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Cut RAM requirements for reading JSON in half

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This commit is contained in:
Simon Kuberski 2022-02-16 11:13:11 +01:00
parent abc1691bc9
commit bd20057f52
1 changed files with 14 additions and 4 deletions
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18
pyerrors/input/json.py
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@ -6,6 +6,7 @@ import datetime
import platform import platform
import warnings import warnings
import re import re
import gc
import numpy as np import numpy as np
from ..obs import Obs from ..obs import Obs
from ..covobs import Covobs from ..covobs import Covobs
@ -38,6 +39,8 @@ def create_json_string(ol, description='', indent=1):
my_encoder.default = _default my_encoder.default = _default
class Deltalist: class Deltalist:
__slots__ = ['cnfg', 'deltas']
def __init__(self, li): def __init__(self, li):
self.cnfg = li[0] self.cnfg = li[0]
self.deltas = li[1:] self.deltas = li[1:]
@ -53,6 +56,8 @@ def create_json_string(ol, description='', indent=1):
return self.__repr__() return self.__repr__()
class Floatlist: class Floatlist:
__slots__ = ['li']
def __init__(self, li): def __init__(self, li):
self.li = list(li) self.li = list(li)
@ -222,14 +227,18 @@ def create_json_string(ol, description='', indent=1):
else: else:
raise Exception("Unkown datatype.") raise Exception("Unkown datatype.")
jsonstring = json.dumps(d, indent=indent, cls=my_encoder, ensure_ascii=False) jsonstring = ''
for chunk in my_encoder(indent=indent, ensure_ascii=False).iterencode(d):
jsonstring += chunk
def remove_quotationmarks(s): del d
gc.collect()
def remove_quotationmarks_split(split):
"""Workaround for un-quoting of delta lists, adds 5% of work """Workaround for un-quoting of delta lists, adds 5% of work
but is save, compared to a simple replace that could destroy the structure but is save, compared to a simple replace that could destroy the structure
""" """
deltas = False deltas = False
split = s.split('\n')
for i in range(len(split)): for i in range(len(split)):
if '"deltas":' in split[i] or '"cov":' in split[i] or '"grad":' in split[i]: if '"deltas":' in split[i] or '"cov":' in split[i] or '"grad":' in split[i]:
deltas = True deltas = True
@ -239,7 +248,8 @@ def create_json_string(ol, description='', indent=1):
deltas = False deltas = False
return '\n'.join(split) return '\n'.join(split)
jsonstring = remove_quotationmarks(jsonstring) jsonstring = jsonstring.split('\n')
jsonstring = remove_quotationmarks_split(jsonstring)
jsonstring = jsonstring.replace('nan', 'NaN') jsonstring = jsonstring.replace('nan', 'NaN')
return jsonstring return jsonstring