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178 lines (162 loc) · 8.27 KB
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// Bubble-up method
// https://ieeexplore.ieee.org/document/7851476
#include "rbench.hpp"
#define MASK 0xd0000001u
#define rand_r ( lfsr = ( lfsr >> 1 ) ^ ( unsigned int )( ( 0 - ( lfsr & 1u ) ) & MASK ) )
static void OPTIMIZE3 cache_bench_rdacc_kernel( volatile char* block_aligned_ , uint32_t cache_size_ ){
#define OP_LIMIT 16383
register volatile char* block_aligned = block_aligned_ ;
register uint32_t cache_size = cache_size_ ;
static uint32_t lfsr = 1 ;
register uint32_t count = 0 ;
while( 1 ){
if( count > OP_LIMIT ) break ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
block_aligned[rand_r % cache_size] ++ ;
count += 20 ;
}
#undef OP_LIMIT
// block_aligned[0] += block_aligned[20] ;
}
static void cache_bench_rand_access_module( int32_t thrid , bench_args_t args , uint32_t cache_line_size ){
char volatile *block , *block_aligned ;
char infobuf[1024] ;
// Cache size range check
uint32_t cache_size = (uint32_t) args.cache_size , cache_align = cache_line_size ;
if( cache_size != args.cache_size ){
sprintf( infobuf , "%s( thread %d ): The given cache size %llu exceeds the range of uint32_t" ,
args.bench_name.c_str() , thrid , (unsigned long long) args.cache_size ) ;
pr_error( infobuf ) ;
return ;
}
// Allocate memory buffer for cache benchmark
block = (char*) mmap_with_retry( cache_size + cache_align ) ;
if( UNLIKELY( block == MAP_FAILED ) ){
sprintf( infobuf , "%s( thread %d ): mmap fails after retry, thread exits", args.bench_name.c_str() , thrid ) ;
pr_error( infobuf ) ;
return ;
}
block_aligned = block + cache_align - (uintptr_t)block % cache_align ;
// Calculate load parameters
double md_thr_cpu_t_start = thread_time_now() , md_t_start = time_now() ;
int measure_rounds = std::min( std::max( int( 1000000000ll / cache_size ) , 500 ) , 5000 ) ;
for( int i = 1 ; i <= measure_rounds ; i ++ ){
cache_bench_rdacc_kernel( block_aligned , cache_size ) ;
}
double md_thr_cpu_t_end = thread_time_now() , md_t_end = time_now() ;
double actl_runt = md_thr_cpu_t_end - md_thr_cpu_t_start , sgl_time = actl_runt / measure_rounds ,
run_idlet = md_t_end - md_t_start - actl_runt , sgl_idle = run_idlet / measure_rounds ;
int32_t module_runrounds , module_sleepus ;
strength_to_time( sgl_time , sgl_idle , args.strength , args.period , module_runrounds , module_sleepus ) ;
// Run stressor
bool in_low_actl_strength_warning = false ;
int32_t round_cnt = 0 , time_limit = args.time , low_actl_strength_warning = 0 ;
int64_t knl_round_limit = get_arg_flag( args.flags , FLAG_IS_LIMITED ) ? args.limit_round : INT64_MAX ;
int64_t knl_round_sumup = 0 ;
double t_start = time_now() , sum_krounds = 0 , sum_sleepus = 0 , sum_runtimeus = 0 , sum_runidleus = 0 ;
while( true ){
round_cnt ++ ;
measure_rounds = module_runrounds ;
md_thr_cpu_t_start = thread_time_now() , md_t_start = time_now() ;
for( int i = 0 ; i < measure_rounds ; i ++ ){
cache_bench_rdacc_kernel( block_aligned , cache_size ) ;
}
md_thr_cpu_t_end = thread_time_now() , md_t_end = time_now() ;
actl_runt = md_thr_cpu_t_end - md_thr_cpu_t_start , run_idlet = md_t_end - md_t_start - actl_runt ;
sum_runtimeus += actl_runt * ONE_MILLION , sum_runidleus += run_idlet * ONE_MILLION ;
sum_krounds += measure_rounds ;
md_t_start = time_now() ;
std::this_thread::sleep_for (std::chrono::microseconds( module_sleepus ) );
md_t_end = time_now() ;
double actl_sleepus = ( md_t_end - md_t_start ) * ONE_MILLION ;
sum_sleepus += actl_sleepus ;
knl_round_sumup += measure_rounds ;
if( knl_round_sumup >= knl_round_limit ) break ;
if( time_limit && md_t_end - t_start >= time_limit ) break ;
// Load strength feedback regulation
if( !( round_cnt & 0x7 ) ){
sgl_time = sum_runtimeus * ONE_MILLIONTH / sum_krounds , sgl_idle = sum_runidleus * ONE_MILLIONTH / sum_krounds ;
double actual_strength = 100 * sum_runtimeus / ( sum_runtimeus + sum_sleepus + sum_runidleus ) ;
sprintf( infobuf , "%s( thread %d ): sgl_time = %.1fus, strength=%.1f, (runtime=%.1fus , sleeptime=%.1fus , idletime=%.1fus)" ,
args.bench_name.c_str() , thrid , sgl_time * ONE_MILLION , actual_strength , sum_runtimeus, sum_sleepus , sum_runidleus ) ;
pr_debug( infobuf ) ;
// re-calculate load parameters
if( args.strength - STRENGTH_CONTROL_LBOUND > actual_strength ||
args.strength + STRENGTH_CONTROL_RBOUND < actual_strength ){
strength_to_time( sgl_time , sgl_idle , args.strength , args.period , module_runrounds , module_sleepus ) ;
}
if( args.strength - 1 > actual_strength ){
if( ++low_actl_strength_warning > 8 ){
sprintf( infobuf , "LOW STRENGTH - %s( thread %d ): current %.1f%%, target %.1f%%, adjusting..." ,
args.bench_name.c_str() , thrid , actual_strength , (double)args.strength ) ;
pr_warning( infobuf ) ;
in_low_actl_strength_warning = true ;
low_actl_strength_warning = 0 ;
}
} else {
if( in_low_actl_strength_warning ){
sprintf( infobuf , "LOW STRENGTH - %s( thread %d ): adjustment succeed, current %.1f%%, target %.1f%%" ,
args.bench_name.c_str() , thrid , actual_strength , (double)args.strength ) ;
pr_warning( infobuf ) ;
}
in_low_actl_strength_warning = false ;
low_actl_strength_warning = 0 ;
}
sum_runtimeus -= ( sum_runtimeus ) / 5 , sum_krounds -= ( sum_krounds ) / 5 ;
sum_sleepus -= ( sum_sleepus ) / 5 , sum_runidleus -= ( sum_runidleus ) / 5 ;
}
}
sprintf( infobuf , "%s( thread %d ): stopped after %.3f seconds, %ld rounds" ,
args.bench_name.c_str() , thrid , time_now() - t_start , knl_round_sumup ) ;
pr_info( infobuf ) ;
// Deallocate the memory buffer
munmap( (void*)block , cache_size + cache_align ) ;
}
int32_t cache_bench_entry( bench_args_t args ){
int count_thr = args.threads ;
if( get_arg_flag( args.flags , FLAG_IS_CHECK ) ){
args.print_argsinfo() ;
}
// get cache line size
uint32_t cache_line_size = UNIVERSAL_CACHELINE ;
for( int i = 0 ; i < cpuinfo.cache_count ; i ++ ){
if( cpuinfo.caches[i].type == CACHE_TYPE_INSTRUCTION ) continue ;
if( args.cache_size > cpuinfo.caches[i].size ){
cache_line_size = cpuinfo.caches[i].line_size ;
}
}
// run stressors
vector<thread> thrs ;
thrs.resize( count_thr ) ;
for( int i = 0 ; i < count_thr ; i ++ ){
thrs[i] = thread( cache_bench_rand_access_module , i + 1 , args , cache_line_size ) ;
}
if( get_arg_flag( args.flags , FLAG_IS_RUN_PARALLEL ) ){
for( auto &thr : thrs ){
thr.swap( glob_threads[glob_thr_cnt++] ) ;
}
} else {
for( auto &thr : thrs ){
thr.join() ;
}
}
return 0 ;
}