I use this often in the vm-land to test VMFS stores/LUN performance of new VMs I setup and I also use a few other benchmark tools to monitor how performance is impacted over the course of time.
root@nitrous:~# hdparm -Tt /dev/sda /dev/sda: Timing cached reads: 12420 MB in 2.00 seconds = 6217.17 MB/sec Timing buffered disk reads: 584 MB in 3.00 seconds = 194.43 MB/sec
The -T option: The speed of reading through the buffer cache to the disk without any prior caching of data.
The -t option: The speed of reading directly from the Linux buffer cache without disk access.
That measured sequential access, now lets look at random seeks.
Seeker (http://www.linuxinsight.com/how_fast_is_your_disk.html)
Local download: https://techish.net/wp-content/uploads/2022/06/seeker.c
This is with defaults
root@nitrous:~# gcc -O2 seeker.c -o seeker root@nitrous:~# ./seeker /dev/sda Seeker v2.0, 2007-01-15, http://www.linuxinsight.com/how_fast_is_your_disk.html Benchmarking /dev/sda [51200MB], wait 30 seconds............................. Results: 278 seeks/second, 3.58 ms random access time
SeekMark (http://learnitwithme.com/?page_id=267)
Local download: https://techish.net/wp-content/uploads/2022/06/seekmark-0.3.c
This is with defaults (Single thread, 0-5000 random seeks on /dev/sda, 512 bytes)
root@nitrous:~# ./seekmark -f/dev/sda READ benchmarking against /dev/sda 51200 MB threads to spawn: 1 seeks per thread: 5000 io size in bytes: 512 Spawning worker 0 to do 5000 seeks thread 0 completed, time: 15.92, 314.09 seeks/sec, 3.2ms per request total time: 15.92, time per READ request(ms): 3.184 314.09 total seeks per sec, 314.09 READ seeks per sec per thread
This is with 10 threads, 0-5000 random seeks on /dev/sda
root@nitrous:~# gcc -o seekmark -lpthread seekmark-0.9.c root@nitrous:~# ./seekmark -f/dev/sda -t10 READ benchmarking against /dev/sda 51200 MB threads to spawn: 10 seeks per thread: 5000 io size in bytes: 512 Spawning worker 0 to do 5000 seeks Spawning worker 1 to do 5000 seeks Spawning worker 2 to do 5000 seeks Spawning worker 3 to do 5000 seeks Spawning worker 4 to do 5000 seeks Spawning worker 5 to do 5000 seeks Spawning worker 6 to do 5000 seeks Spawning worker 7 to do 5000 seeks Spawning worker 8 to do 5000 seeks Spawning worker 9 to do 5000 seeks thread 4 completed, time: 142.17, 35.17 seeks/sec, 28.4ms per request thread 7 completed, time: 144.52, 34.60 seeks/sec, 28.9ms per request thread 2 completed, time: 152.03, 32.89 seeks/sec, 30.4ms per request thread 9 completed, time: 152.75, 32.73 seeks/sec, 30.5ms per request thread 8 completed, time: 152.88, 32.70 seeks/sec, 30.6ms per request thread 5 completed, time: 153.19, 32.64 seeks/sec, 30.6ms per request thread 3 completed, time: 153.47, 32.58 seeks/sec, 30.7ms per request thread 6 completed, time: 155.04, 32.25 seeks/sec, 31.0ms per request thread 1 completed, time: 155.79, 32.10 seeks/sec, 31.2ms per request thread 0 completed, time: 156.64, 31.92 seeks/sec, 31.3ms per request total time: 156.64, time per READ request(ms): 3.133 319.21 total seeks per sec, 31.92 READ seeks per sec per thread
