[issue43592] test_importlib: test_multiprocessing_pool_circular_import() fails with "Too many open files" error on os.pipe()

[STINNER Victor]

STINNER Victor <vstin...@python.org> added the comment:

> x86-64 macOS 3.10: https://buildbot.python.org/all/#/builders/681/builds/345

On this machine, RLIMIT_NOFILE soft limit is 256.

test.pythoninfo:

resource.RLIMIT_NOFILE: (256, 9223372036854775807)
platform.platform: macOS-11.5.2-x86_64-i386-64bit
socket.hostname: mattb-mbp2

All limits:

resource.RLIMIT_AS: (9223372036854775807, 9223372036854775807)
resource.RLIMIT_CORE: (0, 9223372036854775807)
resource.RLIMIT_CPU: (9223372036854775807, 9223372036854775807)
resource.RLIMIT_DATA: (9223372036854775807, 9223372036854775807)
resource.RLIMIT_FSIZE: (9223372036854775807, 9223372036854775807)
resource.RLIMIT_MEMLOCK: (9223372036854775807, 9223372036854775807)
resource.RLIMIT_NOFILE: (256, 9223372036854775807)
resource.RLIMIT_NPROC: (2784, 4176)
resource.RLIMIT_RSS: (9223372036854775807, 9223372036854775807)
resource.RLIMIT_STACK: (67104768, 67104768)
resource.pagesize: 4096

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