From owner-freebsd-embedded@FreeBSD.ORG  Thu Jul 26 11:41:43 2012
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Date: Thu, 26 Jul 2012 14:35:51 +0300
From: Aleksandr Rybalko <ray@freebsd.org>
To: freebsd-embedded@FreeBSD.org, jasone@FreeBSD.org
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Cc: adrian@FreeBSD.org
Subject: jemalloc vs old allocator
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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@freebsd.org>