NUMA node0 CPU(s): 0-63,128-191NUMA node1 CPU(s): 64-127,192-255 Thread(s) per core: 2 Core(s) per socket: 64 Socket(s): 2 NUMA node(s): 2 corepinning(ta perf lock contention results for 24,32 vu 0-63 24: 18.03% postgres postgres [.] LWLockAcquire 32: 7.02% postgres postgres [.] LWLockAcquire 64-127 24: 17.96% postgres postgres [.] LWLockAcquire 32: 7.04% postgres postgres [.] LWLockAcquire 0-63,128-191(Node0) 24: 18.4% postgres postgres [.] LWLockAcquire 32: 7.07% postgres postgres [.] LWLockAcquire 64-127,192-255(Node1) 24: 18.3% postgres postgres [.] LWLockAcquire 32: 7.06% postgres postgres [.] LWLockAcquire I do not understand on interconnect type and has restrictions on lscpu .
On Tuesday, October 12, 2021, Mikhail Zhilin <zhilin...@phystech.edu> wrote: > Hi, > > How many sockets are on motherboard? > What is CPU model and interconnect type (UPI?)? > Can you share output of "lscpu"? > > If you have more than 1 NUMA node it may be worth to run PostgreSQL in > single NUMA node via taskset. It will eliminate access to remote memory and > speed up processing. > > Thanks, > Michael. > > On 10/12/21 10:35 AM, Ashkil Dighin wrote: > > > Hi, > Lock contention observed high in PostgreSQLv13.3 > The source code compiled with GNC(GCCv11.x) > PostgreSQL version: 13.3 > Operating system: RHEL8.3 > Kernel name:4.18.0-305.10.2.el8_4.x86_64 > RAM Size:512GB > SSD: 1TB > The environment used IBM metal and test benchmark environment HammerDbv4.2 > Test case :TPC-C > > Perf data for 24vu(TPC-C) > -------------------------------- > > 18.99% postgres postgres [.] LWLockAcquire > 7.09% postgres postgres [.] _bt_compare > 8.66% postgres postgres [.] LWLockRelease > 2.28% postgres postgres [.] GetSnapshotData > 2.25% postgres postgres [.] hash_search_with_hash_value > 2.11% postgres postgres [.] XLogInsertRecord > 1.98% postgres postgres [.] PinBuffer > > 1.Is there a way to tune the lock contention ? > 2.Is any recommendations to tune/reduce the lock contention via > postgres.conf > > Postgres.conf used in Baremetal > ======================== > shared_buffers = 128GB(1/4 th RAM size) > effective_cachesize=392 GB(1/3 or 75% of RAM size) > huge_pages = on > temp_buffers = 4000MB > work_mem = 4000MB > maintenance_work_mem = 512MB > autovacuum_work_mem = -1 > max_stack_depth = 7MB > dynamic_shared_memory_type = posix > max_files_per_process = 4000 > effective_io_concurrency = 32 > wal_level = minimal > synchronous_commit = off > wal_buffers = 512MB > checkpoint_timeout = 1h > checkpoint_completion_target = 1 > checkpoint_warning = 0 > log_min_messages = error > log_min_error_statement = error > log_timezone = 'GB' > autovacuum = off > datestyle = 'iso, dmy' > timezone = 'GB' > lc_messages = 'en_GB.UTF-8' > lc_monetary = 'en_GB.UTF-8' > lc_numeric = 'en_GB.UTF-8' > lc_time = 'en_GB.UTF-8' > default_text_search_config = 'pg_catalog.english' > max_locks_per_transaction = 64 > max_pred_locks_per_transaction = 64 > > Best Regards > Anil > > >
