Support setcpuaffinity on linux/bsd

Currently, there are several types of threads/child processes of a
redis server. Sometimes we need deeply optimise the performance of
redis, so we would like to isolate threads/processes.

There were some discussion about cpu affinity cases in the issue:
https://github.com/antirez/redis/issues/2863

So implement cpu affinity setting by redis.conf in this patch, then
we can config server_cpulist/bio_cpulist/aof_rewrite_cpulist/
bgsave_cpulist by cpu list.

Examples of cpulist in redis.conf:
server_cpulist 0-7:2      means cpu affinity 0,2,4,6
bio_cpulist 1,3           means cpu affinity 1,3
aof_rewrite_cpulist 8-11  means cpu affinity 8,9,10,11
bgsave_cpulist 1,10-11    means cpu affinity 1,10,11

Test on linux/freebsd, both work fine.

Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/redis.conf b/redis.conf
index d96d26e1c..756073a27 100644
--- a/redis.conf
+++ b/redis.conf
@@ -1780,3 +1780,18 @@ rdb-save-incremental-fsync yes
 # Maximum number of set/hash/zset/list fields that will be processed from
 # the main dictionary scan
 # active-defrag-max-scan-fields 1000
+
+# Redis server/IO threads, bio threads, aof rewrite child process, and bgsave
+# child process cpu affinity list config. syntax of cpu list looks like taskset
+# command. serveral examples:
+# set redis server/io threads to cpu affinity 0,2,4,6
+# server_cpulist 0-7:2
+#
+# set bio threads to cpu affinity 1,3
+# bio_cpulist 1,3
+#
+# set aof rewrite child process to cpu affinity 8,9,10,11
+# aof_rewrite_cpulist 8-11
+#
+# set bgsave child process to cpu affinity 1,10,11
+# bgsave_cpulist 1,10-11