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@ -168,6 +168,10 @@ class LinuxPolicy(Policy):
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more CPUs exist.
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more CPUs exist.
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- Children such as SSH may be scheduled on any CPU except 0/1.
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- Children such as SSH may be scheduled on any CPU except 0/1.
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If the machine has less than 4 cores available, the top-level and workers
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are pinned between CPU 2..N, i.e. no CPU is reserved for the top-level
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process.
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This could at least be improved by having workers pinned to independent
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This could at least be improved by having workers pinned to independent
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cores, before reusing the second hyperthread of an existing core.
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cores, before reusing the second hyperthread of an existing core.
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@ -180,6 +184,14 @@ class LinuxPolicy(Policy):
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self.mem = mmap.mmap(-1, 4096)
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self.mem = mmap.mmap(-1, 4096)
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self.state = State.from_buffer(self.mem)
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self.state = State.from_buffer(self.mem)
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self.state.lock.init()
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self.state.lock.init()
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if self._cpu_count() < 4:
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self._reserve_mask = 3
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self._reserve_shift = 2
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self._reserve_controller = True
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else:
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self._reserve_mask = 1
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self._reserve_shift = 1
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self._reserve_controller = False
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def _set_affinity(self, mask):
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def _set_affinity(self, mask):
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mitogen.parent._preexec_hook = self._clear
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mitogen.parent._preexec_hook = self._clear
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@ -197,16 +209,21 @@ class LinuxPolicy(Policy):
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finally:
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finally:
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self.state.lock.release()
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self.state.lock.release()
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self._set_cpu(2 + (n % max(1, (self._cpu_count() - 2))))
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self._set_cpu(self._reserve_shift + (
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(n % max(1, (self._cpu_count() - self._reserve_shift)))
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)
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def _set_cpu(self, cpu):
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def _set_cpu(self, cpu):
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self._set_affinity(1 << cpu)
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self._set_affinity(1 << cpu)
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def _clear(self):
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def _clear(self):
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self._set_affinity(0xffffffff & ~3)
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self._set_affinity(0xffffffff & ~self._reserve_mask)
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def assign_controller(self):
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def assign_controller(self):
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if self._reserve_controller:
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self._set_cpu(1)
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self._set_cpu(1)
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else:
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self._balance()
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def assign_muxprocess(self):
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def assign_muxprocess(self):
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self._set_cpu(0)
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self._set_cpu(0)
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