Questions tagged [io]

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

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How to get the random/sequential IO during a time period

I know how to monitor individual IO. Possible tools like blktrace biosnoop iostat... And some disscusions also mention some specific software to do this. Using a tool like blktrace can only get the 1) ...
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Slow file deletion on linux cluster (xfs)

I could not really find something, which explains a problem we observe from time to time on our cluster. I (semi) rare cases files take ages to be deleted. We can then often narrow it down to a few ...
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Do writes and reads contend with each other for an SSD? [closed]

I have a disk I/O intensive application where I am reading and writing a lot concurrently. For a spinning disk, it makes sense that there is contention because the pointer has to move around a lot but ...
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Are iodepth and iodepth_batch the same in fio?

Wanted to know the difference between iodepth parameter and iodepth_batch parameter in fio. Here is what is mentioned in fio read the docs : iodepth=int Number of I/O units to keep in flight against ...
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pipe-lining using wget or curl on linux

I would like to know how can I download a file from the internet using wget and/or curl by separating the file into even segments and downloading the file using 8 or 16 direct links, substantially ...
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Settings for com ports to speed device I/O data transfers

I used to be able to go to com port settings for device I/O on windows and change settings such as baud rate for computer between internal PC hardware. I'm looking for instructions to do the same ...
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Stop disk activity of a process without killing the process

Is there a technique or tool that can be used to stop a running process from writing to a drive, but not kill the process. If I have more level of control in that, like selecting which drives the ...
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Any way to tweak Windows' kernels or drives to handle I/O and reduce or eliminate hangs with failing drives?

I frequently work with failing hard drives for data recovery and various tasks. These tasks are usually short lived in nature, but important. The way Windows seems to handle any failing drive that's ...
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See exactly which files each program accesses

You can easily observe that a program is performing I/O disk operations using a process monitor. Is there an easy way to observe exactly what files are being read/written to by each process? Windows/...
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Disk writes in Mac OS Mojave (10.14.6)

Good day everyone! I am trying to dissect MacOS to remove functions I do not need such as Siri, Spotlight, Sidecar stuff, etc. Mainly, I follow https://gist.github.com/pwnsdx and similar resources all ...
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What kind of disk operation is not read or write?

When reading a performance chart like this, what does the Other IO/Sec mean? What kind of operation is not read or write? The info button only leads to a doc with this vague description: NFS Write – ...
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Alert when a partition is read/written

My hard disk sometimes makes unexpected noise, indicating activity. By eyeballing iotop I believe this process is responsible: mount.ntfs /dev/sda2 /storage -o rw,umask=007,gid=46 however the ...
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How can one see how much total reads and writes (in bytes) a given file has received cumulatively since Windows started?

I started Microsoft Windows a few hours ago. I would like to see how much total reads and writes (in bytes) a given file has received cumulatively since Windows started. Windows Results Monitor doesn'...
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Why is my Linux PC coming to a complete stop on high IO?

For about 6 months or so I've been having issues with IO on Manjaro: when the system is doing some IO intensive work it comes to a complete stop. Here are some symptoms I've seen happen: Program that ...
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How to prevent Windows 10 and/or my computer from going completely crippled while utilizing file copying over USB?

I have a monster PC running Windows 10. There are zero known hardware issues, and it's managed by me, a poweruser. There are no weird things slowing it down. It runs at expected speed normally. It is ...
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EMMC with unblanced block erase count

We developed some embedded Linux products which write data log 24h*7 to 8GB eMMC chips. When reading the block erase counts of every block inside the eMMC chips by sending the CMD56 command. We found ...
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Why does transferring files to a USB stick grind my computer to a halt?

I'm currently syncing a bunch of files to a USB stick. Regardless of what USB version it uses, and regardless of my motherboard's ability to transfer USB data, why does it cause my entire computer to ...
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Using the sound card of a DVD player with a surround sound system for my monitor [closed]

I've recently acquired a DVD player with a built-in 5+1 Surround sound system from a family member. I have been using streaming services quite awhile now so I really don't need a DVD player. However I ...
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How to redirect specific file I/O to another drive

I'm on Windows and i'm dealing with a badly written application that needs to store huge temporary files, but the temp directory is apparently hardcoded to %localappdata%\Temp and cannot be changed. ...
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PCI device: who assign I/O address range ? (Bios, Driver or Opeating System)

Who assign I/O memory adress range ? I'm a little confused, I don't know if this address range is assigned by Bios, Driver or Operating system. I have a problem with an address range of a device and ...
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HDD I/O fast at first but gradually decreases? [duplicate]

I was benchmarking my WD 500 GB HDD in Ubuntu Disks several times and saw that the read speeds started at 140 MB/s, but it consistently would gradually decrease by a few MB/s with seemingly no floor. ...
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unclear semantics of some fio options

I am doing some raw disk tests using fio. I found some behaviour are not clear when I specify --filename=/dev/device_name and --direct=1. Could please help me to explain it? (1) default ioengine is ...
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High percentage of IO in iotop

I have a problem with a very slow process (mongod), so I downloaded iotop to see how is my drive going. I can see a very high percentage in the IO< column, constantly about 70-99%. Can someone ...
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Writing keypresses to SSD & wear leveling

I am planning to write an application that tries to write as much to file as possible as to never lose any significant amount of data. It will write every key stroke including micro or even nano-...
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2 votes
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why keyboard input lags while using Zoom app

Every time I am using Zoom App or Google Meet, The keyboard input is delayed terribly (about 3s+) while typing in any kind of application. I tried to reinstall Zoom again, deactivate my antiVirus (...
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Find out which files a process is writing to

I have this very annoying problem with Firefox for months where its CPU usage jumps to over 24% after a while when idle. Any official troubleshooting has lead to no positive results (tried to reset, ...
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IO shield is causing my motherboard to not align with case standoffs

I have a very quick question regarding the IO shield in my PC build. I'm a complete beginner when it comes to this, so this might be a silly question. I've recently started building a computer but I'...
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Why does the RTX IO in the Nvidia GeForce RTX 30 Series use any CPU at all even though the information flow from the storage to the GPU?

I saw in the 2020-09-01 Official Launch Event for the NVIDIA GeForce RTX 30 Series that the RTX IO in the Nvidia GeForce RTX 30 Series allows the GPU to directly access the storage (SSD) without ...
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Blktrace missing I/O events

I'm using blktrace to capture the traffic that goes to my device and have been dealing with some painful issues. Wondering if you guys can confirm/correct my findings. Seems like blktrace is missing ...
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How do I set /sys/block/X/queue/scheduler on Ubuntu 18.04 with HWE on startup

I am running Ubuntu 18.04 (Bionic) with the HWE stack installed. This means I have the 5.3 Linux kernel running. In older versions of the kernel, apparently passing elevator=noop when GRUB starts the ...
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No input devices working after startup

It's a normal day. I start my PC and try to login and BAM. Both my keyboard and mouse are not working. The devices itself are working fine (I can see the lights and stuff) but Windows somehow doesnt ...
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rm -rf foo_dir takes a long time

I have a directory ./aggregated/ in which I have 7550 sub-dirs each containing 250 files. aggregated has 5.5GB in total. I've tried deleting aggregated via rm -rf aggregated and it is taking hours. ...
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Poor and strange disk performance with VirtualBox (macOS host, Windows 10 guest)

I have VirtualBox 6.1.4 running on macOS Mojave. I'm working with a Windows 10 guest and it seems I have some performance problems with disks. Testing with Aja System Test, on macOS I see numbers ...
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How is I/O encryption handled in modern systems? [closed]

First: I've struggled with the question on which stackexchange to post this question since it involves OS knowledge, hardware knowledge but probably also other CS fields. Suggestions for a better ...
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Problems accessing disk after IO tests

I am having problems when accessing my home folder, or generally anything that is on my HDD (I also have an SSD which seems to work fine) in my ubuntu (18.04.4) workstation. :/$ df -h Filesystem ...
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What's happening when I create a file in a "NTFS compressed" directory?

What's exactly happening? The files appear in the UI as compressed. Is it? If so, is it written twice (like, uncompressed version of the new files is stored, as a buffer, and compressed then (so ...
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How to determine the duration for which a file was accessed/modified a program?

I would like to measure the speed of encryption performed by a utility on a Windows 10 box. Since there are no other ways in the utility itself to do this, I would like to know if I can determine how ...
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Process ntoskrnl.exe CPU usage jumps from 1% to over 40% precisely when using I/O

the problem occurs with the following system. Device: Lenovo Ideapad 730S - Windows version: 10.0.18362 Build 18362 So ntoskrnl.exe is running just fine as long as all the USB-C ports are left free. ...
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how to install kernel module for blk_mq's io schedulers?

I have recently changed single queue to multi queue on my oracle server. This server is oracle linux 6.10 (4.1.12 kernel). I realize there is no any io scheduler for blk_mq alse show the /sys/block//...
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which io scheduler is recommended when use the blk_mq block layer with oracle database?

I have oracle Linux 6.10 with 4.1.12 kernel. I have recently moved from the legacy block to the blk_mq block. But all SCSI devices have show io scheduler is none. I have researched but I didn't find ...
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Cannot diagnose slow disk read speed, bottleneck, in Ubuntu

I have the same processes running on 2 (or more machines) for which we notice a massive slow down in disk i/o on some machines. The PCs have very similar hardware (I am happy to post dmidecode if ...
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Is it safe to use one server fd in multiple epoll event loops in different threads?

I have one server fd, and several threads with epoll event loop in each of them (different epoll_fd's). Is it safe, if I would add this fd to every event loop? Is it true, that only one of them would ...
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Pipe stdout of two programs to each other

I have two programs, one of them prints something first, they need to communicate with each other with their standard IO. Is there a way in Bash to pipe stdout of two programs to each other? I know I ...
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2 votes
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Making MsMpEng.exe disk access be nice

MsMpEng.exe disk accesses are making my system unusable. Since this process is critical for system security, it is unreasonable to disable it. Moreover, as it is provided by the OS vendor, and ...
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Very high disk usage due to reading from CbsPersist...log

My personal laptop is Windows 7, Dell, 8 CPU Cores and 8GB of RAM. It operates very slowly, especially when launching software, and I think especially when starting up (but not only). Looking at ...
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Trying to write to /sys/class/gpio/export – write error: Invalid argument

I have an Intel aaeon upboard and I want to use its GPIO pins. To do that I'm trying the below code: echo 17 > /sys/class/gpio/export But when I run it, this is what I get: -bash: echo: write ...
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3 votes
1 answer
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Where do Docker containers and Kubernetes pods write to disk in absence of a volume?

General question about the internals of Docker and containers running in Kubernetes when using the Docker engine. Docker containers are ephemeral, meaning that if a container is destroyed, any data ...
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Unable to mount DVD - unable to read superblock

I bought a Documentary DVD online, but when I inserted the DVD into a Windows machine, nothing happened. So, I tried with Ubuntu, and same thing happened. When I checked dmesg after I inserted the ...
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Does 'Write cliff' phenomenon only happen to SSD disks?

First of all, I am new to disks, I just know the basics. I am trying to improve performance of a software with heavy I/O and I need to understand how my SAS disks work in terms of read and write speed....
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CPU Burst or I/O Burst

If a process that currently is being executed faces an I/O Burst, will the next available process gain the CPU burst or will the processor wait until the I/O Burst of the first process finishes to ...
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