September 2013
Intermediate to advanced
548 pages
12h 25m
English
Content preview from Programming Erlang, 2nd Edition
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The Importance of Partitioning the Data
I’ll let you in on a secret now. Partitioning the data is the key
to parallelizing the program. process_all_years(), which
we used to build the data store, is defined like this:
| | process_all_years() -> |
| | [process_year(I) || I <- mail_years()]. |
process_year(Year) processes all the data for a
specific year, and mail_years/0 returns a list of years.
To parallelize the program, all you have to do is change the
definition of process_all_years and call pmap,
which we talked about in Parallelizing Sequential Code. With this
small change, our function looks like this:
| | process_all_years() -> |
| | lib_misc:pmap(fun(I) -> process_year(I) end, mail_years()). |
There is an additional and less obvious benefit. ...
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