pika thread-num 上限

[cjiefeng]

v3.4.0

thread-num 是否有上限呢，在配置文件里设了 thread-num: 48 但是 INFO 却只显示 24.

pika.conf

# Pika port
port : 9221
# Thread Number
thread-num : 48
# Thread Pool Size
thread-pool-size : 12
# Sync Thread Number
sync-thread-num : 6
# Pika log path
log-path : ./log/
# Pika db path
db-path : ./db/
# Pika write-buffer-size
write-buffer-size : 268435456
# size of one block in arena memory allocation.
# If <= 0, a proper value is automatically calculated
# (usually 1/8 of writer-buffer-size, rounded up to a multiple of 4KB)
arena-block-size :
# Pika timeout
timeout : 60
# Requirepass
requirepass : abcd_1234
# Masterauth
masterauth : abcd_1234
# Userpass
userpass : abcd_1234
# User Blacklist
userblacklist : FLUSHALL, SHUTDOWN, KEYS
# if this option is set to 'classic', that means pika support multiple DB, in
# this mode, option databases enable
# if this option is set to 'sharding', that means pika support multiple Table, you
# can specify slot num for each table, in this mode, option default-slot-num enable
# Pika instance mode [classic | sharding]
instance-mode : classic
# Set the number of databases. The default database is DB 0, you can select
# a different one on a per-connection basis using SELECT <dbid> where
# dbid is a number between 0 and 'databases' - 1, limited in [1, 8]
databases : 1
# default slot number each table in sharding mode
default-slot-num : 1024
# replication num defines how many followers in a single raft group, only [0, 1, 2, 3, 4] is valid
replication-num : 0
# consensus level defines how many confirms does leader get, before commit this log to client,
#                 only [0, ...replicaiton-num] is valid
consensus-level : 0
# Dump Prefix
dump-prefix : backup-
# daemonize  [yes | no]
daemonize : yes
# Dump Path
dump-path : ./dump/
# Expire-dump-days
dump-expire : 0
# pidfile Path
pidfile : ./pika.pid
# Max Connection
maxclients : 20000
# the per file size of sst to compact, default is 20M
target-file-size-base : 20971520
# Expire-logs-days
expire-logs-days : 7
# Expire-logs-nums
expire-logs-nums : 300
# Root-connection-num
root-connection-num : 2
# Slowlog-write-errorlog
slowlog-write-errorlog : ./log/pika.log
# Slowlog-log-slower-than
slowlog-log-slower-than : 10000
# Slowlog-max-len
slowlog-max-len : 128
# Pika db sync path
db-sync-path : ./dbsync/
# db sync speed(MB) max is set to 1024MB, min is set to 0, and if below 0 or above 1024, the value will be adjust to 1024
db-sync-speed : -1
# The slave priority
slave-priority : 100
# network interface
#network-interface : eth1
# replication
#slaveof : master-ip:master-port

# CronTask, format 1: start-end/ratio, like 02-04/60, pika will check to schedule compaction between 2 to 4 o'clock everyday
#                   if the freesize/disksize > 60%.
#           format 2: week/start-end/ratio, like 3/02-04/60, pika will check to schedule compaction between 2 to 4 o'clock
#                   every wednesday, if the freesize/disksize > 60%.
#           NOTICE: if compact-interval is set, compact-cron will be mask and disable.
#
#compact-cron : 3/02-04/60

# Compact-interval, format: interval/ratio, like 6/60, pika will check to schedule compaction every 6 hours,
#                           if the freesize/disksize > 60%. NOTICE:compact-interval is prior than compact-cron;
#compact-interval :

# the size of flow control window while sync binlog between master and slave.Default is 9000 and the maximum is 90000.
sync-window-size : 9000
# max value of connection read buffer size: configurable value 67108864(64MB) or 268435456(256MB) or 536870912(512MB)
#                                           default value is 268435456(256MB)
#                                           NOTICE: master and slave should share exactly the same value
max-conn-rbuf-size : 268435456


###################
## Critical Settings
###################
# write_binlog  [yes | no]
write-binlog : yes
# binlog file size: default is 100M,  limited in [1K, 2G]
binlog-file-size : 104857600
# Automatically triggers a small compaction according statistics
# Use the cache to store up to 'max-cache-statistic-keys' keys
# if 'max-cache-statistic-keys' set to '0', that means turn off the statistics function
# it also doesn't automatically trigger a small compact feature
max-cache-statistic-keys : 0
# When 'delete' or 'overwrite' a specific multi-data structure key 'small-compaction-threshold' times,
# a small compact is triggered automatically, default is 5000, limited in [1, 100000]
small-compaction-threshold : 5000
# If the total size of all live memtables of all the DBs exceeds
# the limit, a flush will be triggered in the next DB to which the next write
# is issued.
max-write-buffer-size : 10737418240
# The maximum number of write buffers that are built up in memory for one ColumnFamily in DB.
# The default and the minimum number is 2, so that when 1 write buffer
# is being flushed to storage, new writes can continue to the other write buffer.
# If max-write-buffer-number > 3, writing will be slowed down
# if we are writing to the last write buffer allowed.
max-write-buffer-number : 2
# Limit some command response size, like Scan, Keys*
max-client-response-size : 1073741824
# Compression type supported [snappy, zlib, lz4, zstd]
compression : snappy
# max-background-flushes: default is 1, limited in [1, 4]
max-background-flushes : 1
# max-background-compactions: default is 2, limited in [1, 8]
max-background-compactions : 2
# maximum value of Rocksdb cached open file descriptors
max-cache-files : 5000
# max_bytes_for_level_multiplier: default is 10, you can change it to 5
max-bytes-for-level-multiplier : 10
# BlockBasedTable block_size, default 4k
# block-size: 4096
# block LRU cache, default 8M, 0 to disable
# block-cache: 8388608
# whether the block cache is shared among the RocksDB instances, default is per CF
# share-block-cache: no
# whether or not index and filter blocks is stored in block cache
# cache-index-and-filter-blocks: no
# when set to yes, bloomfilter of the last level will not be built
# optimize-filters-for-hits: no
# https://github.com/facebook/rocksdb/wiki/Leveled-Compaction#levels-target-size
# level-compaction-dynamic-level-bytes: no

INFO

> info
# Server
pika_version:3.4.0
pika_git_sha:bd30511bf82038c2c6531b3d84872c9825fe836a
pika_build_compile_date: Mar 22 2021
os:Linux 3.10.0-862.el7.x86_64 x86_64
arch_bits:64
process_id:356075
tcp_port:9221
thread_num:24
sync_thread_num:6
uptime_in_seconds:1796
uptime_in_days:1
config_file:./conf/pika.conf
server_id:1

# Data
db_size:15700846771
db_size_human:14973M
log_size:31423906606
log_size_human:29968M
compression:snappy
used_memory:767358140
used_memory_human:731M
db_memtable_usage:8000
db_tablereader_usage:767350140
db_fatal:0
db_fatal_msg:NULL

# Clients
connected_clients:1

# Stats
total_connections_received:296
instantaneous_ops_per_sec:0
total_commands_processed:240808046
is_bgsaving:No
is_scaning_keyspace:No
is_compact:No
compact_cron:
compact_interval:

# CPU
used_cpu_sys:6189.15
used_cpu_user:13353.12
used_cpu_sys_children:0.00
used_cpu_user_children:0.00

# Replication(MASTER)
role:master
connected_slaves:1
slave0:ip=xx.xx.xx.xx,port=9221,conn_fd=163,lag=(db0:0)
db0 binlog_offset=622 68476291,safety_purge=write2file612

# Keyspace
# Time:1970-01-01 08:00:00
db0 Strings_keys=0, expires=0, invalid_keys=0
db0 Hashes_keys=0, expires=0, invalid_keys=0
db0 Lists_keys=0, expires=0, invalid_keys=0
db0 Zsets_keys=0, expires=0, invalid_keys=0
db0 Sets_keys=0, expires=0, invalid_keys=0

[kernelai]

thread-num 有上限为24.参数大小设置可以参考下最佳实践