Search found 50 matches
- Wed Nov 25, 2020 11:56 am
- Forum: Submit Suggestions
- Topic: Compression (with an option to turn it on/off) for cache data
- Replies: 5
- Views: 566
Re: Compression (with an option to turn it on/off) for cache data
I agree It's not easy - but it does take an effort to make something good. Currently L1 cache does not offer much more than windows cache. Compression would be a big advantage. There are open source libraries for most compression algorithms. You could add a compression type attribute to blocks - lik...
- Wed Apr 08, 2020 10:31 am
- Forum: Submit Suggestions
- Topic: Compression (with an option to turn it on/off) for cache data
- Replies: 5
- Views: 566
Compression (with an option to turn it on/off) for cache data
I want to request compression (with an option to turn it on/off, choose algorithm) for cache data (not meta data). ZFS is using compression for it's cache with near zero impact on performance/cpu usage with LZ4 compression - a really high speed algorithm. I don't know what's the license for it, but ...
- Wed Apr 08, 2020 10:25 am
- Forum: Submit Suggestions
- Topic: More Detections
- Replies: 4
- Views: 1364
Re: More Detections
I don't know how possible it is to cache network drives (like samba), but caching on the remote computer doesn't do much. If I share RAM drive it's still slow for small files. The bottle neck is the protocol. I don't know why, but it's extremely slow accessing 1000s of small files - like 10 to 100 t...
- Sun Jan 14, 2018 12:51 pm
- Forum: Technical Support
- Topic: Problem with prefetch v3.0.2
- Replies: 4
- Views: 2386
Re: Problem with prefetch v3.0.2
ok, but what about the option to not fetch from more than one partition of a specific physical drive at a time?
- Sat Jan 13, 2018 12:06 pm
- Forum: Technical Support
- Topic: Non-deferred write cache
- Replies: 5
- Views: 2498
Re: Non-deferred write cache
So if the user expects most of the written data to not be read (like log files), then he shouldn't enable write cache. If he expects that soon the written data will be read again (like temporary tables of database) then write cache could be enabled.
- Sat Jan 13, 2018 12:02 pm
- Forum: Technical Support
- Topic: Problem with prefetch v3.0.2
- Replies: 4
- Views: 2386
Problem with prefetch v3.0.2
Hi, I have problem with prefetch. Sometime ago I requested that prefetch of the same physical drive don't happen on the same time to speed it up. In 3.0.2 that's not only not fixed, but it got worse. I have 2 partitions cached C: and E: of the same hard disk. C: is set to start prefetch at windows b...
- Sat Dec 16, 2017 8:07 am
- Forum: Technical Support
- Topic: Non-deferred write cache
- Replies: 5
- Views: 2498
Non-deferred write cache
Does L1 write cache actually do anything if it's not deferred? Does it really speed up anything if it has to write the cache to disk right away. Isn't that the same as if there is no write cache?
- Sun Sep 10, 2017 7:27 am
- Forum: Technical Support
- Topic: Pause/Resume prefetch
- Replies: 5
- Views: 2505
Re: Pause/Resume prefetch
I fixed the problem. The partition was copied 1:1 from an SSD. It has been on the SSD for ages, so it got very fragmented. When I copied it to a HDD booting got so slow that it was past the delay of prefetching. Defragmenting fixed it. Now booting stops before prefetch starts.
- Wed Sep 06, 2017 8:57 am
- Forum: Technical Support
- Topic: cache replacement policy
- Replies: 2
- Views: 1817
cache replacement policy
Hi, Does primocache have an algorithm to reduce penalty of big files that are read only once or full hdd backups? In such case does primocache preserves most commonly used cache? If not you might want to implement something like ARC . In fewer words arc is divided to two sections - one for recently ...
- Wed Aug 09, 2017 7:53 am
- Forum: Technical Support
- Topic: Pause/Resume prefetch
- Replies: 5
- Views: 2505
Re: Pause/Resume prefetch
The SSD is not loosing cache. The SSD itself is disappearing, which is hard disk problem not primocache. The problem I have is with prefetch kicking in the wrong moment, while OS still haven't finished loading. If you have a lot of ram and slow hard disk the OS loading time is bigger and it overlaps...