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SubjectRe: > 15,000 Simultaneous Connections
On Thu, 9 Sep 1999, Jason Nordwick wrote:
> Hmmm... let me thing about this over the weekend. You have just given me
> a few ideas (good or bad, I don't know, yet). There are some good papers
> on implementing sets (the mathematical kind) efficiently.
>
> Some people have done similar things: one of Gaurav (the USENIX99 paper
> author about event queues) other ideas was to use use a two level bitmap
> for file descriptor allocation. This two level bitmap is very common in
> many other application (actually, where I work, Ask Jeeves, we use it
> to maintain a list of matching questions). I think that there are many
> other ideas that can be transplanted here.

we've implemented the double-level bitmap technique for allocating file
descriptors. see the URL below for more info.

i was just getting ready to port it to late 2.3 to find out if it relieves
the contention in get_unused_fd and do_close on files->file_lock.

- Chuck Lever
--
corporate: <chuckl@netscape.com>
personal: <chucklever@netscape.net> or <cel@monkey.org>

The Linux Scalability project:
http://www.citi.umich.edu/projects/linux-scalability/


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