[Pspp-commits] [SCM] GNU PSPP branch, master, updated. v0.8.5-178-gac19665

[Ben Pfaff]

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- Log -----------------------------------------------------------------
commit ac196658f4fd578201d9feee087b02d95643b08e
Author: Ben Pfaff <address@hidden>
Date:   Sat Jul 25 08:58:06 2015 -0700

    dictionary: Make dict_delete_var() much faster in common case.
    
    When a system file is opened, dict_delete_consecutive_vars() deletes lots
    of variables if the system file has long string variables.  This was very
    slow because of the O(n**2) behavior in dict_delete_var().  The biggest
    cost of that O(n**2) behavior was in calling var_clone() on every variable
    several times.  Fortunately, the var_clone() call is not necessary in this
    case, because the cloned variable is only needed for callbacks, which
    aren't set when a dictionary is being read.
    
    This reduced the time to read the dictionary in a particular sample system
    file from seconds to milliseconds.

-----------------------------------------------------------------------

Summary of changes:
 src/data/dictionary.c |   16 ++++++++++------
 1 files changed, 10 insertions(+), 6 deletions(-)


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