07-16-2007
How many threads do I use ?
Hi,
I have a program that has two types of threads:
1) Reader threads
2) Worker Threads
Readers: Their only job is to read files. They just read data from the files and put them into a buffer. They are obviously I/O intensive.
Workers: These are CPU intensive. They do some computation on the data which has been put into these buffers.
How many threads:
1) Worker: I think this answer is obvious. The number of worker threads should be equal to the number of CPUs in the sytem.
2) Reader: What about these? How can I determine the capability of I/O system ?
Specifically, I want the user to be able to specify the number of Reader and Worker threads the would like the program to use.
QUESTION: What guidelines should the user follow or use to determing this number ? How can they determine the capabilities of the I/O subsystem?
(The program uses 1 reader and 4 worker threads by default)
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WORKER(3) 1 WORKER(3)
The Worker class
INTRODUCTION
Worker Threads have a persistent context, as such should be used over Threads in most cases.
When a Worker is started, the run method will be executed, but the Thread will not leave until one of the following conditions are met:
othe Worker goes out of scope (no more references remain)
othe programmer calls shutdown
othe script dies
This means the programmer can reuse the context throughout execution; placing objects on the stack of the Worker will cause the Worker to
execute the stacked objects run method.
Warning
The programmer must retain references to stacked objects until they are executed or unstacked; the Pool class provides a higher
level abstraction of the Worker functionality and manages references for the programmer.
CLASS SYNOPSIS
Worker
Workerextends
ThreadTraversableCountableArrayAccess
Methods
o public integer Worker::getStacked (void )
o public boolean Worker::isShutdown (void )
o public boolean Worker::isWorking (void )
o public boolean Worker::shutdown (void )
o public integer Worker::stack (Threaded &$work)
o public integer Worker::unstack ([Threaded &$work])
Inherited methods
o public void Thread::detach (void )
o public integer Thread::getCreatorId (void )
o publicstatic Thread Thread::getCurrentThread (void )
o publicstatic integer Thread::getCurrentThreadId (void )
o public integer Thread::getThreadId (void )
o publicstatic mixed Thread::globally (void )
o public boolean Thread::isJoined (void )
o public boolean Thread::isStarted (void )
o public boolean Thread::join (void )
o public void Thread::kill (void )
o public boolean Thread::start ([integer $options])
PHP Documentation Group WORKER(3)