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• java memory allocation under linux

  - by pstanton

  I'm running 4 java processes with the following command: java -Xmx256m -jar ... and the system has 8Gb memory under fedora 12. however it is apparently going into swap. how can that be if 4 x 256m = 1Gb ? EDIT: also, how can all 8Gb of memory be used with so little memory allocated to basically the only thing running? is it java not garbage collecting because the OS tells it it doesn't need to or what? TOP: top - 20:13:57 up 3:55, 6 users, load average: 1.99, 2.54, 2.67 Tasks: 251 total, 6 running, 245 sleeping, 0 stopped, 0 zombie Cpu(s): 50.1%us, 2.9%sy, 0.0%ni, 45.1%id, 1.1%wa, 0.0%hi, 0.8%si, 0.0%st Mem: 8252304k total, 8195552k used, 56752k free, 34356k buffers Swap: 10354680k total, 74044k used, 10280636k free, 6624148k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1948 xxxxxxxx 20 0 1624m 240m 4020 S 96.8 3.0 164:33.75 java 1927 xxxxxxxx 20 0 139m 31m 27m R 91.8 0.4 38:34.55 postgres 1929 xxxxxxxx 20 0 1624m 200m 3984 S 86.2 2.5 183:24.88 java 1969 xxxxxxxx 20 0 1624m 292m 3984 S 65.6 3.6 154:06.76 java 1987 xxxxxxxx 20 0 137m 29m 27m R 28.5 0.4 75:49.82 postgres 1581 root 20 0 159m 18m 4712 S 22.5 0.2 52:42.54 Xorg 2411 xxxxxxxx 20 0 309m 9748 4544 S 20.9 0.1 45:05.08 gnome-system-mo 1947 xxxxxxxx 20 0 137m 28m 27m S 13.3 0.4 44:46.04 postgres 1772 xxxxxxxx 20 0 135m 25m 25m S 4.0 0.3 1:09.14 postgres 1966 xxxxxxxx 20 0 137m 29m 27m S 3.0 0.4 64:27.09 postgres 1773 xxxxxxxx 20 0 135m 732 624 S 1.0 0.0 0:24.86 postgres 2464 xxxxxxxx 20 0 15028 1156 744 R 0.7 0.0 0:49.14 top 344 root 15 -5 0 0 0 S 0.3 0.0 0:02.26 kdmflush 1 root 20 0 4124 620 524 S 0.0 0.0 0:00.88 init 2 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kthreadd 3 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/0 4 root 15 -5 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/0

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• Upgrade or replace?

  - by Felix

  My current PC is about four years old, although I have made upgrades to it throughout its existence. The current specs are: (old) Intel Pentium D 2.80Ghz (32K L1 / 2M L2), Gigabyte 945GCMX-S2 motherboard (old) 2.5GB DDR2 (slot0: 512MB @ 533Mhz; slot1: 2GB @ 667Mhz) (new) HIS Radeon HD 4670 - I think this is limited by the motherboard not supporting PCIe 2.0 (?) (old) WD Caviar 160GB - pretty slow (new) WD Caviar Black 640GB (if any more specs are relevant, let me know and I'll add them) Now, on to my question. I've been having performance issues lately, both in video games and in intensive applications. A couple of examples: Android application development (running Eclipse and the Android emulator) is painfully slow (on Linux). I only realized this when, at my new job as an Android dev, both tools are MUCH quicker. (I'm not sure what CPU I have there) The guys at my new job got me NFS Hot Pursuit, in which I barely get like 5-10FPS, even with graphics options turned all the way down My guess is that the bottleneck in my system is my CPU, so I'm thinking of upgrading to a Quad Core i5 + new motherboard + 4GB DDR3 (or more, 'cause I know you'll all jump and say 8GB minimum). Now: Is that a good idea? Is my CPU really a bottleneck, or is the whole system too old and I should replace it? I run Windows 7 on the old, 160GB HDD (which is on IDE, by the way). Could this slow down games as well? Should I get a new drive for Windows if I want to play new games? I know nothing about power supplies. Could that be a problem / will it be a problem if I upgrade to an i5? How come DiRT2 works on full graphics settings (pretty amazing graphics by the way) and NFS Hot Pursuit pulls only 5-10FPS?

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• Is there such a thing as a file hosted container which deduplicates data held within?

  - by Mallow

  Background I have backups of a website which stores all of it's data into a single file. This file is several gigs large and I have many different backups of this file. Most of the data within is mostly the same plus whatever was added or changed to it. I want to keep all the concurrent backups I've made through the years in case I find a horrible surprise of data corruption along the line. However storing a 10gig file every month gets expensive. Seeking Solution I've often thought about different ways of alleviating this problem. One thought that comes up very often combines the idea of a duplicating file system which doesn't require it's own partitioned volume on a hard drive. Something like what truecrypt does, what it calls, "file hosted containers" which when using the truecrypt program allows you to mount and dismount that volume as a regular hard drive. Question Is there a virtual hard drive mounter which uses file-based container which uses data deduplicaiton file system? (This question is a little awkward to put into words, if you have a better idea on how to ask this question please feel free to help out.)

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• "Windows failed to start" loop with 0xc0000225. No install discs, EasyRE/USB iso hasn't worked

  - by mvidaure

  I've been suffering from this "Windows failed to start" loop with 0xc0000225 for 3 days now and I still can't fix it. The major problem is that I don't have any sort of installation disc. However, I have tried EasyRE via both CD and USB but both result in the same problem.  I try to perform an 'Automated Repair' on my computer and I get in red text "The selected partition is corrupted and could not be accessed or repaired. Please select a different drive to continue." It is also labeled as NO under Active. Since I do not have a the installation discs, I made a USB with a Windows_7_Recovery_Disc  iso (as shown here http://www.sevenforums.com/tutorials/31541-windows-7-usb-dvd-download-tool.html) but it also doesn't work. I get a blue screen that says "RECOVERY You pc needs to be repaired. The application or operating system could not be uploaded because a required file is missing or contains errors... File:\WINDOWS\system32\winload.efi Error code: 0xc0000225 You'll need to use the recovery tools on your installation media. If you don't have any installation media, contact your system administrator or PC manufacturer." Thanks in advance! Miguel

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• LSI1068E hidden drives after failed raid volume creation

  - by silk

  We are using LSI 1068E raid chipset with SAS drives. We had added new drives to the system, and tried to create new raid volume with the lsiutil, unfortunately the creation failed. The problem is that now we do not have the new raid volume and disks 'disappeared' and are not available as targets for raid. Lsiutil option 8 (scan for devices) does not display these disks at all. lsiutil option 16 (display attached devices) does list them as targets. lsiutil option 21+30 (create raid) does not list these disks. Just after insrting them to enclosure these disks appeared in the system, as expected. During the raid creation kernel logged: Mar 4 08:40:02 kilo kernel: [57555.687946] mptbase: ioc0: RAID STATUS CHANGE for PhysDisk 2 id=0 Mar 4 08:40:02 kilo kernel: [57555.687978] mptbase: ioc0: PhysDisk has been created Mar 4 08:40:02 kilo kernel: [57555.695438] scsi target0:0:2: mptsas: ioc0: RAID Hidding: fw_channel=0, fw_id=0, physdsk 2, sas_addr 0x5000c50008ebe5fd for both of them, again as expected. Unfortunately they did not appear back even though the volume was not created. The same situation is in the controller's bios after a reboot. Taking the disks out and inserting in different slots did not help, either. Has someone seen a similar problem? And knows how to 'get back' our disks?

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• Clean installation of RHEL 5.5 claims package "desktops" is missing

  - by TKguru42

  Hi all, I'm a student worker in the CS department of my university, so please forgive me for any unprofessional descriptions. Simplified explanations are appreciated. I recently replaced some bad graphics cards in a few public workstations. The machines are all the same model. Before putting them back on the network I did fresh installs of RHEL---first I tried 5.4, but yum update ran into all sorts of ugly dependency errors and if I tried to remove any of the problematic packages, the whole operating system FUBAR'd. Using RHEL 5.5 gave me the same errors during install saying that "java.1.5.1-sun*" and "desktops" were missing, but yum update didn't have any dependency problems. Now that I tried logging in through the GUI, I encounter no GUI past the standard RHEL login page. The desktop is a uniform light teal and there's no system tray. An xclock window and an xterm window are open, and Firefox opens automatically, but that's it. Nothing else. What's REALLY confusing is that the computer claims that gnome is already installed, except it clearly isn't working. Any help or advice is greatly appreciated. If it helps, our department uses kickstart to run our standard Linux installs. I can try to get the script if that would be of use. Thank you!

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• Tried to install Mint to a Flash Drive. Now I can't boot from the main hard disk.

  - by Dan

  Hello, all. I'm kind of new to Linux and I need some help. I wanted to install a Linux distro to a flash drive so that I can have a portable OS with all my settings, programs, etc. wherever I go. So I fired up a Linux Mint Live CD and installed Mint to the flash drive, and this seems to work OK. But now, whenever I try to boot up my system normally without the flash drive plugged in, it doesn't seem to work. It basically hangs for a bit, and then I get the following prompt: error: no such device: (some long hex val) grub rescue> However, when I try powering my system up when the USB is plugged into the computer, it gives me an option between using the OS installed on my USB and the OS installed on my HD. Selecting the latter, everything loads up just fine. I'm guessing that installing Mint to the flash drive somehow messed with my native Grub installation, but, again, I'm kind of new to Linux, so I'm not sure exactly why. Any help is greatly appreciated.

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• Can I set up arbitrary filesystem redirection in Windows?

  - by Jon

  I am sitting in front of a Windows 7 machine that has no drive Q:. Is it possible to arrange for accesses to Q:\somedir to be redirected to an arbitrary location on the existing filesystems (for example, C:\Windows)? I would especially like a "set it and forget it" option, if one exists. I am assuming (although I have not tried it) that it is possible to use SUBST to mount an existing (empty, created for this purpose) folder as drive Q: and then MKLINK /J to create a directory symbolic link from Q:\somedir to wherever I want. However, this approach has a couple of drawbacks that I would like to avoid if possible: The drive Q: will be visible in the system. It is not as clean as I would like (removing the mounted folder will break it; a batch script needs to be manually added to the system startup). Is there a better option? If there is none and I am forced to make compromises, what is the closest I could get to the ideal solution? Assume anything is up for discussion.

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• Debian: Unable to mount a second drive as a subdirectory inside of another partition.

  - by jkndrkn

  Hello. I have the following /etc/fstab: # /etc/fstab: static file system information. # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc defaults 0 0 /dev/md1 / ext3 defaults,errors=remount-ro 0 1 /dev/md0 /boot ext3 defaults 0 2 /dev/md5 /home ext3 defaults 0 2 /dev/md3 /opt ext3 defaults 0 2 /dev/md6 /tmp ext3 defaults 0 2 /dev/md2 /usr ext3 defaults 0 2 /dev/md4 /var ext3 defaults 0 2 /dev/md7 none swap sw 0 0 /dev/sdc /home/httpd ext3 defaults 0 2 /dev/hda /media/cdrom0 udf,iso9660 user,noauto 0 0 /dev/sdc1 /mnt/usb/backup-1 auto defaults 0 0 I am unable to get /dev/sdc/ to mount at /home/httpd/ on reboot. The /home/httpd/ directory exists. Mounting via mount -t ext3 /dev/sdc /home/httpd works just fine. Mounting via mount -a generates the following error message: mount: you must specify the filesystem type This is, incidentally, the same message that I see while booting. The error message goes away if I comment out the line in fstab starting with /dev/sdc.

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• Putting and configuring grub on an external drive

  - by HisDudeness

  I want to put a bunch of minor emergency operating systems (such as GParted Live, DSL, Puppy Linux and so on) on a partitioned USB pen drive, with a dedicated grub boot loader on it, which I want to start when I select the drive in the BIOS to boot. The problem is: when writing grub boot options I must tell where kernel and initial ram files are located, but the USB drive can have different letters depending on when I did plug it in, if some others external drive were mounted. So, how can I write appropriate options which automatically refer to the drive grub is installed on without having to specify absolute paths, which might change (I mean, like (hd1,msdos1) ot /dev/sdb1)? And, while we are at it, can I have grub working on a device without an operating system on it to which it can refer? I mean, I want to address the command sudo grub-install /dev/sdb from the LMDE system I'm on right now, but I won't have LMDE on my pen drive. Is that a problem? And installing grub on another device, will I keep the grub I have right now on my HDD?

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• Out of memory errors but not actually out of memory...

  - by commradepolski

  So, myself and my fellow support techs have been fighting with this issue and we still dont know what the problem is. Lets start off with the system specs: Windows XP 32 bit Corporate (SP2 and SP3) Intel D975XBX2 Mobo 4gb of ram Intel Core 2 Quad Q6600 ATI Radeon HD 3600 - 512mb After a few hours of working on the machine, the end user will begin to see the following symptoms: Out of memory messages Title bars and menus dont draw in properly Problems accessing network resources Problems opening up documents such as MSWord and MSPowerpoint and text files Problems opening up explorer windows General instability We have looked at task manager while this issue was occurring, and all indicators, like PF usage, threads, handles, etc. are normal. We have been having trouble pinpointing the root cause of this issue. It is also not situated with one user, it affects 8-10. So far we have tried: Resetting CMOS (Waiting to see results) Replacing video card (didnt help) Windows updates (didnt help) Updating network drivers (didnt help) Switching user from 1gbps to 100mbps network connection (awaiting results) Swapping the affected user's hardware (waiting for results) Increasing desktop heap size (helped for a bit but then the issue became more frequent) Applying the /3 switch to XP (didnt help) Increasing and decreasing and setting PF to system managed state (didnt help) We did have a power outage at the office a couple weeks ago, and all these issues became more frequent. Prior to the power outage it may take a week or so for the users to experience the issues but since the power outage it takes 3-4 hours or less. We havent had reports of the above issues causing BSODs, although that would be easier to diagnose :). Any help is greatly appreciated.

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• SSD won't boot anymore

  - by LordrAider

  Yesterday I put the computer to sleep. Something went wrong because it didn't go fully to sleep. So I restarted the pc and now it won't boot windows 7 anymore. It said : "Please insert valid boot device". I ran Windows 7 restore disc and tried restoring, first it said, mbr fixed. No result but now it said : "Operating system could not be loaded" I ran Windows 7 restore disc again and then it said something about a corrupt partition and that he fixed it. But got the same msg at restart about operating system not found. I ran Windows 7 restore disc again and used diskpart and watched the volumes. My SSD shows up as RAW filesystem... not as NTFS. The size of the disk seems correct. In the bios it also shows up as Healthy disk. What could went wrong and could I recover data with testdisk? I assume something went wrong with the partition :(. It's a Plextor SSD 256M2P SSD, only 3 months old. Thx in advance

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• Windows Server 2003 (w/Exchange) move to new machine

  - by James Booker

  I have an ageing domain controller (the only one on a 10-pc network) which needs rebooting often. I have a Dell Poweredge 2850 server doing nothing, so I'd like to move the DC to that, but here's the catch - I don't have Win2k Server Std install media any more as it's been lost. I purchased "Easus Todo Backup Advanced Server" which claims to be able to recover to dissimilar metal, but it's not quite working (although I don't think it's the product's fault) I know the server and PERC RAID card are good because I installed Ubuntu on the logical drive (4 x 72GB disks RAID 5) no problems. I've booted frmo the Easus Todo backup CD (which is WinPE based) and recovered to the logical disk on the RAID (after installing driver inside the WinPE environment from a NAS drive) The problem is when I boot the server, I can get the OS selection menu, but any option results in a blank screen, with no errors. I figure this is probably because the driver wasn't installed on the old machine (which is IDE-based (i know, i know!) and doesn;t have a RAID controller) I've booted from the CD and copied the mraid35x.sys file to the c:\windows\system32\drivers folder on the recovered system, but it makes no difference. I made a boot.ini with rdisks 0-10 defined, and booting from each of these resulted in a file error (i.e. 'this isn't a real disk') - the only disk that gets any response (the blank screen) is multi(0)disk(0)rdisk(0)partition(1) which just gives me the blank black screen and no disk activity. Is there any way I can force the drvier to be installed on the source system (so i can do a full backup again), i've tried right-clicking the oemsetup.inf and clicking install, but it didn't actually do anything. I attempted to force it with the 'Add new hardware' wizard and forcing with the 'have disk' option but it still gave me no hardware to select. Also I've got an identical machine running WinXP which uses the PERC driver successfully (which was obviously done at install time) and the boot.ini settings are the same : multi(0)disk(0)rdisk(0)partition(1) Any ideas would be appreciated.

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• Is it possible to recover from the Windows 8 refresh feature?

  - by Warren P

  The intention of the Windows 8 RTM (released version) Refresh feature is to restore the system to the way it was when I first installed. It didn't though. Almost everything that came in the start-screen (not a menu any more) is gone, not just third party apps I installed, but EVERYTHING other than the icon for internet explorer, and the icon for the store, and the desktop, were wiped. Out of the box Windows 8 had a pretty large list of things installed, and it seems that the Refresh feature wipes all of them out. Is it possible to really get the system back to a fresh install state, or should I just re-install from the DVD I made? (I have access to Windows 8 RTM, legally through the MS Action Pack subscription.) I suspect that if I create a new account, I might get a new desktop with a default set of icons, but I'm hoping it might be possible to do this without using a different login. The second problem with Windows 8 refresh is it seems to trash the ACL's on my C: drive, taking all permissions away for access to the C: drive, making nothing on it visible or readable to my primary and only login account. I believe it might be possible to undo the damage done by the "refresh" with some judicious use of icacls from the command prompt.

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• Why is "start in" needed for Windows scheduled tasks?

  - by GomoX

  We develop a web application that can be deployed on Windows or Linux. The Linux implementation uses cron, and the Windows one uses scheduled tasks to run a single PHP script that processes all scheduled tasks for our system. The task is scheduled using schtasks during the install process, like: This has always worked both under W2003 and W2008. A week ago a customer reported that scheduled tasks were not running. He is running on Windows 2008. We checked over and over and finally solved the issue by entering the folder that contains the .vbs script as the "start in" folder for the scheduled task. This said, there is no way to set up the "start in..." value from schtasks without using an XML definition of the tasks. XML definitions don't work in Windows 2003, so I would have to add windows version detection to the installer, additional testing, etc (I'd like to avoid this if at all possible). The only atypical thing I noticed about the install is that the system is installed in D:\ as opposed to the default C:\Program Files (x86)\, but I don't see how this would matter. All the paths are absolute in all the scripts. Can anyone suggest a reasonable solution for this?

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• Linux can dual display but windows can't?

  - by Mr_CryptoPrime

  I have two monitors, one that is hdmi-to-dvi and the other vga-to-dvi. I have an AMD HD Radeon 6900 series graphics card installed. I got Ubuntu to display dual monitors, but then I restarted for an update and then Ubuntu wouldn't even boot in recovery mode, it just kept cycling forever...displaying something about "timeout: killing [filepath] [hexadecimal]. So I tried booting into windows (7-professional) and it crashed and displayed this after rebooting: IRQL_NOT_LESS_OR_EQUAL, PAGE_FAULT-IN-NONPAGED-AREA. I went into Bios and reverted to the system defaults and ran system restore and it booted ok, but the dvi-to-dvi monitor would not display. I made sure my drivers were updated and catalyst was updated. Also through research discovered only one is for vga and the other is digital only, so I put the vga-to-dvi in the vga slot and so on. Neither windows or catalyst will detect the dvi-to-dvi montior. Any suggestions? Thanks. EDIT: Found out that booting into Ubuntu with only one monitor (using either monitor with either cable) worked perfectly fine. I could then add another monitor and it displays ok. However, it will, out of the blue, suddenly distort the display. At first I thought the computer crashed, but it is something with the video output from the GPU to the monitor because I pushed the power button and it would refresh every 5secs or so and I could see the "Ubuntu will power down in X seconds", even though it was horribly distorted. Any ideas what's causing this?

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• what are these weird IP address connections in resource monitor?

  - by bill

  I decided to check out Resource Monitor (on the 'Performance' tab in Task Manager, Windows 7) and I noticed in the "Network" section that the 'System' image name kept making a bunch (~5 at a time) of connections to random IP addresses, it would show anywhere from 1-500 bytes/sec 'sent'. They would stay connected for 1-2 minutes. -All web browsers are closed So, first thing I did was run a trace from network-tools.com on some of these IP addresses. 8/10 were outside of US and did not resolve to any host name. Of the 10 IP addresses I traced, 2 were in US, 4 showed origins in China, and one each to Algeria, Russia, Pakistan, Korea. (!) So, the next thing I did was turn off my wireless card, watch the connections disappear, then turn the card back on, and within 30 seconds more random connections were created by System, with different IP addresses from the first time. The next thing I did was go open Task Manager, Show Processes From All Users, then I killed just about everything that wasn't (what appeared to be) a windows process. Turned on wi-fi, and again within 30 seconds, random IP addresses connect for ~ 1 min at a time, new ones coming and going. I occasionally use bit torrent on this machine, but there was definitely no process that seemed related to bt running after I went through task manager, and bt wasn't open to begin with. So, any ideas on what these connections might be for? I have been using Ad-Aware Free and AVG Free on this computer for a while now, always up to date..

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• Un-do Windows disk convert HFS+

  - by BLAKE

  Last night, a friend asked my to give him a copy of a word document. He handed me an external hard drive and left. I plugged the hard drive into my file server running Windows Server 2003, opened disk management and clicked OK. (I know that in Windows 2003 you need to manually assign a drive letter to external drives.) I then looked at the drive in disk management and it said that it was unallocated space. I called my friend and he said that there was data on the drive, but he used it with his Mac Book. Aperantly when I clicked OK in disk management I converted the from HFS+ file system to something else. Is there any way to undo the disk convert? I immediately removed the drive, so there was no writing to it. Windows did not format the drive, it just converted it. Is the data still there? All the data recovery programs I have are for windows, can they read the Mac file system? I need to get the data back, what can I do?

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• Print job leaves queue but document isn't printed

  - by midnightstar

  I'm dealing with an HP Deskjet F380 All-in-One printer. It's connected via USB to a desktop running Windows 7 Enterprise x64. If I attempt to print something like a web page or a word document, the print job will show up in the print queue and the printer would stir. By stir, I mean, it would seem to prepare itself to print. However, the print job would then leave queue (I'm thinking the computer sees it as completed) and the printer would never actually print anything. However I went into Printers and Devices under the Windows start menu, into printer properties, and print a test page, the test page would print out successfully. I attempted to uninstall and re-install the printer drivers for the printer, but the printer would continue the same behavior afterwards. I also connected the printer to another computer and the printer will print just about anything. I also checked to make sure that the computer the printer needs to be connected to was update to date as far as the OS. The machine is fully up to date. I played with the way the computer handles printer spooling. Under the printer properties, under the "Advanced" tab, I had the print job print directly to the printer. In all these instances, the same behavior continues. I've restarted the printer spooling service. I've also gone under C:\Windows\System32\spool\PRINTERS and deleted files that were sitting in the folder. I have ran SFC /scannnow and the system found no errors in the system's integrity. I had the computer and printer make a cold reboot individually. The only lead I really have going for me is that since the printer prints on other PCs, I can only assume that there is something wrong with the way the PC is configured.

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• Installed Memory (RAM): 8GB (4GB Useable)

  - by Mike Bannister

  I have 4X 2GB RAM sticks installed, Windows 7 Ultimate x64 shows "Installed Memory (RAM): 8GB (4GB Useable)" in the system information. The motherboard says it supports up to 16GB of memory. I had Windows XP x64 and I'm pretty sure it was able to use all 8Gigs of memory. I've just formatted and am not burning through 4GB for sure. *The BIOS only show 4096MB while booting. I was only able to find one option relating to memory mapping and it took it from 4Gigs to 3 and change. CPU-Z shows all 4 sticks as 2048MB I went in to msconfig and checked the limits, they are not set. I tried resetting the CPU and RAM sticks 3 times, the CPU has no pins to be bent (flat contacts, I5) I rearranged all the RAM. I have separate video memory from the system memory. I have a 64 bit OS (I am 100% certain) Hardware: Memory: Four Corsair XMS3 TW3X4G1333C9AG Motherboard: Asus P7P55D Pro CPU: Intel Core i5-760 BX80605I5760 Graphics: Two ZOTAC ZT-50401-10L GeForce GTX 550 Ti If anyone has new ideas or knows the exact setting in the bios, it would be greatly appreciated.

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• Should I completely turn off swap for linux webserver?

  - by Poma

  Recently my friend told me that it is a good idea to turn off swap on linux webservers with enough memory. My server has 12 GB and currently uses 4GB (not counting cache and buffers) under peak load. His argument was that in a normal situation server will never use all of its RAM so the only way it can encounter OutOfMemory situation is due to some bug/ddos/etc. So in case swap is turned off system will run out of memory that will eventually crash the program hogging memory (most likely the web server process) and probably some other processes. In case swap is turned on it will eat both RAM and swap and eventually will result in the same crash, but before that it will offload crucial processes like sshd to swap and start to do a lot of swap operations resulting in major slowdown. This way when under ddos system may go into a completely unusable condition due to huge lags and I probably will not be unable to log in and kill webserver process or deny all incoming traffic (all but ssh). Is this right? Am I missing something (like the fact that swap partition is very useful in some way even if I have enough RAM)? Should I turn it off?

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• Compiz & Linux compositing: how does it fit into the X architecture?

  - by Latanius

  Not a really "how to solve stuff" question, but... I was wondering how the modern X architecture works, with compiz & all. What I know about it: in the beginning, there was the X server, clients connected (presumably on TCP), and then sent messages to the server to instruct it to show windows etc. because this didn't work (at all? or just fast enough?) for OpenGL & 3D acceleration, additional APIs were created for direct rendering (DRI? and, in addition to the X server, what things did the X clients talk to to render stuff and through what interfaces?) and, finally, enter Compiz: X clients end up (somehow) rendering to OpenGL textures, which is then put together to form a fancy-looking screen with translucent windows, and rendered to the screen. What I'm especially interested in is what components does the system have and how do they connect to each other? Like... if there is a box labelled "compiz" in the system... is it inside the X server? If it's not, how do the rendered images from the apps end up in it? And where does it render to? Is that another X server? Or DRI? Of course, I'd be equally happy if pointed to some docs capable of clearing up the confusion described above (conditional on they being significantly shorter than book-sized entities).

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• 5 year old server upgrade

  - by rizzo0917

  I am looking to upgrade a server for a web app. Currently the application is running very sluggish. We've made some adjustments to mysql (that's another issue in itself) and made some adjustments so that heaviest quires get run on a copy of the database on another server was have as a backup, however this will not last that much longer and we are looking to upgrade. Currently the servers CPUs are (4) Intel(R) XEON(TM) CPU 2.00GHz, with 1 gig of ram. The database is 442.5 MiB, with about 1,743,808 records. There are two parts of the program, the one, side a, inserts and updates most of the data. Side b, reads the data and does some minor updates. Currently our biggest day for side a are 800 users (of 40,000 users all year) imputing the system. And our Side b is currently unknown, however we have a total of 1000 clients. The system is most likely going to cap out at 5000 side b clients, with about a year 300,000 side a users. The current database is 5 years old, so we can most likely expect the database to grow pretty rapidly, possibly double each year (which we can most likely archive older records if it comes to that). So with that being said, should we get a server for each side of the app, side a being the master, side b being the slave, any updates made on side b are router to side a. So the question is should i get 2 of these or 1. 2 x Intel Nehalem Xeon E5520 2.26Ghz (8 Cores) 12GB DDRIII Memory 500GB SATAII HDD 100Mbps Port Speed And Naturally I would need to have a redundant backup so it could potentially be 4 of them.

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• How can I assign DHCP leases from a script?

  - by devicenull

  I have an environment where there is one DHCP server servicing a number of different hosts/vlans. The switches are configured to forward the DHCP requests over (via ip-helper) and include information about the port (option 82). I'd like to take that information and translate it into an actual lease for the server. I don't think it's particularly feasible for me to pregenerate a list of available leases, but I should be able to determine an address for a lease as it comes in. Is there an DHCP server that can execute a script when it receives a request? (Note: I'm looking to assign the IP from the script, not have the DHCP server assign an IP then execute the script) Edit: So, ultimately I'm trying to provide DHCP/PXE services over a large number of distinct vlans. This is so we can do OS installs via PXE booting without having to have a separate PXE vlan. I've got the switch config down no problem, and I have the DHCP server recognizing option 82. I need a way to pull DHCP assignments from another system (this other system would know what subnet to use on what vlan), but I do not want to have to pregenerate a list of vlan:DHCP range pairs.

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• Applications are being opened by IE instead of running normally

  - by Star

  I rewrote the Question to add everything that i tried so far. Many of my applications are being opened by Internet Explorer. (not all) For example when I run Firefox.exe (from shortcut) I get IE run instead, with the following URL http: // %22d/ Browser/firefox.exe%22 (I added spaces to prevent link creation) the shortcut target is: "D:\Browser\firefox.exe" when I attempted to open firefox.exe from it's folder the results were the same as the previous one I attempted to open it by cmd, so i navigated with cmd to the FF path then wrote: firefox.exe the was the same except that the URL was: http: // Firefox.exe/ when i jsut write firefox the result URL was: http: // Firefox/ (is it some kind of parameter or something??) trying the same with chrome resulted the same results as the previous tests. I tried creating a new user (adminstartor) but the problem still there. I tried every registry key with exe on it (not sure if i tried them all) no change I tried removing IE but came back by itself somehow, meanwhile IE is removed, FF and its fellow apps gave me open with window I tried reinstalling the applications but it just no use. Time Line: (as requested from @Daredev) I don't know when it happened because the computer is for the company i work for and it was like that since i got it. (The IT there gave up on the problem lon time ago!). applications were installed already are "firefox" and "XPS viewer" . applications were working after the problem everything except what uses browsing (MS help viewer, XPS viewer, firefox-even I've re installed it-, opera, chrome) that what I thought but after installing Maxthon , comodoDragon this theory was blown away. system info: 1- windows xp professional service pack 3 2- system fully patched: Yes 3- anti-virus up to date: Yes 4- same behavior when booting into safe mode: Yes

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