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From: DJ Delorie <dj@redhat.com>
To: Steve Vormwald <sdvormwa@cray.com>
Cc: libc-alpha@sourceware.org
Subject: Re: [PATCH] malloc: Deprecate hook variables, __default_morecore, <mcheck.h>
References: <915065cd-079b-0f7b-eebf-7ca835ca4030@redhat.com>
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Date: Mon, 21 Nov 2016 19:43:00 -0000
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	(Steve Vormwald's message of "Fri, 18 Nov 2016 17:29:28 +0000")
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Steve Vormwald <sdvormwa@cray.com> writes:
> The usual culprit is something "caching" small (<128byte) allocations for
> future reuse rather than freeing them when they become unused, which

Have you tried disabling fastbins?  I.e. mallopt(M_MXFAST, 0) ?