Virtual memory consumption (both user and kernel) in modern CURRENT

[Jason Evans]

On Feb 17, 2006, at 12:07 PM, Mike Jakubik wrote:
> Jason Evans wrote:
>> Are redzones enabled?  (They are turned on by default in  
>> CURRENT.)  You can check by reading the output from something like:
>>
>>     MALLOC_OPTIONS=P ls
>>
>> Keep in mind that they use up substantial extra memory -- 32 bytes  
>> per allocation.  Unless you have disabled redzones, you should  
>> expect much higher memory usage with jemalloc than with phkmalloc.
>
> ___ Begin malloc statistics ___
> Number of CPUs: 1
> Number of arenas: 1
> Cache slots: 256
> Chunk size: 16777216 (2^24)
> Quantum size: 16 (2^4)
> Pointer size: 4
> Number of bins: 128
> Maximum bin size: 2096
> Assertions enabled
> Redzone size: 16
   ^^^^^^^^^^^^^^^^
> Allocated: 22272, space used: 33554432
>
> Does this mean they are enabled? and if so, how can i disable them?  
> Which malloc is in -current now?

Yes, redzones are enabled.  Redzone size is 0 when they are  
disabled.  You can disable them by adding the following to /etc/ 
make.conf, then rebuilding/installing libc:

	CFLAGS+=-DNO_MALLOC_EXTRAS

jemalloc is currently in use for CURRENT.

Jason