Date: Mon, 11 Jun 2012 12:20:32 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-hackers@freebsd.org Subject: Re: SuperPages utilization survey Message-ID: <jr4gpg$5uf$2@dough.gmane.org> In-Reply-To: <4FCFE714.6070502@FreeBSD.org> References: <jqac8f$6mn$1@dough.gmane.org> <1073159468.20120602121458@serebryakov.spb.ru> <4FC9D420.6010203@FreeBSD.org> <alpine.BSF.2.00.1206021054120.40882@wojtek.tensor.gdynia.pl> <4FC9D68D.60405@FreeBSD.org> <alpine.BSF.2.00.1206021228320.43360@wojtek.tensor.gdynia.pl> <CAF-QHFUhOF=aW5Y2LRByH5wi%2BKsezMyrZuUL0w0AQCNweEGTaA@mail.gmail.com> <4FC9FDBE.6080401@FreeBSD.org> <op.wffo7ogu34t2sn@tech304> <4FCFE714.6070502@FreeBSD.org>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigD92FCDDBAD220341696BF1A6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 07/06/2012 01:26, Florian Smeets wrote: > On 05.06.12 16:29, Mark Felder wrote: >> On Sat, 02 Jun 2012 06:49:18 -0500, Florian Smeets <flo@freebsd.org> w= rote: >> >>> As far as i understand it does at least enable usage of pages up to 4= MB, >>> perhaps someone should teach mysql about the FreeBSD's limits? >>> If you look at the output i sent, it certainly changes from using no >>> superpage mappings at all to using them to some degree, if you script= >>> can be trusted >> >> Wow, this is a nice find. If someone were to add a patch for FreeBSD's= =20 >> superpages we might be able to get a nice little performance boost wit= h =20 >> little effort. Even the increase to 4MB for now is a welcome improveme= nt. =20 >> I'll make sure to put this in my toolbox.... >=20 > I played with this some more. MySQL does not seem to use superpages. > After a mysqld restart Ivan's script and procstat showed superpage > mappings for mysqld, but it seems once MySQL "touches" the memory it's > not in superpages anymore. I looked at the MySQL code a bit and one > would need to add FreeBSD support in a couple of places. Perhaps I'll > find some time to try this, but i cannot make any promises. If I understand how superpages are promoted correctly, you may get a nice effect simply by changing malloc()s of 2MB+ sizes to calloc()s. --------------enigD92FCDDBAD220341696BF1A6 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk/VxnEACgkQ/QjVBj3/HSzTYQCfR4Fy9qtg871oD/pSqrQQdIDj EAYAn0FSPovwRGh27bqC99bfcSjN611u =jqZU -----END PGP SIGNATURE----- --------------enigD92FCDDBAD220341696BF1A6--
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