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

learn more… | top users | synonyms

0
votes
1answer
35 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 ...
1
vote
0answers
35 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 ...
2
votes
1answer
118 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 ...
0
votes
0answers
5 views

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 ...
3
votes
3answers
57 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
votes
1answer
81 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 ...
0
votes
0answers
21 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 ...
0
votes
0answers
50 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 ...
0
votes
1answer
27 views

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 ...
1
vote
4answers
134 views

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 ...
0
votes
1answer
290 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 ...
0
votes
1answer
201 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 ...
1
vote
0answers
146 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 ...
0
votes
7answers
282 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 ...
3
votes
1answer
961 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 ...
-1
votes
4answers
264 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 ...
0
votes
1answer
85 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). ...
2
votes
0answers
51 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 ...
2
votes
1answer
172 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 ...
1
vote
1answer
88 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 ...
0
votes
0answers
132 views

iotop complains “CONFIG_TASK_DELAY_ACCT not enabled in kernal” 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 ...
0
votes
1answer
108 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 ...
0
votes
0answers
37 views

Identifying disk readr/writer (Debian Linux)

I have the strange activity on my Linode. The Munin reports shows that there is constant writing to /dev/xvda at the rate of 30Kb/s. The Linode Graphs shows constant DiskIO at 48 Blocks/sec average. ...
2
votes
2answers
895 views

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 ...
0
votes
1answer
265 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 ...
0
votes
0answers
56 views

How should I tune my VM based build machine for better performance

We've migrated our physical build machines to (Ubuntu 10.04 x86) VMs for the purposes of redundancy and ease of duplication. However I'm seeing very disappointing performance with the builds. Looking ...
13
votes
4answers
34k views

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, ...
0
votes
1answer
204 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 ...
0
votes
0answers
784 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 ...
0
votes
3answers
543 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 ...
1
vote
1answer
238 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 ...
1
vote
1answer
416 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 ...
0
votes
1answer
229 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 ...
0
votes
1answer
499 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 ...
1
vote
0answers
715 views

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. ...
0
votes
1answer
114 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 ...
3
votes
3answers
534 views

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 ...
5
votes
1answer
2k views

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: ...
1
vote
1answer
2k views

How to limit disk usage (Write/I/O) by application? (NOT space usage)

I'm really annoyed by not being able to do a few jobs at a time even if I have plenty of RAM and CPU left to utilise - so it's the disk usage, for example when I am extracting big archives using ...
3
votes
1answer
802 views

Is it bad if millions of files are stored in one NTFS folder?

I have a very large NTFS volume with more than 20TB capacity and containing millions of files. If I put all of the files in the same folder, I know the performance is bad when I open the folder in ...
1
vote
1answer
723 views

How to avoid I/O bottlenecks in PC hardware selection and analysis?

I'm aware that the data transfer rate and the amount of memory held in the CPU cache can determine how fast a PC works. There are also probably a bunch of other factors that affect the performance of ...
2
votes
3answers
511 views

linux: accessing thousands of files in hash of directories

I would like to know what is the most efficient way of concurrently accessing thousands of files of a similar size in a modern Linux cluster of computers. I am carrying an indexing operation in each ...
1
vote
1answer
254 views

Filtering serial port io

I am currently working on a project where I communicate with hardware via a com port on its respective pc(win xp or 7) It is a fairly large project and sifting through the log file can be a bit of ...
-2
votes
2answers
413 views

Hard drive write speed - finding a lighter antivirus? [closed]

I recently have been getting a lot of system lag here (for example, the mouse and the display in general take about 15 seconds to react in the worst cases). After a lot of monitoring the resources, I ...
1
vote
1answer
2k views

Cannot initialise HDD keep getting I/O Error…?

I'm in a very odd situation that I think the HDD is toast... but I need a second opinion because I've tried just about everything I know and it will not kick into life. that makes matters even worse. ...
0
votes
0answers
48 views

Dedicate IO priority to a process [duplicate]

Possible Duplicate: How to change I/O priority of a process or thread in Win7? On Windows (7 in this case) it's possible to dedicate CPU priority to a process to make it go faster. In most ...
0
votes
1answer
891 views

Large file copy from NFS to local disk performance drop

I'm trying to copy a 200GB file from an NFS mount to a local disk. The local disk is an XFS filesystem on a LVM on top of a RAID 5 system (hardware RAID controler). I'm using rsync to monitor the ...
2
votes
1answer
324 views

HD interface speed vs disk speed

I am looking at buying a new HD for a homegrown server and see that one of the candidates has a SATA interface with "3.0 GB/s" but it has a disk speed of 7200 RPMs. Obviously, the SATA speed is a ...
1
vote
1answer
3k views

How much slower is a RAID 1 hard drive compared to no RAID?

How much slower is RAID 1 than no RAID at all? I have heard that RAID 1 provides peace of mind (because of mirroring) but gives slower write (not read) performance.
0
votes
1answer
366 views

performance monitoring

I want to monitor CPU usage, disk read/write usage for a particular process, say ./myprocess. To monitor CPU top command seems to be a nice option and for read and write iotop seems to be a handy ...