Date: Thu, 19 Aug 2010 11:39:38 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: "V. T. Mueller, Continum" <v.t.mueller@continum.net> Cc: "arch@freebsd.org" <arch@FreeBSD.org>, "current@freebsd.org" <current@FreeBSD.org> Subject: Re: Removal of ICC (intel compiler) bits from mk Message-ID: <20100819113938.374618ltvdhg0nok@webmail.leidinger.net> In-Reply-To: <4C6CF627.20205@continum.net> References: <E604222D-A731-4F0E-BF21-FF7F4306A899@gmail.com> <AANLkTimCdcBvgBt1sr2y1_=6fOEGWFFxa=hRwQ5vzyhT@mail.gmail.com> <65F17C45-55C1-4349-A4D1-A3D6AD0D9A80@FreeBSD.org> <4C6C1EB1.5000004@FreeBSD.org> <20100819090128.22597bbvyogdw9wk@webmail.leidinger.net> <4C6CDB3A.1010200@continum.net> <20100819104913.19722klqtkcfy2gw@webmail.leidinger.net> <4C6CF627.20205@continum.net>
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Quoting "V. T. Mueller, Continum" <v.t.mueller@continum.net> (from Thu, 19 Aug 2010 11:15:19 +0200): > Alexander Leidinger wrote: >>> Alexander Leidinger wrote: >>>> If someone would get icc 11.x up and runnig as a port (similar to >>>> what we have for outdated icc version in the ports collection), I >>>> would have a look if my contact at Intel is still working there >>>> in a position which allows him to get a commercial license for us. >>> >>> A while ago it was stated by MySQL AB, that their dbms performs >>> about 20% better when compiled with icc instead of gcc. Is this >>> (still) true? >> >> This looks overly simplified. "It runs better on CPU X with >> benchmark Y on Mainboard Z when you use gcc A.B.C with options D >> and compare it to icc E.F.G with options H." is something you can >> use in such cases, but it doesn't tell you if it will be the case >> on your machines with your workload. >> >> If you want to know if it is faster on your machines with your >> workload, then there is only one way to find it out: try it (be >> warned, due to the amount of optimization options available in >> gcc/icc, something like this will take a lot of time, as there are >> a lot of combinations to try). > > Sounds reasonable. But doesn't that mean, that there is no need to > (take the hassle to) support icc in the future? Especially while > folks are being keen on abandon gcc for clang? It may matter in the HPC community where optimization to a specific CPU matters (it doesn't matter that much for MySQL). There it does not matter much to have the kernel compiled with icc, but a icc port would be handy for them. Bye, Alexander. -- I hold it, that a little rebellion, now and then, is a good thing... -- Thomas Jefferson http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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