问题
How can I profile a Java Native Interface library written in C?
I know about the usual C profilers, but my question is how can I profile the whole set including the calls to the JVM methods which might be slowing down the program.
回答1:
After some research and testing with some of the methods proposed here I ended up using sprof.
Basically I followed the instructions available in this answer. Some comments:
- I had to leave
LD_PROFILE_OUTPUTempty in order to get the result in/var/tmp/, otherwise the output file was not generated. - I assigned
LD_PROFILE=libXXXX.so
To get the profile I ran the Java code which loads and uses the native JNI library and I got a file with the profiling results in:
/var/tmp/libXXXX.so.profile
Once you have the file you can read it using the command:
sprof /path/to/libXXXX.so /var/tmp/libXXXX.so.profile
The results of the profiling follow the same template as gprof. Here you can find a description of the contents and their meaning.
来源：https://stackoverflow.com/questions/14752459/how-to-profile-native-jni-library