In `go1.9 @ linux 3.10.0-327.el7.x86_64`, the call __vdso_clock_gettime_sym is completely in userspace, and does not involve any syscall in the kernel, and that is the reason __vdso_clock_gettime_sym with CLOCK_MONOTONIC is so fast. ( In C, the perf of __vdso_clock_gettime_sym is about 14,000,000 op/s, it drops to nearly 7,000,000 op/s in golang's implementation. )
On Mon, Sep 18, 2017 at 5:28 AM, David Collier-Brown <davecb...@gmail.com> wrote: > You may need to look and see what __vdso_clock_gettime_sym calls at the > system-call level, and compare that with the system calls reported by > strace from your executable. > > I assume you want some particular thing that __vdso_clock_gettime_sym > does: try asking the folks about *that*, as they may already know. > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
