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20 hours ago •
The-OpenROAD-Project
The-OpenROAD-Project
Clock tree appears to be unbalanced for BoomTile running at 833 MHz
Describe the bug
For megaboom v6, I upped the clock frequency to 833 MHz and the resulting clock tree appears to be unbalanced (see the branch of the tree on the far right in the viewer) and with significant skew:
>>> report_clock_skew
Clock clock
1742.25 source latency frontend/bpd/banked_predictors_0/loop/s1_update_bits_meta[32]$_DFF_P_/CLK ^
-1407.99 target latency frontend/bpd/banked_predictors_1/btb/meta_1_ext/R0_clk ^
-17.80 CRPR
--------------
316.47 setup skew
>>> report_clock_latency
Clock clock
rise -> rise
min max
0.00 0.00 source latency
1440.04 network latency dcache/data/array_3_1_ext/R0_clk
1838.54 network latency dcache/data/io_resp_1_0_REG[75]$_DFF_P_/CLK
---------------
1440.04 1838.54 latency
398.50 skew
fall -> fall
min max
0.00 0.00 source latency
1527.54 network latency dcache/data/array_3_1_ext/R0_clk
1954.27 network latency dcache/data/io_resp_1_0_REG[75]$_DFF_P_/CLK
---------------
1527.54 1954.27 latency
426.73 skew
Tom mentioned that sometimes the clock tree will be unbalanced when connecting to macros, so I'd like to get some feedback on whether that's the case here. Note that prior versions of BoomTile with a slower clock generated a balanced clock tree with not as much skew.
Expected Behavior
Balanced clock tree with minimal skew
Environment
[WARNING] Your current OpenROAD version is outdated.
It is recommened to pull the latest changes.
If problem persists, file a github issue with the re-producible test case.
kernel: Linux 6.5.0-1025-gcp
os: Ubuntu 22.04.4 LTS (Jammy Jellyfish)
cmake version 3.24.2
-- The CXX compiler identification is GNU 11.4.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- OpenROAD version: v2.0-16316-gf9cfd9383
-- System name: Linux
-- Compiler: GNU 11.4.0
-- Build type: RELEASE
-- Install prefix: /usr/local
-- C++ Standard: 17
-- C++ Standard Required: ON
-- C++ Extensions: OFF
-- The C compiler identification is GNU 11.4.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Performing Test C_COMPILER_SUPPORTS__-Wall
-- Performing Test C_COMPILER_SUPPORTS__-Wall - Success
-- Performing Test CXX_COMPILER_SUPPORTS__-Wall
-- Performing Test CXX_COMPILER_SUPPORTS__-Wall - Success
-- Performing Test C_COMPILER_SUPPORTS__-Wno-array-bounds
-- Performing Test C_COMPILER_SUPPORTS__-Wno-array-bounds - Success
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-array-bounds
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-array-bounds - Success
-- Performing Test C_COMPILER_SUPPORTS__-Wno-nonnull
-- Performing Test C_COMPILER_SUPPORTS__-Wno-nonnull - Success
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-nonnull
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-nonnull - Success
-- Performing Test C_COMPILER_SUPPORTS__-Wno-maybe-uninitialized
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-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-maybe-uninitialized - Success
-- Performing Test C_COMPILER_SUPPORTS__-Wno-format-overflow
-- Performing Test C_COMPILER_SUPPORTS__-Wno-format-overflow - Success
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-format-overflow
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-format-overflow - Success
-- Performing Test C_COMPILER_SUPPORTS__-Wno-unused-variable
-- Performing Test C_COMPILER_SUPPORTS__-Wno-unused-variable - Success
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-unused-variable
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-unused-variable - Success
-- Performing Test C_COMPILER_SUPPORTS__-Wno-unused-function
-- Performing Test C_COMPILER_SUPPORTS__-Wno-unused-function - Success
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-unused-function
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-unused-function - Success
-- Performing Test C_COMPILER_SUPPORTS__-Wno-write-strings
-- Performing Test C_COMPILER_SUPPORTS__-Wno-write-strings - Success
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-write-strings
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-write-strings - Success
-- Performing Test C_COMPILER_SUPPORTS__-Wno-sign-compare
-- Performing Test C_COMPILER_SUPPORTS__-Wno-sign-compare - Success
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-sign-compare
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-sign-compare - Success
-- Performing Test C_COMPILER_SUPPORTS__-Wno-deprecated
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-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-deprecated - Success
-- Performing Test C_COMPILER_SUPPORTS__-Wno-c++11-narrowing
-- Performing Test C_COMPILER_SUPPORTS__-Wno-c++11-narrowing - Failed
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-c++11-narrowing
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-c++11-narrowing - Failed
-- Performing Test C_COMPILER_SUPPORTS__-Wno-register
-- Performing Test C_COMPILER_SUPPORTS__-Wno-register - Failed
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-register
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-register - Success
-- Performing Test C_COMPILER_SUPPORTS__-Wno-format
-- Performing Test C_COMPILER_SUPPORTS__-Wno-format - Success
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-format
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-format - Success
-- Performing Test C_COMPILER_SUPPORTS__-Wno-reserved-user-defined-literal
-- PerformingCMake Warning (dev) at src/sta/CMakeLists.txt:32 (option):
Policy CMP0077 is not set: option() honors normal variables. Run "cmake
--help-policy CMP0077" for policy details. Use the cmake_policy command to
set the policy and suppress this warning.
For compatibility with older versions of CMake, option is clearing the
normal variable 'USE_TCL_READLINE'.
This warning is for project developers. Use -Wno-dev to suppress it.
Test C_COMPILER_SUPPORTS__-Wno-reserved-user-defined-literal - Failed
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-reserved-user-defined-literal
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-reserved-user-defined-literal - Failed
-- Performing Test C_COMPILER_SUPPORTS__-fpermissive
-- Performing Test C_COMPILER_SUPPORTS__-fpermissive - Failed
-- Performing Test CXX_COMPILER_SUPPORTS__-fpermissive
-- Performing Test CXX_COMPILER_SUPPORTS__-fpermissive - Success
-- Performing Test C_COMPILER_SUPPORTS__-x
-- Performing Test C_COMPILER_SUPPORTS__-x - Failed
-- Performing Test CXX_COMPILER_SUPPORTS__-x
-- Performing Test CXX_COMPILER_SUPPORTS__-x - Failed
-- Performing Test C_COMPILER_SUPPORTS__c++
-- Performing Test C_COMPILER_SUPPORTS__c++ - Failed
-- Performing Test CXX_COMPILER_SUPPORTS__c++
-- Performing Test CXX_COMPILER_SUPPORTS__c++ - Failed
-- Performing Test C_COMPILER_SUPPORTS__-std=c++17
-- Performing Test C_COMPILER_SUPPORTS__-std=c++17 - Failed
-- Performing Test CXX_COMPILER_SUPPORTS__-std=c++17
-- Performing Test CXX_COMPILER_SUPPORTS__-std=c++17 - Success
-- Performing Test C_COMPILER_SUPPORTS__-Wno-unused-but-set-variable
-- Performing Test C_COMPILER_SUPPORTS__-Wno-unused-but-set-variable - Success
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-unused-but-set-variable
-- Performing Test CXX_COMPILER_SUPPORTS__-Wno-unused-but-set-variable - Success
-- TCL library: /usr/lib/x86_64-linux-gnu/libtcl.so
-- TCL header: /usr/include/tcl/tcl.h
-- TCL readline library: /usr/lib/x86_64-linux-gnu/libtclreadline.so
-- TCL readline header: /usr/include/x86_64-linux-gnu
-- Found SWIG: /home/jeffng/dev/main/OpenROAD-flow-scripts/dependencies/bin/swig (found suitable version "4.1.0", minimum required is "4.0")
-- Using SWIG >= 4.1.0 -flatstaticmethod flag for python
-- Found Boost: /home/jeffng/dev/main/OpenROAD-flow-scripts/dependencies/lib/cmake/Boost-1.80.0/BoostConfig.cmake (found version "1.80.0")
-- boost: 1.80.0
-- Found GTest: /home/jeffng/dev/main/OpenROAD-flow-scripts/dependencies/lib/cmake/GTest/GTestConfig.cmake (found version "1.13.0")
-- GTest: 1.13.0
-- Found Python3: /usr/include/python3.10 (found version "3.10.12") found components: Development Development.Module Development.Embed
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.11")
-- Found Threads: TRUE
-- spdlog: 1.8.1
-- Found BISON: /usr/bin/bison (found version "3.8.2")
-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE)
-- STA version: 2.6.0
-- STA git sha: b5f3a02b33b8ae1739ace8a329fde94434711dd6
-- System name: Linux
-- Compiler: GNU 11.4.0
-- Build type: RELEASE
-- Build CXX_FLAGS: -O3 -DNDEBUG
-- Install prefix: /usr/local
-- Found FLEX: /usr/bin/flex (found version "2.6.4")
-- TCL library: /usr/lib/x86_64-linux-gnu/libtcl.so
-- TCL header: /usr/include/tcl/tcl.h
-- TCL readline library: /usr/lib/x86_64-linux-gnu/libtclreadline.so
-- TCL readline header: /usr/include/x86_64-linux-gnu/tclreadline.h
-- CUDD library: /usr/local/lib/libcudd.a
-- CUDD header: /usr/local/include/cudd.h
-- SSTA: 0
-- Found SWIG: /home/jeffng/dev/main/OpenROAD-flow-scripts/dependencies/bin/swig (found suitable version "4.1.0", minimum required is "3.0")
-- STA executable: /home/jeffng/dev/main/OpenROAD-flow-scripts/tools/OpenROAD/src/sta/app/sta
-- Found re2: /opt/or-tools/lib/cmake/re2/re2Config.cmake (found version "11.0.0")
-- Found Clp: /opt/or-tools/lib/cmake/Clp/ClpConfig.cmake (found version "1.17.7")
-- Found Cbc: /opt/or-tools/lib/cmake/Cbc/CbcConfig.cmake (found version "2.10.7")
-- Found SCIP: /opt/or-tools/lib/cmake/scip/scip-config.cmake (found version "9.0.0")
-- Found OpenMP_CXX: -fopenmp (found version "4.5")
-- Found OpenMP: TRUE (found version "4.5")
-- Found OR-Tools: /opt/or-tools/lib/cmake/ortools (version: 9.10.4067)
-- TCL library: /usr/lib/x86_64-linux-gnu/libtcl.so
-- TCL header: /usr/include/tcl/tcl.h
-- Found OpenMP_C: -fopenmp (found version "4.5")
-- Found OpenMP: TRUE (found version "4.5")
-- Found OpenMP: TRUE (found version "4.5")
-- GUI is enabled
-- Charts widget is enabled
-- FounNumber of processor cores: 32
d Boost: /home/jeffng/dev/main/OpenROAD-flow-scripts/dependencies/lib/cmake/Boost-1.80.0/BoostConfig.cmake (found version "1.80.0") found components: serialization
-- Could NOT find VTune (missing: VTune_LIBRARIES VTune_INCLUDE_DIRS)
-- Found Boost: /home/jeffng/dev/main/OpenROAD-flow-scripts/dependencies/lib/cmake/Boost-1.80.0/BoostConfig.cmake (found suitable version "1.80.0", minimum required is "1.78")
-- TCL library: /usr/lib/x86_64-linux-gnu/libtcl.so
-- TCL header: /usr/include/tcl/tcl.h
-- Found Boost: /home/jeffng/dev/main/OpenROAD-flow-scripts/dependencies/lib/cmake/Boost-1.80.0/BoostConfig.cmake (found version "1.80.0") found components: serialization system thread
-- Found Boost: /home/jeffng/dev/main/OpenROAD-flow-scripts/dependencies/lib/cmake/Boost-1.80.0/BoostConfig.cmake (found version "1.80.0")
-- Found Eigen3: /home/jeffng/dev/main/OpenROAD-flow-scripts/dependencies/share/eigen3/cmake/Eigen3Config.cmake (found version "3.4.0")
-- TCL readline enabled
-- Tcl Extended disabled
-- Python3 enabled
-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/tmp.Bt0W42tFUE
To Reproduce
- unpack the tarball https://drive.google.com/file/d/1eVCheqXsRstEgBQLqIi-H5i4qwO9Z6Dh/view?usp=sharing
- cd cts_BoomTile_asap7_base_2024-10-16_10-40
- ./run-me-BoomTile-asap7-base.sh gui <- I added the second argument to just pull up the GUI instead of running CTS
- type gui::show if the GUI doesn't come up (might be fixed)
- view clock tree in Clock Tree Viewer
I kept 3_place.odb in the tarball in case it's helpful.
Relevant log output
No response
Screenshots
No response
Additional Context
No response
