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Re: time cost for file reading increasing!!! same file! [message #69747 is a reply to message #69746] Mon, 08 February 2010 18:00 Go to previous messageGo to previous message
wlandsman is currently offline  wlandsman
Messages: 743
Registered: June 2000
Senior Member
On Feb 8, 6:20 pm, minchen <mchen...@gmail.com> wrote:
> Hi everyone,
> I meet a mysterious problem on IDL file reading.
> The problem is as following:
> I just read the same hdf5 file seveal times and see the time costing.
> I find the first 270 file reading is very quickly but after that, the
> reading speed drops down although the file is the same one.

I am reaching here, but maybe the problem is similar to one discussed
in an earlier thread ( http://tinyurl.com/yzrvd96 ) where the correct
question should be "Why is the file reading so fast to start
with?" Those fast times are deceptive because the IDL thinks the I/
O operation is complete after it has passed the data to the memory
cache, but the OS has not yet written the data to disk. Once the
memory cache fills, then IDL has to wait until the data is written to
the mechanical disk, but those longer times are a better measure of
the time to write the data to disk.

--Wayne

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