parallelize php with exec( )

Question

I want to parallelize a php program which I use to read some .xml. I've been googleing and I read about some options:

fork
curl
gearman
exec

I also red that exec is the best, but I don´t understand how it works. Anyone who can explain it?

Thanks in advance.

Read the manual for each one and determine which one best suits your needs... — Nick Pickering
– Nick Pickering, Commented Feb 24, 2013 at 12:31
exec doesn't parallelize anything because it waits for the spawned process to exit before returning. — Jon
– Jon, Commented Feb 24, 2013 at 13:10

Oswald · Accepted Answer · 2013-02-24 13:29:12Z

2

exec doesn't parallelize. It waits for processing to finish before returning. curl can parallelize using curl_multi_init() and curl_multi_exec(). fork is pretty low level. I don't know gearman, I've only read the Basic usage example, so I cannot tell you anything about it.

edited Feb 24, 2013 at 13:29

answered Feb 24, 2013 at 13:10

Oswald

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4 Comments

Jon Over a year ago

curl can parallelize.

tmuguet Over a year ago

exec can run background processes (see php.net/manual/en/function.exec.php#Hcom86329). It can be considered as parallelizing...

Eneko Over a year ago

I have been trying to install gearman on my macbook for two hours, but I could'nt. I've tried compiling it myself and installing it with homebrew, but nothing. The thing that annoyes me is that the installation progress looks correct but when I want to run my gearman server (% gearmand -d), the shell outputs 'command not found'. I think I'll try parallelizing with exec() but I don't know how to do it. If someone could give me a short explanation or a link to a good tutorial or examples, that would be great! thanks in advance.

Oswald Over a year ago

@tmuguet In your link, it's not exec, that does the parallelization. It's the command processor. This is not portable, exec is not even used on MS-Windows. Moreover, there is no way to capture the output of the program, let alone the execution result. Reason enough for me, to not attribute parallelization to exec.

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