http://man7.org/linux/man-pages/man3/clock.3.html contains: In glibc 2.17 and earlier, clock() was implemented on top of times(2). For improved precision, since glibc 2.18, it is ^^^^^^^^^^^^^^^^^^ implemented on top of clock_gettime(2) (using the CLOCK_PROCESS_CPUTIME_ID clock). This looks strange. The user doesn't seek improved precision, but improved accuracy: if one gets more digits but the value itself is less accurate (i.e. the error against the ideal value is larger), this is bad. Perhaps changing "precision" to "accuracy" would be correct (I assume that the real goal of the change was not just improved precision, but more importantly the resulting improved accuracy). I've reported a bug about the glibc documentation: https://sourceware.org/bugzilla/show_bug.cgi?id=17383 -- Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon) -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
