WAL impact - MySQL 9.7.0 preview 2 times slower than Mariadb 12.3 preview

 mysql 9.7.0 preview looks like 2.3 times slower wrt mariadb with default binlog which is very surprising



Comments

Post a Comment

Popular posts from this blog

MySQL- Crash Recovery Performance Assessment

Why we need to assess the performance of   crash recovery in MySQ and here is my explanation:  It’s not just WLs or bug fixes — any change in redo format or code changes around it, flushing behavior, or recovery concurrency can silently slow things down and if you have huge volume of data to recover than it could be painful. MySQL errorlog is the best place to look into details like whats happening during recovery and which phase of recovery is time consuming. Basically , I measured the recovery  timing  - from “Starting crash recovery” to “Apply batch completed , in MySQLD error log. Refer this about recovery in Innodb here: https://dev.mysql.com/doc/refman/8.4/en/innodb-recovery.html#innodb-crash-recovery Let me share some of my hack to measure the time taken for crash-recovery experiment. 1.  I used ` innodb_checkpoint_disabled ` which is strictly a testing mechanism. It forces maximum redo accumulation and doesn’t reflect real‑world recovery .   in...
Read more

PGO in MySQL community 9.7

Image
  PGO ( Profile-guided optimization) in mysql community edition of 9.7.0 -------------------------------------------------------------------------------------------------------------------------- Straightforward ,  30% gain   we have seen in eneterprise edition of mysql   in read only sysbench test like point-select ( memory bound) .  I am curious to know whether similar gain , we see in pgo community build and what kind of test cases it use to train data? If pgo in community edition gives 30 percentage gain then it makes sense to use this feature by many other databases based on MySQL because it comes free without doing any extra tuning of mysqld config. As you can see,9.7.0 gives better performance wrt 9.6.0 and it's because of just pgo being put in. I referred INFO_BIN and 9.7 has fprofile compiler option whereas 9.6.0 doesn't have So, far I have seen release notes and I know, there is no other major changes would have contributed such gain. Its go...
Read more

Mariadb Performance : Openssl and wolfssl

Image
Why this SSL performance assessment of Mariadb ? My first objective was to assess new openssl 3.5 or 3.6 and see whether it's improving for Mariadb  or not and second , I could not find any comparative analysis of ssl for Mariabd in public space. Earlier in MySQL, I had done exhaustive assessment of  wolfssl and openssl's different version so thought of doing some against Mariadb which is another popular database and moving fast in db ranking. I used  memory bound test and sysbench's point-select without prepared statement to stress TLS layer the most. Another test , I picked is connect/disconnect which fires point-select query for each connection like PHP and this also stressess TLS layer the most. Key Findings In case of sysbench's point-select query like " SELECT c FROM sbtest1 WHERE id = 12345 ;" , wolfssl (5.8.4 default) is the best. openssl-1.1.1l/3.0.19/3.5.5/3.6.1 are less upto 9% wrt wolfssl. In case of sysbench's point-select query like "...
Read more