Thanks. I was hoping there was an easy fix if you did something like used serializable isolation, but you haven't done that.
On Fri, Jun 9, 2017 at 12:27 AM, J. Cassidy <s...@jdcassidy.eu> wrote: > All, > > as discussed yesterday, here is my setup and configuration. > > > ************************************************************* > 16 VCPU 64GB Memory, DB size 12 GB (In RAM), MariaDB 10.1.24* > Single Image. No clustering or outside network interaction * > SuSE SLES 12 SP2 using a 4.4.49-92 kernel * > ************************************************************* > ### Sysbench R/W - 64 Threads > > sysbench 0.5: multi-threaded system evaluation benchmark > > Running the test with following options: > Number of threads: 64 > Report intermediate results every 2 second(s) > Initializing random number generator from seed (42). > > > Threads started! > > [ 2s] threads: 64, tps: 51141.62, reads: 717023.15, writes: 204757.48, > response time: 4.72ms (99%), errors: 54.00, reconnects: 0.00 > [ 4s] threads: 64, tps: 47938.19, reads: 671195.72, writes: 191759.28, > response time: 4.65ms (99%), errors: 5.00, reconnects: 0.00 > [ 6s] threads: 64, tps: 46908.41, reads: 656790.25, writes: 187640.64, > response time: 4.65ms (99%), errors: 2.50, reconnects: 0.00 > [ 8s] threads: 64, tps: 45940.12, reads: 643191.64, writes: 183781.47, > response time: 4.44ms (99%), errors: 3.00, reconnects: 0.00 > [ 10s] threads: 64, tps: 45789.91, reads: 641083.20, writes: 183161.13, > response time: 4.77ms (99%), errors: 2.00, reconnects: 0.00 > [ 12s] threads: 64, tps: 45408.37, reads: 635825.16, writes: 181672.97, > response time: 4.80ms (99%), errors: 1.50, reconnects: 0.00 > [ 14s] threads: 64, tps: 44319.93, reads: 620440.07, writes: 177262.74, > response time: 4.50ms (99%), errors: 0.50, reconnects: 0.00 > [ 16s] threads: 64, tps: 44634.78, reads: 624843.97, writes: 178523.13, > response time: 4.71ms (99%), errors: 0.50, reconnects: 0.00 > . > . > . > [ 572s] threads: 64, tps: 24980.71, reads: 349707.39, writes: 99924.32, > response time: 5.92ms (99%), errors: 0.00, reconnects: 0.00 > [ 574s] threads: 64, tps: 25337.03, reads: 354796.98, writes: 101355.13, > response time: 6.19ms (99%), errors: 0.00, reconnects: 0.00 > [ 576s] threads: 64, tps: 25196.31, reads: 352683.33, writes: 100777.24, > response time: 6.49ms (99%), errors: 0.00, reconnects: 0.00 > [ 578s] threads: 64, tps: 25235.61, reads: 353317.05, writes: 100941.94, > response time: 5.94ms (99%), errors: 0.00, reconnects: 0.00 > [ 580s] threads: 64, tps: 25241.11, reads: 353395.59, writes: 100956.96, > response time: 6.09ms (99%), errors: 0.00, reconnects: 0.00 > [ 582s] threads: 64, tps: 25146.18, reads: 352056.04, writes: 100599.73, > response time: 5.96ms (99%), errors: 0.00, reconnects: 0.00 > [ 584s] threads: 64, tps: 25242.59, reads: 353362.72, writes: 100978.85, > response time: 6.21ms (99%), errors: 0.00, reconnects: 0.00 > [ 586s] threads: 64, tps: 25297.02, reads: 354187.80, writes: 101166.58, > response time: 5.89ms (99%), errors: 0.00, reconnects: 0.00 > [ 588s] threads: 64, tps: 25070.60, reads: 350944.86, writes: 100283.39, > response time: 6.33ms (99%), errors: 0.00, reconnects: 0.00 > [ 590s] threads: 64, tps: 25115.20, reads: 351666.84, writes: 100466.81, > response time: 6.21ms (99%), errors: 0.00, reconnects: 0.00 > [ 592s] threads: 64, tps: 25165.11, reads: 352314.52, writes: 100668.94, > response time: 5.98ms (99%), errors: 0.00, reconnects: 0.00 > [ 594s] threads: 64, tps: 25165.99, reads: 352322.89, writes: 100703.97, > response time: 6.30ms (99%), errors: 0.00, reconnects: 0.00 > [ 596s] threads: 64, tps: 24854.73, reads: 347945.66, writes: 99370.90, > response time: 6.17ms (99%), errors: 0.00, reconnects: 0.00 > [ 598s] threads: 64, tps: 24888.16, reads: 348463.80, writes: 99556.16, > response time: 6.21ms (99%), errors: 0.00, reconnects: 0.00 > [ 600s] threads: 64, tps: 25158.22, reads: 352195.58, writes: 100633.38, > response time: 5.94ms (99%), errors: 0.00, reconnects: 0.00 > OLTP test statistics: > queries performed: > read: 256244548 > write: 73212536 > other: 36606172 > total: 366063256 > transactions: 18302990 (30454.11 per sec.) > read/write requests: 329457084 (548179.44 per sec.) > other operations: 36606172 (60908.54 per sec.) > ignored errors: 192 (0.32 per sec.) > reconnects: 0 (0.00 per sec.) > > General statistics: > total time: 601.0023s > total number of events: 18302990 > total time taken by event execution: 38450.5507s > response time: > min: 0.42ms > avg: 2.10ms > max: 62.26ms > approx. 99 percentile: 5.62ms > > Threads fairness: > events (avg/stddev): 285984.2188/3788.79 > execution time (avg/stddev): 600.7899/0.00 > > > ============================================================ > ===================================================== > > ### Excerpt from MariaDB Error Log (Thousands of similiar messages). > . > . > . > 2017-06-08 8:10:44 4395980287248 [ERROR] mysqld: Deadlock found when > trying to get lock; try restarting transaction > 2017-06-08 8:10:44 4353081699600 [ERROR] mysqld: Deadlock found when > trying to get lock; try restarting transaction > 2017-06-08 8:10:44 4353087458576 [ERROR] mysqld: Deadlock found when > trying to get lock; try restarting transaction > 2017-06-08 8:10:44 4360227998992 [ERROR] mysqld: Deadlock found when > trying to get lock; try restarting transaction > 2017-06-08 8:10:44 4353073515792 [ERROR] mysqld: Deadlock found when > trying to get lock; try restarting transaction > 2017-06-08 8:10:44 4390705949968 [ERROR] mysqld: Deadlock found when > trying to get lock; try restarting transaction > 2017-06-08 8:10:44 4360227392784 [ERROR] mysqld: Deadlock found when > trying to get lock; try restarting transaction > 2017-06-08 8:10:44 4353087458576 [ERROR] mysqld: Deadlock found when > trying to get lock; try restarting transaction > 2017-06-08 8:10:44 4353073515792 [ERROR] mysqld: Deadlock found when > trying to get lock; try restarting transaction > 2017-06-08 8:10:44 4353087458576 [ERROR] mysqld: Deadlock found when > trying to get lock; try restarting transaction > . > . > . > > ============================================================ > ======================================================= > The configuration below has been tried and tested and works across on > different architectures e.g. S390X and S390X. > > > [mysqld_safe] > user=root > password='' > [mysqld] > symbolic-links=0 > open_files_limit = 65535 # was 102400 > max_allowed_packet = 16M # was 768M > max-connect-errors = 1000000 > connect_timeout = 120 # was 60 > performance-schema = false > net_read_timeout = 720 > log-warnings=2 > #####files and sockets > # innodb_log_group_home_dir= /data-lun22/logs > pid-file=/tmp/mysqld.pid.sysbench > port = 3306 > # log-error=/var/log/mariadb/mariadb-error-john.log > log-error=/var/log/mariadb/mariadb-error-john.log > general_log_file=/var/log/mariadb/mariadb-john.log > long_query_time = 0 > slow_query_log = 0 > # slow_query_log_file = /var/log/mariadb/mariadb-slowquery.log > # general-log > # general_log_file=/var/log/mariadb/mariadb-general.log > ##### MariaDB temporary tables > # tmpdir in RAM > tmpdir = /mnt/tmpdir > #####non innodb options (fixed) > max_connections = 4000 > back_log = 150 > table_open_cache = 8000 # was 2048 # was 4000 # was 8000 > key_buffer_size = 16M > query_cache_type = 0 #was 1 # was 0 > join_buffer_size = 32K > sort_buffer_size = 32K > autocommit = 0 > thread-cache-size = 50 > table-definition-cache = 1024 > table-open-cache = 2048 > ####fixed innodb options > innodb_file_per_table = true > innodb_open_files = 4096 # was 8192 # was 4096 > innodb_data_file_path = ibdata1:250M:autoextend > innodb_flush_log_at_trx_commit = 2 > innodb_flush_method = O_DIRECT_NO_FSYNC > innodb_log_buffer_size = 256M > innodb_log_file_size = 4G # was 14G # was 4G > innodb_log_files_in_group = 2 > innodb_buffer_pool_size = 36G #was 8G # was 48G > innodb_buffer_pool_instances = 8 # 16 # was 6 # was 32 > innodb_adaptive_hash_index_partitions = 32 > innodb_thread_concurrency = 0 > ####tuning for RAM disk > innodb_adaptive_flushing = 1 > innodb_flush_neighbors = 0 > innodb_io_capacity = 8000 # was 20000 > innodb_io_capacity_max = 40000 > innodb_lru_scan_depth = 4096 > innodb_purge_threads = 2 > innodb_read_io_threads = 2 > innodb_write_io_threads = 2 > > > <*> Note NMON reports 35% memory usage in the middle of the abovementioned > Banchmark ergo the DB is in cache. No paging. > > ++ Note The R/W TPS rate are "respectable" based on observations from > countless other runs ran on other configurations/architecture. > The TPS rates would obviously improve if the deadlock situation > outlined above was resolved. > > > So there you have it. Any tips / pointers that would enlighten me are much > appreciated. > > Regards, > > > JC > > > Privet Sergey, > > do not think I have a problem with my config(s). > > I am not on the machine at the moment. > From memory, with 16 Cores / 32 VCPU, 64 GB memory, buffer pools, logs > etc. tailored to this configuration, the TPS rate is > > 64 threads - R/O 73K R/W 26K > 128 threads - R/O 71K R/W 23K. > > I am putting the DB in RAM of course to obviate I/O issues. I am > interested in seeing what is happening with the CPU caches and nest.. > > NMON tells me that for the R/O runs I have approximately 85% User, 12-14% > System and the rest Idle - this stays consistent throughout the run (300 > seconds R/O, 600 seconds R/W) which is reasonable. > > On the R/W runs, NMONs CPU usage display shows that some CPUs are barely > firing, or only intermittently and the granularity I had with R/O is gone. > This would seem to tie in with what I see in the MariaDB log - headwinds, > violent storms and deadlocks. > > Any further information you require, please let me know. > > > > Regards, > > > JC > > Hi! > > I just tried this on x86: 40 threads against single table having 10k rows. > No deadlocks, "tps: 12372.40, reads: 173219.52, writes: 49490.51". > > This is with latest snapshot of 10.1 and sysbench 1.0. > > I believe you shouldn't see deadlocks on such a big data set. Probably > > something is wrong with your configs? > > Regards, > Sergey > > On Thu, Jun 08, 2017 at 04:51:31PM +0200, J. Cassidy wrote: > > > > > > Hello Mark, > > > > appreciate the reply. > > > > The OLTP table size and > > OLTP size give me a DB size of appx 12GB. This is what I want. I have in > the > > meantime, looked at some older logs and see that whatever amount of > threads I > > specify (8, 16,32, 64 or 128), the deadlock messages are still surfacing > in the > > R/W phase > > of Sysbench. I even dropped in two different MariaDB release levels > > (10.0.19, 10.1.24) to see whether it would make a difference, deadlock > still > > there. I am using Sysbench 0.5 for these tests. > > I am currently using MariaDB > > 10.1.24 - built directly on the machine. S390x by the way, but the > problem is > > also > > occuring on an X86-64 box. > > > > Regards, > > > > > > JC > > > > > > > > I run sysbench frequently with MySQL > > (not MariaDB yet) and don't recall ever seeing this error. But I use > much > > larger values for --oltp-table-size. You used 85937 and I use 1M or > larger. > > Maybe > > there is too much data contention with smaller tables, even if a large > number of > > tables is used (128 in your case). I use a smaller number of tables - > between 4 > > and 20. On Thu, Jun 8, 2017 at 12:48 AM, J. Cassidy s...@jdcassidy.eu> > wrote: > > Hello all, > > > > > > have used Sysbench extensively to test MariaDB CPU load factors between > various > > architectures. > > > > I am noticing massive amounts of "[ERROR] mysqld: > > Deadlock found when trying to get lock; try restarting transaction" in > the > > MariaDB error log during the R/W phase. The Sysbench R/W TPS rates are > still > > respectable for my purposes, but how do I > > correct this condition?? Can I > > ignore this / must live with it? > > I have tried three different MariaDB > > releases (10.0.19, 10.1.12, 10.1.24) to narrow things down, but this > message (x > > 1000's) is happening across all releases in the Sysbench R/W phase. > > > > Here is the Sysbench command that drives the workload against MariaDB - > > > > sysbench --test=lua/oltp.lua --oltp_tables_count=128 > --oltp-table-size=85937 > > --rand-seed=42 --rand-type=uniform --num-threads=128 --oltp-read-only=off > > --report-interval=2 --mysql-socket=/var/lib/mysql/mysql.sock > --max-time=201 > > --max-requests=0 --mysql-user=root --percentile=99 run > > > > Would anyone > > have a tip / idea /pointer? > > > > > > Regards, > > > > > > JC > > > > > > John Cassidy > > > > Obere Bühlstrasse 21 > > 8700 Küsnacht > > (ZH) > > Switzerland / Suisse / Schweiz > > > > > > Mobile: +49 152 58961601 <+49%201525%208961601> (Germany) > > Mobile: +352 621 577 149 (Luxembourg) > > Mobile: +41 78 769 17 97 <+41%2078%20769%2017%2097> (CH) > > Landline: +41 44 509 1957 > > > > http://www.jdcassidy.eu > > > > "Aut viam inveniam aut > > faciam" - Hannibal. > > _______________________________________________ > > Mailing list: https://launchpad.net/~maria-discuss > > Post to : > > maria-discuss@lists.launchpad.net > > Unsubscribe : https://launchpad.net/~maria-discuss > > More help : https://help.launchpad.net/ListHelp > > --Mark Callaghan > > mdcal...@gmail.com > > > > John Cassidy > > > > Obere Bühlstrasse 21 > > 8700 > > Küsnacht (ZH) > > Switzerland / Suisse / Schweiz > > > > > > Mobile: > > +49 152 58961601 (Germany) > > Mobile: +352 621 577 149 <+352%20621%20577%20149> (Luxembourg) > > Mobile: > > +41 78 769 17 97 <+41%2078%20769%2017%2097> (CH) > > Landline: +41 44 509 1957 <+41%2044%20509%2019%2057> > > > > http://www.jdcassidy.eu > > > > "Aut viam inveniam aut faciam" - > > Hannibal. > > > _______________________________________________ > > Mailing list: https://launchpad.net/~maria-discuss > > Post to : maria-discuss@lists.launchpad.net > > Unsubscribe : https://launchpad.net/~maria-discuss > > More help : https://help.launchpad.net/ListHelp > > > > > John Cassidy > > Obere Bühlstrasse 21 > 8700 Küsnacht (ZH) > Switzerland / Suisse / Schweiz > > > Mobile: +49 152 58961601 <+49%201525%208961601> (Germany) > Mobile: +352 621 577 149 <+352%20621%20577%20149> (Luxembourg) > Mobile: +41 78 769 17 97 <+41%2078%20769%2017%2097> (CH) > Landline: +41 44 509 1957 <+41%2044%20509%2019%2057> > > http://www.jdcassidy.eu > > "Aut viam inveniam aut faciam" - Hannibal. > > John Cassidy > > Obere Bühlstrasse 21 > 8700 Küsnacht (ZH) > Switzerland / Suisse / Schweiz > > > Mobile: +49 152 58961601 <+49%201525%208961601> (Germany) > Mobile: +352 621 577 149 <+352%20621%20577%20149> (Luxembourg) > Mobile: +41 78 769 17 97 <+41%2078%20769%2017%2097> (CH) > Landline: +41 44 509 1957 <+41%2044%20509%2019%2057> > > http://www.jdcassidy.eu > > "Aut viam inveniam aut faciam" - Hannibal. > > _______________________________________________ > Mailing list: https://launchpad.net/~maria-discuss > Post to : maria-discuss@lists.launchpad.net > Unsubscribe : https://launchpad.net/~maria-discuss > More help : https://help.launchpad.net/ListHelp > > -- Mark Callaghan mdcal...@gmail.com
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