[fpc-devel] Re: Compiler bottlenecks

Florian Klaempfl florian at freepascal.org
Thu Jul 15 11:43:16 CEST 2010

Mattias Gärtner schrieb:
> Zitat von Jonas Maebe <jonas.maebe at elis.ugent.be>:
>> Michael Schnell wrote on Thu, 15 Jul 2010:
>>> Did somebody take a look at FastMM for Delphi ? (
>>> http://sourceforge.net/projects/fastmm/ )
>>> Same seems to use a nice paradigm doing the Memory management for
>>> threaded applications.
>> Then please explain that paradigm, since apparently you already looked
>> at it.
>> In return, I will explain the FPC heap manager's paradigm: per thread,
>> there is a separate heap manager so that in most cases no
>> synchronisation is required. Only if memory is allocated in one thread
>> and freed in another, then it will be added to a global locked
>> structure. When a thread runs out of memory in its pools, it will
>> first check this global (synchronised) structure before asking for
>> more memory from the OS.
> Does that mean, if I let a worker thread create strings, pass them to
> the main thread, free the worker thread and unreference the strings in
> the main thread the global structure will grow and grow?

No, because the worker thread looks into the global structure when it
runs out of "local" space.

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