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Can two different strings generate the same MD5 hash code?
...ed attacker can produce 2 colliding assets in a matter of seconds worth of CPU power. So if you want to use MD5, make sure that such an attacker would not compromise the security of your application!
Also, consider the ramifications if an attacker could forge a collision to an existing asset in you...
How can I maintain fragment state when added to the back stack?
...s well. It does not only keep fragment state, but also reduces the RAM and CPU load (because we only inflate layout if necessary). I can't believe Google's sample code and document never mention it but always inflate layout.
Version 1(Don't use version 1. Use version 2)
public class FragmentA exte...
Using msbuild to execute a File System Publish Profile
...me and properties
to suit you):
msbuild Website.csproj "/p:Platform=AnyCPU;Configuration=Release;PublishDestination=F:\Temp\Publish" /t:PublishToFileSystem
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Find the nth occurrence of substring in a string
...actually have to copy the whole file into memory:
In [4]: %time s = mm[:]
CPU times: user 813 ms, sys: 3.25 s, total: 4.06 s
Wall time: 17.7 s
Ouch! Fortunately s still fits in the 4 GB of memory of my Macbook Air, so let's benchmark findnth():
In [5]: %timeit find_nth.findnth(s, '\n', 1000000)
...
multiprocessing: sharing a large read-only object between processes?
... the time that
Process.start() was called.
Example
On Windows (single CPU):
#!/usr/bin/env python
import os, sys, time
from multiprocessing import Pool
x = 23000 # replace `23` due to small integers share representation
z = [] # integers are immutable, let's try mutable object
def printx(...
LinkedBlockingQueue vs ConcurrentLinkedQueue
... values by "busy waiting", for example, with the consumer thread eating up CPU.
So which one is "better" depends on the number of consumer threads, on the rate they consume/produce, etc. A benchmark is needed for each scenario.
One particular use case where the ConcurrentLinkedQueue is clearly bet...
How to refresh app upon shaking the device?
...er should be deactivated onPause and activated onResume to save resources (CPU, Battery).
The code assumes we are on planet Earth ;-) and initializes the acceleration to earth gravity. Otherwise you would get a strong "shake" when the application starts and "hits" the ground from free-fall. However,...
Does Parallel.ForEach limit the number of active threads?
...P for any work that cannot be trivially reasoned about as being explicitly CPU bound.)
– user2864740
Apr 11 '17 at 23:31
...
Most efficient way of making an if-elif-elif-else statement when the else is done the most?
...e(1000000):
the_thing = options[something]
...and note the amount of CPU time they use...
1.py: 160ms
2.py: 170ms
3.py: 110ms
4.py: 100ms
...using the user time from time(1).
Option #4 does have the additional memory overhead of adding a new item for every distinct key miss, so if you're e...
bash HISTSIZE vs. HISTFILESIZE?
... Look, my hard drive is 1 TB and largely empty, and I have gobs of idle CPU cycles and RAM, and I want to save as much bash history as reasonably possible -- so when I need to look up that stupid command I haven't run in two years, I know it's in my bash history. To make it more concrete, let's s...