commit e0809ec5f5de4c3d22527425bf6253843044e1b2 Author: Nick Mathewson <nickm@torproject.org> Date: Mon Apr 9 15:21:10 2018 -0400 Prefer 32-bit implementation for timing wheels on 32-bit systems. This might make our timing-wheel code a tiny bit faster there. Closes ticket 24688. --- changes/bug24688 | 3 +++ src/common/timers.c | 5 +++++ 2 files changed, 8 insertions(+) diff --git a/changes/bug24688 b/changes/bug24688 new file mode 100644 index 000000000..c376fe6a0 --- /dev/null +++ b/changes/bug24688 @@ -0,0 +1,3 @@ + o Minor features (performance, 32-bit): + - Make our timing-wheel code run a tiny bit faster on 32-bit platforms, + by preferring 32-bit math to 64-bit. Closes ticket 24688. diff --git a/src/common/timers.c b/src/common/timers.c index a90817da1..6f6236ed3 100644 --- a/src/common/timers.c +++ b/src/common/timers.c @@ -64,6 +64,11 @@ struct timeout_cb { * above TIMEOUT_MAX can also be super-inefficient. Choosing 5 here sets * timeout_max to 2^30 ticks, or 29 hours with our value for USEC_PER_TICK */ #define WHEEL_NUM 5 +#if SIZEOF_VOID_P == 4 +/* On 32-bit platforms, we want to override wheel_bit, so that timeout.c will + * use 32-bit math. */ +#define WHEEL_BIT 5 +#endif #include "src/ext/timeouts/timeout.c" static struct timeouts *global_timeouts = NULL;