rpm --query centos-release
centos-release-6-9.el6.12.3.x86_64

service snmpd status
snmpd (pid  28244) is running...

strace -r -e trace=gettimeofday -p 28244
Process 28244 attached
     0.000000 gettimeofday({1516589055, 372419}, NULL) = 0
     0.000048 gettimeofday({1516589055, 372448}, NULL) = 0
     0.000015 gettimeofday({1516589055, 372463}, NULL) = 0
     0.000015 gettimeofday({1516589055, 372477}, NULL) = 0
     0.003271 gettimeofday({1516589055, 375751}, NULL) = 0

0.000013 munmap(0x7f1950abf000, 4096) = 0
     0.000086 open("/proc/sys/net/ipv6/conf/eth3/forwarding", O_RDONLY) = 11
     0.000028 fstat(11, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
     0.000015 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1950abf000
     0.000015 read(11, "0n", 1024)     = 2
     0.000017 close(11)                 = 0
     0.000012 munmap(0x7f1950abf000, 4096) = 0
     0.000017 open("/proc/sys/net/ipv6/neigh/eth3/base_reachable_time_ms", O_RDONLY) = 11
     0.000017 fstat(11, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
     0.000013 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1950abf000
     0.000014 read(11, "30000n", 1024) = 6
     0.000016 close(11)                 = 0
     0.000012 munmap(0x7f1950abf000, 4096) = 0
     0.000015 read(9, "", 1024)         = 0
     0.000026 close(9)                  = 0
     0.000015 munmap(0x7f1950ac0000, 4096) = 0
     0.000014 close(10)                 = 0
     0.000028 gettimeofday({1516099695, 497691}, NULL) = 0
     0.000015 gettimeofday({1516099695, 497705}, NULL) = 0
     0.000012 gettimeofday({1516099695, 497718}, NULL) = 0
     0.000016 gettimeofday({1516099695, 497734}, NULL) = 0
     0.000012 gettimeofday({1516099695, 497746}, NULL) = 0
     0.000013 gettimeofday({1516099695, 497758}, NULL) = 0

rpm --query centos-release
centos-release-6-3.el6.centos.9.x86_64

Process 4566 attached - interrupt to quit
     0.000000 select(10, [4 6 7 9], [], [], {1, 160003}) = 0 (Timeout)
     1.161298 open("/proc/diskstats", O_RDONLY) = 10
     0.000109 fstat(10, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
     0.000245 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6e1d035000
     0.000047 read(10, "   1       0 ram0 0 0 0 0 0 0 0 "..., 1024) = 1024
     0.000109 read(10, "0 sda 240731 163874 8048386 2853"..., 1024) = 611
     0.000061 read(10, "", 1024)        = 0
     0.000023 close(10)                 = 0
     0.000064 munmap(0x7f6e1d035000, 4096) = 0
     0.000036 open("/proc/stat", O_RDONLY) = 10
     0.000034 read(10, "cpu  3775592 27347 3516548 70619"..., 4095) = 866
     0.000056 close(10)                 = 0
     0.000028 open("/proc/vmstat", O_RDONLY) = 10
     0.000031 read(10, "nr_free_pages 75722nnr_inactive_"..., 4095) = 1964
     0.000042 close(10)                 = 0
     0.000037 select(10, [4 6 7 9], [], [], {4, 999068}) = 0 (Timeout)
     5.003442 open("/proc/diskstats", O_RDONLY) = 10
     0.000082 fstat(10, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
     0.000034 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6e1d035000
     0.000029 read(10, "   1       0 ram0 0 0 0 0 0 0 0 "..., 1024) = 1024
     0.000126 read(10, "0 sda 240731 163874 8048386 2853"..., 1024) = 611
     0.000045 read(10, "", 1024)        = 0
     0.000023 close(10)                 = 0
     0.000076 munmap(0x7f6e1d035000, 4096) = 0
     0.000036 open("/proc/stat", O_RDONLY) = 10
     0.000037 read(10, "cpu  3775592 27347 3516551 70619"..., 4095) = 866
     0.000084 close(10)                 = 0
     0.000045 open("/proc/vmstat", O_RDONLY) = 10
     0.000035 read(10, "nr_free_pages 75722nnr_inactive_"..., 4095) = 1964
     0.000100 close(10)                 = 0
     0.000055 select(10, [4 6 7 9], [], [], {2, 88417}