[openstack-dev] Concerns about Gnocchi's performance

张灿 zhangcan at letv.com
Thu Jan 15 11:47:28 UTC 2015

> On Jan 15, 2015, at 18:46, Julien Danjou <julien at danjou.info> wrote:
> Yep, that's the main downside of the use of the Carbonara based backend
> in Gnocchi. But honestly, since it's download/upload are parallel and
> the file size is quite small, sending a metric should be pretty fast in
> most circumstances. Though that's sure it's gonna be faster with
> backends where you just have to send the actual metrics (OpenTSDB or
> InfluxDB likely).

As a further question, how do you estimate the storage impact of a vm instance’s metrics? I’m not very sure about the `back_window` and `definition` part, could you clarify that for me?

Can Zhang
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