-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Shawn Rutledge wrote: > On 8/16/05, Hans Reiser <[EMAIL PROTECTED]> wrote: > >>Reiser4 does a very nice job of packing the tree tightly, which is >>independent of seeks. Ditto for compression plugin. >>He merely needs to ignore some code, he is not harmed by it. If he >>wants to write a new block allocator, sure, why not, we have allocator >>plugins yes? His will just be simpler..... > > > But the most important thing is to reduce the number of writes as low > as possible.
Something Reiser4 does very well. If you have enough RAM, it's possible to avoid any reads/writes at all -- given enough RAM, it behaves as a ramdisk, which is why I wish I knew how to tell Gentoo to *not* mount tmpfs over /dev. One other thing you might try is disabling the write-twice behavior. Currently, if you've got a huge, fairly well-sorted file that you're making lots of tiny writes to, such as a database, it makes sense to write twice to keep the file from getting fragmented. But, fragmentation isn't nearly as much an issue on truly random-access media, so you'd want the default small-file behavior to be used everywhere -- first write the data to the new location, then atomically update the pointer to it as you deallocate the old location. Am I right about this? I'm not feeling very lucid today... -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iQIVAwUBQwJo9HgHNmZLgCUhAQK92BAAk68ZQsOMyS3TTKmu3//gkC+/RHzrNXey UR2YxH+FdC7BDR3Py2Mmot3F7Ch5ykdT3gRzbMQ3vTQoRDlcmIVOuQ4VqfJ4vN2a CVWVxc0X38fF7QVMoHnlwX6mRlr7PTd64BZEmYJ8cdDkPmAUrlCe0/+vLmorc2Oo 3Wwz3rtLotu+7Z4sjWvboqyXFoX8hvt0iSo+45UnQI7bNwdbWCpFZBTsbU9SsI4J NnplO/IG1d5jQq+Vdmo7lL0XB+Zv71s9u0l/QNe5eahLNUfzghrTVTZSpJT/+h3b xSPMy2xVurG7p2jp3Rg8sN0YMiAGaQtVr9yhvcinZnmVOY9HK272Epihg3eUHYIX LiKkCLblLaUiwJs6DKSCoCsF3oWELH/SsYC31R4fSWEVehObRIoU/Kz4TRtOeA0G SakH4s+Hiju4GPTL7AKaMMi2TbeZgGg7BlZof+zC5HgQf7d2t0/sb2613X0R5agH tQyiX7PDg+zQr4KXC8Rb3kwwcgURMcAUWw6gcJ+hTbFrLtlkvK9k1VJNmllH7j8J aYTsz3FCgGo5a7zq4iogFt7GgnHeTJ3ErxjohK0uE3J10l68DvVa3TqaanGXdhDK pqhfduXM+pt8FLoXuHVkp1c4VpZMzj4WWKPNOhH+FTxCVJee6ZeMckV+9AUbZkkW ja3lcplEEMM= =B2OX -----END PGP SIGNATURE-----
