Performance tip - $root.$prefs.$maxCacheClasses

[Doug Easterbrook]

sorry about that..

you can set as an omnis preference, or in code..   you can either


Do $root.$prefs.$maxcachedclasses.$assign(3000)

or

calculate $root.$prefs.$maxcachedclasses as 3000


I'm glad it improved performance.    I seem to think it did the same for me -- and I saw some 2x performance in re-opening windows that I hadn't touched for a while, especially if they were heavy with sub windows, toolbars and lots of 'things within things'

Doug Easterbrook
Arts Management Systems Ltd.
mailto:doug at artsman.com
http://www.artsman.com
Phone (403) 536-1205    Fax (403) 536-1210

> On Dec 22, 2014, at 11:09 AM, Bryan Brodie <brb at appimatic.com> wrote:
> 
> Doug,
> 
> Thanks for this tip - it boosted performance in my dev environment
> substantially under OSX 10.10 Yosemite.
> 
> FYI, I had to code this specifically as:
> Do $root.$prefs.$maxcachedclasses.$assign(3000)
> 
> When I tried "$maxCacheClasses" it failed to pass syntax checking
> 
> My 2¢
> 
> Bryan Brodie
> cloudxix.com / appimatic.com
> 
> On Mon, Dec 22, 2014 at 12:00 PM, <omnisdev-en-request at lists.omnis-dev.com>
> wrote:
> 
>> From: Doug Easterbrook <doug at artsman.com>
>> Subject: Performance tip - $root.$prefs.$maxCacheClasses
>> 
>> hi all:
>> 
>> I was playing around with our Omnis Studio library on the weekend - which
>> has some 3000+ classes in it.   It performs really well, but I hit a small
>> snag trying to make it perform well under the scenario where the library
>> was not on the same drive as the application…   There is a reason that I
>> want the library on a server (macintish - network user situation)
>> 
>> performance went down - dismally.
>> 
>> and then I discovered my saviour — a preference that can be set at run
>> time.
>> 
>> 
>> $root.$prefs.$maxCacheClasses
>> 
>> 
>> initally it was set to 300 (as it has been for years)…. and so I set it up
>> at 5000 - just for giggles.      After the initial load of my library by
>> the omnis runtime, I got a bunch of performance back because more of the
>> classes are being stored in ram.
>> 
>> so if you are not aware of this setting — its worth knowing.
>> 
>> you can also look at
>> sys(190) - to see the number of classes loaded by the runtime and
>> sys(191) - to see the number of classes discarded out of cache
>> 
>> 
>> its really a lot faster if your app is not discarding classes out of the
>> cache because $root.$prefs.$maxCacheClasses is set too low.
>> 
>> thats my learning for the weekend.   hope it helps somebody.
>> 
>> Doug Easterbrook
>> Arts Management Systems Ltd.
>> mailto:doug at artsman.com
>> http://www.artsman.com
>> Phone (403) 536-1205    Fax (403) 536-1210
>> 
>> 
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