Date: Fri, 4 Dec 1998 13:48:36 +0100 (MET) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: toasty@home.dragondata.com (Kevin Day) Cc: hackers@FreeBSD.ORG Subject: Re: Nonblocking page fetching Message-ID: <199812041248.NAA08298@labinfo.iet.unipi.it> In-Reply-To: <199812041431.IAA27124@home.dragondata.com> from "Kevin Day" at Dec 4, 98 08:31:20 am
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> I have an application where I'm streaming large amounts of data from disk, ... > The hack I ended up using was another process that I could tell that I > needed the frames, and all it did was sit in a for loop touching every page, > to force them to be brought in. > > This has some obvious disadvantages, but it stopped my movie player from > sitting in vmwait when it could be doing other things. is it so bad ? The forked process should consume very little memory and because they are local you can even resort to or some cheap local IPC mechanism to synchronize them. From a portability point of view i think this is going to be to be better than provide a specialised syscall. > One final note... Does anyone know what effect turning off the bzero on new > pages would be? Security is not an issue in this system, as it's not again how bad is it ? bzero is generally done in the idle loop if i am not mistaken so you should not be affected too badly by that unless you are at or near 100% CPU usage. cheers luigi -----------------------------+-------------------------------------- Luigi Rizzo | Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it | Universita' di Pisa tel: +39-50-568533 | via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 | http://www.iet.unipi.it/~luigi/ _____________________________|______________________________________ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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