Why is a php cli process using 25% of CPU, is there a way to reduce this? Right now I'm running 3 instances but obviously I would like to run much more to finish the job faster.
Background info: I'm moving data from a transbase db to mysql db.
EDIT: If I run this in a browser there isn't such a noticeable load on the CPU.
分享 More processes doesn't mean faster processing. The PHP process takes as much CPU as it can to finisgh the task as quick as possible. It's probably 25% because you got a quad-core processor and it's a single threaded task.
Ideally, you would need 4 processes if you could assign each of them to a different code. Also, because of waiting for database or disk-I/O, a single thread cannot fully use all CPU power all the time, so go ahead and run more processes. It's not that a 5th processes will crash because all CPU power is used up; it will just take its share, while the OS divides processing power to all running processes.
Just dont' start too many; every process has a little overhead, and you won't benefit from having 200 simultaneous processes.
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