|
用的是创龙的OMAP-L138的板子和XDS100v3仿真器,用的方法是TSCL = 0;. r, w9 l& y. G& ~! v, x
TSCH = 0;
2 l" V: P+ m Y* A' K+ D( H: G unsigned long long start,stop,overhead;% W; B5 R0 V# g5 I6 r( W! Q( t
start = _itoll(TSCH,TSCL);
9 [) M$ D9 L. E( ]* K3 y9 A$ P stop = _itoll(TSCH,TSCL); % D4 Y' K) u0 ^$ F$ k/ T
B* ^; p$ L, S/ X* q* U. Aoverhead = stop - start;
" e5 C/ {! c% q0 ]4 U% @printf("overhead run-time is %d\n",overhead);
7 t$ F* L8 {2 [
. M% b# H0 L7 X' ?/ Z& I- rstart = _itoll(TSCH,TSCL);, Y* e- W4 g) H: O
//here is function! [' ^* ~$ @' S/ o: R7 u
function();
5 [$ S! g0 B7 ]5 R x, mstop = _itoll(TSCH,TSCL);$ Y6 O+ |6 k7 {4 f* R
printf("The function run-time time is %lu\n",(stop - start - overhead));
3 d- ~% b/ X/ x. T: {; Y: d. K$ u: h0 s3 d0 Q0 [
' @! f' o5 L$ T% h6 x) \
为什么每次测量出来的时间都不一致?测量出来的不是一个固定的值。
5 `; C/ ~" d5 Z7 f# G* i( u
7 {/ k3 O% m+ J2 f4 z1 ?( ] |
|