Time travel


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Get someone to help

Surely there should be someone in your business who can help, or hire an assistant who knows about this stuff if you get my drift.

Have you tried talking to IBM itself?, worth a try if you ask me.
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__PPC_GET_TIMEBASE(3)					     Linux Programmer'sManual					     __PPC_GET_TIMEBASE(3)

NAME
__ppc_get_timebase, __ppc_get_timebase_freq - get the current value of the Time Base Register on Power architecture and its frequency. SYNOPSIS
#include <sys/platform/ppc.h> uint64_t __ppc_get_timebase(void) uint64_t __ppc_get_timebase_freq(void); DESCRIPTION
__ppc_get_timebase() reads the current value of the Time Base Register and returns its value, while __ppc_get_timebase_freq() returns the frequency in which the Time Base Register is updated. The Time Base Register is a 64-bit register provided by Power Architecture processors. It stores a monotonically incremented value that is updated at a system-dependent frequency that may be different from the processor frequency. RETURN VALUE
__ppc_get_timebase() returns a 64-bit unsigned integer that represents the current value of the Time Base Register. __ppc_get_timebase_freq() returns a 64-bit unsigned integer that represents the frequency at which the Time Base Register is updated. VERSIONS
GNU C Library support for __ppc_get_timebase() has been provided since version 2.16 and __ppc_get_timebase_freq() has been available since version 2.17. CONFORMING TO
Both functions are nonstandard GNU extensions. EXAMPLE
The following program will calculate the time, in microseconds, spent between two calls to __ppc_get_timebase(). Program source #include <inttypes.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <sys/platform/ppc.h> /* Maximum value of the Time Base Register: 2^60 - 1. Source: POWER ISA. */ #define MAX_TB 0xFFFFFFFFFFFFFFF int main(void) { uint64_t tb1, tb2, diff; uint64_t freq = __ppc_get_timebase_freq(); printf("Time Base frequency = %"PRIu64" Hz ", freq); tb1 = __ppc_get_timebase(); // Do some stuff... tb2 = __ppc_get_timebase(); if (tb2 > tb1) { diff = tb2 - tb1; } else { /* Treat Time Base Register overflow. */ diff = (MAX_TB - tb2) + tb1; } printf("Elapsed time = %1.2f usecs ", (double) diff * 1000000 / freq ); exit(EXIT_SUCCESS); } SEE ALSO
time(2), usleep(3) GNU C Library 2019-03-06 __PPC_GET_TIMEBASE(3)

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