racl101 + maximum   18

numpy.random.randint — NumPy v1.14 Manual
useful method for getting either an array or a 2D matrix of randomly generated integers between two numbers.

e.g.

Get a Numpy array of 100 numbers between 0 and 50

arr1 = np.random.randint(0,50, 100)

Now, suppose you want that same data in a 5 by 10 matrix. You can do this like so:

matrix_1 = arr1.reshape(5,10)
numpy  documentation  guide  reference  random  randint  method  generate  integers  between  minimum  maximum  rows  columns  shape  howto  example 
april 2018 by racl101
Raising the Maximum Number of File Descriptors (Open Files) on Ubuntu 14.04 Trusty
Really good tutorial showing how to increase the maximum number of open files (file handles) that can be opened on a Linux system, on Ubuntu 14.04 (but it works as well for Ubuntu 16.04). More importantly it shows any caveats as to why maybe changing the values might not take effect immediately as well as how to check your work by checking the maximum number of open files that a given process can have. Very applicable to Nginx when increasing the worker_rlimit_nofile setting is not enough.
blog  tutorial  howto  increase  maximum  open  file  limit  linux  ubuntu  ubuntu16.04  ubuntu14.04  example  check  process  worker_rlimit_nofile  nginx  ulimit 
november 2017 by racl101
Ubuntu 16 - how to increase maximum file open limit ( ulimit -n )
What's interesting here is that this tutorial points out that:

/proc/sys/fs/file-max

is the kernel limit to which limits in /etc/security/limits.conf can be increased. Other tutorials don't really mention it.
blog  tutorial  howto  example  guide  reference  ubuntu  ubuntu16.04  maximum  open  file  handle  limit  linux  server  ulimit  nginx  mysql 
november 2017 by racl101
ulimit - Ubuntu 16.04 Server MySql open_file_limit won't go higher than 65536 - Server Fault
Really good example to follow in case increasing max_connections and increasing limits in /etc/security/limits.conf doesn't work.
serverfault  stackexchange  howto  create  mysql  service  override  configuration  file  increase  maximum  open  limit  database  server  example  guide  reference  ubuntu  ubuntu16.04  linux 
november 2017 by racl101

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