[ZODB-Dev] performance of chunked data over ZEO

[Paul Winkler]

On Sun, Nov 28, 2004 at 10:33:08PM +0100, Tino Wildenhain wrote:
> Hi,
> 
> Am Sonntag, den 28.11.2004, 20:56 +0100 schrieb Andreas Jung:
> > Inside an application that stored large amounts of data in the ZODB as 
> > linked
> > structure (very similar to the Pdata magic in OFS.Image) I discovered that
> > the chunk size has a significant influcence on the performance.  Using a 
> > chunk
> > size of 16k (which is also the default in OFS.Image) I got the expected 
> > transfer
> > rate of about 2-3MB/second. Increasing the chunk size to 64K caused a 
> > performance
> > loss to about 100-150 KB/seconds. Any ideas why increasing the chunk size
> > causes such a dramatic performance loss?
> 
> Isnt the typical pdata chunk size not 1<<16 which is 64K?

Yes.

-- 

Paul Winkler
http://www.slinkp.com