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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Changes in Lua 5.2 - Garbage Collection

The garbage collection changes aren't coding changes - they will effect the internal efficiency and fix some issues there. Ephemeron tables are somewhat linked as they're providing a solution to a garbage collection issuse that required solution.

There's a change to a generational collector at some collection cycles which prioritises speed of collection on that cycle over a thorough collection, with remaining garbage still collected at the next full cycle. Generational collectors are based on the theory that objects are likely to be very shortlived, or to survive for a long period, with few being released and dying in middle age. And that although memory may be split equally between very young and mature objects, the longeivity of the mature objects means that the rate of death and return from a limited garbage collection cycle amongst the young objects is significantly higher per object than for the mature ones.

As even in the writing of programming languages, you'll find parallels elsewhere - in this case look at the Java model - see [here]
(written 2012-04-08, updated 2012-04-14)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
U198 - New in Lua 5.2
  [3683] Weak references in Lua - what are they, and why use them? - (2012-04-04)
  [3686] The goto statement in Lua - (2012-04-06)
  [3687] Binary / bitwise operations in Lua with the standard bit32 library - (2012-04-06)


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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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