How to select the account on the login screen of Windows7 by start typing the name?

  - by akira

  When MacOS boots up and the users is prompted to select the account (s)he wants to login into, the users can either click the name / icon of the account with the mouse or just type in the name of the account. I want to do the same at the login screen of Windows7: Login screen pops up, I start to type my account name, I select the account with enter and then I type the password and enter again. No usage of the mouse involved. (I am aware of tab-cycling and hard-to-follow-the-almost-invisible-marker-of-where-the-focus-is-right-now)

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• Why do some software not get load balanced even when there are multiple cores?

  - by Nav

  While VTune Analyzer was running on a blade server with 8 cores, I observed the cpu useage percentage using mpstat -P ALL 1. mpstat showed me that VTune was taking up 100% of a single core, while all other cores were idle. Why does that happen? Shouldn't the OS (RHEL Server 5.2) automatically distribute load across cores? The same happened when I tried running MATLAB (even after enabling multithreading support in the MATLAB settings). p.s: I'm a developer. Not a sys admin. So felt it better to ask here rather than at serverfault.

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• Is mumble safe (privacy wise)?

  - by AnonymousLurker

  When chatting on IRC, it is possible to leak data like OS, CPU type if the IRC client happens to leak it in VERSION string. Anybody doing /CTCP VERSION can see it. Same about timezone (/CTCP TIME). This can be mitigated by turning replies to CTCP queries off. Also, IP address is leaked to others (/whois nickname will show it if it's not cloaked). By analogy, does the mumble client expose such sensitive data to others that are connected to the same server? If it does, what are the ways to mitigate this?

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• How much space do NTFS hardlinks/symlinks occupy?

  - by Felix Dombek

  Well, I guess it must be something proportional to the original filename plus the new filename for symlinks, and only the new filename for hardlinks, but how does this affect the disk space exactly? I just made a folder with about a hundred thousand symbolic links in it, and the folder still reported 0 bytes usage. I may be mistaken, but I even think the free capacity of the drive remained the same. Then I permanently deleted the folder and the sizes still stayed the same. Could I fill up a hard disk just with symlinks? Or does NTFS have limitations in that no more than x symlinks are allowed on one drive/in one folder, so the capacity of the drive cannot be reached?

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• Linux Software Raid runs checkarray on the First Sunday of the Month? Why?

  - by mgjk

  It looks like Debian has a default to run checkarray on the first Sunday of the month. This causes massive performance problems and heavy disk usage for 12 hours on my 2TB mirror. Doing this "just in case" is bizzare to me. Discovering data out of sync between the two disks without quorum would be a failure anyway. This massive checking could only tell me that I have an unrecoverable drive failure and corrupt data. Which is nice, but not all that helpful. Is it necessary? Given I have no disk errors and no reason to believe my disks have failed, why is this check necessary? Should I take it out of my cron? /etc/cron.d# tail -1 /etc/cron.d/mdadm 57 0 * * 0 root [ -x /usr/share/mdadm/checkarray ] && [ $(date +\%d) -le 7 ] && /usr/share/mdadm/checkarray --cron --all --quiet Thanks for any insight,

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• What can impact the throughput rate at tcp or Os level?

  - by Jimm

  I am facing a problem, where running the same application on different servers, yields unexpected performance results. For example, running the application on a particular faster server (faster cpu, more memory), with no load, yields slower performance than running on a less powerful server on the same network. I am suspecting that either OS or TCP is causing the slowness on the faster server. I cannot use IPerf , unless i modify it, because the "performance" in my application is defined as Component A sends a message to Component B. Component B sends an ACK to component A and ONLY then Component A would send the next message. So it is different from what IPerf does, which to my knowledge, simply tries to push as many messages as possible. Is there a tool that can look at OS and TCP configuration and suggest the cause of slowness?

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• Is there a free tool/package that can monitor web traffic and display URLS accessed? [closed]

  - by Anthony

  I couldn't find a similar question but then maybe I am searching for the wrong terms. A few years ago I used a router like device, I'm pretty sure it was a SonicWall, that did this on a clients site. Basically all traffic would be routed through this device and it allowed the manager/administrator to inspect web usage of the workers, determine how often certain resources were accessed and block them if necessary (much like content filter). It showed reports based on domain name reached etc. Facebbok.com, Bebo.com and so on. It also displayed the usual IP traffic information etc. it was a UTM also. I have tried Endian firewall, with it's NTOP install, but I don't think that will show URLs browsed. Maybe I just haven't found it in NTOP yet? I need this to troubleshoot connection and traffic issue at my home, with about twenty devices/users so didn't want to buy a dedicated solution and have spare hardware to use a community product.

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• How to configure an ASUS motherboard.

  - by Absolute0

  I have an ASUS P7P55-M motherboard running with an Intel Core i5-750 processor and 4 GB RAM with 1600 MT/s speed. For some reason the default settings of the motherboard make all the components run at half their optimums. I have switched to the "D.O.C.P." profile and supposedly everything is as it's supposed to be (verified with CPU-Z). There is also an "X.M.P." profile and a manual one. Are either of the DOCP or XMP safe to go with? I wouldn't use the manual mode as I would likely mess something up real bad. XMP seems to be more memory oriented.

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• Deployment from OVA format

  - by Manvendra Bele

  I am deploying a VM using a OVA format. The size of OVA format is 57 GB. Currently free space on my datastore is 388 GB. At the time of selecting Disk Format type if shows me in red that the disk size required is 1 TB therefore you cannot select THICK provisioning. Therefore, i selected THIN provisiong. It THIN provisioing i am showed that Estimated Disk Usage is 112 GB which is less than the free space available. But even after selecting THIN proviosing at the time of deployment it throws an error that it cannot create disk as the size of disk is larger than the maximum specified limit. My block size is of 1 MB. Pasting my exact error here: Failed to deploy OVF package:File [datastore1] IMS Tester 1/IMS Tester1_2.vmdk is larger than maximum size supported by datastore 'datastore1

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• How can I optimize ubuntu desktop to run my webserver

  - by Parry

  Hi, I am using ubuntu desktop edition to run My drupal website on Intranet. I know for running web servers best thing to install is ubuntu server editions, but due to some problem i am using Desktop edition. I installed XAMPP on my machine an my website is up and running. I want to know how can i optimize my machine?? Since I will not use very less features of desktop editions are there any things which I can remove or stop which will free memory and cpu consumption, are there any packages which i should install to increase the performance of my ubuntu??

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• How to track my kid's Multi-Browser website history

  - by Rachel

  My kid is 14, homeschooled and capable computer user. All of her school work is done online; the computer literacy course even uses 3 different browsers, Chrome, IE, and Firefox. I have 2 laptops, running Win7 (one is Pro, the other Home). Is there a way to get all of her browser history in one place? I have to account for 60 minutes of class time per subject per day, but trying to do this across all 3 is getting too complicated. Thanks! PS. My kid and I talk about internet safety and usage regularly and she knows that I monitor where she goes and how long she is there. Secrecy is not an issue.

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• JFFS2 poor mount performance

  - by Marcin Polkowski

  I run multiple ARM boards with Debian Linux installed. Board is equipped with 512 MB of NAND memory. I've observed that after ~3 months of continuous run booting time increased significantly - it takes over 3 minutes to mount filesystem (JFFS2). System was using about 35% of available storage so I’ve removed unnecessary files (got to ~18%) but this didn't change anything. Then I realized that my software produces directories that are left empty so I’ve removed ~500 empty and unnecessary dirs. This didn’t help either. After system is started I see JFFS2 garbage collector (jffs2_gcd_mtd4) running and occupying over 90% of CPU. Now my question: is there a way to „optimize” JFFS2 filesystem for better performance - faster booting (my system have limited timid to boot up)? It would be great if this optimization could be done remotely - I have no physical access to boards.

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• How do I tell if my Windows server is swapping?

  - by churnd

  I'm using Process Explorer to monitor my windows server while it reconstructs some data. It's primarily a CPU intensive process, but I want to make sure it's not swapping. How can I tell if it is using Process Explorer? My initial guess is in the System Information window, it's Paging File Write Delta. Yes? No? I'm an idiot? *Screenshot is not of the server... just an example.

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• Using VLC to Unicast High Definition Webcam over local gigabit LAN with low/zero delay

  - by Robin Day

  We're setting up a webcam "window" between two offices in the same buildilng. The two PC's are connected to the same gigabit switch. We're using VLC to stream the webcam over HTTP using the following commands. vlc dshow:// :dshow-caching="0" :dshow-size="640x480" :sout=#transcode{vcodec=h264,vb=0,scale=0}:http{mux=ffmpeg{mux=flv},dst=:8080/} :no-sout-rtp-sap :no-sout-standard-sap :ttl=1 :sout-keep vlc http://192.168.0.1:8080 :http-caching="0" Even with the caching set to zero, the delay in the image is a good 2-3 seconds. The CPU usage of each pc is also maxed. I'm guessing it's the transcoding that's causing much of the delay. Can anyone give me some changes to these command lines that will reduce the transcoding power, or send the webcam over a different protocol, or anything that will reduce the delay of the cameras? Bandwidth is not an issue at all as the pc's can be connected to a dedicated switch/vlan if required.

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• Server monitoring for medium scale UNIX network

  - by nbartolomeo

  I'm looking for suggestions for a good monitoring tools, or tools, to handle a mixed Linux (RedHat 4-5) and HPUX environment. Currently we are using Hobbit which is working reasonably well but it is becoming harder to keep track of what alerts are sent out for what servers. Features I'd like to see: Easy configuration of servers. The ability to monitor CPU, network, memory, and specific processes I've looked into Nagios but from what I have seen it won't be easy to set up the configuration for all of our servers ~200 and that without installing a plugin into each agent I won't be able to monitor processes.

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• How do I tell if a Python pip install is working correctly or hanging?

  - by wobbily_col

  I am trying to install the python pandas package in a virtualenv using pip. On my development machine it installed correctly, but now I am trying on the server, it gets so far then it seems to get stuck: warnings.warn(LapackSrcNotFoundError.__doc__) /apps/PYTHON/2.7.3/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'define_macros' warnings.warn(msg) non-existing path in 'numpy/distutils': 'site.cfg' non-existing path in 'numpy/lib': 'benchmarks' Could not locate executable gfortran Could not locate executable f95 Found executable /apps/modules/wrappers/fortran/ifort Top shows ifort running at 46% cpu. Is there any way I can tell if this is working correctly (can I check files it is updating for example), or if it is stuck in a loop? It has been running for 40 minutes so far.

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• Enable a program in Windows to run multiple times?

  - by user135490

  I've got this legacy software that only allows you to run one copy at a time, it detects that you have another session opened and it won't allow you to open a second instance. The problem is this is a cpu intensive program and it only use a single core. Is there any hacks or tweaks so I can trick it and open more than one instance? This would allow me to retire about 5 servers... I'm using Windows 2008 R2. I had to use cff explorer to enable the use more than 2GB RAM as the program crashes when it tries to use more than 2GB.

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• Minimalistic flatfile-based "wall" PHP app with authentication and RSS?

  - by Nicolas Raoul

  I am looking for an open-source minimalistic "message board" PHP software. Not a forum, more something like one simple facebook wall. The only thing a user can do is post a new message. With RSS, and able to run on flat files (no database) with Apache+PHP Authentication based on a configuration file, no management UI needed. For now I use this software, but it lacks RSS: http://nrw.free.fr/data/projects/pano/demo/index.php?pano=ifc Anyone knows a software that matches my description? Thanks! Usage: communication between my family's 5 members living on different continents.

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• Why does Windows 7 x64 work faster than an x86 edition on my PC?

  - by Jasper

  Why does Windows 7 x64 work faster than an x86 edition on my PC even though I mostly use x86 things in it? What's wrong with me, and what am I missing? Majority of the things I use is x86 (e.g. DAWs, games, media players). A considerable amount of them, however, are x64 (although their x86 counterparts work just fine). I've tried using the same things on the same system but always ended up finding Windows 7 x64 working slightly faster than x86. I'm very observant. I even notice the tiniest window animations. System: Windows 7 Ultimate x64 CPU: Intel Core 2 Duo E7500 @ 2.93 GHz RAM: 2 GB x 2 = 4 GB DDR2 @ 332 MHz Motherboard: Intel D945GCNL Graphics: ATI Radeon HD 4350 @ 1 GB Dedicated Audio: M-Audio FastTrack Pro HDD: Samsung HD753LJ 733 GB & Samsung HD160JJ 156 GB As you can see, my system is old.

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• Corrupt mysql system tables

  - by psynnott

  I am having issues with the columns_priv table in the mysql system database. I cannot add new users currently. I have tried repairing it using mysqlcheck --auto-repair --all-databases --password but I get the following output: mysql.columns_priv Error : Incorrect file format 'columns_priv' error : Corrupt Is there any other way to repair this table, or how do I go about replacing it with a blank table? What would I lose by doing that? Thank you Edit (Additional Info) mysqld is currently using 100% cpu constantly. Looking at show processlist, I get: mysql> show processlist; +-----+------------------+-----------+-------+---------+------+-------------------+------------------------------------------------------------------------------------------------------+ | Id | User | Host | db | Command | Time | State | Info | +-----+------------------+-----------+-------+---------+------+-------------------+------------------------------------------------------------------------------------------------------+ | 5 | debian-sys-maint | localhost | mysql | Query | 1589 | Opening tables | ALTER TABLE tables_priv MODIFY Column_priv set('Select','Insert','Update','References') COLL | | | 752 | root | localhost | NULL | Query | 0 | NULL | show processlist | +-----+------------------+-----------+-------+---------+------+-------------------+------------------------------------------------------------------------------------------------------+ 2 rows in set (0.00 sec)

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• Home movie video browser

  - by Jim Hunziker

  I have a bunch of home movies that don't have useful filenames because they came straight off the camera. (I'm using Vista 64, by the way.) Picasa is pretty good for browsing through them and watching them, but it doesn't use my video card for rendering the videos. My CPU gets pegged at max usage, and full screen barely works. Windows Media Player or Quicktime works fine. Is there another application (like Picasa) that can be used for browsing through movies that both uses my video card and shows thumbnails of all the movies in my collection? I'd rather have something nicer than Windows Explorer. (The movies are h.264 AAC 1280x720.)

  Read the article

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