Since 18.04 and 20.04 problem has dissappeared. 16.04 is close to end of
live, so I suggest closing this bug as obsolete.
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https://bugs.launchpad.net/bugs/1613996
Title:
30% slowdown
This is most likely the same bug as
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1663280
Can you confirm that the problem goes away if you run the dynamically linked
binary with the environment variable LD_BIND_NOW=1?
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Performance drop workaround: using static compiler and linker flags
When compiling the solver with CXXFLAGS -static-libgcc -static-libstdc++
-static the solver is now slightly faster on Ubuntu 16.04 than with
Ubuntu 14.04. The issue appears to be related to dynamic linking of the
runtime
** Description changed:
I noticed that a numerical solver I develop runs much slower on 16.04.1
- than on 14.04. See for example this output:
+ than on 14.04.
- The counters (top part of each result section) show that the solver does
- the same on both variants. The timings (lower part,
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: glibc (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1613996
Title:
30%
** Package changed: ubuntu => gcc
** Also affects: glibc (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1613996
Title:
30% slowdown in numerical
ldd ./DelphinSolver gives:
linux-vdso.so.1 => (0x7ffdc833d000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6
(0x7fbe9eee9000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x7fbe9ebe)
libgcc_s.so.1 =>
Thank you for taking the time to report this bug and helping to make
Ubuntu better. It seems that your bug report is not filed about a
specific source package though, rather it is just filed against Ubuntu
in general. It is important that bug reports be filed about source
packages so that people
