add libthapi-ctl to start/stop collecting #233
Commits on Jul 22, 2024
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- has two function, thapi_start_tracing, thapi_stop_tracing - requires liblttng-ctl - adds iprof option --(no)-profile-from-start, default profile from start - puts events in two different sessions, 'main' and 'bookkeeping', each in it's own subdir - start/stop affect the main session only, bookkeeping is always enabled - so far only opencl backend separates out bookkeeping events; other backends put everything in main (TODO)
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libthapi-ctl: logging with THAPI_CTL_LOG_LEVEL
- Uses env var, default is 1=ERROR - 0=disabled, 2=WARN, 3=INFO, 4=DEBUG - Under the default log level, no message will be printed when THAPI_LTTNG_SESSION_ID is not set (application is linked with libthapi-ctl and calls start or stop tracing, but not run with iprof).
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