[GNUnet-developers] Databases benchmark and problem

[eric haumant]

Hello,

I've just made some tests with the five database types of GNUnet. This
results have been made with a 100Mo file (with random content) that have
been inserted in the database. Here is the results :

- MySQL : 
   Upload Speed : 400 ko/s
   Download Speed : 300 ko/s
   Space used : 113 Mo.


- GDBM : 
   Upload Speed : 500 ko/s
   Download Speed : 400 ko/s
   Space used : 148 Mo.

- TDB : 
   Upload Speed : 27 ko/s
   Download Speed : 12 ko/s
   Space used : 118 Mo.

- BDB : 
   Upload Speed : 340 ko/s
   Download Speed : 260 ko/s
   Space used : 435 Mo (DISKQUOTA=300 !!).

- DIRECTORY : 
   Upload Speed : 100 ko/s
   Download Speed : 300 ko/s
   Space used : 450 Mo (DISKQUOTA=300 !!).


While benchmarking, I had some problem with local file download. With most
of the database types (except TDB) the download drops down at the beginning
and at the end. I have to restart the download a few times to continue. 

As you can see, TDB is very slow and BDB uses lots of place (not as much as
DIRECTORY). So, for the moment MySQL and GDBM are the most powerfull
databases.

I found another thing interesting. When inserting content, the "DISKQUOTA"
that is specified has no importance. You can, then, use lots of space.
GNUnet should stop the insertion and say that there is no more space left.

Eric.