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Re^2: problem of my multithreading perl script

by sundialsvc4 (Abbot)
on Jan 11, 2013 at 17:39 UTC ( #1012935=note: print w/ replies, xml ) Need Help??


in reply to Re: problem of my multithreading perl script
in thread problem of my multithreading perl script

-- the same would be true for SSDs, though less so --
As an aside, I am quite intrigued by this comment.   At your convenience, I would like to know more of your insights with regard to this assertion, perhaps best moved to a separate thread.   I would intuit that such latencies could not exist with solid-state, although I do not dispute you; hence, “howcum?”


Comment on Re^2: problem of my multithreading perl script
Re^3: problem of my multithreading perl script
by BrowserUk (Pope) on Jan 11, 2013 at 19:17 UTC

    Take a look at an SSD review.

    Note how the random 4k reads achieves a relatively low throughput (101.4MB/s in that particular case), whereas the throughput for sequential reads is considerably higher (431.8MB/s).

    This is a common factor with all SSDs. Much faster than spinning rust, but it is still considerably faster to read a file sequentially than randomly.

    If you are reading 12 files sequentially, concurrently, you are reading 4K blocks randomly from the viewpoint of the controller.


    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.

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