[FoRK] Anyone know if EC2 takes a while to flex the CPU speed up
Gregory Alan Bolcer
greg at bolcer.org
Tue Jul 16 10:57:22 PDT 2013
My guess is it's a disk issue or i/o issue. Figure out what disk
reads/writes are happening and where they are. Configure a small raid-0
using a couple of mounted volumes and configure the software to use that
as it's temp/scratch.
On 7/16/2013 10:45 AM, Andy Armstrong wrote:
> 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.
greg at bolcer.org, http://bolcer.org, c: +1.714.928.5476
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