• Austin Clements's avatar
    runtime: reduce Windows timer resolution when idle · 11eaf428
    Austin Clements authored
    Currently Go sets the system-wide timer resolution to 1ms the whole
    time it's running. This has negative affects on system performance and
    power consumption. Unfortunately, simply reducing the timer resolution
    to the default 15ms interferes with several sleeps in the runtime
    itself, including sysmon's ability to interrupt goroutines.
    
    This commit takes a hybrid approach: it only reduces the timer
    resolution when the Go process is entirely idle. When the process is
    idle, nothing needs a high resolution timer. When the process is
    non-idle, it's already consuming CPU so it doesn't really matter if
    the OS also takes timer interrupts more frequently.
    
    Updates #8687.
    
    Change-Id: I0652564b4a36d61a80e045040094a39c19da3b06
    Reviewed-on: https://go-review.googlesource.com/38403
    Run-TryBot: Austin Clements <austin@google.com>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: 's avatarAlex Brainman <alex.brainman@gmail.com>
    Reviewed-by: 's avatarDmitry Vyukov <dvyukov@google.com>
    11eaf428
os_windows.go 24.7 KB