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perf 計測生データ
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| perf 計測生データ | |
| * perf record -p <pid> で profile を取る | |
| * bash と sshd を対象とする | |
| * sshd は TCPソケットでホストOSからのパケットを受け取ってシェルプロンプトに文字を書くのを請け負っている | |
| * ネットワーク割り込みが直接関係するのは、たぶん、sshd | |
| * エンターキー押しっぱなし、適当なキーを押しっぱなしにしてる状態の profile を取る |
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HPET on + bash + /proc/irq/19/smp_affinity が (f) デフォルト
- acpi_pm_read が消えた !!!
# ========
# captured on: Sun Mar 30 03:07:25 2014
# hostname : vagrant-centos65.vagrantup.com
# os release : 2.6.32-431.el6.x86_64
# perf version : 2.6.32-431.11.2.el6.x86_64.debug
# arch : x86_64
# nrcpus online : 4
# nrcpus avail : 4
# cpudesc : Intel(R) Core(TM) i7-4558U CPU @ 2.80GHz
# cpuid : GenuineIntel,6,69,1
# total memory : 603168 kB
# cmdline : /usr/bin/perf record -p 1578
# event : name = cpu-clock, type = 1, config = 0x0, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_kern = 0, excl_host = 0, excl_guest = 1, precise_ip = 0, id = { 32 }
# HEADER_CPU_TOPOLOGY info available, use -I to display
# HEADER_NUMA_TOPOLOGY info available, use -I to display
# pmu mappings: tracepoint = 2, software = 1
# ========
#
# Samples: 36 of event 'cpu-clock'
# Event count (approx.): 36
#
# Overhead Command Shared Object Symbol
# ........ ....... ................. ...................................
#
16.67% bash libc-2.12.so [.] __strlen_sse2
16.67% bash bash [.] 0x000000000004b57e
8.33% bash libc-2.12.so [.] __GI___strcmp_ssse3
5.56% bash libc-2.12.so [.] __gconv_transform_utf8_internal
5.56% bash libc-2.12.so [.] __mbrtowc
2.78% bash libc-2.12.so [.] malloc
2.78% bash libc-2.12.so [.] __wcslen
2.78% bash libc-2.12.so [.] _dl_mcount_wrapper_check
2.78% bash bash [.] yyparse
2.78% bash bash [.] dispose_fd_bitmap
2.78% bash bash [.] hash_search
2.78% bash bash [.] rl_prep_terminal
2.78% bash bash [.] _rl_start_using_history
2.78% bash bash [.] _rl_adjust_point
2.78% bash [kernel.kallsyms] [k] finish_task_switch
2.78% bash [kernel.kallsyms] [k] bit_waitqueue
2.78% bash [kernel.kallsyms] [k] kmem_cache_alloc_node_trace
2.78% bash [kernel.kallsyms] [k] kfree
2.78% bash [kernel.kallsyms] [k] vfs_ioctl
2.78% bash [kernel.kallsyms] [k] inotify_inode_queue_event
2.78% bash [kernel.kallsyms] [k] tty_flip_buffer_push
2.78% bash [kernel.kallsyms] [k] netlink_table_ungrab
#
# (For a higher level overview, try: perf report --sort comm,dso)
#
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HPET on + sshd + /proc/irq/19/smp_affinity が (f) デフォルト