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• JFFS2 poor mount performance

  - by Marcin Polkowski

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

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• Optimal Instance Size for EC2 Sharepoint Server

  - by Rob Wilkerson

  I'm surprised that I can't find any info about this, but I'm not a Windows admin and just a novice EC2 user. I have a client who wants to stand up a Sharepoint server on EC2 for internal use. The team is small (10-20) folks and traffic will be light. Mostly, the client is looking for one place to store documents (and revisions of documents) while making access easy for authenticated users anywhere in the world. They've settled on Sharepoint and have other EC2 instances so that seems like the natural fit, but I'm trying to figure out what to recommend for them. I'm currently thinking about a Medium instance. I'm afraid to go smaller because I think Windows would need a fair amount of memory just to run, but I'm very open to suggestions. Any advice would be much appreciated. I expect that the storage itself would happen in an EBS mount, but again, suggestions welcome. Thanks for your input.

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• How to diagnose a Windows XP hard crash

  - by Jon

  I have a 64-bit Windows XP machine which has hard crashed several times today. The symptoms are that the screen just goes blank, then the reboot cycle starts. There is no blue screen and even though it is switched on, no crash dump file is created. On all occasions it has happened during a period of high CPU/memory activity. I have run a full Dell diagnostics with no failures. Any ideas how to track this down further? Thanks.

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• Painless way of consolidating files across multiple machines/OSes

  - by 5arx

  Just bought a NAS. So I thought I'd get all our photos, media files and pdfs consolidated, de-duplicated, de-junked and virus-checked and stick them all on it. We have 3 laptops, one running Windows, the others OSX. We have a file server running Windows - it was the result of an earlier attempt at a networked fileserver - and a Mac Pro that is also kind of a server (previous attempts at this job have resulted in most of our stuff being on it). Also memory cards/sticks, cd backups and so on. I would be grateful if anyone could suggest a strategy or, ideally, tool(s) I could use to solve this problem. It is probably no more than one or two terabytes of data in total, but I can imagine that going through it all manually, file-by-file may well drive me insane.

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• Issue with Visual C++ 2010 (Express) External Tools command

  - by espais

  Hi all, Normally we develop in VS 2005 Pro, but I wanted to give VS 2010 a spin. We have custom build tools based off of GNU make tools that are called when creating an executable. This is the error that I see whenever I call my external tool: ...\gnu\make.exe): *** couldn't commit memory for cygwin heap, Win32 error 487 The caveat is that it still works perfectly fine in VS2005, as well as being called straight from the command line. Also, my external tool is setup exactly the same as in VS 2005. Is there some setting somewhere that could cause this error to be thrown?

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• ASA Slow IPSec Performance

  - by Brent

  I have a IPSec link between two sites over ASA 5520s running 8.4(3) and I am getting extremly poor performance when traffic passes over the VPN. CPU on the device is 13%, Memory at 408 MB, and active VPN sessions 2 so the load on the device is particularly low. Screenshot of wireshark file transfer between the two hosts over the VPN: The large amount of Header checksum failures is alarming, but I am not sure what to check now. I perf is showing around 4-5 Mbit/sec with differing TCP window sizes. Show Run on the ASA http://pastebin.com/uKM4Jh76 Show cry accelerator stats http://pastebin.com/xQahnqK3

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• How do I pick a motherboard?

  - by EpsilonVector

  When building your own computer one part was always a mystery to me: the motherboard. Picking a CPU/GPU/memory is easy- you just figure out where the various chips are in the low end to high end scale, do a little market research on what current games demand, and pick the parts from their respective continuums of low-to-high-end models. A mother board is more complicated though. Its features are not as obvious as "this motherboard is faster than that motherboard". Now you need to deal with part compatibilities, bus speeds, maybe power management stuff, etc. I'm interested in a short guide for selecting a motherboard, especially- what pitfalls to avoid (for example, can bus speed become a bottleneck?). To clarify: I'm not looking for motherboard recommendations. I'm looking for guidance regarding how to evaluate the fitness of a motherboard given the rest of the computer parts.

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• Is it possible to run an old 16-bit DOS application under Windows 7 64-bit? [closed]

  - by NFX

  Possible Duplicate: Why 64 bit OS can't run a 16 bit application? How do I get 16-bit programs to work on a 64-bit Windows? Here at work my new development machine is Windows 7 64-bit (so I can use extra memory and run VMs). However I have a dilemma: it appears that 16-bit DOS programs do not run under Windows 7 64-bit. I have an old legacy program written in Clipper that I need to run periodically. I cannot access the compatibility setting as Windows 7 just greys them out.

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• How full is too full for mechanical hard drives?

  - by Sunny Molini

  I have heard many claim that it doesn't matter how full a drive is until it starts cutting into temp and virtual memory space. This doesn't make sense to me, given the nature of how the data is transacted on a hard drive. The inside of the platter presents less data per revolution than the outside of the drive does, by significant factors. The inside 40% of the radius of full size hard drive is used for the spindle, so only the outside 60% is used for data storage, but that still means that the inside track of a hard drive presents data 60% slower than the outside track. By my calculation, a Hard drive that is only 10% full should perform about 2.25 times faster than a hard drive that is 90% full, assuming that the flow is constrained by other factors. Am I wildly off base here? For all the drives I know, even the top speeds of the first 1% of the drive would be well within the bandwidth provided by a SATA 2 connection.

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• Is there a way to get the size of Outlook Calendar meeting items?

  - by bethlakshmi

  In our Exchange environment, our company caps the size of an Exchange account at a certain size. That size is the sum of all the exchange related stuff stored on the server - includign both the Inbox and the Calendar. I can tell with the Mailbox properties, Folder Size... window that my Calendar is a good 50% of my account's footprint. Is there any way to get a more detailed view of what meetings in the Calendar are taking up the space? Given the general pattern of incoming mail, it's my belief that 2-5 meetings are responsible for 75% of the memory consumption... I just need to find which meetings are the problem... and with my current calendar, it's a bit like finding a needle in a haystack. Anyone got a trick for this?

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• How to version large binary files?

  - by Walter White

  I run Windows XP inside a virtual machine for some tasks. I attempted to use git to version the image for virtual box; however, it is about 6GB after all the service packs. I only have 6GB of ram and git bombs out saying it is out of memory. I would basically like to have snapshots of Windows so that I can simply blow away an image and start anew when I want to. I like to have something I can rollback to in the event that an upgrade doesn't work so I would prefer to use version control or snapshots if the filesystem supports it. Any ideas on what tools I can use to do that?

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• Rolling desktop recorder?

  - by lance

  I want a piece of software that will constantly record what I'm doing on my desktop, discarding footage that's over [30] seconds old. Its recording would be a rolling one. The idea is that I can somehow hit a button and see "what just happened". I don't want to have to babysit it. That is, I don't want a piece of software designed for screencasting (which I'm not trying to do). My bias against that is based on my (maybe incorrect?) assumption that I'd regularly have to start/stop the recording throughout the day. The idea is that this piece of software would consume fewer resources (than a screencast recorder) on my box, as it's only keeping a very limited amount of footage in memory (and low quality would even be acceptable), because it's discarding frames fairly quickly after they're captured. Where can I find a piece of software with features like this?

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• server performance metrics report and practicality

  - by Anjesh

  I have a need of preparing web server (apache-php) performance report containing important metrics like CPU usage, disk io, memory usage on user basis. Couple of domains are hosted in the same server and they run from separate users using fcgi. The reason being sometimes some hosted applications take lots of cpu usage, making the server slow for other applications (running as separate users). i am planning to develop scripts for this, as i can't seem to find any simple utilities for this purpose. This script will take snapshots of the user wise metrics at defined periods say 15 minutes and record it. Any abnormalities will be reported via emails. How practical is that? also would be interesting to know what else need to be recorded.

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• windows VPS running apache and mysql, php scripts running slow.. but cpu usage is 1-3%..

  - by Roeland

  So every night I run some cron jobs. It requires probably about 20 min to process all the records. I gather the script does something like 10,000 sql queries. I figure this task was just that intense and needs time to complete, but I looked at CPU and memory usage, and it is super low. Cpu usage is between 1-3% and once in a while will bounce to 50ish for 2-3 seconds. This VPS is running windows 2003 server with Apache and MySQL. Does this sound right?

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• Tomcat access logs - are failed requests included?

  - by Maxim Eliseev

  We have a RESTful web service (Java, hosted in Tomcat on Ubuntu on Amazon EC2). From time to time it fails (not every week). When it fails, Java CPU consumption goes to 100% and it takes all available memory. It does not finish by itself. I have to restart the server. There is nothing suspicious in Tomcat access logs. I guess one of our users could submit a very "heavy" request which brought the server down. Is it possible this request is not in Tomcat logs since it never finished?

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• how to disable moving down on Enter key in Excel 2007?

  - by earlyadopter

  There used to be a check-box in preferences in Excel 2003 to disable moving down on Enter key after you edited a cell. Where could I find that setting in Excel 2007? <whining on>It drives me insane how microsoft trashes users skills and "fingers" memory to make what their new users may be will find easier. What about us, using these products for ten years?<whining off> I want to control moving around with arrow keys, and Enter to only return me from the cell editing mode to navigation, not moving down. I'm not in a data entry business!! I'm analyzing data, editing just few cells time-to-time.

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• Ubuntu server 11 showing weird characters on console

  - by andySF

  I've installed Ubuntu server 11 after my last hard drive failed to perform. The install process and GRUB screen are OK but I have a problem with the console. I attached two photos because it's difficult for me to describe this issue. I have little knowledge about Linux. My server is used for git, file server, print server. I played with this command dpkg-reconfigure console-setup but no effect. It's nothing physicality wrong with my display or my memory(it's on board). I have run a memtest, and besides that withe the previous version of Ubuntu I've had no problems. The problem.

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• Firefox Task Manager [closed]

  - by chris Frisina

  CLOSED!??? I SPECIFICALLY said for OSX, and the previousquestionprovides answers for Windows and other addons are for older versions of FF, or do not answer the question. This is a specific question for OSX. Chrome has a built in task manager under "Tools" to look at the process within Chrome, extremely beneficial in locating a stuck page. What is the similar feature in firefox? I need to identify what is causing it to run slowly, and the addons they suggested dont work for OSX or are outdated, and Chrome's about:memory isn't recognizing FF FF Version 17.0, OSX version 10.8.2 Build 12C3006 How to get to Task Manager: Task Manager: THIS IS NOT A DUPLICATE OF: Possible Duplicate: “Task Manager” addon for Firefox?

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• Virtual Windows Servers and Pagefile location [closed]

  - by Luke Puplett

  Considering that Windows makes heavy use of the pagefile even with huge amounts of RAM available, is it not best to have this pagefile on the fastest disk possible as close to the virtual systems as possible? I'm thinking, RAM disk. Where I work, storage for VMs is out on a NAS/SAN. I'm worried that so much memory access is having to go across the network! As a side, I think its about time MS got rid of paging and told us to buy more DIMMS. UPDATE So this question has been downvoted??! Accessing a local spindle is C40,000 times slower than a DIMM, so going over the network will be even slower for hard faults. I don't know why I got the downvote, I'm certain that this is an issue unless there's some other mechanism in ESX/HyperV that manages this.

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• What do you do with a 15 node decommissioned Itanium cluster?

  - by Gomibushi

  We are decommissioning a 15 node Itanium cluster. We don't know what to do with it. Being geeks we want to put it (or its individual nodes) to some cool use, but since it is Itanium we are a bit unsure what that could/would be. We are not bringing it back as production servers and we are considering giving them away, if anyone wants them. It's not the most spiffy hardware, but being 2U rack servers they pack an ok amount of cpu and memory, they're about 3 years old perhaps. Ideas to what runs well on them? Or something one can use them as?

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• Explanation of nodev and nosuid in fstab

  - by Ivan Kovacevic

  I see those two options constantly suggested on the web when someone describes how to mount a tmpfs or ramfs. Often also with noexec but I'm specifically interested in nodev and nosuid. I basically hate just blindly repeating what somebody suggested, without real understanding. And since I only see copy/paste instructions on the net regarding this, I ask here. This is from documentation: nodev - Don't interpret block special devices on the filesystem. nosuid - Block the operation of suid, and sgid bits. But I would like a practical explanation what could happen if I leave those two out. Let's say that I have configured tmpfs or ramfs(without these two mentioned options set) that is accessible(read+write) by a specific (non-root)user on the system. What can that user do to harm the system? Excluding the case of consuming all available system memory in case of ramfs

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• Does aria2 support write small files in batch?

  - by Jon

  I'm using aria2 to download 8 million jpg from flickr. Each image is about 100KB. I got a list of urls of these images in a txt file, the format is: http://farm2.staticflickr.com/1070/1151334893_5a8e7f77f4.jpg I'm wondering whether aria2 support writing small files in batch? Say write 100 image to disk when all of them are download in the memory, not just write every single file when the download is finished. Because I think writing in batch will better protect my hard disk. Or do you have other software or opensource code to recommend?

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• Apache crashing at random intervals. Can not find a reason in log files

  - by Nick Downton

  We are having an issue with a VPS running plesk 9.5 on ubuntu 8.04 At seemingly random intervals Apache will disappear and needs to be started manually. I have checked the apache error log, /var/log/messages, individual virtual host apache error files and cannot find anything that coincides with the time of the failure. dmesg is empty which is a bit odd. We have also had the psa service go down for no apparent reason but apache stay up. I'm at a loss to diagnose this really because all the log files I can find do not point to any issues. Are there any others I can look at? Memory usage sits at about 55% (out of 400mb) and it isn't a particularly high trafficed server. Any pointers as to where else I can find out what is going on would be very much appreciated. Nick

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• Does disabling BIOS shadowing increase free RAM space?

  - by user32569

  Hi, I know in these days this is very stupid question, but for study purposes. I read that when PC starts, CPU is set to read adress just under the 4GB. There should BIOS be mapped to by memory controller. My question is, in old days, had disabling BIOS shadowing actually freed some RAM for you? I mean, even when BIOS was not shadowed to RAM directly, still adresses for BIOS MMIO access were wasted. And when you cant adress it, its like there is no extra space gained.

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

  - by Jimm

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

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