In [10]:
%load_ext autoreload
%autoreload 2
%matplotlib inline
import sys
import time
import threading
import multiprocessing
import datetime as dt
from mongobase.mongobase import MongoBase, db_context
from bson import ObjectId
The autoreload extension is already loaded. To reload it, use:
%reload_ext autoreload
First, let's talk about ObjectId.
In [11]:
x = ObjectId()
time.sleep(1)
y = ObjectId()
time.sleep(1)
z = ObjectId()
In [12]:
x
Out[12]:
ObjectId('5c821fd0b520d9a7d9820a5d')
In [13]:
str(x)
Out[13]:
'5c821fd0b520d9a7d9820a5d'
In [14]:
x.generation_time
Out[14]:
datetime.datetime(2019, 3, 8, 7, 54, 56, tzinfo=<bson.tz_util.FixedOffset object at 0x113e38550>)
In [15]:
y.generation_time
Out[15]:
datetime.datetime(2019, 3, 8, 7, 54, 57, tzinfo=<bson.tz_util.FixedOffset object at 0x113e38550>)
In [16]:
x < y and y < z
Out[16]:
True
Actually, ObjectId is usuful. It is unique, sortable and memory efficient.
http://api.mongodb.com/python/current/api/bson/objectid.html
An ObjectId is a 12-byte unique identifier consisting of:
a 4-byte value representing the seconds since the Unix epoch,
a 3-byte machine identifier,
a 2-byte process id, and
a 3-byte counter, starting with a random value.
And also ObjectId is fast for inserting or indexing. The index size is small.
https://github.com/Restuta/mongo.Guid-vs-ObjectId-performance
So now, we create a simple test collection with MongoBase.
In [17]:
class Bird(MongoBase):
__collection__ = 'birds'
__structure__ = {
'_id': ObjectId,
'name': str,
'age': int,
'is_able_to_fly': bool,
'created': dt.datetime,
'updated': dt.datetime
}
__required_fields__ = ['_id', 'name']
__default_values__ = {
'_id': ObjectId(),
'is_able_to_fly': False,
'created': dt.datetime.now(dt.timezone.utc),
'updated': dt.datetime.now(dt.timezone.utc)
}
__validators__ = {}
__indexed_keys__ = {}
The __structure__ part represents the definition of the model.
Let's try basic instractions like inserts, updates, find and remove.
Firstly, let's begin with creating an instance to be stored.
In [18]:
chicken = Bird({'_id': ObjectId(), 'name': 'chicken', 'age': 3})
In [19]:
chicken
Out[19]:
{'_id': ObjectId('5c821fd2b520d9a7d9820a61'),
'name': 'chicken',
'age': 3,
'is_able_to_fly': False,
'created': datetime.datetime(2019, 3, 8, 7, 54, 58, 601376, tzinfo=datetime.timezone.utc),
'updated': datetime.datetime(2019, 3, 8, 7, 54, 58, 601380, tzinfo=datetime.timezone.utc)}
In [20]:
chicken._id.generation_time
Out[20]:
datetime.datetime(2019, 3, 8, 7, 54, 58, tzinfo=<bson.tz_util.FixedOffset object at 0x113e38550>)
Good chicken. Let's save while it is fresh.
In [21]:
chicken.save()
Out[21]:
{'_id': ObjectId('5c821fd2b520d9a7d9820a61'),
'name': 'chicken',
'age': 3,
'is_able_to_fly': False,
'created': datetime.datetime(2019, 3, 8, 7, 54, 58, 601376, tzinfo=datetime.timezone.utc),
'updated': datetime.datetime(2019, 3, 8, 7, 54, 58, 601380, tzinfo=datetime.timezone.utc)}
Chickens are considered to be unable to fly by default. We can let it be enable by updating.
In [22]:
chicken.is_able_to_fly
Out[22]:
False
In [23]:
chicken.is_able_to_fly = True
chicken.update()
Out[23]:
{'_id': ObjectId('5c821fd2b520d9a7d9820a61'),
'name': 'chicken',
'age': 3,
'is_able_to_fly': True,
'created': datetime.datetime(2019, 3, 8, 7, 54, 58, 601376, tzinfo=datetime.timezone.utc),
'updated': datetime.datetime(2019, 3, 8, 7, 54, 58, 601380, tzinfo=datetime.timezone.utc)}
You would be able to see 'is_able_to_fly': True.
Chickens grow up in several ways.
In [24]:
chicken.age = 5
chicken = chicken.update()
assert chicken.age == 5, 'something wrong on update()'
chicken = Bird.findAndUpdateById(chicken._id, {'age': 6})
assert chicken.age == 6, 'something wrong on findAndUpdateById()'
Next let's try find methods.
In [25]:
mother_chicken = Bird({'_id': ObjectId(), 'name': 'mother chicken', 'age': 63})
mother_chicken.save()
Out[25]:
{'_id': ObjectId('5c821fd2b520d9a7d9820a62'),
'name': 'mother chicken',
'age': 63,
'is_able_to_fly': False,
'created': datetime.datetime(2019, 3, 8, 7, 54, 58, 601376, tzinfo=datetime.timezone.utc),
'updated': datetime.datetime(2019, 3, 8, 7, 54, 58, 601380, tzinfo=datetime.timezone.utc)}
Now we can retrieve the same document from database.
In [26]:
Bird.findOne({'name': 'mother chicken'})
Out[26]:
{'_id': ObjectId('5c821fd2b520d9a7d9820a62'),
'name': 'mother chicken',
'age': 63,
'is_able_to_fly': False,
'created': datetime.datetime(2019, 3, 8, 7, 54, 58, 601000),
'updated': datetime.datetime(2019, 3, 8, 7, 54, 58, 601000)}
It is the same chicken, isn't it? great. Let's clear (eat) it.
In [27]:
mother_chicken.remove()
Out[27]:
1
In [28]:
if not Bird.findOne({'_id': mother_chicken._id}):
print('Yes. The mother chicken not found. Someone might ate it.')
Yes. The mother chicken not found. Someone might ate it.
Now we get all chickens which we stored so far.
In [29]:
all_chickens = Bird.find({'name': 'chicken'}, sort=[('_id', 1)])
In [30]:
len(all_chickens)
Out[30]:
1
Or we can count with count() method directly.
In [31]:
Bird.count({'name': 'chicken'})
Out[31]:
1
Let's check if the latest chicken is equal to the one which we just saved.
In [32]:
all_chickens[-1]._id.generation_time == chicken._id.generation_time
Out[32]:
True
Is that True, right?
MongoBase automatically creates mongodb client for each process.
But in some cases, some instances must be written or read for a different client or db.
If you use db context, it uses a designated database within the context.
Let's get try on it.
In [33]:
with db_context(db_uri='localhost', db_name='test') as db:
print(db)
flamingo = Bird({'_id': ObjectId(), 'name': 'flamingo', 'age': 20})
flamingo.save(db=db)
flamingo.age = 23
flamingo = flamingo.update(db=db)
assert flamingo.age == 23, 'something wrong on update()'
flamingo = Bird.findAndUpdateById(flamingo._id, {'age': 24}, db=db)
assert flamingo.age == 24, 'something wrong on findAndUpdateById()'
n_flamingo = Bird.count({'name': 'flamingo'}, db=db)
print(f'{n_flamingo} flamingo found in the test database.')
n_flamingo = Bird.count({'name': 'flamingo'})
print(f'{n_flamingo} flamingo found in the default database.')
assert n_flamingo == 0
Database(MongoClient(host=['localhost:27017'], document_class=dict, tz_aware=False, connect=True, connecttimeoutms=3000, serverselectiontimeoutms=3000, sockettimeoutms=300000, socketkeepalive=True, maxidletimems=40000, maxpoolsize=200, minpoolsize=10, waitqueuemultiple=12, waitqueuetimeoutms=100), 'test')
1 flamingo found in the test database.
0 flamingo found in the default database.
Many insert operations takes a large computing cost. Fortunately, MongoDB provides an operation named "bulk write".
It enables to insert many documents in one operation.
Bulk Insert
In [34]:
many_pigeon = []
for i in range(10000):
many_pigeon += [Bird({'_id': ObjectId(), 'name': f'pigeon', 'age': i})]
print(many_pigeon[1])
{'_id': ObjectId('5c821fd3b520d9a7d9820a66'), 'name': 'pigeon', 'age': 1, 'is_able_to_fly': False, 'created': datetime.datetime(2019, 3, 8, 7, 54, 58, 601376, tzinfo=datetime.timezone.utc), 'updated': datetime.datetime(2019, 3, 8, 7, 54, 58, 601380, tzinfo=datetime.timezone.utc)}
In [35]:
%%time
Bird.bulk_insert(many_pigeon)
CPU times: user 99.1 ms, sys: 3.27 ms, total: 102 ms
Wall time: 127 ms
Out[35]:
10000
In [36]:
Bird.count({'name': 'pigeon'})
Out[36]:
10000
Bulk Update
In [37]:
updates = []
for pigeon in many_pigeon:
pigeon.age *= 3
updates += [pigeon]
In [38]:
%%time
print(len(updates))
Bird.bulk_update(updates)
10000
UpdateOne({'_id': ObjectId('5c821fd3b520d9a7d9820a65')}, {'$set': {'name': 'pigeon', 'age': 0, 'is_able_to_fly': False, 'created': datetime.datetime(2019, 3, 8, 7, 54, 58, 601376, tzinfo=datetime.timezone.utc), 'updated': datetime.datetime(2019, 3, 8, 7, 54, 59, 398739, tzinfo=datetime.timezone.utc)}}, False, None, None)
CPU times: user 247 ms, sys: 5.24 ms, total: 252 ms
Wall time: 475 ms
Check if all ages are updated
In [39]:
%%time
for i, pigeon in enumerate(many_pigeon):
check = Bird.findOne({'_id': pigeon._id})
assert check.age == i*3
CPU times: user 1.53 s, sys: 167 ms, total: 1.69 s
Wall time: 2.21 s
No error? Cool.
In [40]:
Bird.delete({'name': 'pigeon'})
Out[40]:
10000
In [41]:
def breed(i):
try:
sparrow = Bird({'_id': ObjectId(), 'name': f'sparrow', 'age': 0})
sparrow.save()
sparrow.age += 1
sparrow.update()
except Exception as e:
print(f'Exception occured. {e} in thread {threading.current_thread()}')
else:
print(f'{i} saved in thread {threading.current_thread()}.')
Threading (using the same memory space)
The threading module uses threads, the multiprocessing module uses processes. The difference is that threads run in the same memory space, while processes have separate memory. This makes it a bit harder to share objects between processes with multiprocessing. Since threads use the same memory, precautions have to be taken or two threads will write to the same memory at the same time. This is what the global interpreter lock is for.
https://stackoverflow.com/questions/3044580/multiprocessing-vs-threading-python
In [42]:
%%time
for i in range(1000):
t = threading.Thread(target=breed, name=f'breed sparrow {i}', args=(i,))
t.start()
Bird.delete({'name':'sparrow'})
7 saved in thread <Thread(breed sparrow 7, started 123145615044608)>.
6 saved in thread <Thread(breed sparrow 6, started 123145609789440)>.0 saved in thread <Thread(breed sparrow 0, started 123145573003264)>.1 saved in thread <Thread(breed sparrow 1, started 123145583513600)>.
4 saved in thread <Thread(breed sparrow 4, started 123145599279104)>.3 saved in thread <Thread(breed sparrow 3, started 123145594023936)>.5 saved in thread <Thread(breed sparrow 5, started 123145604534272)>.
8 saved in thread <Thread(breed sparrow 8, started 123145620299776)>.
2 saved in thread <Thread(breed sparrow 2, started 123145588768768)>.
9 saved in thread <Thread(breed sparrow 9, started 123145625554944)>.
14 saved in thread <Thread(breed sparrow 14, started 123145573003264)>.
12 saved in thread <Thread(breed sparrow 12, started 123145641320448)>.10 saved in thread <Thread(breed sparrow 10, started 123145630810112)>.
11 saved in thread <Thread(breed sparrow 11, started 123145636065280)>.15 saved in thread <Thread(breed sparrow 15, started 123145583513600)>.13 saved in thread <Thread(breed sparrow 13, started 123145615044608)>.
17 saved in thread <Thread(breed sparrow 17, started 123145588768768)>.
16 saved in thread <Thread(breed sparrow 16, started 123145594023936)>.
18 saved in thread <Thread(breed sparrow 18, started 123145599279104)>.
19 saved in thread <Thread(breed sparrow 19, started 123145604534272)>.
20 saved in thread <Thread(breed sparrow 20, started 123145609789440)>.
23 saved in thread <Thread(breed sparrow 23, started 123145615044608)>.21 saved in thread <Thread(breed sparrow 21, started 123145573003264)>.
24 saved in thread <Thread(breed sparrow 24, started 123145620299776)>.
22 saved in thread <Thread(breed sparrow 22, started 123145583513600)>.
26 saved in thread <Thread(breed sparrow 26, started 123145594023936)>.
25 saved in thread <Thread(breed sparrow 25, started 123145588768768)>.27 saved in thread <Thread(breed sparrow 27, started 123145599279104)>.
28 saved in thread <Thread(breed sparrow 28, started 123145604534272)>.29 saved in thread <Thread(breed sparrow 29, started 123145609789440)>.
31 saved in thread <Thread(breed sparrow 31, started 123145583513600)>.
30 saved in thread <Thread(breed sparrow 30, started 123145573003264)>.
33 saved in thread <Thread(breed sparrow 33, started 123145594023936)>.
32 saved in thread <Thread(breed sparrow 32, started 123145588768768)>.
35 saved in thread <Thread(breed sparrow 35, started 123145609789440)>.
37 saved in thread <Thread(breed sparrow 37, started 123145615044608)>.34 saved in thread <Thread(breed sparrow 34, started 123145599279104)>.36 saved in thread <Thread(breed sparrow 36, started 123145604534272)>.
39 saved in thread <Thread(breed sparrow 39, started 123145583513600)>.
40 saved in thread <Thread(breed sparrow 40, started 123145573003264)>.
38 saved in thread <Thread(breed sparrow 38, started 123145620299776)>.
43 saved in thread <Thread(breed sparrow 43, started 123145594023936)>.42 saved in thread <Thread(breed sparrow 42, started 123145588768768)>.44 saved in thread <Thread(breed sparrow 44, started 123145599279104)>.
41 saved in thread <Thread(breed sparrow 41, started 123145625554944)>.
45 saved in thread <Thread(breed sparrow 45, started 123145604534272)>.
46 saved in thread <Thread(breed sparrow 46, started 123145609789440)>.
47 saved in thread <Thread(breed sparrow 47, started 123145583513600)>.
49 saved in thread <Thread(breed sparrow 49, started 123145615044608)>.
48 saved in thread <Thread(breed sparrow 48, started 123145573003264)>.
50 saved in thread <Thread(breed sparrow 50, started 123145620299776)>.51 saved in thread <Thread(breed sparrow 51, started 123145594023936)>.
52 saved in thread <Thread(breed sparrow 52, started 123145588768768)>.53 saved in thread <Thread(breed sparrow 53, started 123145599279104)>.
55 saved in thread <Thread(breed sparrow 55, started 123145583513600)>.56 saved in thread <Thread(breed sparrow 56, started 123145609789440)>.
54 saved in thread <Thread(breed sparrow 54, started 123145604534272)>.
58 saved in thread <Thread(breed sparrow 58, started 123145573003264)>.
57 saved in thread <Thread(breed sparrow 57, started 123145615044608)>.
59 saved in thread <Thread(breed sparrow 59, started 123145625554944)>.
60 saved in thread <Thread(breed sparrow 60, started 123145594023936)>.62 saved in thread <Thread(breed sparrow 62, started 123145583513600)>.
63 saved in thread <Thread(breed sparrow 63, started 123145588768768)>.
61 saved in thread <Thread(breed sparrow 61, started 123145599279104)>.
64 saved in thread <Thread(breed sparrow 64, started 123145609789440)>.
65 saved in thread <Thread(breed sparrow 65, started 123145604534272)>.
66 saved in thread <Thread(breed sparrow 66, started 123145573003264)>.67 saved in thread <Thread(breed sparrow 67, started 123145615044608)>.
68 saved in thread <Thread(breed sparrow 68, started 123145620299776)>.
71 saved in thread <Thread(breed sparrow 71, started 123145588768768)>.69 saved in thread <Thread(breed sparrow 69, started 123145583513600)>.
70 saved in thread <Thread(breed sparrow 70, started 123145594023936)>.
74 saved in thread <Thread(breed sparrow 74, started 123145609789440)>.72 saved in thread <Thread(breed sparrow 72, started 123145599279104)>.
75 saved in thread <Thread(breed sparrow 75, started 123145625554944)>.
76 saved in thread <Thread(breed sparrow 76, started 123145573003264)>.73 saved in thread <Thread(breed sparrow 73, started 123145604534272)>.
78 saved in thread <Thread(breed sparrow 78, started 123145588768768)>.77 saved in thread <Thread(breed sparrow 77, started 123145583513600)>.
80 saved in thread <Thread(breed sparrow 80, started 123145615044608)>.
79 saved in thread <Thread(breed sparrow 79, started 123145594023936)>.
81 saved in thread <Thread(breed sparrow 81, started 123145620299776)>.
83 saved in thread <Thread(breed sparrow 83, started 123145609789440)>.
84 saved in thread <Thread(breed sparrow 84, started 123145573003264)>.82 saved in thread <Thread(breed sparrow 82, started 123145599279104)>.85 saved in thread <Thread(breed sparrow 85, started 123145604534272)>.
86 saved in thread <Thread(breed sparrow 86, started 123145625554944)>.89 saved in thread <Thread(breed sparrow 89, started 123145594023936)>.
87 saved in thread <Thread(breed sparrow 87, started 123145588768768)>.88 saved in thread <Thread(breed sparrow 88, started 123145583513600)>.
90 saved in thread <Thread(breed sparrow 90, started 123145615044608)>.
91 saved in thread <Thread(breed sparrow 91, started 123145620299776)>.
92 saved in thread <Thread(breed sparrow 92, started 123145630810112)>.
96 saved in thread <Thread(breed sparrow 96, started 123145604534272)>.95 saved in thread <Thread(breed sparrow 95, started 123145599279104)>.93 saved in thread <Thread(breed sparrow 93, started 123145609789440)>.
94 saved in thread <Thread(breed sparrow 94, started 123145573003264)>.
97 saved in thread <Thread(breed sparrow 97, started 123145588768768)>.
99 saved in thread <Thread(breed sparrow 99, started 123145594023936)>.
98 saved in thread <Thread(breed sparrow 98, started 123145583513600)>.
100 saved in thread <Thread(breed sparrow 100, started 123145615044608)>.
101 saved in thread <Thread(breed sparrow 101, started 123145620299776)>.
102 saved in thread <Thread(breed sparrow 102, started 123145609789440)>.
104 saved in thread <Thread(breed sparrow 104, started 123145588768768)>.
103 saved in thread <Thread(breed sparrow 103, started 123145573003264)>.
106 saved in thread <Thread(breed sparrow 106, started 123145594023936)>.
105 saved in thread <Thread(breed sparrow 105, started 123145599279104)>.
107 saved in thread <Thread(breed sparrow 107, started 123145604534272)>.
108 saved in thread <Thread(breed sparrow 108, started 123145583513600)>.
110 saved in thread <Thread(breed sparrow 110, started 123145588768768)>.109 saved in thread <Thread(breed sparrow 109, started 123145615044608)>.
111 saved in thread <Thread(breed sparrow 111, started 123145573003264)>.
112 saved in thread <Thread(breed sparrow 112, started 123145609789440)>.
114 saved in thread <Thread(breed sparrow 114, started 123145620299776)>.115 saved in thread <Thread(breed sparrow 115, started 123145599279104)>.
113 saved in thread <Thread(breed sparrow 113, started 123145594023936)>.
117 saved in thread <Thread(breed sparrow 117, started 123145583513600)>.116 saved in thread <Thread(breed sparrow 116, started 123145604534272)>.
119 saved in thread <Thread(breed sparrow 119, started 123145588768768)>.118 saved in thread <Thread(breed sparrow 118, started 123145573003264)>.120 saved in thread <Thread(breed sparrow 120, started 123145599279104)>.
123 saved in thread <Thread(breed sparrow 123, started 123145615044608)>.
121 saved in thread <Thread(breed sparrow 121, started 123145609789440)>.
124 saved in thread <Thread(breed sparrow 124, started 123145620299776)>.122 saved in thread <Thread(breed sparrow 122, started 123145594023936)>.
126 saved in thread <Thread(breed sparrow 126, started 123145604534272)>.
125 saved in thread <Thread(breed sparrow 125, started 123145583513600)>.
127 saved in thread <Thread(breed sparrow 127, started 123145625554944)>.128 saved in thread <Thread(breed sparrow 128, started 123145630810112)>.
129 saved in thread <Thread(breed sparrow 129, started 123145573003264)>.
132 saved in thread <Thread(breed sparrow 132, started 123145615044608)>.
130 saved in thread <Thread(breed sparrow 130, started 123145588768768)>.
133 saved in thread <Thread(breed sparrow 133, started 123145609789440)>.131 saved in thread <Thread(breed sparrow 131, started 123145599279104)>.134 saved in thread <Thread(breed sparrow 134, started 123145594023936)>.
136 saved in thread <Thread(breed sparrow 136, started 123145604534272)>.
137 saved in thread <Thread(breed sparrow 137, started 123145620299776)>.
135 saved in thread <Thread(breed sparrow 135, started 123145583513600)>.
138 saved in thread <Thread(breed sparrow 138, started 123145573003264)>.
143 saved in thread <Thread(breed sparrow 143, started 123145609789440)>.139 saved in thread <Thread(breed sparrow 139, started 123145625554944)>.
141 saved in thread <Thread(breed sparrow 141, started 123145599279104)>.
140 saved in thread <Thread(breed sparrow 140, started 123145588768768)>.142 saved in thread <Thread(breed sparrow 142, started 123145594023936)>.
144 saved in thread <Thread(breed sparrow 144, started 123145615044608)>.145 saved in thread <Thread(breed sparrow 145, started 123145604534272)>.
147 saved in thread <Thread(breed sparrow 147, started 123145573003264)>.
146 saved in thread <Thread(breed sparrow 146, started 123145583513600)>.148 saved in thread <Thread(breed sparrow 148, started 123145620299776)>.
149 saved in thread <Thread(breed sparrow 149, started 123145630810112)>.
150 saved in thread <Thread(breed sparrow 150, started 123145609789440)>.151 saved in thread <Thread(breed sparrow 151, started 123145588768768)>.
152 saved in thread <Thread(breed sparrow 152, started 123145594023936)>.
153 saved in thread <Thread(breed sparrow 153, started 123145573003264)>.
154 saved in thread <Thread(breed sparrow 154, started 123145583513600)>.
156 saved in thread <Thread(breed sparrow 156, started 123145604534272)>.
155 saved in thread <Thread(breed sparrow 155, started 123145599279104)>.157 saved in thread <Thread(breed sparrow 157, started 123145615044608)>.
158 saved in thread <Thread(breed sparrow 158, started 123145588768768)>.
159 saved in thread <Thread(breed sparrow 159, started 123145609789440)>.160 saved in thread <Thread(breed sparrow 160, started 123145620299776)>.
161 saved in thread <Thread(breed sparrow 161, started 123145594023936)>.
162 saved in thread <Thread(breed sparrow 162, started 123145573003264)>.
163 saved in thread <Thread(breed sparrow 163, started 123145583513600)>.
164 saved in thread <Thread(breed sparrow 164, started 123145599279104)>.
166 saved in thread <Thread(breed sparrow 166, started 123145604534272)>.
165 saved in thread <Thread(breed sparrow 165, started 123145588768768)>.
167 saved in thread <Thread(breed sparrow 167, started 123145609789440)>.
170 saved in thread <Thread(breed sparrow 170, started 123145620299776)>.168 saved in thread <Thread(breed sparrow 168, started 123145615044608)>.
169 saved in thread <Thread(breed sparrow 169, started 123145594023936)>.
171 saved in thread <Thread(breed sparrow 171, started 123145573003264)>.
172 saved in thread <Thread(breed sparrow 172, started 123145625554944)>.
173 saved in thread <Thread(breed sparrow 173, started 123145583513600)>.
174 saved in thread <Thread(breed sparrow 174, started 123145599279104)>.
176 saved in thread <Thread(breed sparrow 176, started 123145604534272)>.
179 saved in thread <Thread(breed sparrow 179, started 123145609789440)>.
177 saved in thread <Thread(breed sparrow 177, started 123145594023936)>.
178 saved in thread <Thread(breed sparrow 178, started 123145573003264)>.175 saved in thread <Thread(breed sparrow 175, started 123145588768768)>.
181 saved in thread <Thread(breed sparrow 181, started 123145620299776)>.
180 saved in thread <Thread(breed sparrow 180, started 123145615044608)>.
183 saved in thread <Thread(breed sparrow 183, started 123145599279104)>.
182 saved in thread <Thread(breed sparrow 182, started 123145583513600)>.
184 saved in thread <Thread(breed sparrow 184, started 123145594023936)>.
185 saved in thread <Thread(breed sparrow 185, started 123145573003264)>.186 saved in thread <Thread(breed sparrow 186, started 123145588768768)>.
188 saved in thread <Thread(breed sparrow 188, started 123145609789440)>.
189 saved in thread <Thread(breed sparrow 189, started 123145599279104)>.
187 saved in thread <Thread(breed sparrow 187, started 123145604534272)>.
191 saved in thread <Thread(breed sparrow 191, started 123145594023936)>.
190 saved in thread <Thread(breed sparrow 190, started 123145583513600)>.192 saved in thread <Thread(breed sparrow 192, started 123145615044608)>.
194 saved in thread <Thread(breed sparrow 194, started 123145588768768)>.
193 saved in thread <Thread(breed sparrow 193, started 123145573003264)>.
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869 saved in thread <Thread(breed sparrow 869, started 123145588768768)>.872 saved in thread <Thread(breed sparrow 872, started 123145583513600)>.
871 saved in thread <Thread(breed sparrow 871, started 123145604534272)>.
873 saved in thread <Thread(breed sparrow 873, started 123145620299776)>.
875 saved in thread <Thread(breed sparrow 875, started 123145599279104)>.874 saved in thread <Thread(breed sparrow 874, started 123145615044608)>.
876 saved in thread <Thread(breed sparrow 876, started 123145594023936)>.
877 saved in thread <Thread(breed sparrow 877, started 123145609789440)>.878 saved in thread <Thread(breed sparrow 878, started 123145625554944)>.880 saved in thread <Thread(breed sparrow 880, started 123145583513600)>.
879 saved in thread <Thread(breed sparrow 879, started 123145573003264)>.
881 saved in thread <Thread(breed sparrow 881, started 123145588768768)>.
882 saved in thread <Thread(breed sparrow 882, started 123145604534272)>.
883 saved in thread <Thread(breed sparrow 883, started 123145594023936)>.
884 saved in thread <Thread(breed sparrow 884, started 123145599279104)>.
885 saved in thread <Thread(breed sparrow 885, started 123145615044608)>.
886 saved in thread <Thread(breed sparrow 886, started 123145583513600)>.
887 saved in thread <Thread(breed sparrow 887, started 123145573003264)>.
889 saved in thread <Thread(breed sparrow 889, started 123145604534272)>.
891 saved in thread <Thread(breed sparrow 891, started 123145620299776)>.890 saved in thread <Thread(breed sparrow 890, started 123145609789440)>.
888 saved in thread <Thread(breed sparrow 888, started 123145588768768)>.
892 saved in thread <Thread(breed sparrow 892, started 123145594023936)>.
894 saved in thread <Thread(breed sparrow 894, started 123145615044608)>.
893 saved in thread <Thread(breed sparrow 893, started 123145599279104)>.
895 saved in thread <Thread(breed sparrow 895, started 123145625554944)>.896 saved in thread <Thread(breed sparrow 896, started 123145573003264)>.899 saved in thread <Thread(breed sparrow 899, started 123145630810112)>.
897 saved in thread <Thread(breed sparrow 897, started 123145583513600)>.
898 saved in thread <Thread(breed sparrow 898, started 123145604534272)>.
900 saved in thread <Thread(breed sparrow 900, started 123145609789440)>.
903 saved in thread <Thread(breed sparrow 903, started 123145620299776)>.
902 saved in thread <Thread(breed sparrow 902, started 123145594023936)>.
901 saved in thread <Thread(breed sparrow 901, started 123145588768768)>.905 saved in thread <Thread(breed sparrow 905, started 123145615044608)>.
904 saved in thread <Thread(breed sparrow 904, started 123145599279104)>.906 saved in thread <Thread(breed sparrow 906, started 123145636065280)>.
907 saved in thread <Thread(breed sparrow 907, started 123145573003264)>.
908 saved in thread <Thread(breed sparrow 908, started 123145583513600)>.
909 saved in thread <Thread(breed sparrow 909, started 123145604534272)>.
911 saved in thread <Thread(breed sparrow 911, started 123145594023936)>.
910 saved in thread <Thread(breed sparrow 910, started 123145609789440)>.913 saved in thread <Thread(breed sparrow 913, started 123145615044608)>.
912 saved in thread <Thread(breed sparrow 912, started 123145588768768)>.
914 saved in thread <Thread(breed sparrow 914, started 123145599279104)>.
915 saved in thread <Thread(breed sparrow 915, started 123145620299776)>.916 saved in thread <Thread(breed sparrow 916, started 123145573003264)>.919 saved in thread <Thread(breed sparrow 919, started 123145604534272)>.
917 saved in thread <Thread(breed sparrow 917, started 123145583513600)>.
918 saved in thread <Thread(breed sparrow 918, started 123145594023936)>.921 saved in thread <Thread(breed sparrow 921, started 123145609789440)>.
920 saved in thread <Thread(breed sparrow 920, started 123145588768768)>.922 saved in thread <Thread(breed sparrow 922, started 123145599279104)>.
924 saved in thread <Thread(breed sparrow 924, started 123145625554944)>.923 saved in thread <Thread(breed sparrow 923, started 123145615044608)>.
925 saved in thread <Thread(breed sparrow 925, started 123145630810112)>.
926 saved in thread <Thread(breed sparrow 926, started 123145573003264)>.
927 saved in thread <Thread(breed sparrow 927, started 123145583513600)>.928 saved in thread <Thread(breed sparrow 928, started 123145604534272)>.
932 saved in thread <Thread(breed sparrow 932, started 123145609789440)>.930 saved in thread <Thread(breed sparrow 930, started 123145594023936)>.
929 saved in thread <Thread(breed sparrow 929, started 123145588768768)>.
931 saved in thread <Thread(breed sparrow 931, started 123145599279104)>.
933 saved in thread <Thread(breed sparrow 933, started 123145615044608)>.
934 saved in thread <Thread(breed sparrow 934, started 123145620299776)>.
935 saved in thread <Thread(breed sparrow 935, started 123145573003264)>.
936 saved in thread <Thread(breed sparrow 936, started 123145583513600)>.937 saved in thread <Thread(breed sparrow 937, started 123145588768768)>.
938 saved in thread <Thread(breed sparrow 938, started 123145594023936)>.
939 saved in thread <Thread(breed sparrow 939, started 123145599279104)>.940 saved in thread <Thread(breed sparrow 940, started 123145604534272)>.
941 saved in thread <Thread(breed sparrow 941, started 123145609789440)>.
943 saved in thread <Thread(breed sparrow 943, started 123145573003264)>.942 saved in thread <Thread(breed sparrow 942, started 123145615044608)>.
944 saved in thread <Thread(breed sparrow 944, started 123145588768768)>.
946 saved in thread <Thread(breed sparrow 946, started 123145594023936)>.945 saved in thread <Thread(breed sparrow 945, started 123145583513600)>.
947 saved in thread <Thread(breed sparrow 947, started 123145599279104)>.
948 saved in thread <Thread(breed sparrow 948, started 123145604534272)>.
949 saved in thread <Thread(breed sparrow 949, started 123145609789440)>.
951 saved in thread <Thread(breed sparrow 951, started 123145615044608)>.
950 saved in thread <Thread(breed sparrow 950, started 123145573003264)>.
952 saved in thread <Thread(breed sparrow 952, started 123145588768768)>.953 saved in thread <Thread(breed sparrow 953, started 123145583513600)>.
954 saved in thread <Thread(breed sparrow 954, started 123145594023936)>.
955 saved in thread <Thread(breed sparrow 955, started 123145599279104)>.
958 saved in thread <Thread(breed sparrow 958, started 123145609789440)>.
956 saved in thread <Thread(breed sparrow 956, started 123145604534272)>.
959 saved in thread <Thread(breed sparrow 959, started 123145615044608)>.
957 saved in thread <Thread(breed sparrow 957, started 123145620299776)>.
960 saved in thread <Thread(breed sparrow 960, started 123145573003264)>.
962 saved in thread <Thread(breed sparrow 962, started 123145588768768)>.
963 saved in thread <Thread(breed sparrow 963, started 123145594023936)>.
961 saved in thread <Thread(breed sparrow 961, started 123145583513600)>.
966 saved in thread <Thread(breed sparrow 966, started 123145609789440)>.964 saved in thread <Thread(breed sparrow 964, started 123145599279104)>.
967 saved in thread <Thread(breed sparrow 967, started 123145615044608)>.
968 saved in thread <Thread(breed sparrow 968, started 123145573003264)>.
969 saved in thread <Thread(breed sparrow 969, started 123145620299776)>.
965 saved in thread <Thread(breed sparrow 965, started 123145604534272)>.
970 saved in thread <Thread(breed sparrow 970, started 123145588768768)>.971 saved in thread <Thread(breed sparrow 971, started 123145625554944)>.
972 saved in thread <Thread(breed sparrow 972, started 123145594023936)>.
973 saved in thread <Thread(breed sparrow 973, started 123145583513600)>.
974 saved in thread <Thread(breed sparrow 974, started 123145609789440)>.
976 saved in thread <Thread(breed sparrow 976, started 123145615044608)>.
977 saved in thread <Thread(breed sparrow 977, started 123145573003264)>.978 saved in thread <Thread(breed sparrow 978, started 123145620299776)>.975 saved in thread <Thread(breed sparrow 975, started 123145599279104)>.
979 saved in thread <Thread(breed sparrow 979, started 123145604534272)>.
981 saved in thread <Thread(breed sparrow 981, started 123145625554944)>.980 saved in thread <Thread(breed sparrow 980, started 123145588768768)>.
982 saved in thread <Thread(breed sparrow 982, started 123145583513600)>.
983 saved in thread <Thread(breed sparrow 983, started 123145594023936)>.
984 saved in thread <Thread(breed sparrow 984, started 123145630810112)>.
985 saved in thread <Thread(breed sparrow 985, started 123145609789440)>.
987 saved in thread <Thread(breed sparrow 987, started 123145599279104)>.
986 saved in thread <Thread(breed sparrow 986, started 123145573003264)>.
989 saved in thread <Thread(breed sparrow 989, started 123145583513600)>.988 saved in thread <Thread(breed sparrow 988, started 123145604534272)>.
990 saved in thread <Thread(breed sparrow 990, started 123145588768768)>.
991 saved in thread <Thread(breed sparrow 991, started 123145594023936)>.992 saved in thread <Thread(breed sparrow 992, started 123145615044608)>.
993 saved in thread <Thread(breed sparrow 993, started 123145609789440)>.
995 saved in thread <Thread(breed sparrow 995, started 123145573003264)>.
996 saved in thread <Thread(breed sparrow 996, started 123145620299776)>.994 saved in thread <Thread(breed sparrow 994, started 123145599279104)>.
999 saved in thread <Thread(breed sparrow 999, started 123145604534272)>.998 saved in thread <Thread(breed sparrow 998, started 123145588768768)>.
997 saved in thread <Thread(breed sparrow 997, started 123145583513600)>.
CPU times: user 936 ms, sys: 453 ms, total: 1.39 s
Wall time: 1.01 s
Multiprocessing (using the separated memory for each process)
PyMongo is not fork-safe. Care must be taken when using instances of MongoClient with fork(). Specifically, instances of MongoClient must not be copied from a parent process to a child process. Instead, the parent process and each child process must create their own instances of MongoClient. Instances of MongoClient copied from the parent process have a high probability of deadlock in the child process due to the inherent incompatibilities between fork(), threads, and locks described below. PyMongo will attempt to issue a warning if there is a chance of this deadlock occurring. http://api.mongodb.com/python/current/faq.html#pymongo-fork-safe%3E
In [43]:
def breed2(tasks):
db = Bird._db() # create a MongoDB Client for the forked process
try:
for i in range(len(tasks)):
sparrow = Bird({'_id': ObjectId(), 'name': f'sparrow', 'age': 0})
sparrow.save(db=db)
sparrow.age += 1
sparrow.update(db=db)
except Exception as e:
print(f'Exception occured. {e} in process {multiprocessing.current_process()}')
else:
print(f'{len(tasks)} sparrow saved in process {multiprocessing.current_process()}.')
In [44]:
%%time
print(f'{multiprocessing.cpu_count()} cpu resources found.')
tasks = [[f'sparrow {i}' for i in range(250)] for j in range(4)]
process_pool = multiprocessing.Pool(4)
process_pool.map(breed2, tasks)
12 cpu resources found.
250 sparrow saved in process <ForkProcess(ForkPoolWorker-4, started daemon)>.
250 sparrow saved in process <ForkProcess(ForkPoolWorker-2, started daemon)>.
250 sparrow saved in process <ForkProcess(ForkPoolWorker-1, started daemon)>.
250 sparrow saved in process <ForkProcess(ForkPoolWorker-3, started daemon)>.
CPU times: user 11.9 ms, sys: 15.9 ms, total: 27.8 ms
Wall time: 286 ms
Content source: kazukiotsuka/mongobase
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