Raspberry Pi benchmarks
I had a bit of time today and decided to start using the Raspberry Pi I bought last year. I'm very interested in wringing performance out of it, so to the best of my ability I'm going to measure performance.
I had previously downloaded Arch Linux, so I put that on an SD card. Then I saw a blog post suggesting that a USB drive could increase the performance. So! I adapted the instructions and captured some benchmarks. Quick summary: the USB drive has a slower write speed but a faster read speed...but I have to acknowledge that the results might be better with a different USB drive.
The SD card (a 32GB Sandisk Ultra class 10 32GB card)
[root@alarmpi sdcard]# hdparm -tT /dev/mmcblk0 /dev/mmcblk0: Timing cached reads: 312 MB in 2.00 seconds = 155.98 MB/sec Timing buffered disk reads: 54 MB in 3.06 seconds = 17.65 MB/sec [root@alarmpi sdcard]# sync;time bash -c "(dd if=/dev/zero of=bf bs=8k count=50000; sync)" 50000+0 records in 50000+0 records out 409600000 bytes (410 MB) copied, 39.6374 s, 10.3 MB/s real 0m41.003s user 0m0.240s sys 0m10.230s [root@alarmpi sdcard]# dd if=bf of=/dev/null 800000+0 records in 800000+0 records out 409600000 bytes (410 MB) copied, 22.3598 s, 18.3 MB/s
The USB drive (a Lexar 8GB Jumpdrive)
[root@alarmpi ~]# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 308 MB in 2.00 seconds = 153.90 MB/sec Timing buffered disk reads: 58 MB in 3.04 seconds = 19.09 MB/sec [root@alarmpi ~]# sync;time bash -c "(dd if=/dev/zero of=bf bs=8k count=50000; sync)" 50000+0 records in 50000+0 records out 409600000 bytes (410 MB) copied, 41.1666 s, 9.9 MB/s real 0m45.185s user 0m0.250s sys 0m8.210s [root@alarmpi ~]# dd if=bf of=/dev/null 800000+0 records in 800000+0 records out 409600000 bytes (410 MB) copied, 20.5428 s, 19.9 MB/s
