jemalloc vs old allocator

[Aleksandr Rybalko]

On Fri, 27 Jul 2012 10:04:27 -0700
Adrian Chadd <adrian at freebsd.org> wrote:

>> Just as a note, ray@ compared jemalloc-HEAD with an older jemalloc.
>> 
>> I've just asked him to compare it to phkmalloc from -8. He'll
>> hopefully post those results soon.
>> 
>> Still, great work. :)
>> 
>> 
>> 
>> Adrian
>> 
>> 
>> On 26 July 2012 04:35, Aleksandr Rybalko <ray at freebsd.org> wrote:
>> > Hi,
>> >
>> > I believe what Jason Evans done many test before commit jemalloc,
>> > but made by myself simple test for embedded environment. And get
>> > following results:
>> >
>> > 1. old malloc:
>> > Sum of RSS of userland programs: 28544K
>> >
>> > sysctl vm.vmtotal:
>> > System wide totals computed every five seconds: (values in
>> > kilobytes) ===============================================
>> > Processes:              (RUNQ: 1 Disk Wait: 1 Page Wait: 0 Sleep:
>> > 19) Virtual Memory:         (Total: 2372224K Active: 250316K)
>> > Real Memory:            (Total: 18096K Active: 11392K)
>> > Shared Virtual Memory:  (Total: 15824K Active: 5288K)
>> > Shared Real Memory:     (Total: 2644K Active: 2408K)
>> > Free Memory:    2192K
>> >
>> >
>> > 2. jemalloc with MALLOC_PRODUCTION:
>> > Sum of RSS of userland programs: 21196K
>> >
>> > sysctl vm.vmtotal:
>> > System wide totals computed every five seconds: (values in
>> > kilobytes) ===============================================
>> > Processes:              (RUNQ: 1 Disk Wait: 1 Page Wait: 0 Sleep:
>> > 19) Virtual Memory:         (Total: 2380988K Active: 257820K)
>> > Real Memory:            (Total: 19048K Active: 12144K)
>> > Shared Virtual Memory:  (Total: 16180K Active: 5392K)
>> > Shared Real Memory:     (Total: 2664K Active: 2392K)
>> > Free Memory:    2440K
>> >
>> > I check it on DIR-632(Atheros AR7242 with 32M RAM) between 10-20
>> > mins of uptime. Device behave identical in both cases.
>> >
>> > So if "something" new take more memory than before, that
>> > "something" is not a jemalloc :)
>> >
>> > P.S. Many thanks to Jason for such great job!
>> >
>> > WBW
>> > --
>> > Aleksandr Rybalko <ray at freebsd.org>

Hi all,

so, unlike both jemallocs, Poul's version of malloc born with more free
memory:

Sum of RSS of userland programs: 25444K

sysctl vm.vmtotal:
System wide totals computed every five seconds: (values in kilobytes)
===============================================
Processes:              (RUNQ: 1 Disk Wait: 1 Page Wait: 0 Sleep: 19)
Virtual Memory:         (Total: 2163524K Active: 59196K)
Real Memory:            (Total: 16656K Active: 10144K)
Shared Virtual Memory:  (Total: 5620K Active: 5200K)
Shared Real Memory:     (Total: 2552K Active: 2356K)
Free Memory:    3140K

But after half a day with some minor activity (logs on tmpfs, racoon
connect attempts, etc.) free memory goes down to:

Free Memory:    2316K

and continue get more and more memory, after full day, it is around
1.5M free.

-- 
Aleksandr Rybalko <ray at freebsd.org>