Hi,
Is there any known serious performance issue with GEM on Ubuntu 64bit? Or is there some known problem with this OS on intel macs?
A friend of mine has just installed Ubuntu 10.04 amd64 on her Macbook pro which has an intel core duo 2.4GHz processor.
She has tried a patch which plays 4 videos at the same time and she experience much worse performance than I do with the same patch and same videos on my intel core duo 2.1 GHz pc.
The only differences appear to be the hardware and the fact she is using 64bit ubuntu while mine is 32bit.....
I'm not sure if the macbook may have a slower hard disk or a less powerful gpu, but the difference in performance is about a factor 2, it's huge.....
I know this is very little information but does this remember you of some known issue?
thanks m.
On Sun, 3 Oct 2010, Matteo Sisti Sette wrote:
She has tried a patch which plays 4 videos at the same time and she experience much worse performance than I do with the same patch and same videos on my intel core duo 2.1 GHz pc. I'm not sure if the macbook may have a slower hard disk or a less powerful gpu, but the difference in performance is about a factor 2, it's huge.....
Try it with four videos short enough so that the hard disk is not getting accessed after they have looped. Then measure performance while the hard disk is not being accessed. This will give you figures independent of hard-disk speed.
It's not just the speed of the hard-disk and GPU, it's also the speed of the connector between the CPU and the GPU, and the connector between the CPU and the hard disk.
Also the speed of the hard disk differs depending on whether your data is fragmented. If you have four "defragmented" files you are trying to read continuously little bit by little bit, you're actually doing a very fragmented reading. What happens if you glue together the four videos as one big video ? does the hard disk work less ?
| Mathieu Bouchard ------------------------------ Villeray, Montréal, QC
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Mathieu Bouchard -
Matteo Sisti Sette