Prefetching time window?

[Gbyrd]

Just curious about what prefetching time window is. So far the application has been working beautifully after a few growing pains. My prefetch settings were 1 MB to 400 MB prefetch and 60s time window. I am curious what the time window is for? I understand prefetch where if you are downloading 1 MB it decides to grab 400 for you. What does the time window represent?

 

Watching videos through plex it will pause for a couple of seconds as it is prefetching the next batch of 400 MB and it continues that way, sometimes plex says it cannot play it other times it resumes it. Just trying to figure out the best settings for it.

[steffenmand]

The time window is how long the data will be saved on the drive. So for instance in plex this could be nice if you want to pause or rewind - else it would have to prefetch again.

 

I use 20 MB chunks and have a 20 minimal download

 

20 download threads and 400 MB prefetch.

 

My time window is set to 1000

[Gbyrd]

The time window is how long the data will be saved on the drive. So for instance in plex this could be nice if you want to pause or rewind - else it would have to prefetch again.

 

I use 20 MB chunks and have a 20 minimal download

 

20 download threads and 400 MB prefetch.

 

My time window is set to 1000

 

Thanks i always thought anything that was prefetched ends up being cached, but clearly that isn't the case.

[steffenmand]

Thanks i always thought anything that was prefetched ends up being cached, but clearly that isn't the case.

 

Your cache will save it also, but you dont have unlimited space locally so the cache tries to save what is used most regularly. I dont have cache on myself, as i tend to access different stuff all the time caching gives me no effect but using extra space

[Gbyrd]

my cache is about 300 GB, i plan to expand it more, as i put things back there. But so far it's been pretty awesome

[Christopher (Drashna)]

Thanks i always thought anything that was prefetched ends up being cached, but clearly that isn't the case.

 

 

Yes and no.  If you have plenty of space, then yeah, it may end up cached.  

 

But this ensures that the data doesn't get dumped within that window (I believe), and allows it to be dumped from the cache rather than retained unnecessarily.