New CELL Article Online

Article: CELL Microprocessor III
By: Deadmeat (deadmeatoa.delete@this.yahoo.com), August 5, 2005 12:10 pm
Room: Moderated Discussions
> 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 CPU thread is put to sleep after it kicks the APU. You need
individual CPU threads to kick individual APUs.(Single CPU thread
cannot kick more than one APU at a time)Thus you need to have 7 CPU
threads that have kicked 7 APUs and are sleeping to have all APUs
run at any given moment.

> The game process would use IPC to send a message/signal to the
> scheduler process.

That's not how CELL works.

> 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.

An APU is treated as an external synchronous I/O device. Reading from,
writing to, or kicking an APU is treated as a normal I/O operation and
the CPU thread that initiated that I/O operation is blocked until the
completion of that I/O operation, which reinstates that blocked CPU
thread to ready status. A signal will awaken a non-blocked thread, not
an I/O blocked thread.
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