:sig
DValue request_perf()

:params
return value : performance snapshot for the active request/workspace

:see
>sys
>time_precise

:content
Returns a DValue with timing and process metadata such as worker pid, parent pid, request count, request start times, and workspace birth timing when available.

:example
DValue perf = request_perf();
print(perf.get_type_name() != "invalid" ? "captured a timing snapshot" : "no data", "\n");
