In article <200101152033.f0FKXpv250839@saturn.cs.uml.edu>,
Albert D. Cahalan <acahalan@cs.uml.edu> wrote:
>Ingo Molnar writes:
>> On Mon, 15 Jan 2001, Jonathan Thackray wrote:
>
>>> It's a very useful system call and makes file serving much more
>>> scalable, and I'm glad that most Un*xes now have support for it
>>> (Linux, FreeBSD, HP-UX, AIX, Tru64). The next cool feature to add to
>>> Linux is sendpath(), which does the open() before the sendfile() all
>>> combined into one system call.
>
>Ingo Molnar's data in a nice table:
>
>open/close 7.5756 microseconds
>stat 5.4864 microseconds
>write 0.9614 microseconds
>read 1.1420 microseconds
>syscall 0.6349 microseconds
>
>Rather than combining open() with sendfile(), it could be combined
>with stat().
Note that "fstat()" is fairly low-overhead (unlike "stat()" it obviously
doesn't have to parse the name again), so "open+fstat" is quite fine
as-is.
Linus
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This archive was generated by hypermail 2b29 : Mon Jan 15 2001 - 21:00:41 EST