Mac OS 9 Lives

Mac OS 9 Discussion => Hardware => Storage => Topic started by: tunedbytad on April 29, 2020, 06:50:45 PM

Title: Is it possible completely turn off Disk Cache.?. Testing SSD performance?
Post by: tunedbytad on April 29, 2020, 06:50:45 PM

Is it possible completely turn off Disk Cache.?. 

if so how?

I am doing testing on Disk Caching features effect on SSD performance?

that post is here:
http://macos9lives.com/smforum/index.php/topic,5455.0.html

Title: Re: Is it possible completely turn off Disk Cache.?. Testing SSD performance?
Post by: tunedbytad on May 10, 2020, 08:17:24 PM

Anyone have any input at all?

Turning Disk Cache off has to be possible....

Title: Re: Is it possible completely turn off Disk Cache.?. Testing SSD performance?
Post by: teroyk on May 11, 2020, 02:48:37 AM

Quote from: tunedbytad on May 10, 2020, 08:17:24 PM

Anyone have any input at all?

Turning Disk Cache off has to be possible....

Complete off might not possible. I think you need at least 4KB or 8 KB for write.
Even 8-bit computers have 512 bytes memory to cache writing to floppy disk,
although they write to disk before they return from write routine.

EDIT: Or there maybe can be some clever Direct Memory Access routine for read,
but who knows?

Title: Re: Is it possible completely turn off Disk Cache.?. Testing SSD performance?
Post by: IIO on May 11, 2020, 03:50:58 AM

wouldnt it be the speed test application´s job to ignore accessing the cache?

Title: Re: Is it possible completely turn off Disk Cache.?. Testing SSD performance?
Post by: IIO on May 11, 2020, 04:31:26 AM

i guess what is more interesting for test results is to purge RAM / reboot before you test, in situations where you had 100 programs open already.