Hello Gustavo, or anyone else affected, Accepted coreutils into yakkety-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/coreutils/8.25-2ubuntu3~16.10 in a few hours, and then in the -proposed repository.
Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed.Your feedback will aid us getting this update out to other Ubuntu users. If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision. Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance! ** Changed in: coreutils (Ubuntu Yakkety) Status: New => Fix Committed ** Tags added: verification-needed ** Changed in: coreutils (Ubuntu Xenial) Status: New => Fix Committed -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to coreutils in Ubuntu. https://bugs.launchpad.net/bugs/1667407 Title: improve 2x-3x sha256sum performance on ppc64le due to current gcc optimization bug Status in coreutils package in Ubuntu: Fix Released Status in coreutils source package in Xenial: Fix Committed Status in coreutils source package in Yakkety: Fix Committed Status in coreutils package in Debian: Fix Released Bug description: [Impact] * Performance drop of 2x-3x on ppc64le when using sha256sum * Please backport this bug to last LTS as this application is widely used. * This fix is due to a optimization issue found on gcc v4.9 to gcc v7.0. [Test Case] * Run sha256sum with a big file and measure the time it takes. The patch improves this timing up to 3 times faster. [Regression Potential] * This patch is specifically for the sha256.o object, affecting only this binary. [Other Info] Michael Stone's improved patch: Index: coreutils-8.26/Makefile.in =================================================================== --- coreutils-8.26.orig/Makefile.in 2016-11-30 13:34:55.000000000 -0500 +++ coreutils-8.26/Makefile.in 2017-02-22 07:18:55.352394058 -0500 @@ -14661,6 +14661,10 @@ $(TEST_LOGS): $(PROGRAMS) +ifeq ($(DEB_TARGET_ARCH), ppc64el) +lib/sha256.o: CFLAGS+=-fno-schedule-insns +endif + # Tell versions [3.59,3.63) of GNU make to not export all variables. # Otherwise a system limit (for SysV at least) may be exceeded. .NOEXPORT: Original bug description: The sha256sum provided by coreutils (without openssl) is performing poorly with gcc versions >= 4.9 until 7.0 (currently under development). The reason for that is the -fschedule-insns optimization that is used with -O2. By simply deactivating it, there is a performance improvement of 2 to 3 times. I'm using Ubuntu 16.10 and the coreutils package version 8.25-2ubuntu2. Please check the following closed debian bug report: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854053 Be aware of the following conditions that are required: * If ppc64le * If gcc being used is >= 4.9 and < 7.0 Notes: 1) gcc-7 is not affected by this bug (verified on 20170129 snapshot). 2) clang is not affected by this bug (verified on v3.8 and v3.9). 3) strangely the sha512 is not affected by this. Below a demonstration of how it performs on my POWER8 machine: =================================================== $ (./configure && make -j9) > /dev/null && time src/sha256sum ~/ubuntu-16.10-server-ppc64el.iso configure: WARNING: libacl development library was not found or not usable. configure: WARNING: GNU coreutils will be built without ACL support. configure: WARNING: libattr development library was not found or not usable. configure: WARNING: GNU coreutils will be built without xattr support. configure: WARNING: libcap library was not found or not usable. configure: WARNING: GNU coreutils will be built without capability support. configure: WARNING: libgmp development library was not found or not usable. configure: WARNING: GNU coreutils will be built without GMP support. src/who.c: In function 'print_user': src/who.c:454:20: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers] int *a = utmp_ent->ut_addr_v6; ^~~~~~~~ d14bdb413ea6cdc8d9354fcbc37a834b7de0c23f992deb0c6764d0fd5d65408e /home/gut/ubuntu-16.10-server-ppc64el.iso real 0m18.670s user 0m16.566s sys 0m0.745s $ # now with the following patch: ## Check Michael Stone's patch for an improved version. $ diff Makefile.in ../Makefile.in 8989c8989 < @am__fastdepCC_TRUE@ $(COMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ $< &&\ --- > @am__fastdepCC_TRUE@ $(COMPILE) $$([ "$@" == "lib/sha256.o" ] && echo "-fno-schedule-insns") -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ $< &&\ $ cp ../Makefile.in Makefile.in $ (./configure && make -j9) > /dev/null && time src/sha256sum ~/ubuntu-16.10-server-ppc64el.iso configure: WARNING: libacl development library was not found or not usable. configure: WARNING: GNU coreutils will be built without ACL support. configure: WARNING: libattr development library was not found or not usable. configure: WARNING: GNU coreutils will be built without xattr support. configure: WARNING: libcap library was not found or not usable. configure: WARNING: GNU coreutils will be built without capability support. configure: WARNING: libgmp development library was not found or not usable. configure: WARNING: GNU coreutils will be built without GMP support. src/who.c: In function 'print_user': src/who.c:454:20: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers] int *a = utmp_ent->ut_addr_v6; ^~~~~~~~ d14bdb413ea6cdc8d9354fcbc37a834b7de0c23f992deb0c6764d0fd5d65408e /home/gut/ubuntu-16.10-server-ppc64el.iso real 0m5.903s user 0m5.560s sys 0m0.255s To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/coreutils/+bug/1667407/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
