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. <div class="gmail_quote">On Jun 12, 2012 5:01 AM, "Chris Wilson" <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> On Mon, 11 Jun 2012 18:46:13 -0400, Patrick Wilbur <<a href="mailto:patrick.wilbur@gmail.com">patrick.wilbur@gmail.com</a>> 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 </blockquote></div>