This is a follow up question of "intel vtune to profile sgx application".
https://community.intel.com/t5/Intel-Software-Guard-Extensions/intel-vtune-to-profile-sgx-application/m-p/1344450/emcs_t/S2h8ZW1haWx8dG9waWNfc3Vic2NyaXB0aW9ufEtYODZVRU9FVFkzNFJEfDEzNDQ0NTB8U1VCU0NSSVBUSU9OU3xoSw#M5069
My real program is complicated and I have to use attaching to a process to profile. There is no way that I can run my program directly from VTune.
I find that starting the application from VTune directly would give a different result than attaching VTune to a process.
I modify the SampleEnclave example a little bit.
I add the following code to Enclave.cpp.
void func1() {
printf("in func1\n");
for (int i = 0; i < 1000000000; i++) {}
}
void func2() {
printf("in func2\n");
for (int i = 0; i < 1000000000; i++) {}
}
void enc_loop() {
printf("in the loop\n");
func1();
func2();
}
I add the following code to App.cpp. I get the pid and attach the VTune to the program, then I enter a character to let the enclave program continue to run.
printf("Enter a character to start, %d\n", (int)syscall(SYS_gettid));
getchar();
enc_loop(global_eid);
If I directly run the application from VTune, I would get the following result
Top Hotspots
Function Module Precise Clockticks
------------------- ----------------- ------------------
func1 enclave.signed.so 13,236,680,000
func2 enclave.signed.so 13,210,000,000
mutex_spin_on_owner vmlinux 150,400,000
do_ocall enclave.signed.so 115,160,000
sgx_spin_lock enclave.signed.so 104,420,000
[Others] N/A 337,860,000
If I attaching VTune to the process, I would get the following result. The func1 and func2 are not shown in the profile result.
Top Hotspots
Function Module Precise Clockticks
-------------------------- ------------------------ ------------------
__morestack libsgx_urts.so.1.1.103.3 14,380,000
[Outside any known module] [Unknown] 4,820,000
unmap_page_range vmlinux 540,000
find_get_entries vmlinux 500,000
free_pcppages_bulk vmlinux 300,000
[Others] N/A 4,920,000
