This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
from enum import Enum, EnumMeta | |
class ChoiceEnumMeta(EnumMeta): | |
def __iter__(self): | |
return ((tag, tag.value) for tag in super().__iter__()) | |
class ChoiceEnum(Enum, metaclass=ChoiceEnumMeta): | |
""" |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#for an image ("not running container") use save: | |
docker save <dockernameortag> | gzip > mycontainer.tgz | |
#for running or paused docker, use export: | |
docker export <dockernameortag> | gzip > mycontainer.tgz | |
#load | |
gunzip -c mycontainer.tgz | docker load |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
from __future__ import unicode_literals | |
from django.db import models | |
from django.db.models.fields.related_descriptors import ForwardManyToOneDescriptor # noqa | |
class RelationNotLoaded(Exception): | |
pass | |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Latency Comparison Numbers (~2012) | |
---------------------------------- | |
L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |