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    SubjectRe: A few filesystem benchmarks w/ReiserFS4 vs Other Filesystems
    Alexander Lyamin wrote:

    >Fri, Aug 27, 2004 at 05:45:41PM +0200, Bartlomiej Zolnierkiewicz wrote:
    >
    >
    >>Hi,
    >>
    >>
    >>>Execute rm -rf linux-2.6.8.1 on each file system.
    >>># -------------------------------------------------------------------- #
    >>>ext2 | 10.26 sec @ 22% cpu
    >>>ext3 | 10.02 sec @ 25% cpu
    >>> jfs | 26.67 sec @ 27% cpu
    >>> rs3 | 03.22 sec @ 74% cpu
    >>> rs4 | 25.58 sec @ 50% cpu <- What happened to reiserfs4 here?
    >>> xfs | 12.51 sec @ 47% cpu
    >>># -------------------------------------------------------------------- #
    >>>Create a 500MB file with dd to each filesystem with 1MB blocks.
    >>># -------------------------------------------------------------------- #
    >>>ext2 | 15.72 sec @ 26% cpu
    >>>ext3 | 17.04 sec @ 31% cpu
    >>> jfs | 29.57 sec @ 25% cpu
    >>> rs3 | 15.21 sec @ 27% cpu
    >>> rs4 | 23.96 sec @ 23% cpu <- What happened to reiserfs4 here?
    >>>
    >>>
    Do a dd of a 50GB file, I expect a completely different result.
    Basically, this is an artifact of reiser4 choosing to flush the whole
    file once it starts to flush.

    >>> xfs | 19.07 sec @ 29% cpu
    >>>
    >>>
    >
    >Your answers somewhere in HCH's "silent semantics" thread.
    >
    >Basically reiserfs team aware that they do suck at file DELETES
    >and OVERWRITES. There seem to be a way to rectify this perfomance
    >issues in future (dynamic repacker?). Altough i was somewhat surprised
    >with this dd file benchmark... probably Alexander Zarochentsev knows
    >the answer.
    >
    >

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