Dev Builds » 20250525-1928

You are viewing an old NCM Stockfish dev build test. You may find the most recent dev build tests using Stockfish 15 as the baseline here.

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NCM plays each Stockfish dev build 20,000 times against Stockfish 14. This yields an approximate Elo difference and establishes confidence in the strength of the dev builds.

Summary

Host Duration Avg Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo

Test Detail

ID Host Base NPS Games WLD Standard Elo Ptnml(0-2) Gamepair Elo CLI PGN

Commit

Commit ID e3adfaf8fcb47653d3442f47ea6c3faab161b785
Author ppigazzini
Date 2025-05-25 19:28:53 UTC
build & ci: update to NDK r27c API level 29 Update to the latest LTS version NDK r27c (27.2.12479018), the previous NDK are unsupported by Google, see: https://developer.android.com/ndk/downloads A build with NDK r27c and API level < 29 returns this error: "executable's TLS segment is underaligned: alignment is 8 (skew 0), needs to be at least 64 for ARM64 Bionic" Update the API level to 29 to use the native ELF LTS and avoid the error: https://android.googlesource.com/platform/bionic/+/HEAD/docs/elf-tls.md https://android.googlesource.com/platform/bionic/+/HEAD/android-changes-for-ndk-developers.md#elf-tls-available-for-api-level-29 A dynamic link build of Stockfish uses these libraries: ldd stockfish-android-armv8-dynamic-api35 libm.so => /system/lib64/libm.so libdl.so => /system/lib64/libdl.so libc.so => /system/lib64/libc.so ld-android.so => /system/lib64/ld-android.so ld-android.so : the dynamic linker used by Android (on Linux is named ld-linux.so), responsible for loading and linking shared libraries into an executable at runtime. libdl.so : interface/library layer that provides function for dynamic loading, relies on the underlying functionality provided by the dynamic linker libm.so : math library for Android libc.so : standard C library for Android References: Doc for native (C/C++) API https://developer.android.com/ndk/guides/stable_apis C libraries (libc, libm, libdl): https://developer.android.com/ndk/guides/stable_apis#c_library Bionic changes with API levels: https://android.googlesource.com/platform/bionic/+/HEAD/docs/status.md NDK r27c build system: https://android.googlesource.com/platform/ndk/+/ndk-r27-release/docs/BuildSystemMaintainers.md CI: Update to NDK r27c (27.2.12479018), the default version in GitHub runner, to switch to a recent clang 18. A PGO build requires static linking, because the NDK doesn't ship the Android loaders (linker/linker64), see: https://groups.google.com/g/android-ndk/c/3Ep6zD3xxSY The API level should not be an issue when distributing a static build, use the API 29, the oldest one not affected by the LTS alignement issue. closes https://github.com/official-stockfish/Stockfish/pull/6081 No functional change
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