Hi, Tony During my performance test, I also tested the performance without query logs. I disabled the query log feature , but it seemed that QPS couldn't go higher (about 75KQPS) when CPU still had lots of room -- Named CPU Usage was about 250%, but in theory it can reach to 400% (4 vCPU).
In your opinion, which default parameters I need pay attention to , which will impact system capacity performance when query log is off? Our Bind version is 9.10.5. Do you know what version you think will have better multi-threading ? Thank you very much! Michael -----Original Message----- From: PENG, JUNAN Sent: Wednesday, February 21, 2018 11:32 AM To: 'Tony Finch' <[email protected]> Subject: RE: Help Another thing: When query log is on. Traffic is 35k QPS, the Named CPU usage is 260% Traffic is 40K QPS, the Named CPU usage is 260% Traffic is 50K QPS, the Named CPU usage is 260% Traffic is 70 -100 KQPS, the named CPU usage is still 260% When the named CPU usage has a limitation 260% here ? (in theory, it should be 400%) BR Michael -----Original Message----- From: Tony Finch [mailto:[email protected]] Sent: Wednesday, February 21, 2018 11:09 AM To: PENG, JUNAN <[email protected]> Cc: [email protected] Subject: Re: Help PENG, JUNAN <[email protected]> wrote: > > Why Query log off/on feature is impacting named CPU Usage ? It has to serialize query processing in order to write to the log, and that serialization barrier limits the parallelism that it can achieve (due to Amdahl's law). Tony. -- f.anthony.n.finch <[email protected]> https://urldefense.proofpoint.com/v2/url?u=http-3A__dotat.at_&d=DwIBAg&c=LFYZ-o9_HUMeMTSQicvjIg&r=xVh2hygmrxdOcVtuPuDNjQ&m=6ZyClPvp9-p1nUQmEemmpxj_3-f1_sW8Fpnap_DuXjE&s=5383B5P89WllOA-wt8I4eVUaH2IU238-fa0ljJHGu38&e= - I xn--zr8h punycode South Utsire: Northerly or northeasterly 4 or 5, becoming variable 3 or 4. Slight or moderate. Fair. Good. _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list [email protected] https://lists.isc.org/mailman/listinfo/bind-users
