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184 lines
8.5 KiB
C
184 lines
8.5 KiB
C
/*
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* Copyright (C) 2016-2020 Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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/* benchfn :
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* benchmark any function on a set of input
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* providing result in nanoSecPerRun
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* or detecting and returning an error
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*/
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#if defined (__cplusplus)
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extern "C" {
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#endif
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#ifndef BENCH_FN_H_23876
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#define BENCH_FN_H_23876
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/* === Dependencies === */
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#include <stddef.h> /* size_t */
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/* ==== Benchmark any function, iterated on a set of blocks ==== */
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/* BMK_runTime_t: valid result return type */
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typedef struct {
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double nanoSecPerRun; /* time per iteration (over all blocks) */
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size_t sumOfReturn; /* sum of return values */
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} BMK_runTime_t;
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/* BMK_runOutcome_t:
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* type expressing the outcome of a benchmark run by BMK_benchFunction(),
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* which can be either valid or invalid.
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* benchmark outcome can be invalid if errorFn is provided.
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* BMK_runOutcome_t must be considered "opaque" : never access its members directly.
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* Instead, use its assigned methods :
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* BMK_isSuccessful_runOutcome, BMK_extract_runTime, BMK_extract_errorResult.
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* The structure is only described here to allow its allocation on stack. */
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typedef struct {
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BMK_runTime_t internal_never_ever_use_directly;
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size_t error_result_never_ever_use_directly;
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int error_tag_never_ever_use_directly;
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} BMK_runOutcome_t;
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/* prototypes for benchmarked functions */
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typedef size_t (*BMK_benchFn_t)(const void* src, size_t srcSize, void* dst, size_t dstCapacity, void* customPayload);
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typedef size_t (*BMK_initFn_t)(void* initPayload);
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typedef unsigned (*BMK_errorFn_t)(size_t);
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/* BMK_benchFunction() parameters are provided via the following structure.
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* A structure is preferable for readability,
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* as the number of parameters required is fairly large.
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* No initializer is provided, because it doesn't make sense to provide some "default" :
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* all parameters must be specified by the caller.
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* optional parameters are labelled explicitly, and accept value NULL when not used */
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typedef struct {
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BMK_benchFn_t benchFn; /* the function to benchmark, over the set of blocks */
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void* benchPayload; /* pass custom parameters to benchFn :
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* (*benchFn)(srcBuffers[i], srcSizes[i], dstBuffers[i], dstCapacities[i], benchPayload) */
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BMK_initFn_t initFn; /* (*initFn)(initPayload) is run once per run, at the beginning. */
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void* initPayload; /* Both arguments can be NULL, in which case nothing is run. */
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BMK_errorFn_t errorFn; /* errorFn will check each return value of benchFn over each block, to determine if it failed or not.
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* errorFn can be NULL, in which case no check is performed.
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* errorFn must return 0 when benchFn was successful, and >= 1 if it detects an error.
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* Execution is stopped as soon as an error is detected.
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* the triggering return value can be retrieved using BMK_extract_errorResult(). */
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size_t blockCount; /* number of blocks to operate benchFn on.
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* It's also the size of all array parameters :
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* srcBuffers, srcSizes, dstBuffers, dstCapacities, blockResults */
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const void *const * srcBuffers; /* read-only array of buffers to be operated on by benchFn */
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const size_t* srcSizes; /* read-only array containing sizes of srcBuffers */
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void *const * dstBuffers; /* array of buffers to be written into by benchFn. This array is not optional, it must be provided even if unused by benchfn. */
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const size_t* dstCapacities; /* read-only array containing capacities of dstBuffers. This array must be present. */
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size_t* blockResults; /* Optional: store the return value of benchFn for each block. Use NULL if this result is not requested. */
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} BMK_benchParams_t;
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/* BMK_benchFunction() :
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* This function benchmarks benchFn and initFn, providing a result.
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*
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* params : see description of BMK_benchParams_t above.
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* nbLoops: defines number of times benchFn is run over the full set of blocks.
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* Minimum value is 1. A 0 is interpreted as a 1.
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*
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* @return: can express either an error or a successful result.
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* Use BMK_isSuccessful_runOutcome() to check if benchmark was successful.
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* If yes, extract the result with BMK_extract_runTime(),
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* it will contain :
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* .sumOfReturn : the sum of all return values of benchFn through all of blocks
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* .nanoSecPerRun : time per run of benchFn + (time for initFn / nbLoops)
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* .sumOfReturn is generally intended for functions which return a # of bytes written into dstBuffer,
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* in which case, this value will be the total amount of bytes written into dstBuffer.
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*
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* blockResults : when provided (!= NULL), and when benchmark is successful,
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* params.blockResults contains all return values of `benchFn` over all blocks.
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* when provided (!= NULL), and when benchmark failed,
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* params.blockResults contains return values of `benchFn` over all blocks preceding and including the failed block.
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*/
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BMK_runOutcome_t BMK_benchFunction(BMK_benchParams_t params, unsigned nbLoops);
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/* check first if the benchmark was successful or not */
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int BMK_isSuccessful_runOutcome(BMK_runOutcome_t outcome);
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/* If the benchmark was successful, extract the result.
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* note : this function will abort() program execution if benchmark failed !
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* always check if benchmark was successful first !
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*/
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BMK_runTime_t BMK_extract_runTime(BMK_runOutcome_t outcome);
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/* when benchmark failed, it means one invocation of `benchFn` failed.
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* The failure was detected by `errorFn`, operating on return values of `benchFn`.
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* Returns the faulty return value.
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* note : this function will abort() program execution if benchmark did not failed.
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* always check if benchmark failed first !
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*/
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size_t BMK_extract_errorResult(BMK_runOutcome_t outcome);
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/* ==== Benchmark any function, returning intermediate results ==== */
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/* state information tracking benchmark session */
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typedef struct BMK_timedFnState_s BMK_timedFnState_t;
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/* BMK_benchTimedFn() :
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* Similar to BMK_benchFunction(), most arguments being identical.
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* Automatically determines `nbLoops` so that each result is regularly produced at interval of about run_ms.
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* Note : minimum `nbLoops` is 1, therefore a run may last more than run_ms, and possibly even more than total_ms.
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* Usage - initialize timedFnState, select benchmark duration (total_ms) and each measurement duration (run_ms)
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* call BMK_benchTimedFn() repetitively, each measurement is supposed to last about run_ms
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* Check if total time budget is spent or exceeded, using BMK_isCompleted_TimedFn()
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*/
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BMK_runOutcome_t BMK_benchTimedFn(BMK_timedFnState_t* timedFnState,
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BMK_benchParams_t params);
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/* Tells if duration of all benchmark runs has exceeded total_ms
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*/
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int BMK_isCompleted_TimedFn(const BMK_timedFnState_t* timedFnState);
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/* BMK_createTimedFnState() and BMK_resetTimedFnState() :
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* Create/Set BMK_timedFnState_t for next benchmark session,
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* which shall last a minimum of total_ms milliseconds,
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* producing intermediate results, paced at interval of (approximately) run_ms.
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*/
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BMK_timedFnState_t* BMK_createTimedFnState(unsigned total_ms, unsigned run_ms);
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void BMK_resetTimedFnState(BMK_timedFnState_t* timedFnState, unsigned total_ms, unsigned run_ms);
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void BMK_freeTimedFnState(BMK_timedFnState_t* state);
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/* BMK_timedFnState_shell and BMK_initStatic_timedFnState() :
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* Makes it possible to statically allocate a BMK_timedFnState_t on stack.
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* BMK_timedFnState_shell is only there to allocate space,
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* never ever access its members.
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* BMK_timedFnState_t() actually accepts any buffer.
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* It will check if provided buffer is large enough and is correctly aligned,
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* and will return NULL if conditions are not respected.
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*/
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#define BMK_TIMEDFNSTATE_SIZE 64
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typedef union {
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char never_access_space[BMK_TIMEDFNSTATE_SIZE];
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long long alignment_enforcer; /* must be aligned on 8-bytes boundaries */
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} BMK_timedFnState_shell;
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BMK_timedFnState_t* BMK_initStatic_timedFnState(void* buffer, size_t size, unsigned total_ms, unsigned run_ms);
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#endif /* BENCH_FN_H_23876 */
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#if defined (__cplusplus)
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}
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#endif
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