[Ronald Anzenberger]

i am having similar issues. it seems to boil down to the fact, that writing the disk cache is really slow. i’m investigating this problem, as it seems to make the diskcache useless. are you using ssd drives for your diskcache – because i am not and this might make a difference too (but not that much).

[Ronald Anzenberger]

so you are telling me that you have the same behaviour when using a normal hdd and when using an ssd it works as it should?

sure it makes sense even if the writing of the files takes long, but i also do client-sessions which actually worked great with earlier versions of ae, but this would be a killerfeature, if the caching would happend right away.

in demo videos i have seen, it seem to work that way.

[Ronald Anzenberger]

except for the fact that it is not an ssd, all your other points apply to my drive. and again, i am testing this on single cache files in a very controlled setup. it just has to write a single 8 MB files, and it takes around 3-4 seconds for that!

meanwhile i was able to do a test on a second machine which has a raid0 with two drives, and this performs much better but still not as one would expect. i’d expect a ram-preview to go straight to disc – but it won’t.

i did a quick atto benchmark on this machine and it tells me the drive(s) have a write performance of 200 MB/s wih files around 2 MB and still around 9MB/s with files around 0.5 kb which i think is the reason this system performs better.

only thing i could imagine is that ae is writing the files in super small blocks which might explain the weak performance.

i can’t do a test on the other system rit now, but i will keep you posted.

has anybody else tried to use this feature?

[Ronald Anzenberger]

hi walter,

rendering is not included.

what i did:

create a new project with a single comp and a single layer in it. the layer is a raytraced 3d thingy and renders around 2 seconds a frame.

i deleted all diskcaches and moved to a new frame. when rendering of the frame is done, the preview cache indicator jumps to green and the the harddisk light starts to flash and one can also hear that the hdd is working. after around 3-4 seconds this stops – cache frame written.

there is no other i/o on the drive.

once the cache is rendered, i purge all ram caches. timeline turns blue and i can pretty much scrub through it in realtime refilling the ram-preview (just as you would expect).

the problem is especially visible with with comps that render rather fast. a comp that has around 200 frames and renders around 20 seconds take several minutes to cache (when using ctrl + return) in

i have an anti virus software running which might be the problem ( allthough i deactivated it). i will try uninstalling it all together just to rule it out.