OS memory cache?? Sent from my iPad.
> 在 2014年1月16日，上午6:04，Chen Jin <[email protected]> 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
