On 5 Dec 2012, at 15:57, Joar Wingfors <[email protected]> wrote:
> What happens if you remove the "isCancelled" checks?
No effect on blocking.
> How do you create your operation queue?
if ( self.operationQueue == nil )
{
self.operationQueue = [ [ NSOperationQueue alloc ] init ];
#ifdef OBSERVE_OPERATION_COUNT <-- has no effect on blocking
[ self.operationQueue addObserver: self
forKeyPath:
kOperationCount
options:
0
context:
(__bridge void *)kOperationCount
];
#endif
}
else
{
[ self.operationQueue cancelAllOperations ];
};
> What is the max concurrent operation count of the queue? If
> NSOperationQueueDefaultMaxConcurrentOperationCount, what happens if you set
> it to (processorCount) instead?
With (processorCount) it does no longer block. Very strange. This I did not
expect at all.
With NSOperationQueueDefaultMaxConcurrentOperationCount the app gets blocked
with more than 8 operations.
> When you take a CPU sample of the process, what are your worker threads
> mainly doing (work, or being stuck)?
All seem to be in in their main method busy adding square-roots.
>>
>>
>> I made a test project with this Operation:
>>
>> @implementation GmdOperationBasis
>> - (void)main
>> {
>> if ( [ self isCancelled ] ) return;
>> double sum = 8;
>> for( NSUInteger i = 0; i < 133833333; i++ )
>> {
>> if ( [ self isCancelled ] ) return;
>> double j = (double)i;
>> sum += sqrt(j);
>> };
>> }
>> @end
>>
>> When I add less than 8 operations to the queue, all is fine.
>>
>> When I add 8 or more operations to NSOperationQueue (using
>> NSOperationQueueDefaultMaxConcurrentOperationCount concurrent ops) ,
>> - then switch to some other app,
>> - then try to make my app active again, I get a beach-ball.
>>
>> My app becomes responsive again, when all operations have finished.
>>
>> processorCount = 8 (as reported by NSProcessInfo).
>>
>> 10.8.2. Xcode 4.5.2.
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