IO performance benchmark on RamNode
Last update: 2015-01-18
I read a IO performance benchmark today comparing AWS vs DigitalOcean. It makes me curious about the IO performance on RamNode. Of course I wouldn’t expect something high since I’m running in one of the lowest tier offerred by them (It’s not even 100% SSD but just some kind of hybrid SSD-Cached). I will also ignore read test since all the VPS are container-based and read is probably heavily-cached anyway. As for the tool, I’m using
fio for my IO benchmark.
sudo apt-get install fio mkdir data # at ~ I suppose nano testconfig.fio # content of the file [random] rw=randread size=4g directory=/home/username/data iodepth=403 direct=1 blocksize=8k numjobs=10 # check size and your free space left (df -h) nrfiles=1 group_reporting ioengine=sync loops=1
Run status group 0 (all jobs): READ: io=2048.0MB, aggrb=6485KB/s, minb=6485KB/s, maxb=6485KB/s, mint=323357msec, maxt=323357msec
bw peaks at
Run status group 0 (all jobs): READ: io=1024.0MB, aggrb=8154KB/s, minb=8154KB/s, maxb=8154KB/s, mint=128592msec, maxt=128592msec
One thing to notice is the CPU load skyrocketted. Though I only went with
size=1g, the CPU load hits 3.x (300%). This is expected behavior since I’m on their Massive VPS plan. Due to this CPU issue, this is probably not the highest write speed possible as well. I would have to try it on a higher plan where CPU is irrelevant to the test. Too bad, RamNode doesn’t allow me to quickly launch an instance to test and destroy after.
So overall, DigitalOcean > AWS > RamNode. RamNode is left behind by far margin, probably due to the CPU on their lowest plan. If your application is IO-heavy, you should probably look else where.