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Update on render-time issue
Jan. 15th, 2013 10:55 pmAs a follow-up to the previously-mentioned issue with the 64-bit version of Blender and Ubuntu Linux taking longer to render than the prior 32-bit versions did, I ran another test today.
This time, I made sure no other foreground applications were running, made sure the screensaver was set to blank-only, with fading disabled, and waited long enough for the usual boot-time systems to settle down before launching Blender and rendering the scene in question.
From a render time of around 42 minutes on the old 32-bit system, today I got a render time of 64 minutes, which is only about a 50% drop in render speed.
Still, it's rather disappointing that it's a drop and not an increase, and the amount is somewhat alarmingly high.
One thing I noticed is that something was hogging the CPU at random intervals during the rendering process.
I'd be moving the mouse cursor around in a circle, watching to see what would happen, and it would stop for about half a second at random intervals somewhere between one second and ten seconds apart.
I'm going to try installing the official nVidia shader compilers and see if Blender uses them to see if there's an issue with the bundled compilers.
So far, they haven't fixed the random CPU-hogging...
With further testing completed with the new compilers installed, nothing appears to have changed.
Same rendering time, same CPU-hogging intervals, same results (which is always important), so I'm not quite sure what's up yet.
I haven't checked the system logs just yet, so there might be information left that I haven't found.
This time, I made sure no other foreground applications were running, made sure the screensaver was set to blank-only, with fading disabled, and waited long enough for the usual boot-time systems to settle down before launching Blender and rendering the scene in question.
From a render time of around 42 minutes on the old 32-bit system, today I got a render time of 64 minutes, which is only about a 50% drop in render speed.
Still, it's rather disappointing that it's a drop and not an increase, and the amount is somewhat alarmingly high.
One thing I noticed is that something was hogging the CPU at random intervals during the rendering process.
I'd be moving the mouse cursor around in a circle, watching to see what would happen, and it would stop for about half a second at random intervals somewhere between one second and ten seconds apart.
I'm going to try installing the official nVidia shader compilers and see if Blender uses them to see if there's an issue with the bundled compilers.
So far, they haven't fixed the random CPU-hogging...
With further testing completed with the new compilers installed, nothing appears to have changed.
Same rendering time, same CPU-hogging intervals, same results (which is always important), so I'm not quite sure what's up yet.
I haven't checked the system logs just yet, so there might be information left that I haven't found.
