> 512G memory , 128core cpu This seems dramatically oversized for a Cassandra node. You'd do *much* better to have a much larger cluster of much smaller nodes.
On Thu, Nov 5, 2015 at 8:25 AM Jack Krupansky <jack.krupan...@gmail.com> wrote: > I don't know what current numbers are, but last year the idea of getting 1 > million writes per second on a 96 node cluster was considered a reasonable > achievement. That would be roughly 10,000 writes per second per node and > you are getting twice that. > > See: > http://www.datastax.com/1-million-writes > > Or this Google test which hit 1 million writes per second with 330 nodes, > which would be roughly 3,000 writes per second per node: > > http://googlecloudplatform.blogspot.com/2014/03/cassandra-hits-one-million-writes-per-second-on-google-compute-engine.html > > So, is your question why your throughput is so good or are you > disappointed that it wasn't better? > > Cassandra is designed for clusters with lots of nodes, so if you want to > get an accurate measure of per-node performance you need to test with a > reasonable number of nodes and then divide aggregate performance by the > number of nodes, not test a single node alone. In short, testing a single > node in isolation is not a recommended approach to testing Cassandra > performance. > > > -- Jack Krupansky > > On Thu, Nov 5, 2015 at 9:05 AM, 郝加来 <ha...@neusoft.com> wrote: > >> hi >> veryone >> i setup cassandra 2.2.3 on a node , the machine 's environment is >> openjdk-1.8.0 , 512G memory , 128core cpu , 3T ssd . >> the token num is 256 on a node , the program use datastax driver 2.1.8 >> and use 5 thread to insert data to cassandra on the same machine , the data >> 's capcity is 6G and 1157000 line . >> >> why is the throughput 20000/s on the node ? >> >> >> # Per-thread stack size. >> >> JVM_OPTS="$JVM_OPTS -Xss512k" >> >> >> >> # Larger interned string table, for gossip's benefit (CASSANDRA-6410) >> >> JVM_OPTS="$JVM_OPTS -XX:StringTableSize=1000003" >> >> >> >> # GC tuning options >> >> JVM_OPTS="$JVM_OPTS -XX:+CMSIncrementalMode" >> >> JVM_OPTS="$JVM_OPTS -XX:+DisableExplicitGC" >> >> JVM_OPTS="$JVM_OPTS -XX:+CMSConcurrentMTEnabled" >> >> JVM_OPTS="$JVM_OPTS -XX:+UseParNewGC" >> >> JVM_OPTS="$JVM_OPTS -XX:+UseConcMarkSweepGC" >> >> JVM_OPTS="$JVM_OPTS -XX:+CMSParallelRemarkEnabled" >> >> JVM_OPTS="$JVM_OPTS -XX:SurvivorRatio=4" >> >> JVM_OPTS="$JVM_OPTS -XX:MaxTenuringThreshold=2" >> >> JVM_OPTS="$JVM_OPTS -XX:CMSInitiatingOccupancyFraction=75" >> >> JVM_OPTS="$JVM_OPTS -XX:+UseCMSInitiatingOccupancyOnly" >> >> JVM_OPTS="$JVM_OPTS -XX:+UseTLAB" >> >> JVM_OPTS="$JVM_OPTS >> -XX:CompileCommandFile=$CASSANDRA_CONF/hotspot_compiler" >> >> JVM_OPTS="$JVM_OPTS -XX:CMSWaitDuration=60000" >> >> >> >> memtable_heap_space_in_mb: 1024 >> >> memtable_offheap_space_in_mb: 10240 >> >> memtable_cleanup_threshold: 0.55 >> >> memtable_allocation_type: heap_buffers >> >> >> >> >> 以上 >> 谢谢 >> ------------------------------ >> >> *郝加来* >> >> 金融华东事业部 >> >> 东软集团股份有限公司 >> 上海市闵行区紫月路1000号东软软件园 >> Postcode：200241 >> Tel：(86 21) 33578591 >> Fax：(86 21) *23025565-111* >> Mobile：13764970711 >> Email：ha...@neusoft.com >> Http://www.neusoft.com <http://www.neusoft.com/> >> >> >> >> >> >> >> >> --------------------------------------------------------------------------------------------------- >> Confidentiality Notice: The information contained in this e-mail and any >> accompanying attachment(s) >> is intended only for the use of the intended recipient and may be >> confidential and/or privileged of >> Neusoft Corporation, its subsidiaries and/or its affiliates. If any >> reader of this communication is >> not the intended recipient, unauthorized use, forwarding, printing, >> storing, disclosure or copying >> is strictly prohibited, and may be unlawful.If you have received this >> communication in error,please >> immediately notify the sender by return e-mail, and delete the original >> message and all copies from >> your system. Thank you. >> >> --------------------------------------------------------------------------------------------------- >> > >
