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feat(profiler): added option to cmake build to configure NUM_WORKERS #448

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Nov 24, 2023
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feat(profiler): added option to cmake build to configure NUM_WORKERS #448

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3 changes: 3 additions & 0 deletions docs/Manual_Quickstart/Manual_Setup.md
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Expand Up @@ -45,8 +45,11 @@ If you have installed LLVM <b>using the package manager</b>, specifying this var
Note: In case you want to use a specific Version of LLVM, it is possible to specify the `-DUSE_LLVM_VERSION=<version>` flag.

Note: In case your application uses PThreads, please specify `-DDP_PTHREAD_COMPATIBILITY_MODE=1`. Note, however, that this can influence the runtime of the profiling.

Note: In case you require a more verbose output of the runtime library, specify the `-DDP_RTLIB_VERBOSE=1` flag.

Note: In case you want to specify the number of Workers available for the profiling step, specify the `-DDP_NUM_WORKERS=<int>` flag.

Once the configuration process is successfully finished, compile the DiscoPoP libraries using `make`. All created shared objects will be stored in the build directory and can be found inside a folder named `libi/`.

make
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7 changes: 7 additions & 0 deletions rtlib/CMakeLists.txt
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Expand Up @@ -39,6 +39,13 @@ if(DEFINED DP_RTLIB_VERBOSE)
target_compile_definitions(DiscoPoP_RT PUBLIC DP_RTLIB_VERBOSE=${DP_RTLIB_VERBOSE})
endif()
endif()

if(DEFINED DP_NUM_WORKERS)
if(NOT ${DP_NUM_WORKERS} EQUAL 0)
target_compile_definitions(DiscoPoP_RT PUBLIC DP_NUM_WORKERS=${DP_NUM_WORKERS})
endif()
endif()

# end of compiler flags

install(TARGETS DiscoPoP_RT ARCHIVE DESTINATION lib)
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7 changes: 7 additions & 0 deletions rtlib/iFunctions.cpp
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Expand Up @@ -91,7 +91,14 @@ namespace __dp {
pthread_mutex_t allDepsLock;
pthread_t *workers = nullptr; // worker threads

#define XSTR(x) STR(x)
#define STR(x) #x
#ifdef DP_NUM_WORKERS
#pragma message "Profiler: set NUM_WORKERS to " XSTR(DP_NUM_WORKERS)
int32_t NUM_WORKERS = DP_NUM_WORKERS;
#else
int32_t NUM_WORKERS = 3; // default number of worker threads (multiple workers can potentially lead to non-deterministic results)
#endif
int32_t CHUNK_SIZE = 500; // default number of addresses in each chunk
queue<AccessInfo *> *chunks = nullptr; // one queue of access info chunks for each worker thread
bool *addrChunkPresent = nullptr; // addrChunkPresent[thread_id] denotes whether or not a new chunk is available for the corresponding thread
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