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the new pthread_cond_wait function is slow when in multi core environment

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because of the queue. so we build old version function in an extra .so file.
you can use it by adding LD_PRELOAD=./libpthreadcond.so in front of your
program (eg: LD_PRELOAD=./libpthreadcond.so ./test).
use with-libpthreadcond to open the spec compile option.
This commit is contained in:
xuhuijie 2020-08-04 19:05:22 +08:00
parent b991e5dd47
commit 94a9b01b4e
2 changed files with 4967 additions and 1 deletions
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4935
build-extra-libpthreadcond-so.patch Normal file
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33
glibc.spec
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@ -31,6 +31,7 @@
%bcond_with bootstrap
%bcond_without werror
%bcond_without docs
%bcond_with libpthreadcond
%ifarch %{valgrind_arches}
%bcond_without valgrind
@ -59,7 +60,7 @@
##############################################################################
Name: glibc
Version: 2.31
Release: 3
Release: 4
Summary: The GNU libc libraries
License: %{all_license}
URL: http://www.gnu.org/software/glibc/
@ -92,6 +93,7 @@ Patch6013: Fix-CVE-2020-6096-002.patch
Patch6014: Disable-warnings-due-to-deprecated-libselinux-symbol.patch
Patch9000: delete-no-hard-link-to-avoid-all_language-package-to.patch
Patch9001: build-extra-libpthreadcond-so.patch
Provides: ldconfig rtld(GNU_HASH) bundled(gnulib)
@ -462,6 +464,15 @@ pushd $builddir
make %{?_smp_mflags} -O -r %{glibc_make_flags}
popd
##############################################################################
# Build libpthreadcond
##############################################################################
%if %{with libpthreadcond}
cd nptl_2_17
sh build_libpthreadcondso.sh %{_target_cpu} $builddir
cd ..
%endif
##############################################################################
# Install glibc...
##############################################################################
@ -477,6 +488,10 @@ done
make -j1 install_root=$RPM_BUILD_ROOT install -C build-%{target}
%if %{with libpthreadcond}
cp build-%{target}/nptl/libpthreadcond.so $RPM_BUILD_ROOT%{_libdir}
%endif
pushd build-%{target}
# notice: we can't use parallel compilation because the localedata will use "localedef" command
@ -712,6 +727,10 @@ for module in compat files dns; do
done
grep -e "libmemusage.so" -e "libpcprofile.so" master.filelist >> glibc.filelist
%if %{with libpthreadcond}
echo "%{_libdir}/libpthreadcond.so" >> glibc.filelist
%endif
##############################################################################
# glibc "common" sub-package
##############################################################################
@ -1168,6 +1187,18 @@ fi
%doc hesiod/README.hesiod
%changelog
* Fri Aug 14 2020 Xu Huijie<546391727@qq.com> - 2.31-4
- since the new version of the pthread_cond_wait()
function has performance degradation in multi-core
scenarios, here is an extra libpthreadcond.so using
old version of the function. you can use it by adding
LD_PRELOAD=./libpthreadcond.so in front of your program
(eg: LD_PRELOAD=./libpthreadcond.so ./test).
use with-libpthreadcond to compile it.
warning:2.17 version pthread_cond_wait() does not meet
the posix standard, you should pay attention when using
it.
* Fri Jul 24 2020 Wang Shuo<wangshuo_1994@foxmail.com> - 2.31-3
- backport patch to disable warnings due to deprecated libselinux
- symbols used by nss and nscd