All Questions
Tagged with io filesystems
10
questions
1
vote
0
answers
42
views
btt in blktrace tool does not report any data in android
I have collected trace data in file parse.bin with blktrace in android.
Then I use btt to parse the cellocted data as below:
/ssd/blktrace/btt/btt -i parse.bin
But it does not report any data. The ...
- 11
0
votes
1
answer
185
views
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 ...
- 2,228
0
votes
0
answers
157
views
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.
...
- 223
1
vote
1
answer
125
views
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-...
- 1,878
-1
votes
1
answer
200
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 ...
- 109
3
votes
0
answers
237
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 ...
- 51
0
votes
1
answer
70
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 ...
- 2,607
1
vote
1
answer
674
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 ...
- 11
4
votes
3
answers
2k
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 ...
- 4,457
11
votes
2
answers
5k
views
When a disk read or disk write occurs, where does the data go?
I understand that there is such a thing as a disk controller which contains a buffer, but was wondering if the CPU reads directly from this buffer, or whether the data must first go to a specific ...
- 759