101 lines
3.2 KiB (Stored with Git LFS)
Markdown
101 lines
3.2 KiB (Stored with Git LFS)
Markdown
# TensorFlow Bazel Clang
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This is a specialized toolchain that uses an old Debian with a new Clang that
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can cross compile to any x86_64 microarchitecture. It's intended to build Linux
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binaries that only require the following ABIs:
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- GLIBC_2.18
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- CXXABI_1.3.7 (GCC 4.8.3)
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- GCC_4.2.0
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Which are available on at least the following Linux platforms:
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- Ubuntu 14+
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- CentOS 7+
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- Debian 8+
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- SuSE 13.2+
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- Mint 17.3+
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- Manjaro 0.8.11
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# System Install
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On Debian 8 (Jessie) Clang 6.0 can be installed as follows:
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```sh
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cat >>/etc/apt/sources.list <<'EOF'
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deb http://apt.llvm.org/jessie/ llvm-toolchain-jessie main
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deb-src http://apt.llvm.org/jessie/ llvm-toolchain-jessie main
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EOF
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wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
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apt-key fingerprint |& grep '6084 F3CF 814B 57C1 CF12 EFD5 15CF 4D18 AF4F 7421'
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apt-get update
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apt-get install clang lld
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```
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# Bazel Configuration
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This toolchain can compile TensorFlow in 2m30s on a 96-core Skylake GCE VM if
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the following `.bazelrc` settings are added:
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```
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startup --host_jvm_args=-Xmx30G
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startup --host_jvm_args=-Xms30G
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startup --host_jvm_args=-XX:MaxNewSize=3g
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startup --host_jvm_args=-XX:-UseAdaptiveSizePolicy
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startup --host_jvm_args=-XX:+UseConcMarkSweepGC
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startup --host_jvm_args=-XX:TargetSurvivorRatio=70
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startup --host_jvm_args=-XX:SurvivorRatio=6
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startup --host_jvm_args=-XX:+UseCMSInitiatingOccupancyOnly
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startup --host_jvm_args=-XX:CMSFullGCsBeforeCompaction=1
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startup --host_jvm_args=-XX:CMSInitiatingOccupancyFraction=75
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build --jobs=100
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build --local_resources=200000,100,100
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build --crosstool_top=@local_config_clang6//clang6
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build --noexperimental_check_output_files
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build --nostamp
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build --config=opt
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build --noexperimental_check_output_files
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build --copt=-march=native
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build --host_copt=-march=native
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```
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# x86_64 Microarchitectures
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## Intel CPU Line
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- 2003 P6 M SSE SSE2
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- 2004 prescott SSE3 SSSE3 (-march=prescott)
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- 2006 core X64 SSE4.1 (only on 45nm variety) (-march=core2)
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- 2008 nehalem SSE4.2 VT-x VT-d (-march=nehalem)
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- 2010 westmere CLMUL AES (-march=westmere)
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- 2012 sandybridge AVX TXT (-march=sandybridge)
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- 2012 ivybridge F16C MOVBE (-march=ivybridge)
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- 2013 haswell AVX2 TSX BMI2 FMA (-march=haswell)
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- 2014 broadwell RDSEED ADCX PREFETCHW (-march=broadwell - works on trusty gcc4.9)
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- 2015 skylake SGX ADX MPX AVX-512[xeon-only] (-march=skylake / -march=skylake-avx512 - needs gcc7)
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- 2018 cannonlake AVX-512 SHA (-march=cannonlake - needs clang5)
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## Intel Low Power CPU Line
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- 2013 silvermont SSE4.1 SSE4.2 VT-x (-march=silvermont)
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- 2016 goldmont SHA (-march=goldmont - needs clang5)
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## AMD CPU Line
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- 2003 k8 SSE SSE2 (-march=k8)
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- 2005 k8 (Venus) SSE3 (-march=k8-sse3)
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- 2008 barcelona SSE4a?! (-march=barcelona)
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- 2011 bulldozer SSE4.1 SSE4.2 CLMUL AVX AES FMA4?! (-march=bdver1)
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- 2011 piledriver FMA (-march=bdver2)
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- 2015 excavator AVX2 BMI2 MOVBE (-march=bdver4)
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## Google Compute Engine Supported CPUs
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- 2012 sandybridge 2.6gHz -march=sandybridge
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- 2012 ivybridge 2.5gHz -march=ivybridge
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- 2013 haswell 2.3gHz -march=haswell
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- 2014 broadwell 2.2gHz -march=broadwell
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- 2015 skylake 2.0gHz -march=skylake-avx512
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See: <https://cloud.google.com/compute/docs/cpu-platforms>
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