Hi,
I did a simple experiment to profile the performance of dynamic linking vs
static linking and found that dynamic linking is 10x slower than static
linking. Is this slowdown expected for dynamic linking?
This is my main.cpp:
---------------------------------------------------------------------------------------------------------------------
#include <stdio.h>
#include <chrono>
#include <iostream>
using namespace std;
using namespace std::chrono;
class input {
public:
int* m_test;
};
extern int sidey(input object, char* str, int num);
int main() {
input i; i.m_test = new int(7);
char* str = (char*)"test string to side";
printf("hello from main\n");
int count = 0, ret = 0;
high_resolution_clock::time_point t1 = high_resolution_clock::now();
do {
ret = sidey(i, str, 10);
} while (count++<1000000000);
high_resolution_clock::time_point t2 = high_resolution_clock::now();
auto duration = duration_cast<milliseconds>(t2-t1).count();
cout << "Total duration:" << duration << endl;
return ret;
}
This is my side.cpp:
---------------------------------------------------------------------------------------------------------------------
#include <stdio.h>
class input {
public:
int* m_test;
};
int sidey(input i, char* str, int num) {
return *i.m_test + num + (int)str;
}
This is my link.js:
---------------------------------------------------------------------------------------------------------------------
var Module = {
dynamicLibraries: ['side.wasm'],
};
These are my build parameters for dynamic linking:
emcc d:\git\dylink\main.cpp -O2 --profiling -o
d:\git\dylink\build/dybuild.js -s MAIN_MODULE=1 -s WASM=1 --pre-js
d:\git\dylink\link.js && emcc d:\git\dylink\side.cpp -O2 --profiling -o
d:\git\dylink\build/side.js -s SIDE_MODULE=1 -s WASM=1
This is static.cpp, the file that I use to link in a side.bc:
---------------------------------------------------------------------------------------------------------------------
#include <stdio.h>
#include <chrono>
#include <iostream>
using namespace std;
using namespace std::chrono;
class input {
public:
int* m_test;
};
extern int sidey(input object, char* str, int num);
int main() {
input i; i.m_test = new int(7);
char* str = (char*)"test string to side";
printf("hello from main\n");
int count = 0, ret = 0;
high_resolution_clock::time_point t1 = high_resolution_clock::now();
do {
ret = sidey(i, str, 10);
} while (count++<1000000000);
high_resolution_clock::time_point t2 = high_resolution_clock::now();
auto duration = duration_cast<milliseconds>(t2-t1).count();
cout << "Total duration:" << duration << endl;
return ret;
}
These are my build parameters for dynamic linking:
emcc d:\git\dylink\side.cpp -O2 --profiling -o d:\git\dylink\build/side.bc
&& emcc d:\git\dylink\static.cpp d:\git\dylink\build/side.bc -O2
--profiling -o d:\git\dylink\build/static.js -s WASM=1
side.cpp is the same as above.
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