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How do I check CPU and Memory Usage in Java?
... @ComputerScientist Because free is actually what is free (post GC) it doesn't show objects waiting for GC. To get MUCH more accurate, run 2 garbage collections before this answer. If you try it with and without GC you will find the post-GC values very consistent but the preGC will ...
how to read System environment variable in Spring applicationContext
...
You are close :o)
Spring 3.0 adds Spring Expression Language.
You can use
<util:properties id="dbProperties"
location="classpath:config_#{systemProperties['env']}/db.properties" />
Combined with java ... -Denv=QA should...
How does delete[] know it's an array?
...lly, using delete[] to delete something created with new is exploitable. taossa.com/index.php/2007/01/03/…
– Rodrigo
Apr 24 '09 at 13:20
23
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Why can't Python's raw string literals end with a single backslash?
...also that a
single backslash followed by a newline
is interpreted as those two characters
as part of the string, not as a line
continuation.
So raw strings are not 100% raw, there is still some rudimentary backslash-processing.
...
Expand Python Search Path to Other Source
...
There are a few possible ways to do this:
Set the environment variable PYTHONPATH to a colon-separated list of directories to search for imported modules.
In your program, use sys.path.append('/path/to/search') to add the names of directori...
Programmatically saving image to Django ImageField
... is a URL to an image
# self.photo is the ImageField
self.photo.save(
os.path.basename(self.url),
File(open(result[0], 'rb'))
)
self.save()
That's a bit confusing because it's pulled out of my model and a bit out of context, but the important parts are:
The image pulled from the we...
How can I start PostgreSQL server on Mac OS X?
...nchctl plists to start automatically. For more information, run brew info postgres.
Start manually
pg_ctl -D /usr/local/var/postgres start
Stop manually
pg_ctl -D /usr/local/var/postgres stop
Start automatically
"To have launchd start postgresql now and restart at login:"
brew services start postgre...
Open multiple Eclipse workspaces on the Mac
... be the officially supported way to do this as of 10.5. Earlier version of OS X and even 10.5 and up should still work using the following instructions though.
Open the command line (Terminal)
Navigate to your Eclipse installation folder, for instance:
cd /Applications/eclipse/
cd /Developer/...
Command to get time in milliseconds
...
date +%s%N returns the number of seconds + current nanoseconds.
Therefore, echo $(($(date +%s%N)/1000000)) is what you need.
Example:
$ echo $(($(date +%s%N)/1000000))
1535546718115
date +%s returns the number of seconds since the epoch, if that's useful.
...
adding directory to sys.path /PYTHONPATH
...
You could use:
import os
path = 'the path you want'
os.environ['PATH'] += ':'+path
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