Re: [ZODB-Dev] Ackward PersistentList read Performance

2013-08-13 Thread Joerg Baach
Hi Jim, Malthe, thanks a lot for your advice, really appreciated. I think I get what you mean, but will read up a bit to fully understand whats going on, and to write accordingly (I need the best read throughput I can get, and don't need to bother much with the writes). Cheers, Joerg _

Re: [ZODB-Dev] Ackward PersistentList read Performance

2013-08-13 Thread Jim Fulton
On Tue, Aug 13, 2013 at 9:40 AM, Joerg Baach wrote: > Hi *, > > I was trying to measure the impact of using different kind of objects to > store data in ZODB (disk, ram, time). > > Whats really ackward is the measurement for reading content from > PersistentLists (that are stored in an IOBTree): >

Re: [ZODB-Dev] Ackward PersistentList read Performance

2013-08-13 Thread Malthe Borch
On 13 August 2013 15:40, Joerg Baach wrote: > So, can it really be that using a PersistentList is 300 times slower? Am > I doing something completely wrong, or am I missing something? In your test setup, you commit the transaction and close the connection. This means that when you iterate through