IO or I/O is a common shorthand for referring to Input and Output

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I/O Device Error

I have an external hard drive enclosure that I currently have an internal hard drive hooked up to, which was working fine up until now It is like the computer won't recognize it and when I attempt to ...
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Thinkpad Yoga “Disk I/O Error” (Linux)

My machine is sporadically remounting the SDD readonly due to a "Disk I/O Error". This seems only to happen when I connect to the laptop to a power source or after resuming from suspend. The SSD ...
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49 views

Mac SSD freezing & I/O error

6 months ago I've added a SSD (Samsung 840 Pro 512GB) on the back of the superdrive and enabled TRIM. It's still as fast as it was when I bought it. Since some days my mac randomly freezes twice a ...
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5 views

Writing to subfolder is faster than writing to its parent

I use dd to measure write perfomance and observed something strange: writing to /data/emzed2 is faster than writing to /data. This is the way I measured the performance: $ dd if=/dev/zero ...
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16 views

limit/cap total disk I/O to temporarily improve Windows stability on faulty hardware

Is there a way to limit/cap total disk I/O on a Windows 7 system? Processes like git and McAfee sporadically crash with InPageError (for files on different physical drives), seemingly most often when ...
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33 views

List contents of zip archive via stdin

Is there a "magic" way to list the contents of a Zip archive piped in via stdin? For instance: $ some_process_sending_files_in_one_zip_stream_to_stdout | gunzip -l - ... listing of files ... When ...
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204 views

Linux BFQ Scheduler with SSD

In the past I had always been advised by resources that I can get a performance boost when using SSDs by switching from the default Linux scheduler CFQ to one such as deadline or noop. Today after a ...
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32 views

Converting multiple files using programs that accepts stdin and output to stdout

I want to convert a list of files in a directory to another directory using some preprocessing programs. I know I can do this for one file: cat "$INDIR/$file" | ./program > "$OUTDIR/$file" And ...
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26 views

How long does it take for Linux to drop caches?

I run the following to clear cached files from the filesystem/system memory: # echo 3 > /proc/sys/vm/drop_caches I'd like to do this on a scripted basis, so that when I do I/O testing to compare ...
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45 views

Understanding iotop

I have a postgresql select query that consumes only 12% CPU, and little to no memory, but it still takes about a minute to run. I immediately tried to check the IO, using iotop. Sure enough, in ...
2
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1answer
79 views

Optimal cluster size for random I/O

I'm specifically interested in the answer for NAND storage (SD cards, memory sticks). I have a Windows 7 laptop where I run 2 VM's inside VMWare, as well as multiple programs in the host OS. VM disk ...
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105 views

Redirect output to console I/O on IAR Embedded Workbench

I have coded a project of mine in C on a Windows machine in the software IAR Embedded Workbench IDE. The project compiles and runs fine. I have a couple of printf functions in my code. But the thing ...
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1answer
79 views

How to lower I/O priority for file copying operations under Linux Mint?

Whenever I copy files from a disk to another on my personal Linux system, the OS stops responding appropriately, the UI starts behaving erratically, any movies I'm playing will freeze and continue ...
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35 views

i/o Bus Standards & Device Controllers

I'm really confused about bus standards like ide,ata,sata,pci etc. I have just read this article :When a disk read or disk write occurs, where does the data go? So if we talk about hard disk drive; ...
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1answer
36 views

Why do subsequent reads of a multi-gigabyte file run faster?

I have some algorithm test software running on a Windows 7 machine which, when run the first time on any given data file, runs ~3-5x slower than on subsequent runs. Our algorithm simply reads the file ...
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53 views

Can random writes to a non-formatted raw partition from linux corrupt the boot loader?

In brief: suppose I create a non-formatted raw partition on my hard drive, and read and write block IOs to and from it using the standard c interface: open, pread, pwrite, etc. Is there any reason why ...
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1k views

Difference between port mapped and memory mapped access?

Can anyone explain what's the difference between port mapping and memory mapping, and what having both accomplishes? Why is there port mapped, how does it differ in structure from memory maps, and is ...
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OSX tilts on creating new dirs, allows new files on external drive

I've an external drive that was working fine until this morning. Now, I'm able to create new files (with copy, touch whatever), but I can not create/move new directories. Any ideas? $ mount ...
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75 views

What is consuming my disk?

I have a Win8 64bit Dell XPS One computer that continuously has trouble operating because the disk I/O is at >99%! I need a way to find out what is causing this. The Task Manager is no help because ...
4
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1answer
121 views

No performance increase on I/O intensive operation after symlink to ramdisk

We have a system that transforms a set of several thousand multi-MB files. After every step in the transform, it writes the intermediate file to disk. The concept is similar to a scratch disk. We ...
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25 views

IO performance over a period of time

We use AWS environment at our company and mainly we generate huge amount of data, and there are alot of I/O going on on several thousand files. A collegue is claiming that it looks like generating ...
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68 views

circumvent directory I/O error

I recently recovered a large amount of data from a failed external hard-drive with ddrescue, which did an excellent job. However, after running the tool several times and with different options, it ...
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Windows 7 printing “io” infinitely in all focused input areas

A few weeks ago, my computer started doing this strange behavior. All I did was click into a window that allowed for user input and the computer began printing "io" over and over again (no error, but ...
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How can RAM contain a “memory map” if RAM is unaware of the overall system?

This question concerns hardware more than software. Basically, citing from this article on memory maps, it says that: In computer science, a memory map is a structure of data (which usually ...
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519 views

Keep getting i/o error 1117 while trying the file operations

I am trying to copy a huge file (around 50 GB) to external hard drive. I keep getting the I/O error. I tried all things compressing the file, trying to copy to same drive splitting the file using ...
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334 views

<1MBps 4K read/write HDD issue

I bought a netbook, Windows Starter - it seemed really slow right from the start, so I removed all the bloatware, but it remained slow still. So I tested disk I/O with CrystalDiskMark and got 4k ...
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203 views

Getting i/o statistics of a process per file

I have a process of I would like to monitor the i/o with some precision. I know the PID, but I can't really control the way it is started (so I can't really put a pv-like command in between). What I ...
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449 views

Do computers need any input or output device?

Somewhat inspired by an answer I gave about keyboard lights I now ask this: do computers actually need any sort of input (keyboard, mouse, touchpad, scanner, microphone, joystick, etcetera) or output ...
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2k views

High Disk I/O and CPU usage of System Process in “System Volume Information”

I've a problem with high disk IO and cpu usage from the system process. With the performance monitor I can see that it writes and reads about 100MB/s froM "System Volume Information". I tried to get ...
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354 views

how much does “chown -R” affects disk IO performance? how can I test it?

I'm running a Cent OS server with a NAS storage. I have heard "rm" command makes overall disk IO slow. So, I gave up doing rm -R. I will do rm one by one with a shell script. --EDIT--> rm and sleep ...
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97 views

Windows are unresponsive for a few seconds after boot (probably IO error with HDD)

When Windows is loaded and I am logged in into my desktop, the system gets unresponsive for about 10-15 seconds. During this time, the HDD led indicator at the case is either flashing or on (solid). ...
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60 views

Windows 7 keyboard input hangs while reading from usb hard drive [closed]

There is a strange behavior of windows 7. I like to listen to music while coding (surprising), so I always carry with me my usb storage and play music from it. Sometimes while playing a song it kind ...
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1answer
222 views

What does “Disk active time” mean in task manager?

I've read online that "disk active time" means something like the amount of total time the disk spends on IO activity. I'm kind of confused about what that means. Also, on a virtual machine, what ...
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105 views

I/O error when burning Windows OS to DVD from Image Burn tool

I get the error message below from Imageburn when I try to burn Windows OS to a blank DVD. I want to know whether the cause might be the DVD writer or something else? I tried two blank discs. But I ...
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167 views

iotop complains “CONFIG_TASK_DELAY_ACCT not enabled in kernel” only for specific process

I'm trying to use iotop to determine whether the CPUs are waiting on I/O at any point for a specific program called bwa (it's a next-generation sequence alignment program). If I start iotop without ...
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1answer
141 views

How does the number of files in the same folder affect I/O performance in an ext4 filesystem

I'm using Kyoto Cabinet (a key-value store) for my project. The specific type of DB I'm using is DirDB which creates a lot of files in a directory to store the key-value pairs. The server I'm running ...
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2answers
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Windows 8 System.exe writes to HDD like crazy

I have checked Application event logs and found that every second about 20 entries for MSSQL Server were recorded. Removed the server and all its components and the problem is gone... Thanks everyone ...
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360 views

How to to measure and monitor I/O performance

We have a linux cluster with worker nodes sharing a common remote file system. We want to optimize the I/O, in particular when the workers read from the remote fs. The starting point is to measure ...
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Windows 8 extremely high disk usage and slow IO

Problem After upgrading from Windows 7 to Windows 8 Professional, there seem to be a few disturbing problems. When I have the Task Manager open, I sometimes notice the disk usage climbing to 50, ...
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293 views

Why are some computers are slow during file copy process?

I have a modern laptop (quad-core i5 2.5GHz, 4GB RAM, ) at work. But it is very slow and unresponsive when I copy files in the background.On the other side, at home I have a simple 2-core PC (E2180 2 ...
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928 views

nginx configuration forvideo streaming server

I run nginx for few websites and for video streaming using h264 module from code-shop.com. When I start or restart nginx it works normally for a while after it starts generating very high load ...
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663 views

Windows 8 External Hard Drive Enclosure Uselessly Slow

I have just upgraded my operating system to Windows 8, and am trying to use my external hard drive enclosure. However, when I try to use it, it is uselessly slow. Often times Windows explorer will ...
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284 views

How to prevent I/O hiccup caused by single process?

I'm looking for a way to prevent single process from slowing whole desktop system (ubuntu 11) by massive disk I/O. Is there any tool that would allow to limit disk operations rate per process or even ...
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559 views

What is the purpose of frequent I/O operations on “/Device/Mup” on windows?

For example, from Process Monitor app: There is very little web information about it suprisingly; not even about what "\device\mup" is. edit: Further information: Command Line of process ...
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286 views

How does FileStream appends physically works?

I was dealing with a prepending problem and suddenly leads me to think about this question.... Maybe not only related to FileStream, I want to know how we actually appends binary into a file ...
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591 views

How can I set deadline as the I/O scheduler for USB Flash devices by using udev rules? [duplicate]

Possible Duplicate: Udev rule is not working I have set CFQ as the default I/O scheduler. I often get bad performance when I write data into a Flash device. This is resolved if I use ...
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Why is System writing to disk and MsMpEng.exe reading?

Just a curiosity question. I just told Spotify to move its cache from one drive to another. When I now look at the Resource Monitor spotify.exe doesn't seem to be doing anything at all basically. ...
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117 views

Clean Multi X Server Setup

I want to spawn a second X Server for my TV and use a Media Station software like xbmc over it. Is it best practice to manage multi x instances from xinit or is there another/better way? Apart from ...
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Intermittent hard disk I/O errors

For the past 2 years or so (4 year old custom build) I've been getting random moments where everything stops responding (or takes a very long time to respond) followed by I/O and HDD not detected ...
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Full list of top-like tool family for perfomance monitoring in linux: iftop iotop htop atop more? [closed]

Top-like utilities are extremely handful in my work and I want to make sure I am not missing any of them. Please extend the following list of performance monitoring (top-like) family of linux tools: ...