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Fix math domain error in decaying poll rate #152

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Merged
merged 3 commits into from
Mar 1, 2018
Merged

Fix math domain error in decaying poll rate #152

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f0f4d24
Fix math domain error in decaying poll rate
Feb 28, 2018
de0ee0e
Address PR comments
Mar 1, 2018
46a1cf6
Merge branch 'master' into bugfix/math_error_poll_rate
vkarak Mar 1, 2018
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10 changes: 8 additions & 2 deletions reframe/frontend/executors/policies.py
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Original file line number Diff line number Diff line change
Expand Up @@ -78,8 +78,14 @@ def __init__(self, min_rate, decay_time):
def _init_poll_fn(self, init_rate):
self._init_rate = init_rate
self._b = self._min_rate
self._a = init_rate - self._b
self._c = math.log(self._a / (self._thres*self._b)) / self._decay
log_arg = (init_rate - self._b) / (self._thres*self._b)
if log_arg < sys.float_info.min:
self._a = 0.0
self._c = 0.0
else:
self._a = init_rate - self._b
self._c = math.log(self._a / (self._thres*self._b)) / self._decay

getlogger().debug('rate equation: %.3f*exp(-%.3f*x)+%.3f' %
(self._a, self._c, self._b))

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