Date: Sat, 21 Feb 2009 23:56:15 +0100 (CET) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Junsuk Shin <junsukshin@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: read two files simultaneously Message-ID: <20090221235530.C60480@wojtek.tensor.gdynia.pl> In-Reply-To: <7873ac110902211146k6a8ee7d0pd67edc559ed14b15@mail.gmail.com> References: <7873ac110902211146k6a8ee7d0pd67edc559ed14b15@mail.gmail.com>
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> I'm just guessing inode structure, the physical file location on HDD > might be related to this. But, if I read only one file, the size > doesn't matter. Reading file (10M, 100M, 700M) gives constantly about > 70MB/s, and the weird thing happens when I read 2 files of big size. if you use O_DIRECT it's read from disk exactly as you specified, without readahead, so you do a lot of seeks. simply use bigger buffer like 1MB
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