[Octave-bug-tracker] [bug #37509] `load -z` is very slow

[Jordi Gutiérrez Hermoso]

Update of bug #37509 (project octave):

                  Status:                    None => Confirmed              

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Follow-up Comment #4:

I suspect this cset is to blame:

http://hg.savannah.gnu.org/hgweb/octave/rev/980e2d5c83f7

Indeed, on 3.6.2 we do not see this problem. The issue seems to be that that
istream::tellg call ends up in gzfilebuf::seekoff:

http://hg.savannah.gnu.org/hgweb/octave/file/d174210ce1ec/src/zfstream.cc#l462

which is calling gzseek thousands of times, which is acknowledged to be
extremely slow:

http://library.developer.nokia.com/topic/S60_3rd_Edition_Cpp_Developers_Library/GUID-2AD4ABC3-4061-4698-AF45-1DEC83466E64/html/zlib-gzseek-1.html

http://www.gzip.org/zlib/manual.html#gzseek

since this is a confirmed regression, we should fix this before the 3.6.4
release.

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