[cairo] Cairo performance testing with X11 forwarding

[Patrick Wilbur]

First, thank you very much for your reply.

Hmm. I am using ssh -X to access a KVM virtual machine from the host
system. Could Ubuntu 11.10 Desktop (my host system) have a different
library version than Ubuntu 12.04 Server (my VM)? My VM also doesn't have X
installed, but it has various libraries installed due to installing several
GUI apps--if lacking a library, would that affect anything and would the
benchmarks fail silently?

I will try running the experiments with both the host and VM running Ubuntu
12.04.
On Jun 12, 2012 5:01 AM, "Chris Wilson" <chris at chris-wilson.co.uk> wrote:

> On Mon, 11 Jun 2012 18:46:13 -0400, Patrick Wilbur <
> patrick.wilbur at gmail.com> wrote:
> > Hey all,
> >
> > I'm new to cairo-perf-trace. I'm trying to benchmark ssh -X forwarding
> > versus a local X server using the traces in the benchmark/ directory
> (from
> > the traces repository).
> >
> > Over ssh -X, cairo-perf-trace chromium-tabs.trace seemed to work and
> > terminate fine. The evolution.trace seems to hang (gave it an hour to
> > complete, but it didn't finish). The firefox traces also seem to hang.
> I'm
> > running on Ubuntu 12.04.
> >
> > Any reasons you can think of that this is happening? (Also, any reasons
> why
> > this isn't a good benchmark and, if so, what would be the best way to
> > accomplish what I'm trying to test?)
>
> For the stated purpose of looking at the overhead incurred through SSH X
> forwarding, it is fine. Rendering is almost entirely one-way traffic
> with very little round-trips so what you are mostly measuring is the effect
> of compression upon throughput, and given enough cores shouldn't see a
> large difference than rendering natively on the xserver.
>
> That it explodes timewise is indicative of a bug on your systems,
> somewhere between cairo and the remote driver.
> -Chris
>
> --
> Chris Wilson, Intel Open Source Technology Centre
>
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