Page Comparison

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Code Block

title	Listing 2: Aggregation using a callback in MasterServer.cc that gets invoked via objectMap.forEach()

/**
* Aggregation Callback
*/
void
aggregateCallback(LogEntryHandle handle, uint8_t type,
                      void *cookie)
{
        const Object* obj = handle->userData<Object>();
        MasterServer *server = reinterpret_cast<MasterServer*>(cookie);

        int *p;
        p = (int*) obj->data;
        server->sum += (uint64_t)*p;
}

ssBenchmarking

#number of objects	client-side aggregation	server-side aggregation via hashtable lookup	server-side aggregation via hashtable forEach
10.000	75 ms	2 ms	238 ms
100.000	766 ms	23 ms	251 ms
1.000.000	7604 ms	233 ms	369 ms
10.000.000	76515 ms	2662 ms	1444 ms
100.000.000	770761 ms	30049 ms	18752 ms

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Versions Compared

Old Version 26

New Version 27

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