Questions tagged [benchmark]
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141 questions
0 votes
2 answers
593 views
Is Debian 12 performance slower than older versions?
I recenly tried to upgrade a server from Debian 9 to latest version (12). After installing on a fresh server with the same hardware and without installing absolutely any packages, I faced with a lower ...
0 votes
0 answers
26 views
How to measure ram usage of a command [duplicate]
How to measure the memory usage of a running command in terminal? Does /usr/bin/time -v measure the RAM usage of a command?
- 1
0 votes
1 answer
366 views
How can I benchmark disk throughput using dd? (writing to /dev/null is instantaneous?)
I'm trying to perform a simple disk benchmark (throughput) of my ZFS filesystem using dd. Here is my command: dd if=/tank/media/video/largefile.mp4 of=/dev/null bs=1M count=1000 However, it finishes ...
- 373
0 votes
1 answer
110 views
Linux Fedora suddenly much slower... only on one computer
I have two computers running fully updated Fedora 40. The two computers have the exact same packages installed. They are not identical, but very similar and bought at the same time: Dell Optiplex 7000 ...
- 519
0 votes
1 answer
85 views
Stop system interrupts on app
I am using Linux on a microcontroller with 2 A72 cores, running my app on that, I am trying to measure runtime of a function in app using system call: clock_gettime(CLOCK_PROCESS_CPUTIME_ID , &tv);...
- 1
25 votes
2 answers
2k views
Why are my benchmark times not repeatable, even for a CPU-bound task?
I'm running some benchmarks on my Linux desktop/laptop computer, but I'm not getting reliable results. I'm running a CPU-intensive task that does negligible I/O and doesn't use much RAM. My computer ...
0 votes
0 answers
77 views
IOzone Filesystem Benchmark WEIRD Results on EXT4
I'm currently using an i7 with 32 GB of RAM to measure ext4 performance. However, I've encountered some unusual results when testing with 8 GB and 16 GB files. Shouldn't the performance increase ...
0 votes
2 answers
1k views
io_uring with `fio` fails on Rocky 9.3 w/kernel 5.14.0-362.18.1.el9_3.x86_64
I've tried various variations of the command: fio --name=test --ioengine=io_uring --iodepth=64 --rw=rw --bs=4k --direct=1 --size=2G --numjobs=24 --filename=/dev/sdc lower queue depth direct set to 1/0 ...
- 839
0 votes
1 answer
444 views
Benchmarking lustre filesystem
I want to benchmark the ability of a single lustre client to save in its lustre-mounted filesystem. I am an application developer and not a storage maintainer, so i am not worried about storage write ...
1 vote
1 answer
127 views
Why is the load of 'stress' unevenly distributed?
When I used stress to conduct stress testing on my system, I found that there was an issue with the distribution of CPU usage. CPU2 had a much higher usage rate than the other three CPUs. Excuse me, ...
- 67
0 votes
1 answer
249 views
Which tools for micro-benchmarking?
I'm not sure which tool to use for micro-benchmarking a C program. I would like to measure both: Memory usage, RSS ( Resident Set Size ) CPU cycles I did use perf record -g and perf script piped ...
0 votes
3 answers
113 views
Analogy of dd command real case when performing RW test
I'm doing these two tests: #1 dd if=/dev/zero of=./testfile1 bs=512M count=1 conv=fsync And #2 dd if=/dev/zero of=./testfile2 bs=1M count=512 conv=fsync Can I say: #1 is meaning copying (write ...
1 vote
2 answers
218 views
Is there a performance penalty for backgrounding a process?
If I do: sleep 1 versus sleep 1 & wait $! will there be any difference in terms of CPU usage for spawning a foreground process versus a background process? Or will the performance of both lines ...
- 233
0 votes
2 answers
190 views
How to figure out if CPU or GPU has been damaged by a thermal spike on Fedora
I have bought a new Asus Rog Strix laptop, and I ran on it Windows for a month without any issue. After I changed OS and putted Fedora 37 on it. My laptop has an NVidia 3060 with 6 GB (and a Ryzen 7 ...
- 203
0 votes
0 answers
850 views
understanding fio test results - 90th percentiles benchmark - Latency --> avg/stdev?
What are the relationships in storage benchmarking with fio between the average(avg) and standard deviation (stdev) at latency? Avg / stdev at latency is important for sequential or random test? Most ...
