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program main

    implicit none
    integer, parameter :: max_greeting_length=30
    character(len=max_greeting_length), allocatable :: greeting[:]
    integer :: IMAGE

    allocate(greeting[*])
    write(greeting,"(2(a,i2))") "Hello from image ", this_image()," of ",num_images()
    sync all

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! Created by Tobias Burnus 2010.
! https://gcc.gnu.org/wiki/CoarrayExample

program Hello_World

    implicit none
    integer :: i  ! Local variable
    character(len=20) :: name[*] ! scalar coarray
    ! Note: "name" is the local variable while "name[<index>]"
    ! accesses the variable on a remote image

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[ bondedtypes ]
; bonds  angles  dihedrals  impropers all_dihedrals nrexcl HH14 RemoveDih
  1      1       3          1         1             3      1    0

[ NPA ]
 [ atoms ]
   C1     CH3_C    0.000     1
   C      C_C      0.000     1
   C2     CH3_C    0.000     1
   C3     CH3_C    0.000     1

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COMPND    NEOPENTANE
AUTHOR    JAMES W. BARNETT
REMARK    FOR USE WITH TRAPPEUA
HETATM    1  C1  NPA     1       0.487  -0.369  -1.673  1.00  0.00           C  
HETATM    2  C   NPA     1      -0.333  -0.352  -0.375  1.00  0.00           C  
HETATM    3  C2  NPA     1      -1.783  -0.752  -0.681  1.00  0.00           C  
HETATM    4  C3  NPA     1       0.272  -1.347   0.625  1.00  0.00           C  
HETATM    5  C4  NPA     1      -0.307   1.059   0.228  1.00  0.00           C  
END

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[ bondedtypes ]
; bonds  angles  dihedrals  impropers all_dihedrals nrexcl HH14 RemoveDih
  1      1       3          1         1             3      1    0        

[ NPA ]
 [ atoms ]
   C1     CH3_C    0.000     1
   C      C_C      0.000     1
   C2     CH3_C    0.000     1
   C3     CH3_C    0.000     1

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; Include forcefield parameters
#include "trappeua.ff/forcefield.itp"

[ moleculetype ]
; Name            nrexcl
Neopentane          3

[ atoms ]
;   nr       type  resnr residue  atom   cgnr     charge       mass  typeB    chargeB      massB
; residue   1 NPA rtp NPA  q  0.0

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Server setup

AWS

1. Visit https://aws.amazon.com and sign up for an account.
2. Install and configure the aws-cli program according to here.

Then do:

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Getting into the Serverless Mindset

Example of scaling EC2 instance used for serving http requests. Most applications don't have a perfectly constant load. Must provision for peak load, paying for it when idle. Solution would be to add EC2 Auto Scaling Group.

Must also make it highly available by spreading across availability zones.

Things I have to manage - application and code, infrastructure. Infrastructure best practices are often the same across customers.

Requests -> Business Logic -> Backend