RE: [Zope] CacheManagers are cool :)
anybody tried expiring an object,? say after 300 secs, the cached object expires, get invalidated and a new cached object is created when somebody requested the page. is there any simple way to expire a RAM Cache? haven't tried this yet. also, for those who tried caching. what do you guys do? cache the methods that make up the bigger method? or just cache the bigger method? e.g dtml method a is made from method b, c, d,...n do you cache a, or selectively cache b and/or c, d, ... it depends on what's in each element. the design of the caching system is such that you can have as fained-grained a control as you wish. the decision is entirely up to you. my fairly amateurish tests suggest that the benefits of caching only really manifest themselves at high levels of concurrency. if the method (a) contains a little logic, items (b),(c) and (d) are images, and the whole page is very frequently accessed, you'd probably benefit from caching (a) in RAM, and using the HTTP Cache manager for the other elements. OTOH, you could expect proxies and browser caches to handle elements such as images fairly well, so I imagine most of the benefit would come from caching only the element of the page which contains the logic. If the page is accessed only a hundred times a day, you will see little benefit from caching it, at the cost of some memory on your server. in a scenario where (b), (c) and (d) each contain their own snippets of logic, you would be wise to cache them all. Otherwise you would lose the benefits of caching (a), because to build the page, Zope is still making hits to disk each time. well, that's how I assume it works, anyway. time for more tests, i think... seb ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] CacheManagers are cool :)
On Monday 29 January 2001 10:15, Seb Bacon wrote: I've just been experimenting with the RAM Cache manager, and FWIW I thought I'd share my findings: I ran some simple tests using ab against a single, dynamic page which has some display logic both in the filesystem product and dtml. I cached the index_html using the default RAM Cache Manager settings. Without caching, response time appeared to increase in direct proportion to the number of simultaneous requests up to 10. Above 10 connections, response time worsened dramatically. When there were 15 simultaneous connections, the response time averaged at approximately 10 seconds. The relationship looked logarithmic, but I didn't really take enough samples to be sure. Plus, the system I tested it on only has 96Mb RAM, and it was swapping a bit. In all cases the cache improved performance. The average response time was improved by up to 70% where more than 10 concurrent users were simulated. There was an improvement of 20% - 25% between 5 and 10 concurrent requests. There was no significant improvement where there were no concurrent requests. The relationship between the number of simultaneous requests and the response time remained linear across all measured levels of concurrency. very cool. although i find the lack of improvement on a non concurrent requests a bit strange if its a the dtml is doing real computation vs. serving a string from memory. Not exactly a real-life usage scenario, but it sounds impressive :) Not sure I understand what the cache keys are for though... is there any more documentation forthcoming on this? so you can cache requests based on dynamic input. useful for authentication to present different cache pages to different users, and also to present common request dependent information from cache. as for real documentation, use the source luke k ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] CacheManagers are cool :)
I've just been experimenting with the RAM Cache manager, and FWIW I thought I'd share my findings: ... There was no significant improvement where there were no concurrent requests. very cool. although i find the lack of improvement on a non concurrent requests a bit strange if its a the dtml is doing real computation vs. serving a string from memory. so do I :) the dtml only iterates over some objects. each object has a method which checks the authenticated user and serves up content accordingly. in the test case the user is served the default view of the object, so there's not really all that much logic going on. perhaps this is why non concurrent, cached requests showed only a 1.3% speed improvement over uncached requests. anyone? Not exactly a real-life usage scenario, but it sounds impressive :) Not sure I understand what the cache keys are for though... is there any more documentation forthcoming on this? so you can cache requests based on dynamic input. useful for authentication to present different cache pages to different users, and also to present common request dependent information from cache. I already read this in the online help, but for some reason my brain only chose to understand it just now ;) as for real documentation, use the source luke hmm, just had a quick 20 minute poke around, and I get the gist, but I'd be happier if some obi-wan could guide me with the api docs promised in the fishtank proposal seb. ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] CacheManagers are cool :)
Not exactly a real-life usage scenario, but it sounds impressive :) Not sure I understand what the cache keys are for though... is there any more documentation forthcoming on this? so you can cache requests based on dynamic input. useful for authentication to present different cache pages to different users, and also to present common request dependent information from cache. as for real documentation, use the source luke anybody tried expiring an object,? say after 300 secs, the cached object expires, get invalidated and a new cached object is created when somebody requested the page. is there any simple way to expire a RAM Cache? also, for those who tried caching. what do you guys do? cache the methods that make up the bigger method? or just cache the bigger method? e.g dtml method a is made from method b, c, d,...n do you cache a, or selectively cache b and/or c, d, ... confusedly, yours k ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev ) -- http://www.kedai.com.my/kk http://www.kedai.com.my/eZine Help me save me from myself... ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
