On 2017-10-15 20:53, Eduardo A. Bustamante López wrote: > I have some questions: > > 1. Which specific versions of 4.3 and 4.4? > 2. Did you compile bash from source? (if so, what did you use for CFLAGS and > the configure script parameters? are you > using bash's malloc or the system malloc?) > 3. ... Or did you use a distro package? (if so, can you provide links to the > specific packages used?)
I was testing with the openSUSE Tumbleweed packages, which is probably compiled with -O2 and pretty standard configure options: https://build.opensuse.org/package/view_file/openSUSE:Factory/bash/bash.spec around line 429 > 4. Do you have precise timing information? How specifically did you test? How > many iterations? etc I used the reproducer script in my previous email, containing two similar functions (one short, one long) that both do nothing in a loop with N=30000 and was comparing the timing of those two on the same bash version. e.g. for bash-4.3 on a 2.80GHz Core i7 I get real 0m0.271s user 0m0.270s sys 0m0.003s real 0m0.482s user 0m0.483s sys 0m0.000s interestingly, the number of colons has a much larger impact on runtime than the number of spaces. Thanks for looking into that.
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