[Swift-user] What system calls do the mappers use?

[Michael Wilde]

Lorenzo,

All Swift arrays are varying in size: you dont declare the array size in the declaration. Further, they can be sparse (because the implementation is in fact a hashtable).

Swift has code that supports user-level hashes by by declaring arrays with string instead of integer keys. I thought this made it to the User Guide but I see now that it did not. Its possible/likely thats because the code is not in trunk yet.

Can anyone on the devel team reply with the status of associative arrays?

Thanks,

- Mike

----- Original Message -----
> From: "Lorenzo Pesce" <lpesce at uchicago.edu>
> To: "Michael Wilde" <wilde at mcs.anl.gov>
> Cc: "Swift User Discussion List" <swift-user at ci.uchicago.edu>
> Sent: Wednesday, March 20, 2013 3:43:19 PM
> Subject: Re: [Swift-user] What system calls do the mappers use?
> 
> Can one make hashes of arrays in or arrays of arrays of different
> sizes in swift?
> e.g., and array of an array type of variable size?
> 
> On Mar 20, 2013, at 3:41 PM, Michael Wilde wrote:
> 
> > 
> > Also, to answer your question more directly: "I dont know".  You
> > can try to answer this by writing some very simple swift scripts
> > that do the kinds of built-in mappings you are looking at, and use
> > strace() wuth suitable filtering and grepping do see what Swift
> > (via Java) is doing to implement the mapping.
> > 
> > Mihael may be able to point you to the Java classes that do the
> > mapping to distill this process further.
> > 
> > - Mike
> > 
> > 
> > ----- Original Message -----
> >> From: "Lorenzo Pesce" <lpesce at uchicago.edu>
> >> To: "Swift User Discussion List" <swift-user at ci.uchicago.edu>
> >> Sent: Wednesday, March 20, 2013 3:27:05 PM
> >> Subject: [Swift-user] What system calls do the mappers use?
> >> 
> >> Hi --
> >> 
> >> I am working with mappers that might be repeated thousands of
> >> times
> >> in each workflow run.
> >> Lustre doesn't like that type of search when it is based on
> >> approaches similar to "ls", on the other hand "find" works fine.
> >> 
> >> I could conceivably find a work around, but I would rather not
> >> have
> >> to do it.
> >> 
> >> Lorenzo
> >> _______________________________________________
> >> Swift-user mailing list
> >> Swift-user at ci.uchicago.edu
> >> https://lists.ci.uchicago.edu/cgi-bin/mailman/listinfo/swift-user
> >> 
> 
>