[Gcl-devel] GCL memory allocation/gc environment variables (was Re: [Maxima-discuss] Maxima testsuite with GCL)

[Camm Maguire]

Greetings!

Variable            Type   Default  Description

GCL_MEM_MULTIPLE    float  1.0      fraction of runtime ram to consider
GCL_GC_PAGE_THRESH  float  0.5      only GC past this heapsize fraction of 
working mem
GCL_GC_ALLOC_MIN    float  0.05     minimum alloc fraction between GCs
GCL_GC_PAGE_MAX     float  0.75     GC at minimum alloc past this heapsize

GCL_MULTIPROCESS_MEMORY_POOL 
                    bool   false    aggregate allocation across multiple 
processes

Just set GCL_MEM_MULTIPLE to 0.5 to run in 50% of physical RAM, etc.

The next three variables regulate GC.  The basic idea is to trigger GC
based on the recent allocation, with no GC up to a heapsize of
PAGE_THRESH, then lowering the allocation hurdle linearly to ALLOC_MIN
at a heapsize of PAGE_MAX and larger.

GCL_MULTIPROCESS_MEMORY_POOL will likely default to true at release.
This is being tested now.

Take care,

Wolfgang Dautermann <address@hidden> writes:

> On 2017-09-06 18:30, Camm Maguire wrote:
>> Greetings!  Recent GCL will attempt to make use of all available
>> memory (without swapping) to optimize performance.  This is
>> configurable with environment variables.
>
> Hi,
> thanks for your reply. Which enviroment variables can I set to reduce
> the agressive memory consumption?
>
> The testsuite does not run out of memory (here I have 8GB ram, 16GB
> swap), but maybe I want to use the PC for other processes, not
> exclusively for GCL.
>
> Best regards, Wolfgang
>
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-- 
Camm Maguire                                        address@hidden
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