2 Responses to “why is the random read speed changing?”

1. 

   Crisse
   Jan 18, 2009
   

   Hi,

   I have noticed the same thing. I think the speed changes depending which files are located in eBoostr cache. Here is one example:

   I updated my eBoostr to the latest version 486 and re-defined cache devices (I have two SD-cards: SanDisk Extreme III 4GB and SanDisk Extreme III 8 GB, both 20x meaning that the have maximum read speed 20 MB/s).

   eBoostr measured random read speeds, 4 GB one had about 19200 KB/s and 8GB one had about 19700 KB/s.
   Later I excluded from cache the file types *.doc and *.pdf and re-generated the cache. After that speeds went down, 4 GB memory card had random read speed about 12300 KB/s and 8 GB memory card had 14200 KB/s. Now random read speed of devices are 12320 KB/s and 15462 KB/s.

   The developers of the program can probably give the best answer to your question why the speed changes, but my opinion is that the following things affect to the speed:

   1. How often you use the files which are in the cache.

   2. Which of your files are in the cache. If you do not exclude anything to be cached, probably the random read speed would better.

   3. The speed of the device(s) you use for eBoostr cache

   Best regards
   Christian S. aka Crisse

   
   
2. 

   Andrey Zarudnev
   Jan 19, 2009
   

   Thank you, Crisse, you are right. We are measuring the speed of the device by emulating random reads of the actual files located in the cache–thus the speed strongly depend on its contents. However +-13000 reported by Emile is not normal, usually fluctuation should be in +-5000 KB/s interval.

   Emile, this speed is remeasured after each cache update. Can you please run several manual updates and check if the speed will get into normal state?