something is screwed up if writes are 10x slower than reads
On Mon, Mar 8, 2010 at 5:52 PM, David Dabbs <dmda...@gmail.com> wrote: > > Hello. I've been running the vPork load generator against two Cassandra > nodes running in VMs. > I'm running a trunk build with W=2 and R=1 and out-of-the-box JVM_OPTS which > should be fine, > or so I thought. Throughput is lower than I expected. Are my expectations > out-of-line? > > Thanks, > > David > > > Writing results to: /home/vpork/results/30-thread-pork-39 > NumThreads : 30 > Iterations : 2000 > ReadOdds : 0.8 > WriteOdds : 0.1 > RewriteOdds : 0.1 > Data Size : 24000 B > Nodes file given: [configs/cassandra/nodes.conf] > Attempting to read nodes file: /home/vpork/configs/cassandra/nodes.conf > Using node: dev-a01 > Using node: dev-a02 > Testing if our store even works ... > %0.50 num=1 rGB=0.00 wGB=0.00 rFail=0 wFail=0 notFound=0 > ------------- > Elapsed time: 2.71 sec > > Writes: > Num Writes: 202 > Write Throughput: 74.54 writes / sec > Write Failures: 0 > Write Latency: 125.78 ms > Write Latency (%99): 454.67 ms > Write Latency stdDev: 102.78 > Bytes Written: 4.62 MB > Thread w/Throughput: 0.19 KB / sec > Total w/Throughput: 1747.00 KB / sec > > Reads: > Num Read: 1602 > Read Throughput: 591.14 reads / sec > Read Failures: 0 > Read Latency: 30.57 ms > Read Latency (%99): 273.68 ms > Read Latency stdDev: 50.19 > Read Not Found: 29 (%1.81) > Bytes Read: 20.19 MB > Thread r/Throughput: 0.77 KB / sec > Total r/Throughput: 7628.00 KB / sec > > > > >