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Multiprocessing: How to use Pool.map on a function defined in a class?
...eak
q_out.put((i, f(x)))
def parmap(f, X, nprocs=multiprocessing.cpu_count()):
q_in = multiprocessing.Queue(1)
q_out = multiprocessing.Queue()
proc = [multiprocessing.Process(target=fun, args=(f, q_in, q_out))
for _ in range(nprocs)]
for p in proc:
p.da...
How does SIGINT relate to the other termination signals such as SIGTERM, SIGQUIT and SIGKILL?
...catch or ignore it) is to terminate the process in the same way as SIGTERM etc. .
There is a table in the POSIX definitions for signal.h which lists the various signals and their default actions and purposes, and the General Terminal Interface chapter includes a lot more detail on the terminal-rela...
Canary release strategy vs. Blue/Green
... version will perform (integrate with other apps, CPU, memory, disk usage, etc).
Blue/Green:
It is more about the predictable release with zero downtime deployment.
Easy rollbacks in case of failure.
Completely automated deployment process
...
When someone writes a new programming language, what do they write it IN?
...chine language, converting a grammar specification to C code for a parser, etc. Its designer specifies the structure of the source format (parsing), what those structures mean, how to simplify the data (optimizing), and the kind of output to generate. Interpreters read the source and execute it dire...
Difference between static memory allocation and dynamic memory allocation
...ister' variables. As expected, register variables should be allocated on a CPU's register, but the decision is actually left to the compiler. You may not turn a register variable into a reference by using address-of.
register int meaning = 42;
printf("%p\n",&meaning); /* this is wrong and will...
How would Git handle a SHA-1 collision on a blob?
...ations. This took the equivalent processing power as 6,500 years of single-CPU computations and 110 years of single-GPU computations.
b/ would forge one file (with the same SHA1), but with the additional constraint its content and size would produce the identical SHA1 (a collision on the content al...
Why use armeabi-v7a code over armeabi code?
...ices, but will be a lot slower, and won't take advantage of newer devices' CPU capabilities. Do take some benchmarks for your particular application, but removing the armeabi-v7a binaries is generally not a good idea. If you need to reduce size, you might want to have two separate apks for older (a...
The difference between fork(), vfork(), exec() and clone()
...ch data structures (memory space, processor state, stack, PID, open files, etc) are shared or not.
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What does SynchronizationContext do?
...SynchronizationContext, ThreadPool.QueueUserWorkItem, control.BeginInvoke, etc. over to the new async / await keywords and the Task Parallel Library (TPL), i.e. the API surrounding the Task and Task<TResult> classes. These will, to a very high degree, take care of capturing the UI thread's syn...
What is the difference between using IDisposable vs a destructor in C#?
...ngs to GC) - but is used for example to close files, database connections, etc.
There are lots of previous topics on this:
deterministic finalization
disposing objects
using block
resources
Finally, note that it is not uncommon for an IDisposable object to also have a finalizer; in this case, D...