linearregression / pulse_otp

Providing PULSE instrumentable versions of Erlang OTP components

pulse_otp

pulse_otp provides slightly modified copies of Erlang OTP components. These components are meant to be instrumented by the PULSE tool. This is by no means a complete set of OTP modules, we have only added modules that we have needed while testing other applications.

Included modules

Currently the following modules are provided:

• pulse_gen_server
• pulse_supervisor
• pulse_application
• pulse_gen
• pulse_proc_lib
• pulse_application_master
• pulse_application_controller
• pulse_application_starter

Installation

In order to compile the modules with PULSE you need Quviq QuickCheck. There is an Emakefile in the /ebin directory that compiles the modules.

Installation is optional, you just need to make sure that the beam-files can be found by the code loader.

Usage

The usage of these modules are fairly straight forward. One uses the pulse_replace_module funtionality of PULSE. For example:

-compile({pulse_replace_module, [{gen_server, pulse_gen_server}]}).

Will replace all calls to gen_server by a corresponding call to pulse_gen_server.

One should note however that using pulse_application in parallel with the normal application modules is a little bit subtle. Applications usually depend on other applications, for example many applications require that the stdlib application is running. However, we do normally not want to start a separate (instrumented) version of stdlib. Therefore, pulse_application will also look in the normal application for running applications. Also, since the application management is normally started by the init process we have made some additions to start pulse_application automatically as soon as it is needed.

Technical notes

The modules are from Erlang R15B, but in order to compile also on R14 some callback-specs have been commented out.

Other changes to the original modules include:

• renaming atoms (xxxx to pulse_xxxx)
• renaminge ETS table names
• the above mentioned changes in pulse_application