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Re: Performance issue of libtool-2.4.4

From: Robert Yang
Subject: Re: Performance issue of libtool-2.4.4
Date: Fri, 6 Feb 2015 09:24:39 +0800
User-agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Thunderbird/31.3.0


After removing the two lines, libtool 2.4.5 is a little slower than 2.4.2
when using /bin/dash, but it is much slower than in bash, here is the
data when compile xz: (make -j1)

      lt-2.4.2  lt-2.4.5(before patched)  lt-2.4.5(after patched)
dash     11s          21s                    13s
bash     13s          30s                    21s

We can see that dash is much faster than bash. (note, the data I had reported
before for lt-2.4.5 after patched is 11s, but today is 13s, I think that
it is because of the free disk space, the data is very stable in each day,
I tried them several times).

// Robert

On 02/04/2015 10:56 PM, Robert Yang wrote:

On 02/04/2015 10:48 PM, Bob Friesenhahn wrote:
On Wed, 4 Feb 2015, Robert Yang wrote:

When reporting a bug, please describe a test case to reproduce it and
include the following information:

      host-triplet:   $host
      shell:          $SHELL
      compiler:       $LTCC
      compiler flags: $LTCFLAGS
      linker:         $LD (gnu? $with_gnu_ld)
      version:        $progname (GNU libtool) 2.4.5
      automake:       `($AUTOMAKE --version) 2>/dev/null |$SED 1q`
      autoconf:       `($AUTOCONF --version) 2>/dev/null |$SED 1q`

Perhaps libtool is accidentially executing 'automake --version' and 'autoconf
--version' every time it is executed?  That would certainly lead to a huge

Thanks, yes, you are right, after remove the two lines, the time is the
same as remove the whole block (11s).

// Robert



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