Maximal write througput in MySQL
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I recently was asked what maximal amount transactions per second we can get using MySQL and XtraDB / InnoDB storage engine if we have high-end server. Good questions, though not easy to answer, as it depends on:
- durability setting ( innodb_flush_log_at_trx_commit = 0 or 1 ) ?
- do we use binary logs ( I used ROW based replication for 5.1)
- do we have sync_binlog options.
So why would not take these as variable parameters and run simple
I took sysbench update_key scenario ( update indexed field on simple table)
and used Dell PowerEdge R900 with 16 cores, FusionIO as storage for table and RAID 10 with BBU as storage for innodb log files, innodb system table space and binary logs. And I used Percon-XtraDB-5.1.43-9.1 for benchmarks. All used partitions are formatted in XFS and mounted with nobarrier option.
I run update key for various threads and with next parameters
- trx_commit=0 : innodb_flush_log_at_trx_commit = 0 and no binary logs
- trx_commit=1 : innodb_flush_log_at_trx_commit = 1 and no binary logs
- trx_commit=0 & binlog : innodb_flush_log_at_trx_commit = 0 and binary logs
- trx_commit=1 & binlog : innodb_flush_log_at_trx_commit = 1 and binary logs
- trx_commit=1 & binlog & sync_bin : innodb_flush_log_at_trx_commit = 1 and binary logs and sync_binlog=1
There are results I get:
I found results being quite interesting.
with innodb_flush_log_at_trx_commit = 0 maximal tps is 36332.02 tps, which drops to 23115.04 tps as
we switch to innodb_flush_log_at_trx_commit = 1. As we use RAID10 with BBU, I did not expect the drops is going to be significant. In second case InnoDB spends
With enabling binary logs, the results drops to 17451.01 tps with innodb_flush_log_at_trx_commit = 0 and to 12097.39 tps with innodb_flush_log_at_trx_commit = 1. So with binary logs serialization is getting even worse.
Enabling sync_binlog makes things really bad, and maximal results I
3086.7 tps. So this is good decision if binary log protection is worth such drop.
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