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I'm trying to monitor disk activity time on macOS (similar to the "Disk Activity Time" percentage on Windows), but macOS's I/O statistics differ from those on Windows. Using the ioreg ...
Advice
1 vote
1 replies
43 views

I understand the standard explanation for why B-trees are used in databases: they minimize disk seeks by packing many keys into each node, keeping the tree shallow (3-4 levels), and enabling efficient ...
0 votes
1 answer
80 views

I’m exploring the Linux 0.11 source code, specifically how it reads data from the disk into memory. I’ve been analyzing the hd_out function and the associated do_hd_request in hd.c. Here’s the ...
0 votes
1 answer
147 views

I have an application that saves data to an xml file but when data cannot be interpreted it writes a message to a textfile. I am using Delphi 11, Windows 10, 64bit compilation The procedure to write ...
0 votes
0 answers
86 views

When I write to a disk device or a drive, sometimes I get an access denied error: HANDLE hd=CreateFile("\\\\.\\PhysicalDrive1",GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE, NULL,...
1 vote
1 answer
648 views

I'm encountering an issue where Node.js processes are consuming excessive disk I/O when I'm using Visual Studio Code (VSCode) with Remote SSH to develop Next.js applications on a cloud server. This ...
1 vote
0 answers
82 views

Greetings Stack Overflow community! I'm currently working on a Go script to fetch disk I/O operations using my API. However, I'm encountering a peculiar issue where the script returns empty values. In ...
kekw's user avatar
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0 answers
3k views

I have a server running standard Prometheus node exporter. Metrics are properly collected. Now I need to display in Grafana rate of time spend for IO operations on all devices. In the /metrics for my ...
1 vote
0 answers
523 views

Linux provides /proc/[pid]/io interface to get I/O stats of a process. But in addition to the accumulated I/O of live threads, read_bytes and write_bytes fields also include the I/O of dead threads ...
Irfan Latif's user avatar
0 votes
1 answer
292 views

I was trying to measure the system performance with sysbench fileio test. However, I'm not sure what am I playing with when I change that file-block-size parameter. Previously I thought it was the ...
-1 votes
1 answer
95 views

I am trying to write a bootloader by myself, but qemu-system-i386 CPU will reset probabilistically. But bochs does not have this problem. Why? my code is mbr.s and loader.s: # cat mbr.s %include "...
1 vote
1 answer
468 views

I need to read a sector from the physical disk, but without using the system cache. I tried this: import os disk_path = "/dev/sdc" try: disk_fd = os.open(disk_path, os.O_RDONLY | os....
1 vote
0 answers
129 views

The SQL databases generally use B-trees to store index (and sometimes data as well) in the disk. The B-tree is a tree of disk pages. To create B-tree, the DBMS would require access to pages on the ...
0 votes
1 answer
255 views

According to Kafka doc https://kafka.apache.org/documentation/#persistence, Kafka utilities squential read/write performace of spnning disks and hence have high throughput. But how can this high ...
1 vote
0 answers
2k views

My SysAdmin colleague told me that the Postgres'hosts use NVME disk. How can I check that with Linux command? Why does the planner/optimizer seem to get it wrong when I set random_page_cost =1.1 To ...

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