Created
June 22, 2021 08:57
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Process Info Checker - v3
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| -module(pi). | |
| -format #{paper => 80}. | |
| -export([check/0]). | |
| check() -> | |
| Pid = spawn(fun wait/0), | |
| erlang:yield(), | |
| Items = | |
| [backtrace, binary, catchlevel, current_function, current_location, | |
| current_stacktrace, dictionary, error_handler, garbage_collection, | |
| garbage_collection_info, group_leader, heap_size, initial_call, links, | |
| last_calls, memory, message_queue_len, messages, min_heap_size, | |
| min_bin_vheap_size, monitored_by, monitors, message_queue_data, | |
| priority, reductions, registered_name, sequential_trace_token, | |
| stack_size, status, suspending, total_heap_size, trace, trap_exit], | |
| CostlyBits = [Item || Item <- Items, reduction_increase(Item, Pid) > 0], | |
| [{reductions, R1} | _] = erlang:process_info(Pid, [reductions | CostlyBits]), | |
| [{reductions, R2} | _] = erlang:process_info(Pid, [reductions | CostlyBits]), | |
| Pid ! stop, | |
| R2 - R1. | |
| reduction_increase(Item, Pid) -> | |
| [{reductions, R1}, {Item, Value}] = | |
| erlang:process_info(Pid, [reductions, Item]), | |
| [{reductions, R2}, {Item, Value}] = | |
| erlang:process_info(Pid, [reductions, Item]), | |
| R2 - R1. | |
| wait() -> | |
| receive | |
| stop -> | |
| ok | |
| end. |
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