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Cannot ping AWS EC2 instance
... You should see something like:
PING 10.0.0.15 (10.0.0.15): 56 data bytes
64 bytes from 10.0.0.14: icmp_seq=1 ttl=64 time=3.9 ms
64 bytes from 10.0.0.14: icmp_seq=2 ttl=64 time=3.9 ms
64 bytes from 10.0.0.14: icmp_seq=3 ttl=64 time=10.6 ms
64 bytes from 10.0.0.14: icmp_seq=4 ttl=64 time=40.6 ms
64 ...
How can I tell if I'm running in 64-bit JVM or 32-bit JVM (from within a program)?
How can I tell if the JVM in which my application runs is 32 bit or 64-bit? Specifically, what functions or properties I can used to detect this within the program?
...
How do I determine if my python shell is executing in 32bit or 64bit?
...("%x" % sys.maxsize, sys.maxsize > 2**32)'
('7fffffff', False)
$ python-64 -c 'import sys;print("%x" % sys.maxsize, sys.maxsize > 2**32)'
('7fffffffffffffff', True)
sys.maxsize was introduced in Python 2.6. If you need a test for older systems, this slightly more complicated test should wor...
Differences between “BEGIN RSA PRIVATE KEY” and “BEGIN PRIVATE KEY”
...8 encoded data starts and ends with the tags:
-----BEGIN PRIVATE KEY-----
BASE64 ENCODED DATA
-----END PRIVATE KEY-----
Within the base64 encoded data the following DER structure is present:
PrivateKeyInfo ::= SEQUENCE {
version Version,
algorithm AlgorithmIdentifier,
Pri...
How do I determine the size of an object in Python?
...rom collections import Set, Mapping, deque
try: # Python 2
zero_depth_bases = (basestring, Number, xrange, bytearray)
iteritems = 'iteritems'
except NameError: # Python 3
zero_depth_bases = (str, bytes, Number, range, bytearray)
iteritems = 'items'
def getsize(obj_0):
"""Recurs...
传感器组件 · App Inventor 2 中文网
...）、速度（如果设备支持） 和地址。
也可以执行“地理编码”，转换给定的地址（不限于当前地址）到纬度（使用 由地址求纬度方法）和经度（使用 由地址求经度 方法）。
中文网注：如果获取不了经纬度，请尝试开启一下...
What does the brk() system call do?
...
If you want to do fancy memory allocation, either base it oon top of malloc, or on top of mmap. Don't touch brk and sbrk, they are relics from the past that do more harm than good (even the manpages tell you to stay clear of them!)
– Eloff
...
jquery save json data object in cookie
...lead to a bug in some browsers.
Before using it, you should convert it to base64 (using btoa), and when reading it, convert from base64 (using atob).
val = JSON.stringify(userData)
val = btoa(val)
write_cookie(val)
share...
Git Bash is extremely slow on Windows 7 x64
... it is significantly faster on my machine, from ~0.75 s to 0.1 s.
This is based on this blog post.
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Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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