Hi All, I am struggling to make sense of a simple stress test I ran against the latest Cassandra 0.7. My server performs very poorly compared to a desktop and even a notebook.
Here is the command I execute - a single threaded insert that runs on the same host as Cassnadra does (I am using new contrib/stress but old py_stress produces similar results): ./stress -t 1 -o INSERT -c 30 -n 10000 -i 1 On a SUSE Linux server with a 4-core Intel XEON I get maximum 30 inserts a second with 40ms latency. But on a Windows desktop I get incredible 200-260 inserts a second with a 4ms latency!!! Even on the smallest MacBook Pro I get bursts of high throughput - 100+ inserts a second. Could you please help me figure out what is wrong with my server? I tried several servers actually with the same results. I would appreciate any help in tracing down the bottleneck. Configuration is the same in all tests with the server having the advantage of separate physical disks for commitlog and data. Could you also share with me what numbers you get or what is reasonable to expect from this test? Thank you very much, Oleg Here is the output for the Linux server, Windows desktop and MacBook Pro, one line per second: Linux server - INtel XEON X3330 @ 2.666Mhz, 4G RAM, 2G heap Created keyspaces. Sleeping 1s for propagation. total,interval_op_rate,interval_key_rate,avg_latency,elapsed_time 19,19,19,0.05947368421052632,1 46,27,27,0.04274074074074074,2 70,24,24,0.04733333333333333,3 95,25,25,0.04696,4 119,24,24,0.04820833333333333,5 147,28,28,0.04189285714285714,7 177,30,30,0.03903333333333334,8 206,29,29,0.04006896551724138,9 235,29,29,0.03903448275862069,10 Windows desktop: Core2 Duo CPU E6550 @ 2.333Mhz, 2G RAM, 1G heap Keyspace already exists. total,interval_op_rate,interval_key_rate,avg_latency,elapsed_time 147,147,147,0.005292517006802721,1 351,204,204,0.0042009803921568625,2 527,176,176,0.006551136363636364,3 718,191,191,0.005617801047120419,4 980,262,262,0.00400763358778626,5 1206,226,226,0.004150442477876107,6 1416,210,210,0.005619047619047619,7 1678,262,262,0.0040038167938931295,8 MacBook Pro: Core2 Duo CPU @ 2.26Mhz, 2G RAM, 1G heap Created keyspaces. Sleeping 1s for propagation. total,interval_op_rate,interval_key_rate,avg_latency,elapsed_time 0,0,0,NaN,1 7,7,7,0.21185714285714285,2 47,40,40,0.026925,3 171,124,124,0.007967741935483871,4 258,87,87,0.01206896551724138,6 294,36,36,0.022444444444444444,7 303,9,9,0.14377777777777778,8 307,4,4,0.2455,9 313,6,6,0.128,10 508,195,195,0.007938461538461538,11 792,284,284,0.0035985915492957746,12 882,90,90,0.01218888888888889,13
