[FoRK] Anyone know if EC2 takes a while to flex the CPU speed up

Andy Armstrong andy at hexten.net
Tue Jul 16 10:45:11 PDT 2013

On 16 Jul 2013, at 18:29, Gregory Alan Bolcer <greg at bolcer.org> wrote:
> Run this on both systems.
> dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync

It's slow - 37.3 MB/s compared with 127 MB/s on another spinning disk machine and 232 MB/s on an SSD box.

> Also, I'm guessing it's allocating memory that the VM doesn't have immediately accessible so that the cpu gets way ahead of the memory.

It's not using much memory at all - and doesn't seem to use much more - if any - when you increase the complexity of the input video.

Andy Armstrong, Hexten

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