[Pharo-dev] GildaVM - a Non-Blocking I/O Architecture for the Cog VM

Ben Coman btc at openinworld.com
Thu Nov 21 00:06:12 EST 2019


I saw an interesting tweet on "GildaVM: a Non-Blocking I/O Architecture for
the Cog VM" [1]
which shows the VM running multiple interpreter-threads.
Where is the paper shown on page 23 available?

Side thought, if  "usually, 1% of objects survive their first scavenge" [2]
as a "breadth-first traversal of objects from the remembered table (a table
holding all old objects referencing new objects) and the stack"

that implies only a small percentage object mutations were in old space (??)

which makes wonder if each interpreter-thread had its "own" new-space,
then scavenging each new-space could run independently in
parallel-native-threads?
Thus a global lock may only(?) be needed to mutate a shared old-space and
minimize   .

This ignores the execution-engine needing to update method-lookup tables.
Could native-threads start with their own copy of a warmed up JIT and then
work independently?

cheers -ben


[1]
https://www.slideshare.net/esug/gildavm-a-nonblocking-io-architecture-for-the-cog-vm

[2]
https://clementbera.wordpress.com/2017/03/12/tuning-the-pharo-garbage-collector/
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