Every use case is unique so as such jvm configs go with it. 8G may or may not be sufficient depending on live data you keep in, or fetch to memory. You can opt using G1GC, that is easy to start with. Some good suggestions are made if you want to try G1GC or stick with CMS. Take a look at [ https://tobert.github.io/pages/als-cassandra-21-tuning-guide.html ]
-----Original Message----- From: p...@xvalheru.org [mailto:p...@xvalheru.org] Sent: Thursday, September 05, 2019 9:05 AM To: User <user@cassandra.apache.org> Subject: Cassandra JVM configuration Hi, sorry to bring such question, but I want to ask what are the best JVM options for Cassandra node? In solution I'm implementing the Cassandra serves as read-only storage (of course populated at beginning) - the records are not changed in time. Currently each Cassandra node's VM has this configuration 16CPUs and 64GB of RAM. I've set these JVM options: -Xms4G and -Xmx40G; JDK 1.8.0_221. My question is what's the best size of memory for Cassandra node and if there's any relation between number of CPUs and memory size. When I've searched for an answer I've found that suggested size for node is 8GB of RAM, but I have doubts. Thanks Pat ---------------------------------------- Freehosting PIPNI - https://urldefense.proofpoint.com/v2/url?u=http-3A__www.pipni.cz_&d=DwICAg&c=LFYZ-o9_HUMeMTSQicvjIg&r=FsmDztdsVuIKml8IDhdHdg&m=H2t7NfxXR_c8S_gVHKbkqoJYt2uJNvBvRcQBiEk2beI&s=OOXUbYzda5jQw9DZVUA4yExJv1gDNPzsxS0yqPlrDqY&e= --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org
