New CELL Article Online

Article: CELL Microprocessor III
By: john evans (none.delete@this.given.com), August 4, 2005 7:30 pm
Room: Moderated Discussions
Deadmeat (deadmeatoa@yahoo.com) on 8/4/05 wrote:
---------------------------

>
>Because only one CPU thread can access one APU at a time(the moment the CPU thread
>kicks the APU, it is immediately preempted from the running queue and put to sleep/wait
>until the APU execution is over), so you need to have 7 CPU threads that have issued
>a job to an APU each to utilize all seven at any given moment.
>

That makes no sense. You would need at most two processes,
by my estimation: one for the game, and another to manage
the APU kick stuff.

The game process would use IPC to send a message/signal
to the scheduler process. And if there's a free APU, the
scheduler kicks it off right away, otherwise it queues.

In other words, just because a process is waiting on one I/O
event, that doesn't mean it can't be awoken by another
asynchronous, unrequested event, like a signal.

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