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• How to get the best LINPACK result and conquer the Top500?

  - by knweiss

  Given a large Linux HPC cluster with hundreds/thousands of nodes. What are your best practices to get the best possible LINPACK benchmark (HPL) result to submit for the Top500 supercomputer list? To give you an idea what kind of answers I would appreciate here are some sub-questions (with links): How to you tune the parameters (N, NB, P, Q, memory-alignment, etc) for the HPL.dat file (without spending too much time trying each possible permutation - esp with large problem sizes N)? Are there any Top500 submission rules to be aware of? What is allowed, what isn't? Which MPI product, which version? Does it make a difference? Any special host order in your MPI machine file? Do you use CPU pinning? How to you configure your interconnect? Which interconnect? Which BLAS package do you use for which CPU model? (Intel MKL, AMD ACML, GotoBLAS2, etc.) How do you prepare for the big run (on all nodes)? Start with small runs on a subset of nodes and then scale up? Is it really necessary to run LINPACK with a big run on all of the nodes (or is extrapolation allowed)? How do you optimize for the latest Intel/AMD CPUs? Hyperthreading? NUMA? Is it worth it to recompile the software stack or do you use precompiled binaries? Which settings? Which compiler optimizations, which compiler? (What about profile-based compilation?) How to get the best result given only a limited amount of time to do the benchmark run? (You can block a huge cluster forever) How do you prepare the individual nodes (stopping system daemons, freeing memory, etc)? How do you deal with hardware faults (ruining a huge run)? Are there any must-read documents or websites about this topic? E.g. I would love to hear about some background stories of some of the current Top500 systems and how they did their LINPACK benchmark. I deliberately don't want to mention concrete hardware details or discuss hardware recommendations because I don't want to limit the answers. However, feel free to mention hints e.g. for specific CPU models.

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• Snow Leopard Hangs at Login Window

  - by jessecurry

  I've had an issue for the past few months, but I rarely restart so it hasn't caused too much trouble. Basically, when I start up my Mac (iMac10,1 - 3.06GHz Intel Core 2 Duo, OS X 10.6.3) everything proceeds as usual until I reach the login window. The login window displays normally, but keyboard and mouse input seem to be ignored. This condition persists for around 5 minutes at which time everything goes back to normal. While the login window is frozen my second monitor appears entirely blue, the second monitor receives a background as soon as the login window becomes responsive. If I startup while holding SHIFT the problem still occurs, but the freeze is much shorter. Looking through my logs I see no activity during the time that the login window is frozen. I've attempted to repair disk permissions, and gone through every possible maintenance option in Cocktail.

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• PC reboots spontaenously: debugging tips

  - by aaron

  I swapped my core 2 duo for a quad core recently, and generally things run fine, but every now and then my computer just restarts. I don't even get a blue screen (Vista 32). Core temp isn't a problem. My thinking is that my power supply is inadequate, but I haven't been able to test that (one idea was to under clock the cpu to see if that helped, but going up in speed was the only simple thing to do in the BIOS) Two cases where I semi-consistanly get problems: - Borderlands windowed after some period of time (and some other games, but Borderlands does it pretty regularly) - watching a video (e.g. quicktime/vlc) and having another video running Another thought is non-cpu heat? Maybe the graphics card? Any thoughts on how to track this down appreciated. Thanks!

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• Can't display at full resolution on an external monitor from my MacBook.

  - by Ramblingwood

  I have a 24" Asus V246H and a new MacBook ($999 one). I am trying to display to display to my Asus at 1080p via VGA. So I boot up with the lid closed and the external monitor plugged in. Everything boots up fine, but the resolution is really low. So I go in and change the resolution to be 1920x1080. My monitor then has a blue box on it that says "OUT OF RANGE". Lower resolutions like 1024x768 work, but 1680x1050 doesn't. If I try mirroring my displays, the entire external monitor AND the entire laptop screen is completely garbled. I can make out some colors, but it is completely unusable. I am suspecting that it simply won't work via VGA, but I don't want to buy another adapter, and my PC is using the DVI port. Any solutions?

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• memtest incorrectly recognizes my RAM

  - by Brendan Abel

  I recently built a computer and randomly got a couple blue screens. I've run memtest and one of the memory sticks consistently throws memtest errors, while the other does not. The odd part is, memtest lists the following settings for my RAM: RAM: 535 MHz DDR 107 / CAS 2.5-1-3-1 DDR1 128 bits But my RAM is DDR3 1600? Memtest also lists my cpu as AMD K8, even though it's K10. I've probably going to RMA the ram stick, but I just wanted to see if anyone had any insight into the weird memtest stats.

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• Windows XP failing to set theme correctly on auto-login

  - by Alois Mahdal

  On several testing machines we have, when automatic login (as Administrator) is activated, Windows fails to set theme (Display properties - Themes) correctly. Particularly, even if theme is set to "Windows Classic", visually it's obvious that "Windows XP" is applied (the one with blue title bars and red "X" butons). I have only seen this happen when Auto-login is set--we always use Administrator on XP. Even if I log out and back in manually, theme is set correctly. Apart from logging out and in, it's also possible to reset theme in "Display properties". It does not happen in 100% of the cases, but it's way over 50%. Definitely it's often enough to be annoying. I believe this is a bug in Windows XP. I have never encountered it on other Windows versions. Does anybody know how to avoid this issue once forever? (Or can anybody provide explanation, relevant links, etc.?)

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• Software RAID for several HDs which retains files on each HD

  - by Fuxi

  Is there some kind of software/driver that would enable me to create one big volume out of several hard disks but retain the file structure on each HD? This would be in case where one hard disk crashes and only data on that HD will be lost. Windows 7 enables me to do that but in case one HD breaks all data will be lost.

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• Linux - quota per directory?

  - by depesz

  I have following scenarios: Single partition mounted as /, with lots of disk space. There is a range of directories (/pg/tbs1, /pg/tbs2, /pg/tbs3 and so on), and I would like to limit total size of these directories. One option is to make some big files, and then mkfs them, and mount over loopback, and then set quota, but this makes expansion a bit problematic. Is there any other way to make the quota work per directory?

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• Set process priority to High: Dangerous?

  - by eek142

  I have read that setting something to realtime is a big no-no, so I am not going to do that. But I do have an application that I need to make sure always has the highest priority on my system as it is critical for the rest of the applications I am running. Is there any danger in setting the priority to high, which is one level below realtime? Also, how would I be able to do this by changing the shortcut target? What is the command?

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• Hard drive not detected after installing the Operating System

  - by Eka Anggraini

  After I failed to install SUSE Linux 10.0, I want to go back to the windows operating system again. but when I want to install windows, my hard drive is not detected, whereas in the BIOS in the detection / known. I was dizzy, his mistake about it. Where is. I was looking for, my problem is named after the Blue Screen of Death (BSOD) that is an error message from windows to prevent further damage, but with various types of error messages, one of them as I have *** STOP: 0X0000007B (0XF896A524, 0XC0000034, 0X00000000, 0X00000000) I do not know, where the system is broken. but why hard drive is not known ... at the time of going to re-install?

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• Fixing/Extending Standard Windows File Open/Save Dialog [closed]

  - by scunliffe

  Possible Duplicate: Change left side link of the Save As Dialog for a DropBox one? Almost every time I use the standard Windows (XP) File Open/Save Dialog I get frustrated in how long it takes me to navigate to where I want to go. :-( (I won't even get into the MS Office dialog that makes things even worse) This is the dialog I'm referring to (with some notes) Notes: Wouldn't a Drive list be handy in here? C:\, D:\, E:\, etc. What about a breadcrumb URI? (the magenta list of links) Why isn't Program Files one of the icons on the left? (green) I'm always going in there for something Why can't I type "../../../" to navigate up multiple directories in the File name box? (blue) There has got to be some utilities out there that can "hijack" or "overwrite" this core windows dialog to provide a much better set of options. I'm looking for any/all solutions to help fix this dialog.

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• How can I get my Sapphire Radeon 7850 to output in "1080p"?

  - by Fr33dan

  I have a Radeon 7850 connected to a Vizio 3D compatible TV. The TV has a function to parse and display SBS encoded content. On my old graphics card (a Radeon 5770) I just had to select the 1080p option in the catalyst control center. In this mode my TV reported the output mode as "1080p", with the new card the TV reports "1920x1080". I cannot figure out what the difference in between the 2 signals but the "1920x1080" cannot be switched into 3D mode by the TV. Weirdly, before windows starts the (in the Bios and so forth) the computer outputs in "1080p" so I know the card is capable of it. As soon as the blue login screen comes up though it changes back to the "1920x1080". I've tried everthing I can think of. Updated my drivers from 13.3b3 to 13.4, then even tried the 13.5 beta (Which I'm still on this moment). Tried all the "optimized" HD settings in catalyst, even the 720p modes show the resolution from the TV and not the "720p" (which it used to do on the old card when I had to lower the resolution of games)

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• Colors less saturated in Snow Leopard Finder, Preview & Safari than in Chrome -- why?

  - by Andrew Swift

  If I look at the picture here in Safari, Preview or the finder, the shades of blue are significantly different than if I look at the picture in Google Chrome (they are less saturated than in Chrome). Since I am a photographer and need to prepare pictures for publication online, I need to know what a jpeg should really look like, in order to color-correct it. I have an excellent Eizo monitor that is correctly calibrated. If I open the same image in Photoshop CS3, I get the Chrome colors if I use Monitor RGB under view proof setup, and I get the Safari colors if I use Macintosh RGB. Can anyone explain the difference between these two settings, and the difference between Safari and Chrome? Which colors are correct? Photos that I prepared under Windows (during the past five years) now seem washed out in the Apple Finder and Preview, even though I had correctly prepared them. Is there a setting on the Macintosh for color calibration, besides the monitor calibration control panel?

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• Reenabling the Spotlight Menubar item in Mac OS X 10.6

  - by Tim Visher

  I believe I followed the instructions here to disable Spotlight indexing and remove the menubar item. I reenabled indexing just fine, but when I changed the permissions back to 744, the spotlight search position came back (as in the space it would normally occupy), but the actual icon and search box will not show up. If I click that portion of the screen I get a blue box, but I can't type anything in to anything. Currently, permissions look like this: [~]$ ll /System/Library/CoreServices/Search.bundle.bak/Contents/MacOS/ total 648 -rwxr-xr-x 1 root wheel 835K Sep 17 14:48 Search* ll is an alias mapped to the following alias ll='${LS_PREAMBLE} -hl' with $LS_PREAMBLE [~]$ echo $LS_PREAMBLE ls -GF (Ignore the .bak extension. I decided that until I found a way to fully restore it, I would just remove it entirely following the directions here) That looks right to me and obviously something is launching, but the UI elements aren't there. So how can I restore it? Thanks in advance!

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• Why is domU faster than dom0 on IO?

  - by Paco

  I have installed debian 7 on a physical machine. This is the configuration of the machine: 3 hard drives using RAID 5 Strip element size: 1M Read policy: Adaptive read ahead Write policy: Write Through /boot 200 MB ext2 / 15 GB ext3 SWAP 10GB LVM rest (~500GB) emphasized text I installed postgresql, created a big database (over 1GB). I have an SQL request that takes a lot of time to run (a SELECT statement, so it only reads data from the database). This request takes approximately 5.5 seconds to run. Then, I installed XEN, created a domU, with another debian distro. On this OS, I also installed postgresql, with the same database. The same SQL request takes only 2.5 seconds to run. I checked the kernel on both dom0 and domU. uname-a returns "Linux debian 3.2.0-4-amd64 #1 SMP Debian 3.2.41-2+deb7u2 x86_64 GNU/Linux" on both systems. I checked the kernel parameters, which are approximately the same. For those that are relevant, I changed their values to make them match on both systems using sysctl. I saw no changes (the requests still take the same amount of time). After this, I checked the file systems. I used ext3 on domU. Still no changes. I installed hdparm, and ran hdparm -Tt on both systems, on all my partitions on both systems, and I get similar results. Now, I am stuck, I don't know what is different, and what could be the cause of such a big difference. Additional Info: Debian runs on a Dell server PowerEdge 2950 postgresql: 9.1.9 (both dom0 and domU) xen-linux-system: 3.2.0 xen-hypervisor: 4.1 Thanks EDIT: As Krzysztof Ksiezyk suggested, it might be due to some file caching system. I ran the dd command to test both the read and write speed. Here is domU: root@test1:~# dd if=/dev/zero of=/root/dd count=5MB bs=1MB ^C2020+0 records in 2020+0 records out 2020000000 bytes (2.0 GB) copied, 18.8289 s, 107 MB/s root@test1:~# dd if=/root/dd of=/dev/null count=5MB bs=1MB 2020+0 records in 2020+0 records out 2020000000 bytes (2.0 GB) copied, 15.0549 s, 134 MB/s And here is dom0: root@debian:~# dd if=/dev/zero of=/root/dd count=5MB bs=1MB ^C1693+0 records in 1693+0 records out 1693000000 bytes (1.7 GB) copied, 8.87281 s, 191 MB/s root@debian:~# dd if=/root/dd of=/dev/null count=5MB bs=1MB 1693+0 records in 1693+0 records out 1693000000 bytes (1.7 GB) copied, 0.501509 s, 3.4 GB/s What can be the cause of this caching system? And how can we "fix" it? Can we apply it to dom0? EDIT 2: I switched my virtual disk type. To do so I followed this article. I did a dd if=/dev/vg0/test1-disk of=/mnt/test1-disk.img bs=16M Then in /etc/xen/test1.cfg, I changed the disk parameter to use file: instead of phy: it should have removed the file caching, but I still get the same numbers (domU being much faster for Postgres)

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• How to throttle bandwidth speed from VPS

  - by Burning the Codeigniter

  I was wondering if you can throttle/boost the download speed from my VPS to me, because now and often I download a database which is quite big, typically 5-7GB. My side is quite slow (typically I have max speeds of 100Kb/s) so I was wondering if it's possible to throttle the bandwidth speed from my server to me that it could make the download much faster. If this is possible, how can I do this? My server is running Ubuntu 11.04 with a 100Mbps line.

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• Infotips for Word Documents in Windows XP in Network Drives

  - by Knight Samar

  Hi, MS Word 2007 files have a property page for entering details like summary and title. This is displayed when you hover over the documents on Desktop. Now on my Windows XP SP2 computer, inside Windows Explorer, it shows the special properties for all such files from Desktop, but not from the Network Drives. This is a big problem when I have a large collection of Word documents all in one folder. How can I display these special properties (infotips) for documents in my network drives ? Thanks :)

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• Are there disagvantages to using Outlook's Chached Exchange Mode?

  - by Rax Olgud

  Since I found out about Outlook's "Cached Exchange Mode" I've been using it, and I also set it up on every PC I come across. I think it's a great feature that improves the efficiency of of every Outlook user, and I don't understand why it's not ON by default. My question is - are there any disadvantages to using Cached Exchange Mode? (Besides the obvious fact that it consumes a bit more space, which I don't see as a big issue nowadays)

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• Tool for logging NIC link state events.

  - by Alan B

  Intel NICs have a driver option (in Windows) that will log link state events to the system log, so if the network drops out periodically you can determine that fact. Does anyone know of a simple generic solution that does this, in other words one that is not part of the driver from a particular manufacturer? I know there are plenty of 'big iron' network monitoring tools out there but surely there's something really simple that runs as a service in Windows with minimal setup ? TIA

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• SVN Error when connecting from MacBook

  - by user66850

  This is drying me nuts for last 5 days!!! Out of the blue 5 days ago, SVN access from my MacBook Pro failed: I cannot access any SVN (i.e. not in our University or open source projects etc). The error obtain when performing 'svn co', or any other svn commands is shown below. This is same message is obtained irrespective of the svn repository (i.e. it is something due to my Macbook) svn co http://anonsvn.internet2.edu/svn/i2mi/branches/GROUPER_1_6_BRANCH/ svn: OPTIONS of 'http://anonsvn.internet2.edu/svn/i2mi/branches/GROUPER_1_6_BRANCH': Could not read status line: connection was closed by server (http://anonsvn.internet2.edu)

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• Strange Intermittent Background Sound in Windows 7

  - by NoCarrier

  Ok, this is very strange. Recently, i noticed that every 10-15 seconds, there would be this faint, annoying duh-dum sound coming out of my speakers. (hard to describe. sounds somewhat like the sound windows makes when you unplug a USB device, but not as pronounced and much quieter). I closed every app and ended as many processes as I could, but the sound persists. I look at the volume mixer and sure enough, when the sound occurs, there is a little spike in the level under "System Sounds". I haven't installed any hardware or software in the last several weeks. This started recently - completely out of the blue. Does anyone have any insight?

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• Differences between Cherry mechanical keyboard switches?

  - by TreyK

  I want a comfortable, responsive mechanical switch keyboard. My only concern about mechanical switch keyboards is the noise. Boards based off of the Cherry MX Blue seem to be the loudest, but apparently offer increased tactility. I don't mind a clicky noise (I would actually prefer a bit of noise), I just don't want anything overpowering. What are the different types of Cherry mechanical switches are out there, and what separates one from the other? Also, where would I be able to test one out?

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• my WD Mybook wd5000h0032 is DEAD?

  - by Herudae

  Hello, i have a WD Mybook Premium (wd5000h032) it used to work just fine but suddenly i can't access to it. The blue lights turn on but the drive doesn't start, it makes no click, nor any other sound, it just like if it was disconnected from USB, of course my PC doesn't detect it, i've tried with trhee different USB cables two PCs and one laptop and nothing. Is it really dead? how can i recover the information stored there? i think the problem could be the case, if so, could i take out the disk and connect it as an internal drive? or could i buy another case?

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• Indexing Service filter daemon keeps crashing on Windows XP; something worse underneath?

  - by IVR Avenger

  The Indexing Service filter daemon keeps crashing on my Windows XP Pro machine, with the following error message: Indexing Service filter daemon has encountered a problem and needs to close. We are sorry for the inconvenience. Not a big deal, I can click "Don't Send Error Report" all day. But what's going on, here? Is this a service that I need? Is the frequent crashing indicative of something worse that's happening behind the scenes?

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• Updating windows xp hard drive controller from ubuntu live disk

  - by Joel

  The problem: When booting, I get a blue screen shortly after the Windows XP logo splash screen. The error code is 7b, and the second hex number is 0xC0000034. Based on this link (item 7) it appears the driver should be updated. Oddly, I made no changes to the drivers recently. I suspect it was something in a windows update or the newest upgrade of my antivirus (eset). But I digress. The BSOD makes me unable to boot into Windows at all, so I can't update the driver from there. I've run various bios-level diagnostics (including full surface scan) and the hd looks good. I'm also able to boot to an old ubuntu disk and read files from the hd. The question: Based on the above, it appears that I need to update the Windows hard drive controller from the ubuntu live disk. How do I do that?

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