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From: "nsz at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug malloc/14581] memalign allocations are often not reused after
 free
Date: Thu, 15 Dec 2022 10:29:16 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D14581

--- Comment #23 from Szabolcs Nagy <nsz at gcc dot gnu.org> ---
i tried on both aarch64 and x86_64 upstream master and if i add vmstat() at=
 the
very end of main with

static void vmstat(void)
{
        char buf[1000];
        FILE *f =3D fopen("/proc/self/status","r");
        while (fgets(buf, sizeof buf, f))
                if (buf[0] =3D=3D 'V') fputs(buf, stdout);
        fclose(f);
}

then it prints

VmPeak:   316888 kB
VmSize:   316888 kB
VmLck:         0 kB
VmPin:         0 kB
VmHWM:    314636 kB
VmRSS:    314636 kB
VmData:   314652 kB
VmStk:       132 kB
VmExe:         8 kB
VmLib:      1480 kB
VmPTE:       660 kB
VmSwap:        0 kB

i.e. >300MB is used (if compiled with -O1 then memset is avoided so RSS is
small but VmPeak is still big). i also see >100 brk calls in strace. i dont
know what might be different in my environment.

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