I am trying to profile an SGX application on Ubuntu 18.04 LTS with Vtune profiler (Intel(R) VTune(TM) Profiler 2020 (build 605129)). I am trying to run hotspot analysis (based on Hardware Event-Based Sampling) for two different configurations of my application. 1) runs for under a minute 2) runs over 5 minutes. Between these configurations, the source code changes are minimal. During (1), everything looks good, vtune is able to capture all the information (including symbols of `enclave.signed.so`). When I run (2), vtune runs to completion, but refuses to resolve symbols present in `enclave.signed.so`. It is listed as [Outside any module] in the Bottom-up tree. When I dug in, I figured (by grepping thro the result directory for `enclave.signed.so`) that when (2) is run, vtune fails to produce the modmap file under `data.0` sub-directory of the result directory. The modmap seems to be a binary file with header 'ITT Collector API' and contains hostname, bunch of records and the absolute path of `enclave.signed.so`. Moreover, when finalizing the result, vtune did not complain on "Failed to create modmap file".
To understand better, I ran the (2) configuration and stopped collecting after a minute or so. Under this setting, modmap is generated. My observation is that: When run for a longer time, modmap file does not seem to be generated.
I dug through the known issues and could not find any issue related to my problem. Also tried profiling with sgx-hotspot analysis. This does not solve my modmap missing problem.
Any ideas would be much appreciated.