On Wed, Apr 7, 2010 at 4:36 AM, Simon Riggs <[email protected]> wrote: > On Wed, 2010-04-07 at 01:23 -0700, Ryan Tomayko wrote: >> But we also get occasional 200ms response times in those runs. Here's >> the max response times for the same memslap runs graphed above: > > It wouldn't be uncommon to see the occasional spike, though that graph > shows the very worst response time in the whole profile. It would be > useful to see all of the requests above a threshold, so we can see if a > pattern exists and to see how whether this occurs in groups.
Yeah. I was hoping to tease that out of the memslap result data but I can't find an easy way to get it. I'm starting in on a set of custom non-libmemcached tests now so I'll see what I can come up with. > Are the connections all equally and constantly busy, or are some > connections idle for much of the time? All connections are constantly busy. The results in my previous messages are from memslap <http://docs.tangent.org/libmemcached/memslap.html>. It basically just pounds the server with a configurable number of connections for a given time period unless you pass the --tps arg, which I haven't been able to get working. Here's the results from a quick run over the network at 50 concurrent connections: $ memslap -s memcache5 --threads=1 --time=5s --concurrency=50 servers : memcache5 threads count: 1 concurrency: 50 run time: 5s windows size: 10k set proportion: set_prop=0.10 get proportion: get_prop=0.90 Get Statistics (297962 events) Min: 165 Max: 204267 Avg: 751 Geo: 676.71 Std: 1743.18 Log2 Dist: 8: 775 92879 162248 40450 12: 1077 358 154 0 16: 0 0 21 Set Statistics (33134 events) Min: 155 Max: 203581 Avg: 777 Geo: 688.75 Std: 2258.45 Log2 Dist: 8: 76 10018 17598 5245 12: 124 52 17 0 16: 0 0 4 Total Statistics (331096 events) Min: 155 Max: 204267 Avg: 753 Geo: 677.91 Std: 1801.66 Log2 Dist: 8: 851 102897 179846 45695 12: 1201 410 171 0 16: 0 0 25 cmd_get: 298009 cmd_set: 33137 get_misses: 0 written_bytes: 57470410 read_bytes: 331002892 object_bytes: 36053056 Run time: 5.0s Ops: 331146 TPS: 66202 Net_rate: 74.1M/s Thanks, Ryan -- To unsubscribe, reply using "remove me" as the subject.
