- linaro-toolchain - lists.linaro.org

by Zhenqiang Chen

Summary: * Identify the root cause of performance regression for the "split2" patch. * Validate Linaro binary toolchain prerelease. Details: 1. Identify the root cause of performance regression for the "split2" patch. * Code alignment is the root cause for the performance regression (Michael reproduced it with "__attribute__ ((aligned(16)))"). * "build-id" section is the root cause of result difference from cbuild test (the additional section makes the function address different). * Workout a small case to show the impact of code alignment on performance. 2. Linaro binary toolchain 2012.08 prerelease validation. All tests pass. Absence: * Annual leave: Aug. 24. Plans: * Linaro binary toolchain 2012.08 release. * Start shink-wrap work. Best regards! -Zhenqiang

13 years, 8 months

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LTO for the kernel

by Christian Robottom Reis

In case nobody here caught it: https://lwn.net/Articles/512548/ Interesting? Worth talking to Andi about it for ARM? -- Christian Robottom Reis | [+55 16] 3376 0125 | http://async.com.br/~kiko Async Open Source | [+55 16] 9112 6430 | http://launchpad.net/~kiko

13 years, 8 months

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[ACTIVITY] Aug 21-Aug 24

by Christophe Lyon

== Progress == * Fixed problems with my patch for "constant vec permute operation for the vext instruction" blue-print, validated in cbuild. * Ported it to trunk and submitted for review. R.Earnshaw requested validation on big-endian. I need to upgrade my qemu to have it supported. * Compiled my Neon intrinsics testsuite with LLVM (version 3.2 trunk 160543). It compiles at O0/O1/O2/O3, but only O0 produces the expected results. Errors include: vset_lane, vld3, and vld4. * Started looking a bswap16 support == Next == * Have my "constant vec permute operation for the vext instruction" patch accepted on trunk * Continue with bswap16 support.

13 years, 8 months

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[ACTIVITY] 20 August - 24 August

by Matthew Gretton-Dann

== Progress == * Follow up from 2012.08 Toolchain release * Updated Wiki pages * Start working on symbol_ref split benchmarking. * Backport to PR54212 done upstream to 4.6 and 4.7 * Started picking up Hot/Cold partitioning in PGO blueprint: * https://blueprints.launchpad.net/gcc-linaro/+spec/hot-cold-partitioning-in-… * Got SPEC running locally and I think I have reproduced Ramana's failures. == Next Week == * Bank Holiday on Monday * Investiagte SPEC failures in Hot/Cold PGO * Get symbol_ref benchmarking going properly == Future == * Look at Cards for Vectorization, PGO and LTO with Michael. -- Matthew Gretton-Dann Linaro Toolchain Working Group matthew.gretton-dann(a)linaro.org

13 years, 8 months

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Testing builds via cbuild

by Michael Hope

(cc'd to linaro-toolchain to archive) Hi Matt. I've had a look at the manual builds you tried to spawn. Here's what I did to run cbuild locally to test it: * cd linaro * bzr branch lp:cbuild * cd cbuild/slaves * cp -a example `hostname` * cd `hostname` * make -f ../../lib/build.mk final/gcc-4.8+svn190558.stamp I'm not proud of the whole 'slaves/$hostname' setup, but it is what it is. Results are in $version, such as gcc-4.8+svn190558. The build tree is in $version/gcc/default/build. Nuke using rm -rf final results $version. See lib/common.mk and override the email address etc in local.mk to stop build results going out You should put a proxy in $http_proxy or ~/.wgetrc to reduce the download cost. Please add to the cbuild README. A nit: we use the Debian versioning scheme so the version should be 4.8~svn190558, i.e. a SVN checkout leading up to 4.8. Compare with 4.7+svn1234, which is a SVN checkout of the 4.7 branch. The tarballs look generally good. I've spawned them into the a9hf queue as that's what we benchmark on. Note that they're low priority due to not having 'linaro' in the name. -- Michael

13 years, 8 months

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Function alignment and benchmark results

by Michael Hope

Zhenqiang's been working on the later split 2 patch which causes more constants to be built using a movw/movt instead of a constant pool load. There was an unexpected ~10 % regression in one benchmark which seems to be due to function alignment. I think we've tracked down the reason but not the action. Compared to the baseline, the split2 branch took 113 % of the time to run, i.e. 13 % longer. Adding an explicit 16 byte alignment to the function changed this to 97 % of the time, i.e. 3 % faster. The reason Zhenqiang and I got different results was the build-id. He used the binary build scripts to make the cross compiler, which turn on the build ID, which added an extra 20 bytes ahead of .text, which happened to align the function to 16 bytes. cbuild doesn't use the build-id (although it should) which happened to align the function to an 8 byte boundary. The disassembly is identical so I assume the regression is cache or fast loop related. I'm not sure what to do, so let's talk about this at the next performance call. -- Michael

13 years, 8 months

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Actions from Toolchain Performance Call 21 August 2012

by Matthew Gretton-Dann

All, I have updated the minutes from today's Performance Call here: https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2012-08-21 The following are the actions from the meeting: * michaelh to folow-up and ping Mans on getting a hold of his benchmark runs * michaelh to investigate regression with movw/movt patch by hand * mgrettondann to run current symbol ref splitting patch over SPEC against FSF trunk * michaelh to point mgrettondann to existing cards * michaelh and mgrettondann to start writing card for PGO work * mgrettondann to pick up Hot/Cold Partitioning patch from ramana, cross-test against SPEC for correctness, and then do a benchmarking run * ramana to create a Blueprint for min-idion in middle-end and update Todo list with link * mgrettondann to update todo list with changes in 2012.08 release. * zchen to work on shrink-wrapping * clyon to update his vext patch The next meeting is on 4 September and a proposed Agenda is here: https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2012-09-04 Please add any items you wish to discuss to the agenda. Thanks, Matt -- Matthew Gretton-Dann Linaro Toolchain Working Group matthew.gretton-dann(a)linaro.org

13 years, 8 months

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Re: [Linaro-toolchain-builds] [cbuild] eglibc-2.16~svn20181 armv7l failed

by Michael Hope

On 18 August 2012 12:06, Ramana Radhakrishnan <ramana.radhakrishnan(a)linaro.org> wrote: > This should have been fixed by this patch . I'm a bit surprised that > we are seeing these failures still ? > > ../ports/sysdeps/unix/sysv/linux/arm/ldsodefs.h:41:0: warning: > "MORE_ELF_HEADER_DATA" redefined [enabled by default] > > http://permalink.gmane.org/gmane.comp.lib.glibc.ports/1428 > > which should have made it back to eglibc 2.16 ? Well, that's embarrassing. The eglibc script is used to both build eglibc and to use a fixed eglibc to test GCC. The latter was winning so every snapshot build was actually building eglibc 2.12. Fixed and testing, -- Michael

13 years, 8 months

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[ACTIVITY] report week 33

by Peter Maydell

Current Milestones: || || Planned || Estimate || Actual || ||cp15-rework || 2012-01-06 || 2012-06-23 || 2012-06-24 || ||a15-lpae-support || 2012-07-13 || 2012-07-20 || 2012-07-20 || ||clean-up-kvm-patches || || || || ||track-kvm-abi-changes || || || || ||fake-trustzone || || || || == clean-up-kvm-patches == * started on driving "read/write cp15 regs from kernel" from the existing QEMU hashtable of cp regs it knows about. First cut seems to work, but needs more testing and also qemu's ARMCPRegInfo struct needs to provide raw_read/write methods which bypass access permission and similar checks. == other == * shepherded various things into upstream QEMU for 1.2 release freeze: arm-devs patch queue, linux-user patches, some minor stuff * qemu-linaro 2012.08 released * travel booked for Connect/ELC-E/KVM Forum; rest is blocked on the Connect conference hotel discount rate/booking info appearing KVM blueprint progress tracker: http://apus.seabright.co.nz/helpers/backlog?group_by=topic&colour_by=state&… -- PMM

13 years, 9 months

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[ANNOUNCE] Linaro GCC 4.7 and 4.6 2012.08 released

by Michael Hope

The Linaro Toolchain Working Group is pleased to announce the 2012.08 release of both Linaro GCC 4.7 and Linaro GCC 4.6. Linaro GCC 4.7 2012.08 is the fifth release in the 4.7 series. Based off the latest GCC 4.7.1+svn189992 release, it includes many ARM-focused performance improvements and bug fixes. Interesting changes include: * Updates to GCC 4.7.1+svn189992 * An ABI fix for vectors with the wrong layout * Backports improvements to the NEON vdup instruction with immediates * Backports a fix to performance regressions in partial redundancy elimination at high optimisation * Backports faster 64 bit core register adds with immediates A bug has been fixed in GCC's implementation of the AAPCS rules for the layout of vectors that could lead to wrong code being generated. Vectors larger than 8 bytes in size are now by default aligned to an 8-byte boundary. This is an ABI change: code that makes explicit use of vector types may be incompatible with binary objects built with older versions of GCC. Auto-vectorized code is not affected by this change. Fixes: * LP: #1020601 Strange behaviour with __builtin_unreachable() * PR38785 huge performance regression on EEMBC bitmnp01 * PR53447 missed optimization of 64bit ALU operation with small constant Linaro GCC 4.6 2012.08 is the eighteenth release in the 4.6 series. Based off the latest GCC 4.6.3+svn189991 release, this is the fifth release after entering maintenance. Interesting changes include: * Updates to 4.6.3+svn189991 * An ABI fix for vectors with the wrong layout The source tarballs are available from: https://launchpad.net/gcc-linaro/+milestone/4.7-2012.08 https://launchpad.net/gcc-linaro/+milestone/4.6-2012.08 Downloads are available from the Linaro GCC page on Launchpad: https://launchpad.net/gcc-linaro More information on the features and issues are available from the release page: https://launchpad.net/gcc-linaro/4.7/4.7-2012.08 Mailing list: http://lists.linaro.org/mailman/listinfo/linaro-toolchain Bugs: https://bugs.launchpad.net/gcc-linaro/ Questions? https://ask.linaro.org/ Interested in commercial support? Inquire at support(a)linaro.org -- Michael

13 years, 9 months

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[ACTIVITY] Aug 13-Aug 17

by Christophe Lyon

== Progress == * Out of office Friday 17 * Attended Virtual Connect sessions: * Vectorization * PGO/LTO: provided benchmarking results on Webkit computed in ST last year. * At last managed to have bzr working * Prepared a patch for "constant vec permute operation for the vext instruction" blue-print, based on linaro-gcc/4.7 * Some pending internal work == Next week == * Out of office Monday 20 * Check reviews for my patch to have it accepted.

13 years, 9 months

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PGO and LTO session preparation

by Michael Hope

Hi Matt. I've fleshed out the Etherpad for the PGO and LTO session at: http://pad.linaro.org/GzRj35tXFt It's a topic list that needs some specifics. Could you make sure we have basic answers to any correctness or performance questions? Ramana, could you add the specifics from the performance call? I can't seem to find the right meeting in the logs. -- Michael

13 years, 9 months

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[ACTIVITY] Aug 13 - Aug 17

by Matthew Gretton-Dann

== Progress == * Out of office Friday 17 * Attended Virtual Connect sessions * Vectorization * Ran PGO/LTO session * Lurked on AArch64/OpenEmbedded and Dalvik Performance sessions * Did the 2012.08 release of the Toolchain * Ran into infrastructure problems with armv5 builds * Most of the build process is now done * Start working on symbol_ref split benchmarking. * Struggled to get my jobs to spawn * Started to backport Ramana's fix to PR54212 * Submitted merge request for 4.7 backport == Next Week == * Ensure 2012.08 release is completed * Get symbol_ref benchmarking going properly * Complete backports of PR54212 * Follow up to Virtual Connect Sessions == Future == * Get my name against some blue-prints * Find a small patch to GCC to use to pipeclean the submission process -- Matthew Gretton-Dann Linaro Toolchain Working Group matthew.gretton-dann(a)linaro.org

13 years, 9 months

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[ANNOUNCE] Linaro QEMU 2012.08 released

by Peter Maydell

The Linaro Toolchain Working Group is pleased to announce the release of Linaro QEMU 2012.08. Linaro QEMU 2012.08 is the latest monthly release of qemu-linaro. Based off upstream (trunk) QEMU, it includes a number of ARM-focused bug fixes and enhancements. There are no major changes in this month's release, though it has been updated to track the latest upstream QEMU changes. The source tarball is available at: https://launchpad.net/qemu-linaro/+milestone/2012.08 More information on Linaro QEMU is available at: https://launchpad.net/qemu-linaro

13 years, 9 months

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Re: [Linaro-toolchain-builds] [cbuild] gcc-linaro-4.7-2012.08 armv7l failed

by Michael Hope

On 15 August 2012 00:45, Matthew Gretton-Dann <matthew.gretton-dann(a)linaro.org> wrote: > So looking at the logs this seems to be a transient data transfer error: > > The logs (http://builds.linaro.org/toolchain/gcc-linaro-4.7-2012.08/logs/armv7l-natty…) > have: > > make[4]: Entering directory `/scratch/cbuild/slave/slaves/tcpanda02' > make -s -f ../../lib/fetch.mk > gcc-linaro-4.7-2012.08/gcc-linaro-4.7-2012.08.tar-spawn 2>&1 | grep -v > '^make\[' > Trying http://builds.linaro.org/toolchain/snapshots/gcc-linaro-4.7/gcc-linaro-4.7-… > Trying http://ex.seabright.co.nz/snapshots/gcc-linaro-4.7/gcc-linaro-4.7-2012.08.t… > Trying http://builds.linaro.org/toolchain/snapshots/gcc-linaro-4.7-2012.08.tar.xz > Trying http://ex.seabright.co.nz/snapshots/gcc-linaro-4.7-2012.08.tar.xz > Trying http://builds.linaro.org/toolchain/snapshots/gcc-linaro-4.7/gcc-linaro-4.7-… > Trying http://ex.seabright.co.nz/snapshots/gcc-linaro-4.7/gcc-linaro-4.7-2012.08.t… > Trying http://builds.linaro.org/toolchain/snapshots/gcc-linaro-4.7-2012.08.tar.bz2 > Trying http://ex.seabright.co.nz/snapshots/gcc-linaro-4.7-2012.08.tar.bz2 > bunzip2: gcc-linaro-4.7-2012.08/gcc-linaro-4.7-2012.08.tar.bz2: data > integrity (CRC) error in data Not sure here. ex.seabright is the authoritative source. Perhaps there was a fault with the proxy in the control lab? The good news is that the test fired and the build failed early. I've logged LP: #1036867 to see if it happens again. > The x86_64 build has succeeded OK though, so I (well Ramana really) > have, eventually, restarted that build. We did encounter some issues > with restarting the build as follows: > > 1) My Launchpad ID doesn't have permissions to spawn jobs through the > web interface at ex.seabright.co.nz Fixed. > 2) So I attempted to spawn the job manually as follows: > > $ ssh -p7023 cbuild(a)ex.seabright.co.nz ./cbuild/tools/spawn.sh > gcc-linaro-4.7-2012.08 armv5-builder > Spawning gcc-linaro-4.7-2012.08 into the queue benchmarks > Spawned into a9-builder > > This wasn't exactly what I expected. What are the correct runes > here to get a build? Spawn picks the closest spawn class based on the filename or, if supplied, the second argument. Here you supplied 'armv5...' which is closest to 'benchmarks'. What you want is to click 'Release' beside the job name in the scheduler view, to respawn through the /spawn interface, or to touch the .job file in cbuild@orion:~/queue/armv5-builder. > I've left this job in place as I've probably done enough damage already... > > 3) Ramana then attempted to use the web-interface at > http://ex.seabright.co.nz/helpers/recent to get the job to rebuild > (http://ex.seabright.co.nz/helpers/scheduler/spawn?queue=armv7l&job=gcc-lina…). > However, this results in a Python exception. Real men don't use user-friendly argument checking :) Well, not on hacks like this tool. There is no armv7l queue so an assert fired. > 4) Finally we used Ramana's credentials on the spawn interface, and > that seems to have spawned the rebuild correctly. Good. > I'll let this run and see what happens. > > Michael, can you just check that things are progressing properly > please, and also give me appropriate permissions on the web interface? Checking: http://ex.seabright.co.nz/helpers/buildlog/gcc-linaro-4.7-2012 shows that the build finished on x86_64 and i686. Checking /scheduler shows that ARM builds are in progress on a9hf, a9, and armv5. Most are in the testsuite and have ~6 hours to go. -- Michael

13 years, 9 months

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[Activity] Week 32

by Ramana Radhakrishnan

== Progress == Linaro tasks. * Some work on the intrinsics patches. * Looked into auto-inc-dec stuff. Not enough improvements with scheduler changes. * Helped Matt get up to speed and wrote up some stuff for Christophe with the vext examples. * Investigated a bug that Mans reported upstream with the compiler generating vdupeq . Have a patch being tested. == Plans == * Finish up pending patches upstream. (neon intrinsics patches need to be committed) * Finish handing over patches. * Fix PR54212.

13 years, 9 months

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[Activity] Week 31

by Ramana Radhakrishnan

Looks like I missed sending this for 2 weeks in a row. == Progress == Linaro tasks. * Some upstream discussions on neon testsuite bug. Poked at ML for quite a bit. Looks like regexps in the neon intrinsics testsuite is just wrong. * Looking at a better way of doing the 64 bit arithmetic patches that carrot proposed. Don't like them. * Discussed with Richard about ubfx for a while. * Reviewed the backlog and came up with suggestions for things for people to do . Thought a bit about some stuff that Michael asked me to look at . == Plans == * Look at auto-inc-dec patches more and investigate benchmark results. * Follow up on Intrinsics work. * Follow-up on my intrinsics patches upstream. * Finish looking at PR53664 and clean up testsuite further. * Set up a TC2 for Linaro for benchmarking in the validation lab. == Absences == * 17th Sept - 5th Oct - Vacation approved. * 29th Oct - 5th Nov - Copenhagen Linaro Connect. Travel and hotel to be booked.

13 years, 9 months

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Linaro 2012-08 GCC 4.6 and 4.7 releases

by Matthew Gretton-Dann

All, Is there anything left to go into the branches that needs to be in the releases this week? I believe Uli's patches have gone in - is there anything else required? I will start spinning the releases around 0800 UTC tomorrow if nothing else is needed for the release. Thanks, Matt -- Matthew Gretton-Dann Linaro Toolchain Working Group matthew.gretton-dann(a)linaro.org

13 years, 9 months

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Options for ARM A9 Cortex-MP without FPU

by Peter

I would like to run Ubuntu 12.04 on a A9 Cortex-MP/armv7-a development system that has *no FPU* hardware floating point unit. Does this mean the entire toolchain needs to be recompiled? Could you please shed light on appropriate settings (toolchain and/or kernel) soft FPU emulation related options for armv7-a without a FPU? Thank...Peter

13 years, 9 months

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[ACTIVITY] Aug 8 - Aug 10

by Christophe Lyon

== Progress == * Started Linaro ramp up process * Lots of admin, PC setup, Linaro docs reading * Still unable to make bzr work. Investigating proxy restrictions. * Started working on "constant vec permute operation for the vext instruction" * Still some pending internal work == Next week * Out of office Wed 15, Friday 17 and Monday 20 * Attend appropriate Virtual Connect sessions * Progress on "constant vec permute operation for the vext instruction"

13 years, 9 months

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Virtual Connect next week

by Michael Hope

Virtual Connect is up next week. We've got two sessions lined up: the first on profile guided optimisation and link time optimisation, and the second on next steps with the vectoriser. Some other highlights are the ones on system trace, Dalvik, and Aarch64 via OpenEmbedded bootstrap. The schedule is up at: http://www.linaro.org/linaro-blog/2012/08/07/linaro-announces-virtual-conne… Our sessions are "Analyzing vectorizer performance regressions in GCC 4.7 and 4.8" at 1000 UTC on Monday and "Exploring The Performance Impact of PGO and LTO on ARM" at 1000 UTC on Thursday. You'll need Google Hangout set up to join. For those who can't make it, the sessions also get recorded out to the Linaro OnAir YouTube channel. I've cancelled the Monday regular and Thursday stand up calls. See you next week! -- Michael

13 years, 9 months

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[ACTIVITY] report week 32

by Peter Maydell

Current Milestones: || || Planned || Estimate || Actual || ||cp15-rework || 2012-01-06 || 2012-06-23 || 2012-06-24 || ||a15-lpae-support || 2012-07-13 || 2012-07-20 || 2012-07-20 || ||clean-up-kvm-patches || || || || ||track-kvm-abi-changes || || || || ||fake-trustzone || || || || Overall KVM plan for 'do by end August': QEMU parts of this are a mix of clean-up-kvm-patches and track-kvm-abi-changes blueprints, mostly. http://cards.linaro.org/browse/CARD-167 == clean-up-kvm-patches == * did enough cleanup to be able to send a coherent initial RFC patchset to qemu-devel/kvmarm. == other == * upstream patch review, in preparation for QEMU 1.2 freeze next week * put together qemu-linaro 2012.08 tarball (release next week) KVM blueprint progress tracker: http://apus.seabright.co.nz/helpers/backlog?group_by=topic&colour_by=state&… -- PMM

13 years, 9 months

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[ACTIVITY] Aug 6 - Aug 10

by Ulrich Weigand

== GCC == * Back-ported patch to change vector alignment to 8 to FSF GCC 4.6 and 4.7 and Linaro GCC 4.6 and 4.7. * Investigated mp3player benchmark regression with Linaro GCC 4.7 backport of vector alignment patch. Mit freundlichen Gruessen / Best Regards Ulrich Weigand -- Dr. Ulrich Weigand | Phone: +49-7031/16-3727 STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E. IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht Stuttgart, HRB 243294

13 years, 9 months

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[ACTIVITY] Aug 6 - Aug 10

by Matthew Gretton-Dann

== Progress == * Started Linaro ramp up process * Lots of admin, paperwork, and PC setup * Successfully built compilers from Linaro and upstream trees * Out of office Friday 10 == Next Week == * Out of office Friday 17 * Attend appropriate Virtual Connect sessions * Do the 2012.08 release of the Toolchain * Start working on symbol_ref split benchmarking. == Future == * Find a small patch to GCC to use to pipeclean the submission process -- Matthew Gretton-Dann Linaro Toolchain Working Group matthew.gretton-dann(a)linaro.org

13 years, 9 months

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Vector-alignment patch performance regressions

by Ulrich Weigand

Hello, I've had a look at the mp3player performance regressions (just with *some* data sets) with the vector-alignment patch. Interestingly it turns out that the patch basically does not change the generated code for the hot spot (inv_mdct routine) at all. (The *only* change is which bits of the incoming pointer the run-time alignment check generated by the vectorizer tests for. But this has no practical consequences, since the check itself is not hot, and the *decision* made by the check is the same anyway -- everything is in fact properly aligned at runtime.) The other difference, outside of code, introduced by the vector-alignment patch is that some global arrays used to be forcibly aligned to 16 bytes by the vectorizer, and they are now only aligned to 8 bytes. To check whether this makes a difference, I've modified the compiler as a hack to always force all global arrays to be 16 byte aligned. And interestingly enough, this appears to fix this particular performance regression ... Any thoughts as to why this might be the case? What are the recommendations on the ARM hardware side as to what alignment is prefered? Mit freundlichen Gruessen / Best Regards Ulrich Weigand -- Dr. Ulrich Weigand | Phone: +49-7031/16-3727 STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E. IBM Deutschland Research & Development GmbH Vorsitzende des Aufsichtsrats: Martina Koederitz | Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht Stuttgart, HRB 243294

13 years, 9 months

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