Try using something higher than -t 1, like -t 100. - Tyler
On Mon, Jan 24, 2011 at 9:38 PM, Oleg Proudnikov <ol...@cloudorange.com>wrote: > 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 > > > >
