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• PXELinux and compressed kernels/images

  - by Yvan JANSSENS

  Is it possible to boot compressed kernels with a compressed initrd with PXELinux? First, a little background: We created a custom Linux distro, for diskless OpenCL computing nodes. We want those nodes to fetch their OS from the network. Our Distro is composed out of a kernel (duh) and a large initrd which is loaded into RAM and everything is executed from there. We chose to run everything off the initrd for two reasons: NFS was not an option to serve the filesystem's extra contents Fast file access from RAM. No persistent storage needed, data and config is pulled dynamically through a SOAP service. Now our initrd is about 450M in size. At our network speeds, it takes about two to three minutes to load a single client. Will compression speed up te downloading, and if yes, which one should be used? Is LZMA supported by PXELinux, or do we need to stick to bzip2 or gzip? Because of the 2-3 minutes loading time, booting 15 nodes over the same network link takes quite a lot of time. We decided not to use hard drives or CD/DVD drives, for financial reasons (cheapest HDD @ €30 times 15 is a lot of money saved ;-) ) So, our question is: what compression options are available for this setup? And how do we do this? Thank you for your time! Yvan Janssens

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• 2 Computers, same network, different outgoing speeds when uploading to internet?

  - by user117339

  I have 2 work machines in my office, a PowerMac G5 and a MacBook Air. Both behind an IPCop firewall. The PowerMac is connected through a gigabit switch, the MacBook Air is connected through a Netgear 802.11g access point that is then plugged into the gigabit switch. There is also a FreeNAS box, both machines are able to read and write files to it at close to their pipe speeds. The main problem is when I am trying to upload files to the internet at large. The G5 is only hitting 0.1 - 0.25 Mbps. The Macbook is able to hit 2-3 Mbps. The setup (G5 / IPCop / Network) has been the same for 5 years. The issues with the internet speed started about 3 months ago. I hadn't tested on the Macbook at this point. I had complained to the ISP, they said their modem needed a firmware update, did that nothing changed. Reset IPCop, turned off squid, etc. No changes. The ISP switched the office over to a better plan with a theoretical 6 Mbps up, still no change. At this point I tried testing the Macbook, and lo and behold there's the speed. But why? I have tried changing out everything, cables, switches, using another ethernet port on the G5, wiping the system, using DHCP, using manual IPs, changing DNS servers, etc. Nothing works. I figured that if there was something horribly wrong with the network, then internally I would find a similar issue, but that is perfect. iperf, ping, etc show no dropped packets and near saturation of the internal network. I'm at a loss as to what the heck is going on. Any ideas would be appreciated! Below are some screenshots of speedtest.net: G5: Macbook Air:

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• Giving the root user priority to maintain Debian (while server collapsing under heavy load)

  - by Saix

  Is there any way to setup Debian to prioritize any or specific root's activity before every other? For instance, several times per year something gets wrong (usually man's fault by overstressing apache/mysql) and system gets unresponsive under heavy load like 200 (8-core cpu). I know there are limits for php scripts to run then kill, but that's not the way because this limit has to be at least 45 minutes long. The problem is, until I'm able to login via SSH and let apache/mysql restart under this server stress, it nearly hits these 45 minutes anyway. Also hardware restart causing usually to run fsck at boot time on all harddrives since it's usually pretty long the box haven't been restarted. I was told it's really not good idea disabling fsck but then again, it takes more then hour to complete. What is the fastest way to restart apache/mysql? Is there any way to give ssh users or root user higher priority so the logging in and completing these restarts (rather stops though) commands wouldn't take so long? One comes to my mind.. use NICE for apache/mysql but no way. I can't risk limiting those two vital apps 24/7 or could I? I'm a little bit scared if any other system process wouldn't slow the pages down too much. Any backup process, swap (if any) etc. There is pretty heavy PHP framework with 20k visits a day, so it needs every hw/sw resource available. I can't throttle it the whole time, just in certain points when system gets unresponsive, so I could maintain it.

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• Is there a 'global media cache' in Windows 7 that may be used by third party media players?

  - by Pulse

  Here's the background. I don't use Windows Media Player or Media Centre, in fact both components have been 'turned off' via the 'Programs and Features' option. My media player of choice is a nightly build of MPC-HC, which plays virtually everything. I do, however, have VLC portable available for those rare instances when MPC-HC can't or won't play something correctly. This is the situation. I tend to download various media files via torrent, typically, game trailers or freely availably films, such as the recently released, torrent only, Pioneer One. Quite often these files are quite large, being 1GB+ so I quite often like to preview the file after it has downloaded a significant portion of the file. For the most part, this works quite well, and gives me an idea about the worth of continuing the download. Sometimes, however, the file doesn't play as expected and instead plays a completely unrelated file that has been previously played. Here's the strange thing. if I try to preview the file in MPC-HC or VLC both players play the same, previously played file, regardless of whichever player was originally responsible for playback. Most times, it's not even a file that's been played recently. I have searched the registry for some sort of MRU cache, but have found nothing. I have made sure each player has had it's respective history/cache deleted and can fine nothing on disk that seems to be storing this, apparently shared data. So, the question is, where are these unrelated players getting the file information from? Thnaks.

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• Good Hosting Providers With Zend Framework Support [closed]

  - by manyxcxi

  I currently use ixwebhosting for my hosting services. They're cheap and work (most of the time). The databases are horribly slow, the servers are horribly slow, and their support (though usually prompt) is tough to deal with. That being said, they're cheap, I've got like 20 domains hosted in my account, none of them are high volume, and they work JUST good enough- until today. This isn't meant to be a condemnation of ixwh though. Their prices are very low for what they do offer and most things work just fine, most of the time. I need to be able to host web apps written with Zend Framework in a fairly easy fashion. The server performance can't be worse than what I've already had (a pretty low hurdle to clear), and I don't want to spend $30/mo. These are not money making websites- they're projects. My requirements are PHP 5.3, ZF support, MySQL databases, multiple domains- not much. Who should I look at, and who should I look out for?

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• Are there any benchmarks showing difference between hardware virtualisation enabled/disabled?

  - by Wil

  I have a 13" sub-laptop/large-netbook, it has an AMD Athlon Neo X2 L335, and I chose this one because it supports hardware virtualisation. In the end, I hardly do any virtualisation on it, however, when I do... it is fast. To my shock, I went in to the BIOS and saw that virtualisation was disabled! I turned this on and, I see no speed difference.... or at least none that I can tell. I do not have time to do a full set of benchmarks - and I run quite a bit of software on the host, so it wouldn't be scientific. I have searched quite a few places and I just can not find any benchmarks showing the difference of virtualisation bit enabled/disabled on the same hardware. Does anyone have any benchmarks they have seen that they can share? In addition, I know there was an uproar a while ago as Sony disable the hardware virtualisation on some models and only offer it in their higher models as a premium feature, however, apart from forcing an up-sell, are there any benefits to having it disabled e.g. battery/heat? I just can't find any information and can't work out why it would be disabled by default. Edit--- To add, The only thing I can find is that without it, you can not perform x64 virtualisation as fast. This is the only down side I can find. However, if this is the only difference, then I am still interested in the second part of the question - why offer the option to disable it?

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• Is this DVD drive broken? Brand new, i need help convincing

  - by acidzombie24

  I am asking bc i know dell is going to give me a problem. How do i know if my DVD is broken on my laptop? i burnt 4 DL disc and they ALL failed, i called and dell suggested roxio. I used it and burnt 1 disc without error and the 2nd disc with an error. With both apps there were no 'problems' during the burning process only failed on the verification process. Some of these bad disc dont work on other PCs and one locks up windows when i click a specific file. Does that sound like a broken burner to you guys? when i called dell they told me since it can read disc properly 100% of the time and software doesnt fail in the burning process its not a broken drive _. They forward me to software support who demand a fee (i think $100) to help me fix my software. I am annoyed bc i dont want to be on the phone for them to watch me burn a dvd and since i burned it once correctly i dont want to happen to burn correctly again to have them say they solved my problem (doing nothing) and charge me refusing to refund. -edit- The errors i got were 1) the request could not be performed because of an I/O device error 2) Windows locking up when opening 1 specific file 3) Cannot copy : Data error (crc) NOTE: the file that causes the problems are random every disc

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• Install Debian stable linux ISO from USB to dual boot Windows

  - by tgkprog

  I want debian as dual boot with my windows vista, Free'd up 50GB in my d drive. Plan to use 40 for debian install, 6GB for swap space Have a 16GB USB drive Downloaded http://unetbootin.sourceforge.net/ Downloaded DVD files of stable debian-7.0.0-amd64-DVD-1.iso ( debian-7.0.0-amd64-DVD-2.iso and 3) After I choose HD install, unetbootin says place the ISO in the same place. but I have 3. do i need to merge them? if so any freeware to do that? can i do it with 7zip? when I extract with 7 zip there are classes between the 3 ISO files. Just over write? Options to merge (format etc for 7zip) ? Or I must use I tried to keep the 3 files with the other unetbootin files but get an error msg Files I have on my USB 06/30/2013 11:44 PM 2,835,648 ubnkern 06/05/2013 12:14 AM 3,998,007,296 debian-7.0.0-amd64-DVD-1.iso 06/04/2013 03:30 PM 4,696,872,960 debian-7.0.0-amd64-DVD-2.iso 06/05/2013 01:25 AM 4,698,955,776 debian-7.0.0-amd64-DVD-3.iso 06/30/2013 11:45 PM 6,530,278 ubninit 06/30/2013 11:46 PM 155 syslinux.cfg 06/30/2013 11:46 PM 60,928 menu.c32 also i can only copy above files if i format my USB as NTFS On FAT32 says too large to copy .iso How do I get around that? My internet needs a login so cannot do net install

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• Performance-optimizing Oracle 10g on a server that is also a Tomcat JSP app server?

  - by PKHunter

  I have inherited a simple RedHat 5 - 64bit platform. It has SCSI disks on RAID1, with 16GB of RAM. Double Core CPU. Oracle 10g, Release 2. This would be a decent platform for running the DB only, perhaps, but the same server in an "A-A mode" clustering (very simple) also runs Tomcat and there are several Java servlets running on this. Sadly there is no caching platform etc. We only use an external CDN for some html caching. I am personally more familiar with web environments on the LAMPP platform (apache, php, mysql, postgresql). PROBLEM: Because the server has both Tomcat JSP/Java and Oracle 10g running on the same server, with no caching, I have some issues of the server going down. Often, sadly. QUESTION: What are my options in terms of improving performance of all these different apps? Connection Pooling? Example, in Postgresql world we have PgBouncer, which really helps things. Does Oracle have something similar? Or is there a famous Java-based external pooler that people use in production environments? (I'm not familiar with Java) Any "SQL cache" as in the MySQL and Postgresql world? Any other kind of application cache, as "APC" or "eAccelarator" in the PHP world? The "OSCache" stuff from the Java world (JSP thingie I found on Google: http://onjava.com/pub/a/onjava/2005/01/05/jspcache.html?page=2) ... What else? Sorry if this is a noob question. I have googled and googled, but problem is I don't know what to google for, other than the broad general concepts above. So if not full answers, I would even appreciate basic pointers and I am happy to JFGI myself. Thanks!

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• Many clients on a wireless AP for UDP broadcast packets

  - by distorteddisco

  I asked this question on StackOverflow and was directed over here, so I'd appreciate any advice. I'm deploying a smartphone application as part of a live music performance that depends on receiving UDP broadcast packets from a wireless access point. I'm guessing that between 20 and 50 clients will be connected at any one time. I'm aware that a maximum of 20 clients per access point is advised, but as the UDP broadcast packets are ground through the LAN, how would I be able to link multiple APs together? I'm looking for recommendations on a suitable AP for this. The actual data transmission rates are very low - only a few kB/s - as I'm just sending small messages to the smartphone apps, and there will be no WAN internet connection. I tried it with a few connected peers on an adhoc wireless connection without any problems, but ran into dropped packet issues on an old WRT54G running ddwrt, though it's in pretty rough shape. What's the best way to do this? I suppose I could limit concurrent wireless connections to 20 clients... but more would be nice. EDIT: I should also say that it's purely one-way communication; the smartphone application is only receiving broadcast packets, not sending anything.

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• Internet compression proxy for low speed broadband?

  - by user23150

  I live in a rural location, using high-latency wireless off a local ISP's tower. My speed tests vary day to day, but I can get around 1Mb up/down. The problem is, I work with large files, uploading and downloading (HD videos, development software, etc.). It can be painful to wait sometimes. Plus I do some side contract game development, and it can be very difficult to playtest with other developers (200ms ping is a good day for me). Now, obviously it's not going to be easy to solve the latency problem without different wireless hardware. But speedwise, I am wondering if I can use some kind of compression technology on a proxy. For instance, my work computer has full access to a 26Mb down, 10Mb up connection, that is totally unused at night and the weekends. If I could run some kind of compression technology on our server, and use it as a proxy to route to my home computer, I could stand to gain some major speed. I realize that by bogging down a system with compression, I could potentially lose whatever speed gain I had. But the proxy server is a quad core xeon, and the receiving computer is a pretty decent i7 computer, so that shouldn't be a concern. I found http://toonel.net/ but it seems more geared toward very slow narrowband users, like dial-up. Plus, I would prefer to just be able to point my browser to a proxy server, rather then install software on my client machine. EDIT I thought about my question a little more, and realize I am going to need to install software on my client in order to decompress, and possible compress (for uploading). That's not a huge deal.

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• How to make Microsoft JVM work on Windows 7?

  - by rics

  I am struggling with the following problem. I cannot install MS JVM 3810 properly on Windows 7. When I start Interner Explorer 8 without starting any java 1.1 programs choosing Java custom settings under Internet options causes the crash of the browser. I have some Java 1.1 programs that work well in Internet Explorer 8 on Windows XP after the installation of MS JVM 3810. I know that it is not advised to use this old JVM but it is not a short-term option to port the programs in newer Java since it contains 3rd party components. Complete rewrite is a long-term plan. Strangely jview and appletviewer (jview /a) works from a console so the MS JVM 3810 is not completely busted just IE 8 does not like it. The problem with the appletviewer is that it cannot connect to the server even if both signed and unsigned content in Java custom settings have been set to Enable all. (Since Java custom settings was unreachable due to the crash the modifications - including My computer - were performed through the registry and pre-checked to behave correctly on Windows XP and Internet Explorer 8.) If jview was working then I could at least think of a workaround. Is there a way to configure MS JVM or jview properly on Windows 7? Another options would be: Checking Internet Explorer 9 Beta. Using virtualbox and Windows XP older IE in it. Delaying Windows 7 upgrade. ... Update Finally we have modified all the programs to work parallelly as applet and application as well. This way the programs can still be used from browser on older Windows versions. On Windows 7 the applications are started from the desktop. Installation to all user machine can easily be solved since they already have a large common application drive. The code update is fortunately only a few lines of modification: including a main method in the applet class. Furthermore instead of the starting html page a bat file is used to set the classpath before the startup with jview.

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• Group Policy - Published software not upgrading

  - by VokinLoksar

  I'm testing this with mercurial MSIs, but it's the same for other packages. I've created a new group policy and added an old version of mercurial to User software installation as a Published package. On a Windows 7 client I install the package through Programs and Features. The installation works fine. Now, I would like to publish an updated version of mercurial. I create a new Published package. Under 'Upgrades' I configure it to replace (upgrade also doesn't work) the old version and mark this upgrade as 'Required'. The old package is not removed. The Windows 7 client is then restarted. When I log back in, I see a status message saying something like 'Removing managed software Mercurial ...'. There is no message about installation of the upgrade. If I look in Programs and Features, I can see the new version of mercurial listed. However, the actual mercurial directory under Program Files is missing. It's as though the installation recorded information about the MSI, but didn't actually install anything after removing the old version. As I mentioned, this isn't specific to mercurial. I've tried using other apps and have yet to find one that can be upgraded via a Published package. Using Assigned packages in Computer Configuration works without problems, but I would like this software to be optional rather than required. Ideas?

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• customer wont provide ssh access - ftp only

  - by Max

  Eh, here is my problem: I am working in a webdevelopment agency (thats a problem but not the real problem, read on). Most of the time I choose the live server myself when creating a new website project. But now the customer already has a "server" (10 GB on a cheapo host!) and the "admin" refuses to give me ssh access to it. But I need to access the server via shell because many files will be transported (need to be able to upload and extract a tar) and I need to insert or create mysql dumps via command line. He argues FTP and phpmyadmin should be enough... as far as I know the webspace was just ordered to host the website, so no security critical apps are running there. How can I either convince the admin to give me the ssh login or tell management that we need our own server? Anyone with similiar experiences? This is really annoying as this is a very small project that should be done fast and now one has to fight in order to just get the work done...

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• Despeckle line art

  - by Dour High Arch

  We have a number of line-art charts unfortunately saved as JPEGs. They are now riddled with distracting compression artifacts or "speckles". Is there any way of removing these? I do not have the original files and it will be very difficult to recreate them. I am running Windows 7 and tried Paint.Net; none of the filters help. Posterize washed out all the colors and leaves the speckles. Blur makes text unreadable. Noise Reduction wrecks antialiasing of curved lines, and perversely enhances the speckles, making them look like checkerboards. Yes, I have Googled for software to do this; there are many programs that advertise despeckling but, after my experience with Paint.Net, do not want to experiment with applications that show no before and after images. The only example I have seen that does what I want is from a Photoshop tutorial. I have dozens of files and the tutorial requires considerable manual fine-tuning. I would prefer to automate or batch-process this task. Commercial apps are fine, but I do not want to spend over $600 and learning a complex program for a single task.

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• Mac always boots with incorrect display gamma (for years now including Lion)

  - by Alex Wayne

  I think somewhere, something got installed but I have no idea what or how to fix it :( Basically, my old MacBook Pro running 10.5 Leopard had a problem where on boot it would show everything on the screen in a very sort of crunched color space. Everything below 15% white would just be pure black, everything above 85% white would be pure white and all colors look to be a touch more saturated. It's garish. To fix it, I found that I could boot into almost any fullscreen 3D game. When the game launches, the colors would still be off, but when I then quite the game and return the desktop everything is normal again. I've noticed Blizzard games work most reliably for this (World of Warcraft or Starcraft2). This problem has followed me through the years. When I upgraded to an iMac I migrated everything over to it, and the issue now happens on the iMac too. I then got a new MacBook Pro for work and migrated my iMac over to that, and it has the problem too. I had thought that it was an OS bug, but upgrading to 10.6 Snow Leopard didn't fix it and neither did 10.7 Lion. Furthermore I can't find any reference on any forum or help site where anyone else has this problem. If anyone has any idea what processes or settings or apps I should look at to figure out why this is happening I should would appreciate it! It looks sort of irresponsible when I open my laptop in the office to work and then boot up Starcraft 2 full screen...

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• Why am I getting programs stuck in log_wait_commit under Linux?

  - by staticsan

  There is something subtly wrong with my Linux install that I just can't locate. It is Ubuntu Lucid Lynx (10.04) 64-bit. Hardware is a Dell Optiplex 960: Intel Core 2 Quad CPU, 8Gb of RAM, 2x 300Gb HDDs. /home is ext2 on one disk and everything else is on the other (/ is also ext3). I have VirtualBox running a 64-bit Vista image for Outlook calendaring, but the heavyweight apps are IntelliJ, NetBeans, MySQL and Opera. Opera also loads my mail (IMAP) of which there is over 10,000 messages. The problem is that Opera stalls for a few seconds from time-to-time. Watching the process list shows it's in log_wait_commit which means (as far as I have figured out) the filesystem is holding things up. Sometimes I can make this happen by doing a subversion update, but usually it happens for no reason I can see. It usually happens to Opera, but I've seen NetBeans go under, too. It doesn't make the app crash - it's just completely unresponsive for a few seconds. Googling has not helped. The closest I got was to remove the sync attribute in the file system. This achieved nothing. On the advice of a Linux guru friend, I lowered /proc/sys/vm/dirty_writeback_centisecs to 300, but that didn't do anything, either. And it was all he could think of. What is going on and can I fix it? (And how?)

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• What is the typical maximum number of database connections for Oracle running on Windows server ?

  - by Sake

  We are maintaining a database server that serve a large number of clients. Each client typically running serveral client-applications. The total number of connections to the database server (Oracle 9i) is reaching 800 connections on peak load. The windows 2003 server is starting to run out of memory. We are now planning to move to 64bit Windows in order to gain higher memory capability. As a developer I suggest moving to multi-tier architecture with conneciton pooling, which I believe is a natural solution to this problem. However, in order to support my idea, I want the information on: what exactly is the typical number of connections allowed for Oracle database ? What is the problem when the number connections is too high ? Too much memory comsumption ? or too many sockets opened ? or too many context switching between threads ? To be a little bit specific, how could Oracle Forms application scale to thousand of users without facing this problem ? Shall Oracle RAC applied to this case ? I'm sure the answer to this question should depend on quite a number of factors, like the exact spec of the hardware being used. I'm expecting a rough estimation or some experience from the real world.

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• SQL queries break our game! (Back-end server is at capacity)

  - by TimH

  We have a Facebook game that stores all persistent data in a MySQL database that is running on a large Amazon RDS instance. One of our tables is 2GB in size. If I run any queries on that table that take more than a couple of seconds, any SQL actions performed by our game will fail with the error: HTTP/1.1 503 Service Unavailable: Back-end server is at capacity This obviously brings down our game! I've monitored CPU usage on the RDS instance during these periods, and though it does spike, it doesn't go much over 50%. Previously we were on a smaller instance size and it did hit 100%, so I'd hoped just throwing more CPU capacity at the problem would solve it. I now think it's an issue with the number of open connections. However, I've only been working with SQL for 8 months or so, so I'm no expert on MySQL configuration. Is there perhaps some configuration setting I can change to prevent these queries from overloading the server, or should I just not be running them whilst our game is up? I'm using MySQL Workbench to run the queries. Here's an example.... SELECT * FROM BlueBoxEngineDB.Transfer WHERE Amount = 1000 AND FromUserId = 4 AND Status='Complete'; As you can see, it's not overly complex. There are only 5 columns in the table. Any help would be very much appreciated - Thanks!

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• How to get desired FireFox last tab behavior?

  - by JustJeff

  All tabs should be the same; so if any of the have a 'close' button, they all should, including the last tab. I see no reason that a tab's close button should suddenly vanish simply b/c that tab has become the last one open. If I have N tabs open, and park the mouse over the left-most tab's close button, this vanishing close button trick means now I have to make a large mouse move to get to the app's close button. Unsat. Mouse moves = too many milliseconds wasted. Closing the last tab should NOT take me to my home page, or any other page whatsoever. I want the browser to close with the last tab. I do not expect or want "new tab" behavior when I click a Close button. Now, I've gone into about:config and played with browser.tabs.closeWindoWithLastTab, but this setting oversteps its purpose; while it does make the browser close, for some inexplicable reason, it also suppresses the last tab's close button! I have tried the "last tab close button" add-on, and while this does restore the close button, the add-on oversteps by taking the liberty of turning closeWindowWithLastTab off. Is there some way out of this pickle? Is it too hard to just code things to provide simple, orthogonal actions, so that everybody can config the UI to their liking, and not just to a few pre-fab configurations that the developers think everyone should like? Btw, FF 13.0.1 on ms windows

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• visually documenting web server configuration and infrastructure

  - by Alex Ciarlillo

  I have just finished a large re-organization and update of our institutions web server(s). This server hosts 3 virtual hosts, 3-4 blogs, 2 wikis, some legacy static HTML pages, and many hosted documents (PDF, .jpg, .xls). I have organized the site into a structure of something like: /var/www/sites/vhost1, vhost2, vhost3 .../wordpress/blogX .../mediawiki/wikiX Data is in a seperate directory structure so I can run a cron task over it to make sure it is all writeable and such. I then symlink to these data directories for each application. /var/www/data/vhost1, vhost2, vhost3 .../wordpress/blogX/uploads .../mediawiki/wikiX/images All Apache configs are in /etc/httpd/conf.d/vhosts.d/vhost1,2,3.conf On top of this there is also a testing server which mirrors this setup. Once changes are fully tested, they are rsynced down to the live server. All the wordpress installs and mediawiki installs are straight form SVN and updates are done by switching branches or "svn up". So my question is how can I best document to share with a) co-workers, b) possible future replacement, c) myself 6 months from now. Obviously I can make a wiki page, excel document, whatever and fill it with text, but I am looking for a more visual representation that I can use to explain the architecture to less-technical people. Ideally it would be awesome if this visual representation could then be expanded to get more technical details.

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• Win 7 64 with 8 gig of ram, getting running low on memory errors.

  - by John

  I have a new Dell laptop running Win7 64 with 8 meg of ram. If I leave the system running overnight I start getting low memory errors the next day. Looking at task manager it shows 6.27 gig used but looking at the processes list the totals don't show nearly that much. I am showing all processes from all users. I have also looked at the processes with PRocess Explorer and see the same results. Using resource monitor I see 4165 MB in Use, 2328 MB Modified and 1352MB Standby with only about 345 MB free. These numbers don't seem to add up to what I have running. I have Visual Studio 2010 running along with a number of IE8 sessions. I have run the same set of apps with XP SP2 32 bit with 4 gig of memory and never had this sort of problem. What is Modified memory? What is Standby memory? Any suggestions on what might be the issue and what might be a fix? TIA J

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• Calculating memory footprints using /proc/sysvipc/shm

  - by MarkTeehan

  This is for a SLES 10 database server. One of my servers runs three databases and three app servers; I am analyzing how their shared memory segments grow and shrink to avoid intermittent out-of-memory scenarios. "Top" is hot helpful for this since its calculations for RES and VIRT are inconsistent. I am doing this by matching up the contents of /proc/sysvipc/shm with memory usage reported by the database admin console. I do this by totaling up saving the contents of /proc/sysvipc/shm and then total up "bytes" for all of the segments for the offending userid. This is a large server with hundreds of segments and tens (or hundreds) of GB of allocated memory per userid. However it doesn't match up - the database management software claims to be using around 25% more memory than the total I calculate. Negligible swap space is in use, so I am ignoring that. I am running it as root so I am sure I see all shared memory segments. My question is : is all (significant) allocated memory recorded in /proc/sysvipc/shm, or is this only shared memory (*and not "un-shared" memory?). If this is incorrect, what is the correct way to calculate out the total allocated memory for each userid? Also: I believe doing a 'cat' on this file locks server IPC. I check it every 5 seconds - is it likely that this frequency could be problematic? Thanks! Mark Teehan Singapore

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• nginx reverse proxy slows down my throughput by half

  - by Isaac A Mosquera

  I'm currently using nginx to proxy back to gunicorn with 8 workers. I'm using an amazon extra large instance with 4 virtual cores. When I connect to gunicorn directly I get about 10K requests/sec. When I serve a static file from nginx I get about 25 requests/sec. But when I place gunicorn behind nginx on the same physical server I get about 5K requests/sec. I understand there will be some latency from nginx, but I think there might be a problem since it's a 50% drops. Anybody heard of something similar? any help would be great! Here is the relevant nginx conf: worker_processes 4; worker_rlimit_nofile 30000; events { worker_connections 5120; } http { sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 65; types_hash_max_size 2048; } sites-enabled/default: upstream backend { server 127.0.0.1:8000; } server { server_name api.domain.com ; location / { proxy_pass http://backend; proxy_buffering off; } }

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• Why still use JPG compression? [closed]

  - by Torben Gundtofte-Bruun

  Back when the JPG image format was introduced, it made a lot of sense to reduce the file size, even accepting a loss in image quality, because files were being downloaded over a slow and expensive modem connection. In today's world, file size is no longer a concern, at least not regarding JPG where it seems silly to save 45kB on a photo. But my image editing apps still prompt me for the desired compression level when I save a file. Does it still make sense to go with the default 85? Why should I not crank it up to 100 for all files? Update based on comments: For web work, I might use PNG instead. But every smartphone and camera produces JPG files. The question arises when I save these edits. Audience is my own harddisk. We're talking photos, 2-5MB apiece. Chroma, subsampling, DCT - sorry, never heard of it. I'm a home user, not Photoshop guru. For the record, I use Paint Shop Pro on Win, and Gimp on Linux.

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