IOzone benchmark on EC2

I have run off another IO benchmark on EC2 using IOZone.

The OS is Centos 4.4 OS, running on Amazon Machine Image (AMI), which is a Zen based Virtual Machine (VM).

There seem to be a couple of sweet spots identified by the benchmark.

1. To stay in CPU Cache keep your file size smaller than under 256KB and read and write in 64 Byte chunks
2. If you must read from larger files, the size of the cache is the maximum size to remain in memory
3. Reading is best done between 64 Byte to 512 Byte chunks.
4. At least on EC2 stay away from reading 16 Kbyte files in 128 byte, 1K and 8K chunks.
   

The results and larger graphs can be found here

http://s3.amazonaws.com/dbadojo_benchmark/iozone_ec2_write.GIF
http://s3.amazonaws.com/dbadojo_benchmark/iozone_ec2_read.GIF
http://s3.amazonaws.com/dbadojo_benchmark/iozone_ec2_random_read.GIF
http://s3.amazonaws.com/dbadojo_benchmark/iozone_ec2_random_write.GIF
http://s3.amazonaws.com/dbadojo_benchmark/iozone_benchmark_ec2.zip (Right Click SAVE AS)

Have Fun

Paul