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osd_work.c: only allocate main threads when WORK_QUEUE_FLAG_MULTI / some logging of thread count / fixed clang warning (nw)

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This commit is contained in:
Oliver Stöneberg 2015-01-06 11:20:29 +01:00
parent 7727ba546a
commit c41db9fdd1
1 changed files with 38 additions and 15 deletions
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53
src/osd/modules/sync/work_osd.c
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@ -76,6 +76,7 @@ typedef void *PVOID;
#endif
// TODO: move this in a common place
#if defined(OSD_WINDOWS)
#if __GNUC__ && defined(__i386__) && !defined(__x86_64)
#undef YieldProcessor
#endif
@ -95,6 +96,7 @@ INLINE void osd_yield_processor(void)
#else
#define osd_yield_processor YieldProcessor
#endif
#endif
template<typename _PtrType>
static void spin_while(const volatile _PtrType * volatile ptr, const _PtrType val, const osd_ticks_t timeout, const int invert = 0)
@ -203,9 +205,11 @@ static bool queue_has_list_items(osd_work_queue *queue);
osd_work_queue *osd_work_queue_alloc(int flags)
{
int threadnum;
int numprocs = effective_num_processors();
osd_work_queue *queue;
int threadnum;
int osdthreadnum = 0;
int allocthreadnum;
char *osdworkqueuemaxthreads = osd_getenv("OSDWORKQUEUEMAXTHREADS");
// allocate a new queue
@ -231,37 +235,44 @@ osd_work_queue *osd_work_queue_alloc(int flags)
// determine how many threads to create...
// on a single-CPU system, create 1 thread for I/O queues, and 0 threads for everything else
if (numprocs == 1)
queue->threads = (flags & WORK_QUEUE_FLAG_IO) ? 1 : 0;
threadnum = (flags & WORK_QUEUE_FLAG_IO) ? 1 : 0;
// TODO: chose either
#if defined(OSD_WINDOWS)
// on an n-CPU system, create n threads for multi queues, and 1 thread for everything else
else
queue->threads = (flags & WORK_QUEUE_FLAG_MULTI) ? numprocs : 1;
threadnum = (flags & WORK_QUEUE_FLAG_MULTI) ? numprocs : 1;
#else
// on an n-CPU system, create (n-1) threads for multi queues, and 1 thread for everything else
else
queue->threads = (flags & WORK_QUEUE_FLAG_MULTI) ? (numprocs - 1) : 1;
threadnum = (flags & WORK_QUEUE_FLAG_MULTI) ? (numprocs - 1) : 1;
#endif
if (osdworkqueuemaxthreads != NULL && sscanf(osdworkqueuemaxthreads, "%d", &threadnum) == 1 && queue->threads > threadnum)
queue->threads = threadnum;
if (osdworkqueuemaxthreads != NULL && sscanf(osdworkqueuemaxthreads, "%d", &osdthreadnum) == 1 && threadnum > osdthreadnum)
threadnum = osdthreadnum;
// TODO: do we still have the scaling problems?
#if defined(OSD_WINDOWS)
// multi-queues with high frequency items should top out at 4 for now
// since we have scaling problems above that
if ((flags & WORK_QUEUE_FLAG_HIGH_FREQ) && queue->threads > 1)
queue->threads = MIN(queue->threads - 1, 4);
if ((flags & WORK_QUEUE_FLAG_HIGH_FREQ) && threadnum > 1)
threadnum = MIN(threadnum - 1, 4);
#endif
// clamp to the maximum
queue->threads = MIN(queue->threads, WORK_MAX_THREADS);
queue->threads = MIN(threadnum, WORK_MAX_THREADS);
// allocate memory for thread array (+1 to count the calling thread)
queue->thread = (work_thread_info *)osd_malloc_array((queue->threads + 1) * sizeof(queue->thread[0]));
// allocate memory for thread array (+1 to count the calling thread if WORK_QUEUE_FLAG_MULTI)
if (flags & WORK_QUEUE_FLAG_MULTI)
allocthreadnum = queue->threads + 1;
else
allocthreadnum = queue->threads;
osd_printf_verbose("procs: %d threads: %d allocthreads: %d osdthreads: %d maxthreads: %d queuethreads: %d\n", osd_num_processors, threadnum, allocthreadnum, osdthreadnum, WORK_MAX_THREADS, queue->threads);
queue->thread = (work_thread_info *)osd_malloc_array(allocthreadnum * sizeof(queue->thread[0]));
if (queue->thread == NULL)
goto error;
memset(queue->thread, 0, (queue->threads + 1) * sizeof(queue->thread[0]));
memset(queue->thread, 0, allocthreadnum * sizeof(queue->thread[0]));
// iterate over threads
for (threadnum = 0; threadnum < queue->threads; threadnum++)
@ -290,7 +301,10 @@ osd_work_queue *osd_work_queue_alloc(int flags)
}
// start a timer going for "waittime" on the main thread
begin_timing(queue->thread[queue->threads].waittime);
if (flags & WORK_QUEUE_FLAG_MULTI)
{
begin_timing(queue->thread[queue->threads].waittime);
}
return queue;
error:
@ -372,7 +386,10 @@ void osd_work_queue_free(osd_work_queue *queue)
int threadnum;
// stop the timer for "waittime" on the main thread
end_timing(queue->thread[queue->threads].waittime);
if (queue->flags & WORK_QUEUE_FLAG_MULTI)
{
end_timing(queue->thread[queue->threads].waittime);
}
// signal all the threads to exit
atomic_exchange32(&queue->exiting, TRUE);
@ -400,8 +417,14 @@ void osd_work_queue_free(osd_work_queue *queue)
}
#if KEEP_STATISTICS
int allocthreadnum;
if (queue->flags & WORK_QUEUE_FLAG_MULTI)
allocthreadnum = queue->threads + 1;
else
allocthreadnum = queue->threads;
// output per-thread statistics
for (threadnum = 0; threadnum <= queue->threads; threadnum++)
for (threadnum = 0; threadnum <= allocthreadnum; threadnum++)
{
work_thread_info *thread = &queue->thread[threadnum];
osd_ticks_t total = thread->runtime + thread->waittime + thread->spintime;