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

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why does asynchronous I/O require buffering?

I read in some introductory lecture notes on I/O and operating systems that "asynchronous systems require buffering". Why is it so please? Cheers
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12 views

java.exe heavy reading of symantec virus definition

I've noticed that a java application (IBM Webpsphere) is running slower than it used to be and doing a lot of IO. When I opened process monitor I saw a weird behavior: it was reading Symantec virus ...
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8 views

Tool to connect to a file descriptor for I/O

I'm looking for a unix tool which can connect me to a specific file descriptor and do some I/O operations on it, assuming that the user permissions are valid. What could I look to use?
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21 views

Is there a way to get real time stdout and stderr from a process spawned by psexec on the same streams (pipes) as psexec

My question is very close to this question here with an additional constraint related to time-outs I'm using Jenkins to start some automated testing and then to capture the stdout (and stderr) of the ...
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12 views

Linux redirection pipe

I was testing out a kind of backwards indirection and came across this. I'm not specifying the desired behavior as there is none - I just want to understand the results - a sym link to an (unnamed?) ...
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45 views

Debian freezes while intense SSD I/O

I bought an SSD drive (Kingston SSDNow) and installed Debian 8 on it; The system works fine. But today I'm tried to extract a huge tar archive (~8GB) and in the middle of extraction the system just ...
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223 views

Input/output error when reading disk

I did a forced shutdown after my computer froze (on Ubuntu). After turning back on I found a "attempt to read or write outside of disk hd0" error, after choosing Ubuntu on GRUB. I haven then booted ...
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2answers
92 views

How can I retrieve data from a SD Card when photorec doesn't work?

A friend of mine took pictures of a Halloween party with his camera, and when he put the SD card in his computer, some of the pictures went missing. Knowing that I have successfully rescued his HD ...
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1answer
126 views

How to monitor which files lots of data is being written to on Linux?

I can monitor I/O with tools such as iotop. It allows me to identify which processes do how much I/O. Now I'd like to know which files those processes write all that data to. How would I do that? ...
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22 views

High IO on everything?

I have a Linux laptop with 4 GB of RAM and an i5 processor. Most of the time only Firefox and Thunderbird are open and of the 4 GB of RAM about 2.5GB are used and 1GB is 'cache'. Now, whenever I try ...
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36 views

How can I process traffic between 2 instances of NetCat?

I have an utility that make some data transformation between stdin and stdout in both directions (encode / decode), and I want to make a some kind of bi-directional proxy using two nc instances and ...
0
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1answer
40 views

How to check what is causing performance issue

I have inherited a server with some performance issues. It is running node js, nginx, basic MEAN stack. (DB on another server though) Whenever I copied a file (log file with size of around 150MB) or ...
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52 views

Force a process in Windows 7 to store capture in RAM without doing actual I/O operation and writing to the disk

I'm Using Wireshark's cyclic buffers configuration capturing mode: I am sniffing a 10Gig port, and I was expecting Wireshark to work cyclically with buffers on the DDR only, but apparently it ...
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48 views

What does “losing a second of transactions” mean in MySQL?

Setup: Homeserver with Owncloud using MySQL as database. Problem: I/O on server HDD slows sync down to several days per 70k small files. Solution: ...or at least a workaround that I found is to ...
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218 views

I/O error new SSD w/ Windows 7

I searched around for this scenario, but couldn't seem to come across anything. I just bought a new 240gb SanDisk SSD, because my 128gb OCZ SSD died on me. I threw the new drive in, plopped a copy of ...
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57 views

How to catch hdd io killer process?

Sometimes my hdd on desktop PC starts work like crazy, then, in a short time all system starts to freeze, cursor barely moving, and then completely freezes, but hdd keep working non-stop. I have no ...
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1answer
2k views

SVCHOST.EXE (LocalSystemNetworkRestricted) is using almost 100% disk usage?

I'm not running any other program, only Task Manager and Resource Monitor. It made my machine heavily non-responsive, even cursor sometimes jumps here and there and it's not accepting any keyboard ...
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73 views

Would frequently reinstalling Linux distros affect the life of my hard disk?

I have Ubuntu and Fedora Linux distributions on my computer. I try to tweak many things in both of them and many times mess things up. So I normally reinstall the OS to fix it (as a last resort). In ...
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47 views

How to reduce I/O operations to a flash drive?

Background I often use different computers, and for that reason I like to aways keep with me a flash drive with my home directory, with my bash aliases and helpful functions, vimrc, Homebrew ...
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32 views

Bourne shell: how to add prefix string to stderr message?

I'm running a script on a Bourne shell, eg not bash (actually the sh from BusyBox 1.23.2). As asked & answered in this question, I'd like to "catch" error messages issued by commands within my ...
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84 views

Is I/O error sufficient reason to return SSD on warranty?

Several times I’ve encountered heavy disk errors leading to complete system crash, after reboot m/b doesn’t detect SSD till full PC poweroff. Here is log I've managed to display before OS gone ...
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1answer
96 views

Why is my System process doing disk IO?

Sometimes I want to see how much of my resources a program is actually using. But it seems that, often, even though the process is doing a lot it's for example hardly not doing any disk IO at all. The ...
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Determining average i/o file size on my computer

I'd like to see what the average data size is that my computer reads and writes to the hard drive. Many of the SSD benchmarks assume a 4K block of data, but what is my workload averages 16K? How ...
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diagnosing 100 percent disk usage in windows 10

Since updating to win 10, I'm experiencing issues with my disk usage. From time to time (sometimes every 10 minutes, sometimes once every few hours) my system becomes unresponsive because the disk ...
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1answer
118 views

Consistent 100% disk access

I am a developer and on my work laptop it is entirely normal for my disk activity as shown by Task Manager to be 100%. With an average response between 7k-10k ms. This is under relatively simple ...
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37 views

How can I use a Mirrorbow USB25IO board with a MacBook Pro?

I found an IO board in my closet, and I would like to use it with my MacBook pro. The text on the board is "Mirrorbow Electronics USB IO V1.2" I found this link to a manual: ...
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119 views

Btrfs I/O errors - crappy disks or btrfs fault?

I'm using btrfs for quite a long time, but I wasn't using any more advanced features before. Recently I've moved to btrfs on all drives, on all machines, turned on snapshots, raid and all the cool ...
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41 views

How to remove directory with error input i/o devive on hard disk

I have a hard disk with an error i/o. This is caused in a folder which I needed to delete in order to restore things. But deleting the folder gives the error. How can I force to delete this folder? ...
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1answer
157 views

Fail device in md RAID when ATA stops responding

I had created five 1TB HDD partitions (/dev/sda1, /dev/sdb1, /dev/sdc1, /dev/sde1, and /dev/sdf1) in a RAID 6 array called /dev/md0 using mdadm on Ubuntu 14.04 LTS Trusty Tahr. The command sudo mdadm ...
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1answer
830 views

Diagnosing disk i/o errors, failing disk controllers

My PC has been constantly crashing with disk i/o errors recently and I'm trying to diagnose what the cause is before I order any new parts. I have windows 7 installed on a ssd (with truecrypt) and I ...
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166 views

VirtualBox: How much disk i/o speed gain will I gain if I have fixed-size hdd image?

I am running virtualbox on win7 with a dynamically allocated hard disk image. It seems to consume a lot of CPU and be slow on hdd activity. I've heard that not choosing a dynamically sized virtual ...
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10 views

Multiple interaction controls on a single computer

I wonder if there is a way to interact with a single computer using two interaction controls.For example,two people must be able to interact with two different application simultaneously on the same ...
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256 views

What would cause a high `%wa` value when there is nothing performing heavy io?

I have a 92.3%wa value on top right now under linux and when I run iotop -a, I see nothing causing heavy io. What might be the cause of the large %wa value and how can I go about diagnosing this? The ...
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1answer
124 views

Plot the data collected by sar in ASCII

isag in an "Interactive System Activity Grapher" that "displays the system activity data stored in a binary data file by a previous sar". How do I view the data stored by sar in ASCII on a Linux ...
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1answer
34 views

Does LSF io index report NFS io?

We use SONAS for our filesystem on our cluster and I have noticed that the load on SONAS does not necessarily correlate with the value of io on the cluster nodes when I run lsload -l. Is it possible ...
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44 views

How best to iron out disk I/O lag cause?

Running luksCrypt (which I know causes some lag esp. with my -c serpent-xts-plain64 -s 512 -h whirlpool setup) but as of late lag has become very much more noticeable. I use xfs and lvm on this ...
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1answer
42 views

How do i suppress a ssh-add passphrase prompt?

Whenever i run ssh-add in cmd it outputs a passphrase prompt. ssh-add "%~%\.ssh\id_rsa" Enter passphrase for C:\Users\Kristian Welsh\.ssh\id_rsa: I would like to suppress this text to add my own, ...
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168 views

Does an IO port address belong to RAM?

I have been using Linux (Ubuntu). To communicate with IO devices, IO port addresses are used. For example, 0x378 is an address for a parallel port. Is an IO port address an actual RAM address? If ...
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1answer
37 views

In a single terminal window capture the command to start a.out 3 times each running as background job

On linux terminal window is there a way i can start a program like ./a.out 3 times each running as background jobs. I was told that IO redirection is helpful.
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1answer
62 views

How can I measure disk writes per file/program over a long period of time

I have an SSD and a hard disk in one computer. I use mountpoints and symlinks to put write-heavy directories (e.g. Downloads) on the hard disk to save on wear on the SSD. I want to find out which ...
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1answer
12 views

Linux redirect output ro earlier agument

Is there a way to redirect output on Linux to a former argument. For example, sort file.txt > file.txt Would there be a way to avoid typing file.txt again?
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430 views

Memory Mapped vs I/O Mapped Input Output

I'm currently reading a computer organization book and i'm so confused about Input/Output mechanism and have lots of questions in my mind. As i understood there are two concepts for communicating ...
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300 views

NFS writes to md-raid extremely slow with busy jbd2

As far as I can remember, this problem appeared after upgrade from Debian Squeeze to Wheezy. The symptom is extremely slow write performance on the server's dmraid exclusively if written via nfs ...
2
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1answer
850 views

ls -l but not ls --color=never slow on nfs-mounted directory, if simulatenously writing to that directory

when I dump data into an NFS-mounted directory, reading files modes (e.g. ls -l) is several orders of magnitude slower than a plain file listing (e.g. ls --color=never). I would like to understand ...
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46 views

Monitor disk I/O used by specific command

I know that there are various tools for monitoring disk I/O, but I am wondering specifically if there is something equivalent to time for disk usage? For example, I am benchmarking a specific command ...
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1answer
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Windows: Wide Variation in Read Performance

I'm new when it comes to measuring i/o performance. I found a tool called HDTune Pro, which according PCWorld is a good tool for i/o benchmarking. This tool attempted to read 40GB, on the first ...
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1answer
186 views

How can I debug IOZONE over the network?

I'm working on a mac and I have a vm running ubuntu server. I created a file vm_client.iozone that looks like: vm /path/to/test /usr/bin/iozone I have configured iozone to work over ssh using ...
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443 views

hard drive - How type of I/O access influences access time?

I am trying to better understand how the type of I/O access influences the access time. Can a conventional HDD perform both random and sequential access ? If so why would you want to keep provisions ...
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2answers
45 views

How is it possible for me to hear the audio of multiple different videos on my computer? [closed]

I am reading this book and so far, being in chapter 3, I understand that multiprogramming and multiprocessing allows for faster execution of multiple existing processes/threads. I am reading into all ...
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3answers
219 views

Find which process uses on average the most CPU, Memory and IO on Windows 7

I'd like a way to monitor processes on Windows 7 for average CPU, Memory and IO since last boot. I would love it if it was a nice UI friendly tool that could sort processes by Average CPU, Average ...