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How to update Python?
.... 2.7.4),
different major version of official Python (e.g. 3.3), install side-by-side with old, set paths/associations to point to dominant (e.g. 2.7), shortcut to other (e.g. in BASH $ ln /c/Python33/python.exe python3).
The answer depends:
If OP has 2.7.x and wants to install newer version of...
Virtual Memory Usage from Java under Linux, too much memory used
...umbers for memory. Here's what it says about the Hello World example:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2120 kgregory 20 0 4373m 15m 7152 S 0 0.2 0:00.10 java
VIRT is the virtual memory space: the sum of everything in the virtual memory map (see bel...
Is volatile expensive?
...an that volatile read operations can be done without a explicit cache invalidation on x86, and is as fast as a normal variable read (disregarding the reordering constraints of volatile)?
...
Why are C# 3.0 object initializer constructor parentheses optional?
...y correct. To flesh that out a bit more:
The feature of allowing you to elide the argument list as part of the "larger feature" of object initializers met our bar for "sugary" features. Some points we considered:
the design and specification cost was low
we were going to be extensively changing t...
How do I properly clean up Excel interop objects?
...= excelApp.Worksheets.Open(...);
...
Marshal.ReleaseComObject(sheet);
I didn't know that internally C# created a wrapper for the Worksheets COM object which didn't get released by my code (because I wasn't aware of it) and was the cause why Excel was not unloaded.
I found the solution to my probl...
Releasing memory in Python
...ory_info.
import os
import gc
import psutil
proc = psutil.Process(os.getpid())
gc.collect()
mem0 = proc.get_memory_info().rss
# create approx. 10**7 int objects and pointers
foo = ['abc' for x in range(10**7)]
mem1 = proc.get_memory_info().rss
# unreference, including x == 9999999
del foo, x
mem...
Microsecond timing in JavaScript
...ll be most probably using Date.now(), so this is still the best option considering the IE9 and it's millions of users, why mixing third-party library then
– Vitaliy Terziev
Aug 28 '16 at 13:54
...
Optimise PostgreSQL for fast testing
...ring the DDL, you can also use UNLOGGED tables in Pg 9.1+ to completely avoid WAL logging and gain a real speed boost at the cost of the tables getting erased if the server crashes. There is no configuration option to make all tables unlogged, it must be set during CREATE TABLE. In addition to being...
Eclipse Workspaces: What for and why?
...
I'll provide you with my vision of somebody who feels very uncomfortable in the Java world, which I assume is also your case.
What it is
A workspace is a concept of grouping together:
a set of (somehow) related projects
some configur...
Why shouldn't all functions be async by default?
...ch in the functional language community has gone into figuring out ways to identify how to optimize code that makes heavy use of continuation passing style. The compiler team would likely have to solve very similar problems in a world where "async" was the default and the non-async methods had to be...