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node and Error: EMFILE, too many open files
...n...
To get a count of open files for a certain pid
I used this command to test the number of files that were opened after doing various events in my app.
lsof -i -n -P | grep "8465" | wc -l
# lsof -i -n -P | grep "nodejs.*8465" | wc -l
28
# lsof -i -n -P | grep "nodejs.*8465" | wc -l
31
# lsof -i ...
How to use shared memory with Linux in C
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try this code sample, I tested it, source: http://www.makelinux.net/alp/035
#include <stdio.h>
#include <sys/shm.h>
#include <sys/stat.h>
int main ()
{
int segment_id;
char* shared_memory;
struct shmid_ds shmbuffer;
...
UIViewController viewDidLoad vs. viewWillAppear: What is the proper division of labor?
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Initially used only ViewDidLoad with tableView. On testing with loss of Wifi, by setting device to airplane mode, realized that the table did not refresh with return of Wifi. In fact, there appears to be no way to refresh tableView on the device even by hitting the home butto...
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...y sum of squared by rsqrt of it, which is exactly what you've done in your tests), and it performed better.
2. Computing rsqrt using simple lookup table might be easier, as for rsqrt, when x goes to infinity, 1/sqrt(x) goes to 0, so for small x's the function values doesn't change (a lot), whereas...
How to debug Visual Studio extensions
... It seems that this works only if the versions you use to debug and to test are the same. So you can't debug in 2013 and run the extension in 2015. @SrikanthVenugopalan
– Maria Ines Parnisari
Mar 9 '16 at 4:00
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CSS transition effect makes image blurry / moves image 1px, in Chrome?
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I recommended an experimental new attribute CSS I tested on latest browser and it's good:
image-rendering: optimizeSpeed; /* */
image-rendering: -moz-crisp-edges; /* Firefox */
image-rendering: -o-crisp-edges; ...
Xcode changes unmodified storyboard and XIB files
...n. Because sets do not preserve the order of their elements, even the slightest modification could change the whole storyboard XML file.
Why does the class tag disappear or reappear randomly?
The <class> section is nothing more than an internal Xcode cache. Xcode use it to cache information ab...
insert multiple rows via a php array into mysql
...ary copying. Primarily, this means you want to avoid concatenation. The fastest and most memory efficient way to build a large string, such as for inserting hundreds of rows at one, is to take advantage of the implode() function and array assignment.
$sql = array();
foreach( $data as $row ) {
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My docker container has no internet
...e (same as OP, Ubuntu 14.04 / Docker 18.01.0-ce). This link can be usefull test internet connection without ping if you don't have ping command on your docker image. If your host don't have systemctl (Ubuntu 14.04) try How to restart the networking service? and/or restart you computer.
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Insert new column into table in sqlite?
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In my tests, line INSERT INTO t1 SELECT a,c FROM t1_backup; causes the error: "table t1 has 3 columns but 2 values were supplied: INSERT INTO t1 SELECT a,c FROM t1_backup;". The correct line should be INSERT INTO t1 (a,c) SELECT a,...