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From Reinhard Pötz <>
Subject RE: Persistent store seems slow
Date Mon, 18 Aug 2003 05:28:26 GMT
Hi Upayavira,

I saw that you checked in some changes to the CLI using the Persistence
store. Are the problems desribed below solved?

If not, I had a RT when reading your mail: What about an external memory
store for CLI operations?


> -----Original Message-----
> From: Upayavira [] 
> Sent: Saturday, August 16, 2003 4:16 PM
> To:
> Subject: Persistent store seems slow
> In looking into the caching system for the CLI, I found the fact that 
> the caching system wasn't being correctly written to disc on shutdown.
> Vadim fixed that.
> So one would therefore expect pages that have been placed in the 
> persistent store to be generated faster than previously, as page 
> generation is no longer required - just reading from the cache.
> However, this does not seem to be the case. From my 
> investigations (by 
> adding code to the CLI to report the duration spent generating each 
> page), it seems that page generation is now _slower_, when 
> the page has 
> been put into the persistent store :-(
> I notice that, in a pipeline that involves aggregation and 
> the cocoon: 
> protocol, you get multiple reads from the cache. Presumably only the 
> last is actually used.
> This is a very unfortunate response, as I was looking forward 
> to the 10x 
> performance improvements that the MRUMemoryStore offers!
> Is there likely to be anything I can do to speed up the 
> persistent store?
> Would it be possible to just get the last modified date from 
> the cache 
> without the content, as in fact that is all I really want.
> Hope you guys can help.
> Regards, Upayavira

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