Q: incremental garbage collection overhead
alain rastoul
alr.dev at free.fr
Wed Nov 21 20:23:25 UTC 2007
Hi
I'm trying to load data from a sql server database (hundred thousands rows)
into Heaps with ODBC/FFI and I noticed that most of the time is spent in
incremental garbage collection (about 80 to 90% of the running time of the
load process!).
I will look at the ODBCResultSet implementation to limit
IdentityDictionnary/Row allocation by working with preallocated arrays but
this will solve only one of my problems.
I was wondering if there is a way to limit incremental collections by
running them only when a certain amount of memory was allocated, I found
setGCBiasToGrowGCLimit in SystemDictionnary (Smalltalk
setGCBiasToGrowGCLimit: 16*1024*1024). but it doesn't work and popup a "a
primitive has failed" error. Is it the right method ?
Another question about garbage collection is the overhead of loaded data in
objects for the VM (hundred MB) : is there a way to know if incremental
collection is bloated by those data or to know when they are moved to old
space ?
Any pointers, ideas or links are welcome
Thanks
Regards,
Alain
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