diff options
| -rw-r--r-- | applause.lua | 38 |
1 files changed, 33 insertions, 5 deletions
diff --git a/applause.lua b/applause.lua index c2d8c34..423268a 100644 --- a/applause.lua +++ b/applause.lua @@ -1,13 +1,41 @@ -posix = require "posix" +local ffi = require "ffi" + +-- +-- Define C functions for benchmarking (POSIX libc) +-- +ffi.cdef[[ +typedef long time_t; + +struct timespec { + time_t tv_sec; /* seconds */ + long tv_nsec; /* nanoseconds */ +}; + +typedef enum { + CLOCK_REALTIME = 0, + CLOCK_MONOTONIC = 1, + CLOCK_PROCESS_CPUTIME_ID = 2, + CLOCK_THREAD_CPUTIME_ID = 3, + CLOCK_MONOTONIC_RAW = 4, + CLOCK_REALTIME_COARSE = 5, + CLOCK_MONOTONIC_COARSE = 6, + CLOCK_BOOTTIME = 7 +} clockid_t; + +int clock_gettime(clockid_t clk_id, struct timespec *tp); +]] -- measure time required to execute fnc() function benchmark(fnc) - local t1_s, t1_ns = posix.clock_gettime("process_cputime_id") + local t1 = ffi.new("struct timespec[1]") + local t2 = ffi.new("struct timespec[1]") + + ffi.C.clock_gettime("CLOCK_PROCESS_CPUTIME_ID", t1) fnc() - local t2_s, t2_ns = posix.clock_gettime("process_cputime_id") + ffi.C.clock_gettime("CLOCK_PROCESS_CPUTIME_ID", t2) - local t1_ms = t1_s*1000 + t1_ns/1000000 - local t2_ms = t2_s*1000 + t2_ns/1000000 + local t1_ms = t1[0].tv_sec*1000 + t1[0].tv_nsec/1000000 + local t2_ms = t2[0].tv_sec*1000 + t2[0].tv_nsec/1000000 print("Elapsed CPU time: "..(t2_ms - t1_ms).."ms") end |