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245318cb05
Running lit tests and unit tests of ASan and TSan on macOS has very bad performance when running with a high number of threads. This is caused by xnu (the macOS kernel), which currently doesn't handle mapping and unmapping of sanitizer shadow regions (reserved VM which are several terabytes large) very well. The situation is so bad that increasing the number of threads actually makes the total testing time larger. The macOS buildbots are affected by this. Note that we can't easily limit the number of sanitizer testing threads without affecting the rest of the tests. This patch adds a special "group" into lit, and limits the number of concurrently running tests in this group. This helps solve the contention problem, while still allowing other tests to run in full, that means running lit with -j8 will still with 8 threads, and parallelism is only limited in sanitizer tests. Differential Revision: https://reviews.llvm.org/D28420 llvm-svn: 292549
41 lines
1.5 KiB
Python
41 lines
1.5 KiB
Python
# -*- Python -*-
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# Configuration file for 'lit' test runner.
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# This file contains common config setup rules for unit tests in various
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# compiler-rt testsuites.
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import os
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import lit.formats
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# Setup test format
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llvm_build_mode = getattr(config, "llvm_build_mode", "Debug")
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config.test_format = lit.formats.GoogleTest(llvm_build_mode, "Test")
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# Setup test suffixes.
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config.suffixes = []
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# Tweak PATH to include llvm tools dir.
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llvm_tools_dir = getattr(config, 'llvm_tools_dir', None)
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if (not llvm_tools_dir) or (not os.path.exists(llvm_tools_dir)):
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lit_config.fatal("Invalid llvm_tools_dir config attribute: %r" % llvm_tools_dir)
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path = os.path.pathsep.join((llvm_tools_dir, config.environment['PATH']))
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config.environment['PATH'] = path
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# Propagate the temp directory. Windows requires this because it uses \Windows\
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# if none of these are present.
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if 'TMP' in os.environ:
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config.environment['TMP'] = os.environ['TMP']
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if 'TEMP' in os.environ:
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config.environment['TEMP'] = os.environ['TEMP']
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if config.host_os == 'Darwin':
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# Only run up to 3 64-bit sanitized processes simultaneously on Darwin.
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# Using more scales badly and hogs the system due to inefficient handling
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# of large mmap'd regions (terabytes) by the kernel.
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lit_config.parallelism_groups["darwin-64bit-sanitizer"] = 3
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def darwin_sanitizer_parallelism_group_func(test):
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return "darwin-64bit-sanitizer" if "x86_64" in test.file_path else ""
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config.darwin_sanitizer_parallelism_group_func = darwin_sanitizer_parallelism_group_func
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