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Questions tagged [io]

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

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1answer
23 views

iostat + how to solve latency on disks

we use iostat -x and check for the await column - per device it shows the total time spent waiting plus the actual handling of the request by the disk iostat -yzx 5 Device: rrqm/s wrqm/s ...
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1answer
19 views

Can Operating Systems handle shift, ctrl and alt key signals separate from the keyboard?

The basic problem is this: I have a mini keyboard I'm using for a Raspberry Pi project, and since there is only one shift, ctrl and alt key apiece, that means combinations on the left side of the ...
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1answer
20 views

Disk write issue but no error detected

I'm using a 3TB western digital red disk on my desktop pc (windows 10) and smart info says it's been powered on for nearly 1000 days, I never had any issue with it before but now I'm having some ...
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0answers
40 views

Why firefox behaves so weirdly/annoying?

Occasionally FF starts very heavy activities, performing huge amounts of I/O (On my HDD) and considerable CPU usage for a long time (More than 10 minutes is really normal for it) that there is no ...
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1answer
50 views

Which filesystems reuse unchanged data blocks on write?

Let's say I open and read an existing file of N blocks where N > 1. Then I change data which resides within the boundaries of one - 1 - block. On writing back the actual data, presumably one of ...
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2answers
40 views

What are the relations between IO ports and registers in a device controller? [closed]

Do the following two references give different claims on the relations between IO ports and registers in a device controller? What are their relations actually? Does the following quote from https://...
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2answers
46 views

Are interrupts used to signify that output is ready or input has completed? [closed]

Operating System Concepts says: During I/O, the various device controllers raise interrupts when they are ready for service. These interrupts signify that output has completed, or ...
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0answers
14 views

Mouting error bash on ubutun on Windows

I was running md5sum on a usb hard-drive via bash on Windows, but I had to terminated the program because of some errors. I tried to remount the drive and gives no error , but I was unable to cd ( ...
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1answer
89 views

Poor concurrent IO performance, how to trade latency for throughput?

I have a fairly IO-heavy GPU-limited process that needs to read in random files from a folder in a local hard drive. When the process is running by itself, I get a consistent throughput of around 30 ...
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0answers
278 views

Does porttalk work in Windows 10?

Porttalk is a driver that enables applications to access hardware's I/Os directly, like it was possible in Windows 98. Porttalk consists basically of two files: porttalk.sys: The actual driver ...
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0answers
30 views

Io fall very low when using network

Hello I use manjaro linux from some mounth. My computer work really well but when i am downloading something it start to be really slow even when i have an ssd and fiber. Yesteday I tried to download ...
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1answer
102 views

Is it possible to calculate theoretical i/o throughput of CPU?

I have machine with i7-2600K and I'm turning it into storage server. It's using P67 chipset which uses 20 Gb/s DMI interface to CPU. There are also pcie x8/x8 slots on board wired directly to CPU. I ...
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1answer
91 views

mounted local network synology folder : Input/Output error when tryign to write inside files

/etc/fstab mounts local network synology folder in Ubuntu 14.04 LTS like this: //<numeric synology ip>/<synology_folder_name> /home/<user>/<mount_folder> cifs credentials=/...
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1answer
84 views

PORT-MAPPED I/O (Parallel Port)

I was reading into linux device drivers and reading and writing from parallel ports. I read something to the effect of ioperm(from, num, turn_on) , where: from is the first port number to give ...
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0answers
912 views

VirtualBox performance better with host i/o cache off

I was just building a vagrant environment with the box debian/stretch64. This is a test bed for ruby chef, so first thing my provisioner does is this: apt-get install -y curl curl -L https://...
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1k views

How to repair a micro SD card with I/O errors?

I have an 32 GB micro SD card which was able to let me copy data, but not alter data. After a lot of research, I came to the conclusion that the 'card detects a potential fault within itself. The ...
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0answers
29 views

How can I monitor data speeds on a Thunderbolt 3 port?

I am using a Thunderbolt 3 hub with two 4k monitors, Time Capsule, USB, and speakers, connected to it from my my MacBook Pro. This is all done with a single Thunderbolt 3 cable. Is it possible to ...
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0answers
39 views

Find exactly what PHP files are responsible for each PHP process

I have a WordPress website hosted on a shared Red Hat 4.4.7-18 Linux box, and from time to time I get huge memory and I/O spikes exceeding my allowed memory limit, making my website unresponsive. I ...
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1answer
1k views

How does Raid 0 improve read performance?

Let's suppose we have 2 hard disks and stripe unit size is 64 kb. While doing random read with size 4KB how Raid 0 affects performance? I mean if we are doing random reads wouldn't operating system ...
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2answers
88 views

What is a computation period? [closed]

In my textbook Operating Systems: Internals and Design Principles (Seventh Edition) by William Stallings I am confused by what the first problem (#2.1) on page 104 means by "period". Here is the ...
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0answers
41 views

Partclone taking 50 hours to back up 1 TB

I’m using Partclone 0.2.66 downloaded from the UBCD. I have a 3 TB hard drive split into three separate partitions of 1 TB each. It seems that there was a bunch of SMART errors on that drive, so I ...
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1answer
2k views

Synology Hyper Backup to external USB drive: Exception occurred while backing up data (Disk I/O error)

I am attempting to backup my entire Synology1 DS415+ NAS volume to an external Western Digital My Book 8 TB USB drive, using Hyper Backup. The backup worked fine for about 10 hours, but suddenly ...
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0answers
48 views

How to redirect file I/O operations of a process to memory or a different file?

Let's say I have a file named file.txt and a running process with PID 12345 which sometimes reads and sometimes writes to that file. Is there any way I can fool the process with PID 12345 to read or ...
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0answers
46 views

After moving to Win 10, Task Manager + Perfmon showing 0 byte/s and total HDD I/O when they should show > 100MB/s. Where have the stats gone?

In Windows 8.1 for years, I've been able to see the cumulative and per-second bytes R/W from disk migration in Task Manager, Resource Monitor, and Perfmon indicators. I'm trialling vanilla new ...
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1answer
100 views

How do use Ubuntu/Windows to capture video from input?

My Panasonic DMR EZ48 VHS/DVD player has an HDMI output. I want to copy VHS to digital files on my laptop. I have a USB to HDMI converter. How do I use my laptop to capture video from the VCR? I am ...
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1answer
2k views

Can't Clear/Format HDD or Partitions (Windows 10 Installation)

So, here's what happened. I plugged in a bootable W10 installation thumbdrive. After deleting two preexisting partitions that I had made manually, the installer created a reserved system partition (...
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0answers
378 views

VirtualBox - high performance I/O tuning - is it possible?

I'm running workstation that heavily relies on virtualization. I chose VirtualBox because: unlike VMWare it's free and much more portable and maintenance-free (no need to troubleshoot issues with ...
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0answers
199 views

How can I measure disk I/O waiting time for an active CPU?

There are already many tools to measure the % of the CPU waiting time during I/O operations, like dstat. Nevertheless, I am looking for a way to measure the waiting time % of the active cores. In ...
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0answers
255 views

How are PCI(e) errors propagated to userspace in case of errors?

PCIe supports various error reporting mechanisms, and I can see how a device driver would interface with these capabilities to handle specific error types and reinitialize the device in question as ...
1
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1answer
283 views

Where to put XAMPP HTDOCS Confusion

Is it okay to put the XAMPP Directory in your SSD? ...considering such cases like you're a web developer and performing small writes to the files under its HTDOCS directory when you make changes / ...
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2answers
143 views

Laptop hard drive loses power after connecting all USB ports

[Win 10] Recently my MSI GS60 Ghost Pro-002's secondary Hard Drive has been losing power (I think?) seemingly randomly. However, I am 90% sure it is not an issue with the hard drive, because the only ...
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4answers
135 views

How do you manually recover a failed internal HDD? [duplicate]

See bottom of question for edits elaborating on original question A SATA hard drive suffered mechanical failure (a little while after percussive shock) and OSX declared it unreadable despite ...
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0answers
265 views

Debugging IO saturation on linux

I have the following problem. On one machine, device IO is saturated to 100% util (via iostat -x 1) during one program execution. While on other less powerful CPU/GPU wise there's no such problem, ...
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2answers
675 views

Cloning disk without loss of information on IO errors

I want to test a partition creation software like parted. I found an old USB stick which crashes the program whenever I try to read it. In order to preserve this test case I need to copy the USB ...
11
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2answers
26k views

Task Manager shows 100% disk usage at just 0.5Mbps

My PC shows 100% disk usage though Task Manager lists down only 0.4Mbps as the total usage and the PC freezes. At other times, I can see disk I/O going upto 7 Mbps, but PC does not freeze. I have ...
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1answer
73 views

pata hard disk I/O error in 2 sectors

after deleting all partitions and creating one fat32 partition, I got this error in the terminal and then I ran GSmartControl and got a report. and also the chkdsk gave me an error An error occurred ...
3
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1answer
107 views

Unknown i/o port symbol on 15-pin D connector

I've never seen this symbol before, and can't seem to find it on the web. The symbol appears to be an exclamation mark partly intersecting a horizontal (h axis longer than v axis) lozenge. I say "...
3
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1answer
3k views

ZFS vs raw disk for storing virtual machines: trade-offs

Background: I am planning to set up a KVM to run Windows and Linux on the same workstation, and am undecided about how to set up the disks. It is my understanding that raw disks typically improve ...
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0answers
42 views

Old, rarely accessed folder loads very slow (HDD)

I have this backup folder I created ages ago and when the time comes for my yearly windows reinstall I usually put some of my documents and semi-important files (like save games, configs) in that ...
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1answer
54 views

What limits writing to 2 SSD drives at the same time

I'm trying to understand about IO and CPU cores and have gotten myself confused. Does writing to 2 SSD drives depend on the number of cores? In my mind, if it's a single core process then the ...
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2answers
585 views

Does a x86 computer use the pci bus and pci protocols to access memory?

After viewing lspci -k: 00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller (rev 06) Subsystem: CLEVO/KAPOK Computer Device 5455 00:02.0 VGA compatible ...
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1answer
24 views

Do random accesses wear hard disks?

For classical, old-style, non solid state hard disks (HDD), I know that random accesses are much slower than sequential accesses since the physical tip needs to jump from one point of the disk to ...
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0answers
274 views

Flash drive works in read only, not on read/write [duplicate]

I have a 32GB Imation flash drive with a physical read-only switch. A while ago I used it to install Ubuntu, and to do so I created a bootable USB. It worked, I installed Ubuntu, everything worked ...
4
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1answer
419 views

Windows: Determining which output stream # (1-9) console output is coming from?

I've seen questions in the past about "highlighting" different output streams between STDOUT and STDERR, but I was wondering if there was maybe a simpler way to do this on Windows. The reason I ...
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3answers
10k views

Are there any Pros/Cons to the /j Robocopy option (unbuffered copying)

Robocopy has a /J command line option recommended for copying large files (it copies using unbuffered I/O). What (if any) downsides are there? Any reason this isn't enabled by default? (That's what ...
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1answer
541 views

Set disk I/O priorities in Win7 or only allow disk access to specific processes (via batch file)?

The former would be more elegant but the latter is also fine for my purposes (and probably the more errorproof solution). I capture 720p50-HDTV losslessly (ULH0/ULH2) and my archive-drive is fast ...
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1answer
734 views

What does “% IO” mean in iotop?

I'm currently reading data from RAID and single hdd and monitoring speed with iotop. Numbers go like this: RAID: 380MB/s 23% IO HDD: 80MB/s 76% IO How to interpret IO %?
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0answers
41 views

Accumulate I/O for windows?

I have read about perfmon in Tracking disk I/O by application in Windows? However, I am looking for something that doesn't show the current byte/s rates, but the total amount as if you were running ...
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0answers
30 views

Follow up, extreme sluggishness on machine doing IO

This is a follow up to a previous question. After more investigation it appears that I have a slightly different problem, whenever I do any volume of disk based activity like copying files or backing ...
3
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1answer
395 views

top equivalent to show I/O per process (per second) on mac/osx

Is there a top-like (visual) tool which can show per process disk I/O (kb/sec)? The question was already asked at Monitor disk activity, á la top, or nettop (per process) on a Mac? and What'...