add cpu caching tester.
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49
.drone.yml
49
.drone.yml
@ -1,24 +1,27 @@
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kind: pipeline
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name: default
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steps:
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- name: test
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image: gcc:latest
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commands:
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- g++ hello.cpp -o hello && ./hello
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- cd class || exit
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- g++ construct.cpp -o construct && ./construct
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- g++ inherit.cpp -o inherit && ./inherit
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- cd -
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- cd stl || exit
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- g++ map.cpp -o map && ./map
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- cd -
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- cd interview || exit
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- g++ memcache.cpp -o memcache && ./memcache
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- cd -
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- cd misc || exit
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- g++ sizeof.cpp -o sizeof && ./sizeof
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kind: pipeline
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name: default
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steps:
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- name: test
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image: gcc:latest
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commands:
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- g++ hello.cpp -o hello && ./hello
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- cd class || exit
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- g++ construct.cpp -o construct && ./construct
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- g++ inherit.cpp -o inherit && ./inherit
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- cd -
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- cd stl || exit
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- g++ map.cpp -o map && ./map
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- cd -
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- cd interview || exit
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- g++ memcache.cpp -o memcache && ./memcache
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- cd -
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- cd misc || exit
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- g++ sizeof.cpp -o sizeof && ./sizeof
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- g++ caching.cpp -o caching && ./caching
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- echo "following program fails to show the effect of 'likely' due to CPU branch predictor."
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- g++ likely.cpp -o likely && ./likely
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- cd -
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53
misc/caching.cpp
Normal file
53
misc/caching.cpp
Normal file
@ -0,0 +1,53 @@
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#include <iostream>
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#include <sys/time.h>
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#include <random>
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using namespace std;
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const int SIZE = 256 * 1024 * 1024;
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const int pagenum = 16 * 1024;
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const int pagesize = SIZE / pagenum;
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void xorsum_seq(int *data)
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{
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int xorsum = 0;
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timeval start, end;
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gettimeofday(&start, nullptr);
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for (int page = 0; page < pagenum; page++)
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{
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for (int idx = 0; idx < pagesize; idx++)
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xorsum ^= data[page * pagesize + idx];
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}
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gettimeofday(&end, nullptr);
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double usec = (end.tv_sec - start.tv_sec) + (double)(end.tv_usec - start.tv_usec) / 1000000;
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cout << __func__ << " duration: " << usec << ", xorsum: " << xorsum << endl;
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}
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void xorsum_jmp(int *data)
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{
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int xorsum = 0;
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timeval start, end;
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gettimeofday(&start, nullptr);
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for (int idx = 0; idx < pagesize; idx++)
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{
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for (int page = 0; page < pagenum; page++)
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xorsum ^= data[page * pagesize + idx];
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}
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gettimeofday(&end, nullptr);
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double usec = (end.tv_sec - start.tv_sec) + (double)(end.tv_usec - start.tv_usec) / 1000000;
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cout << __func__ << " duration: " << usec << ", xorsum: " << xorsum << endl;
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}
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int main()
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{
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int *data = new int[SIZE];
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int xorsum = 0;
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srand(time(nullptr));
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for (int idx = 0; idx < SIZE; idx++)
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{
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data[idx] = rand();
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}
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xorsum_seq(data);
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xorsum_jmp(data);
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}
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