Editing Heterogeneity interpreter integration (section)

== PHP calling Python ==
Input / Output
* ill-formed input and output

Process
* Print the percentage of data processing

Unexpected conditions / errors
* Entry point
** Run the script from web browser: timeout<ref>[https://stackoverflow.com/questions/5798707/browser-timeouts Browser Timeouts - Stack Overflow]</ref>/crash
** Run the script from command line: length limit e.g. 
*** On {{Win}} XP<ref>[https://support.microsoft.com/en-us/help/830473/command-prompt-cmd--exe-command-line-string-limitation Command prompt (Cmd. exe) command-line string limitation] when error message 'The command line is too long.' met on windows.</ref>: 8191 characters
*** On {{Mac}} high Sierra<ref>[https://serverfault.com/questions/69430/what-is-the-maximum-length-of-a-command-line-in-mac-os-x mac osx - What is the maximum length of a command line in Mac OS X? - Server Fault]</ref>: 262144 returned after keyin {{kbd | key=getconf ARG_MAX}}

* Interpreter level
** First interpreter timeout/crash: e.g. First interpreter (.PHP) is timeout but second interpreter (.PY) is still running.
** Second interpreter timeout/crash
** Process management: Monitor and recycle the process

* System level
** e.g. memory error caused by second interpreter
* API level