httpclient.stp

global allocations

probe process("rbx").mark("object__allocate")
{
    klass = user_string($arg1)
    file  = user_string($arg2)

    if ( isinstr(file, "httpclient") )
        allocations[klass, file] <<< 1
}

probe end
{
    printf("%-40s %-6s %s\n", "Class", "Amount", "File")

    foreach ( [klass, file] in allocations- )
    {
        printf("%-40s %-6d %s\n", klass, @count(allocations[klass, file]), file)
    }

    delete allocations
}

output.txt

$ sudo -E stap /tmp/rbx.stp -c 'rbx /tmp/test.rb'
WARNING: Kernel function symbol table missing [man warning::symbols]
Class                                    Amount File
String                                   310    /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient/session.rb
String                                   78     /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient/http.rb
String                                   57     /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient.rb
String                                   51     /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient/auth.rb
HTTPClient::NegotiateAuth                16     /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient/auth.rb
String                                   14     /home/yorickpeterse/.gem/rbx/2.1.0/specifications/httpclient-2.5.3.2.gemspec
HTTPClient::Site                         13     /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient/session.rb
String                                   10     /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient/cookie.rb
String                                   8      /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient/util.rb
HTTPClient::SSPINegotiateAuth            8      /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient/auth.rb
HTTP::Message::Body                      8      /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient/http.rb
HTTP::Message::Headers                   8      /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient/http.rb
String                                   5      /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient/ssl_config.rb
WebAgent::CookieManager                  4      /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient.rb
HTTPClient::WWWAuth                      4      /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient.rb
HTTPClient::Connection                   4      /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient.rb
HTTPClient::ProxyDigestAuth              4      /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient/auth.rb
HTTPClient::SSLConfig                    4      /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient.rb
HTTPClient::Session                      4      /home/yorickpeterse/.gem/rbx/2.1.0/gems/httpclient-2.5.3.2/lib/httpclient/session.rb

test.rb

require 'httpclient'

4.times do
  HTTPClient.get('http://httpbin.org/get', :follow_redirect => true)
end