From owner-freebsd-questions  Tue Oct 30  1:56: 4 2001
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Date: Tue, 30 Oct 2001 11:55:51 +0200
From: Mihai Chelaru <mihai@romtelenet.org>
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Hello,

I have a problem using freebsd pthreads. After i launch a number of
aprox. 10000 threads (not concomitent but in a period of 1 day) the
process suddenly goes up to 99% of CPU. i did a truss on that process
and look what i got:

gettimeofday(0x28125188,0x0)                     = 0 (0x0)
poll(0x8070000,0x4,0x253a)                       = 1 (0x1)
gettimeofday(0x28125188,0x0)                     = 0 (0x0)
poll(0x8070000,0x4,0x253a)                       = 1 (0x1)
gettimeofday(0x28125188,0x0)                     = 0 (0x0)
poll(0x8070000,0x4,0x253a)                       = 1 (0x1)
gettimeofday(0x28125188,0x0)                     = 0 (0x0)
poll(0x8070000,0x4,0x2538)                       = 1 (0x1)
gettimeofday(0x28125188,0x0)                     = 0 (0x0)
poll(0x8070000,0x4,0x2537)                       = 1 (0x1)
gettimeofday(0x28125188,0x0)                     = 0 (0x0)
poll(0x8070000,0x4,0x2537)                       = 1 (0x1)
gettimeofday(0x28125188,0x0)                     = 0 (0x0)
poll(0x8070000,0x4,0x2537)                       = 1 (0x1)
gettimeofday(0x28125188,0x0)                     = 0 (0x0)
poll(0x8070000,0x4,0x2537)                       = 1 (0x1)
gettimeofday(0x28125188,0x0)                     = 0 (0x0)
poll(0x8070000,0x4,0x2536)                       = 1 (0x1)
gettimeofday(0x28125188,0x0)                     = 0 (0x0)
poll(0x8070000,0x4,0x2536)                       = 1 (0x1)
gettimeofday(0x28125188,0x0)                     = 0 (0x0)
poll(0x8070000,0x4,0x2536)                       = 1 (0x1)
gettimeofday(0x28125188,0x0)                     = 0 (0x0)
poll(0x8070000,0x4,0x2535)                       = 1 (0x1)

First i thought the problem was in my program but after a couple of days
i saw that mysql entered the same loop. I tested this on i386
architecture (single and multiprocessor machines) with FreeBSD 4.3 and
4.4.
Any ideas ?

Thank you,
Mihai Chelaru




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