Blackfire main use case is to profile HTTP requests like web pages, web service calls, or API calls.
Before starting profiling, check that you have Blackfire installed correctly on the server hosting the website you need to profile.
Profiling an HTTP request mean instrumenting the project's code, which incurs some overhead. Blackfire is apart from many other profilers because of two main differences:
You can profile HTTP requests from Google Chrome. This cookbook describes how to profile from the command line interface.
Profiling an HTTP request can be done on the command line thanks to the
blackfire utility that is bundled with the Blackfire Agent.
The easiest way to profile an HTTP request is to use the
blackfire utility. It accepts the same arguments and options as the regular
blackfire curl http://example.com/
You can get a list of options available for the
blackfire help curl
To get more accurate results, take several samples of the request via the
--samples option (we recommend you to use this option only for "safe" HTTP
requests like GET requests):
blackfire --samples 10 curl http://example.com/
At the end,
blackfire outputs the URL where the profile can be found (this
can be hidden by passing the
You can integrate Blackfire results into your own tools by using the
option to get a JSON representation of a profile:
blackfire --json curl http://example.com/
The resources consumed are available under the
keys are the cost dimensions:
Profiling non-GET requests or requests which need some specific HTTP headers is
no different as
blackfire curl supports all cURL options:
blackfire curl -XPOST http://example.com/
Blackfire automatically instruments your code, but sometimes, you might want to focus the profiling on only part of the code. That's possible when opting for manual instrumentation via the PHP SDK.
After instrumenting your code, use the
blackfire utility as above to
profile your application. When not using Blackfire, all calls are converted to
This feature is only available to Profiler, Premium and Enterprise users.
Profiling POST requests, Ajax requests, and API calls can be done via the "Profile all Requests" link in the browser Companion.
When profiling from a browser, select "Profile all requests", then "Record!". Blackfire will instrument all requests until you click on the "Stop" button in the pop-over.
A pop-over window will open at the bottom right of your screen, where all profiled requests will be listed.
All PHP requests which have been profiled will be shown on your dashboard.