Are there different amounts of RAM on the SSD machines vs the Spinny disk machines?
Sent from my mobile phone On Jan 17, 2014 5:22 AM, "Jay" <hja...@gmail.com> wrote: > OS memory cache?? > > Sent from my iPad. > > > 在 2014年1月16日，上午6:04，Chen Jin <karen...@gmail.com> 写道： > > > > Dear Spark developers: > > > > We are benchmarking spark operations such as filter, group, join on > > ssd instance i2.2xlarge on EC2. Most operations are similar or > > slightly better than ephemeral disks on EC2, however, the performance > > of group operation on SDD are much worse than regular disks, at least > > 2x to 3x worse. Could any of you shed some lights on this behavior? > > > > Thanks a lot, > > > > -chen >
