On 2015/7/13 18:43, Cyril Hrubis wrote:
> Hi!
>> I used ltp to test my linux OS.Sometimes, I get "fsync took too long"
>> error.Then I read fsync02 description -- Create a sparse file, fsync it,
>> and time the fsync, but I don't know what is the purpose to do this, Any
>> ideas or pointers would be greatly appreciated.
>
> Looks like the testcase tries to assert that fsync() finishes in
> reasonable time. Which is 120 seconds and if I'm right the amout of data
> it writes to the file is about 8MB and that seems to be fairly
> reasonable unless you system is under heavy load.
>
> One of the problems may be that it uses BUFSIZ for the size of the
> buffer, which is defined in my glibc to 8192, if that constant is
> defined substantially larger on your system the test may easily fail.
>
Hi, Cyril:
If this testcase is only to test whether fsync() finishes in a
reasonable time, just calls fsync() is enough. Why there needs a sparse
file? And why this reasonable time is 120 seconds?
Thanks
--
Rock Lee
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