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6781: [MUD-Dev] Re: lurker emerges
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From: Petri Virkkula <pvirkkul@iki.fi>
Newsgroups: nu.kanga.list.mud-dev
Date: Sun, 9 Aug 1998 22:39:54 +0300 (EEST)
References: [1]
Organization: Kanga.Nu
>>>>> "Chris" == Chris Gray <cg@ami-cg.GraySage.Edmonton.AB.CA> writes:
Chris> In general, I think its clear that threading will only actually increase
Chris> your speed if your system has multiple CPUs. You may well choose to use
That's only true if your program is CPU bound. If the program
is I/O bound then count of physical disks is more relevaant
factor. In a mixed case I would use (this is only a guess)
x+2*y as formula for optimal thread count (x is count of CPUs
and y is count of physical disks), count of physical disks are
multiplied with 2 to keep disks busy all the time.
Chris> threading for other reasons (e.g. on WIN32 you often have no choice).
Chris> Threading has overhead over non-threading, and there isn't anything you
Chris> can do about that.
Don't forget that non-threading has overhead too: if there is
multiple file descriptors then select'ing and going through
fd_sets can burns CPU time too.
Petri