Re: Unlimited threads being created
Alex.From.Ohio.Java@gmail.com wrote:
On Mar 18, 5:19 pm, Eric Sosman <Eric.Sos...@sun.com> wrote:
You could likely count them on your fingers;
taking your shoes off is probably unnecessary.
Eric! You are Sun guy! Open JConsole and look how many threads simple
application has! I never saw less then 20. Should I mention all of
them? :)
In the material you snipped, I made it clear that I was
referring to "hardware execution units," to "threads that
can execute simultaneously on the hardware." Some people
call these "strands" or "pipelines," but neither term seems
entirely satisfactory to me. What I was getting at was:
How many threads could possibly be in the act of executing
instructions at a given moment? This is not the same as:
How many threads could exist on the system and be eligible
to compete for the right to execute instructions?
The two notions -- "strands" and threads -- are different
and to some degree independent (the system's scheduler maintains
the illusion that all eligible threads run simultaneously, even
though there may be more threads than "strands"). However, it
is usually a sign that something is wrong if the number of
eligible threads vastly exceeds the number of "strands" that
can run them.
--
Eric Sosman
esosman@ieee-dot-org.invalid