Date: Wed, 28 Feb 2001 14:07:49 +0100 From: Anton Berezin <tobez@tobez.org> To: hackers@freebsd.org Subject: how to actually find out whether data hit the disk? Message-ID: <20010228140749.B29400@heechee.tobez.org>
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Hi,
I am doing the following, on the partition with softupdates turned on:
1. fd = open("a file", O_CREAT)
2. mmap(fd)
3. sequencial write to mmapped region
4. some other processing
5. munmap
6. unlink
7. close
Since this is a supposedly high-perfomance application, I am interested
that data do NOT hit the disk. I understand that softupdates do a good
job at that. The time taken by step 4 is usually sub-second, but
sometimes it can take longer (network delays etc.). The question is -
is it possible to actually find out whether data hit the disk or not for
a particular run of 1-7?
&Anton.
--
May the tuna salad be with you.
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