2010/11/15 Lachlan Deck <lachlan.d...@gmail.com> > On 16/11/2010, at 5:15 AM, Pascal Robert wrote: > > > That's one of the top 5 questions people ask, but not much answers. For > the EOF cache, you can use the ERJGroupsSynchronizer to synchronize EOs > between instances. > > Wasn't there a WOWODC topic on this?
On ERJGroups, yes, it's in Project Wonder in Depth, one of the sessions available to buy. > > On 16/11/2010, at 3:43 AM, Greg Lappen wrote: > > > >> Hi everyone, > >> > >> Based on using WO for the last 7 years, I have observed a couple of > things > >> that seem to be a performance bottleneck in WebObjects. I know that > Apple > >> uses WebObjects on a large scale for iTunes and ecommerce, so there must > be > >> solutions to these. > >> > >> #1 - Only one thread can be processing at once. I seem to recall that > this > >> is a limit in EnterpriseObjects but it's been a while. > > WOAllowsConcurrentRequestHandling=true + ProjectWOnder EC auto-locking. > > >> #2 - EnterpriseObjects caches every object from the database. > > Some simple starting points to consider: > - Don't fetch every row from the database. Fetch with appropriate filtering > :-) > - caching is good > - control cache time appropriately to allow object cache expiry > - use temporary ecs to allow garbage collection > > more advanced options available via wonder. > > >> With that being said, how can you horizontally scale your application > layer? > >> If you setup more instances of your app, they each have their own > caches, > >> which will be out of sync with each other. Is there a commonly used > >> framework for doing distributed cache management? > > Pascal mentioned ERJGroupsSynchronizer in wonder. There's also > ERChangeNotificationJMS and ERCaching in Wonder. I'm not familiar at the > moment with which of these are the preferred approach. It may depend on your > needs. > > >> And is it possible to > >> make your applications multithreaded so page requests can be processed > >> concurrently? > > See above. > with regards, > -- > > Lachlan Deck > >
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