Escript to show that how to have more than one histogram active at one time

simple2.erl

#!/usr/bin/env escript
%%! -sname hdr_histogram_simple -pa ebin

%% H1
%%  Memory Size 90184
%%  Total Count 100
%% H2
%%  Memory Size 90184
%%  Total Count 1000
%% Done!

-mode(compile).

loop(_,0) -> ok;
loop(R,X) -> hdr_histogram:record(R,random:uniform(1000000)), loop(R,X-1).

main(_) ->
    {ok,R1} = hdr_histogram:open(1000000,3),
    {ok,R2} = hdr_histogram:open(1000000,3),
    N1 = 100, 
    N2 = 1000,

    loop(R1, N1),
    loop(R2, N2),

    io:format("H1~n"),
    io:format(" Memory Size ~p~n", [hdr_histogram:get_memory_size(R1)]),
    io:format(" Total Count ~p~n", [hdr_histogram:get_total_count(R1)]),

    io:format("H2~n"),
    io:format(" Memory Size ~p~n", [hdr_histogram:get_memory_size(R2)]),
    io:format(" Total Count ~p~n", [hdr_histogram:get_total_count(R2)]),

    %% we're done, cleanup any held resources
    hdr_histogram:close(R1),
    hdr_histogram:close(R2),

    io:format("Done!\n").