Ping'i degistirip milisaniye yerine microsaniye hassasiyetinde
degerler dondurmesini sagladim (tezim icin gerekli). Asagida ornek
cikti var:
-----------------------------------------------------------------
64 bytes from 193.140.250.50: icmp_seq=4976 ttl=60 time=17619 us
64 bytes from 193.140.250.50: icmp_seq=4977 ttl=60 time=37598 us
64 bytes from 193.140.250.50: icmp_seq=4978 ttl=60 time=37901 us
64 bytes from 193.140.250.50: icmp_seq=4979 ttl=60 time=67165 us
64 bytes from 193.140.250.50: icmp_seq=4980 ttl=60 time=54299 us
64 bytes from 193.140.250.50: icmp_seq=4981 ttl=60 time=96715 us
64 bytes from 193.140.250.50: icmp_seq=4982 ttl=60 time=17397 us
64 bytes from 193.140.250.50: icmp_seq=4983 ttl=60 time=17470 us
64 bytes from 193.140.250.50: icmp_seq=4984 ttl=60 time=17197 us
------------------------------------------------------------------
Simdi olay micro saniye mertebesinde olunca eminim bu degerler
sistemdeki CPU yukune bagli olarak degisiyordur. Ama bana
4 microsaniye hassasiyet gerekli.
$unu yapsam diyorum: Linux'taki gereksiz processleri oldurup
sadece benim ping programini calistirsam? Ondan sonra
bir kalibrasyon yapsam. Peki kesin calismak zorunda olan process'ler
var mi? Gocmesin sonra makine?
Benim makinada calisan process listesi (ps aux) soyle (tipik zaten):
----------------------------------------------------------------------------------
USER PID %CPU %MEM SIZE RSS TTY STAT START TIME COMMAND
bin 83 0.0 0.2 848 304 ? S Jan 12 0:00 /usr/sbin/rpc.portmap
nobody 112 0.0 0.5 1108 648 ? S Jan 12 0:00 /usr/sbin/httpd
nobody 113 0.0 0.5 1108 640 ? S Jan 12 0:00 /usr/sbin/httpd
nobody 114 0.0 0.4 1084 556 ? S Jan 12 0:00 /usr/sbin/httpd
nobody 115 0.0 0.4 1084 552 ? S Jan 12 0:00 /usr/sbin/httpd
nobody 116 0.0 0.5 1108 648 ? S Jan 12 0:00 /usr/sbin/httpd
nobody 7988 0.0 0.4 1084 576 ? S Jan 17 0:00 /usr/sbin/httpd
nobody 12844 0.0 0.4 1084 560 ? S Jan 22 0:00 /usr/sbin/httpd
root 1 0.0 0.2 848 340 ? S Jan 12 0:26 init [3]
root 2 0.0 0.0 0 0 ? SW Jan 12 0:00 (kflushd)
root 3 0.0 0.0 0 0 ? SW<Jan 12 0:00 (kswapd)
root 4 0.0 0.0 0 0 ? SW Jan 12 0:00 (nfsiod)
root 5 0.0 0.0 0 0 ? SW Jan 12 0:00 (nfsiod)
root 6 0.0 0.0 0 0 ? SW Jan 12 0:00 (nfsiod)
root 7 0.0 0.0 0 0 ? SW Jan 12 0:00 (nfsiod)
root 13 0.0 0.1 824 252 ? S Jan 12 0:01 /sbin/update
root 14 0.0 0.2 836 300 ? S Jan 12 0:00 /sbin/kerneld
root 80 0.0 0.3 856 388 ? S Jan 12 0:13 /usr/sbin/syslogd
root 81 0.0 0.4 1104 556 ? S Jan 12 0:01 /usr/sbin/klogd
root 85 0.0 0.2 848 368 ? S Jan 12 0:00 /usr/sbin/inetd
root 87 0.0 0.2 864 316 ? S Jan 12 0:00 /usr/sbin/lpd
root 90 0.0 0.3 880 396 ? S Jan 12 0:00 /usr/sbin/rpc.mountd
root 92 0.0 0.3 916 404 ? S Jan 12 0:00 /usr/sbin/rpc.nfsd
root 94 0.0 0.2 844 324 ? S Jan 12 0:00 /usr/sbin/crond -l10
root 100 0.0 0.5 1268 724 ? S Jan 12 0:00 sendmail:
root 107 0.0 0.2 840 296 3 S Jan 12 0:00 /sbin/agetty 38400 tty3
root 108 0.0 0.2 840 296 4 S Jan 12 0:00 /sbin/agetty 38400 tty4
root 109 0.0 0.2 840 296 5 S Jan 12 0:00 /sbin/agetty 38400 tty5
root 110 0.0 0.2 840 284 6 S Jan 12 0:00 /sbin/agetty 38400 tty6
root 111 0.0 0.4 1084 552 ? S Jan 12 0:00 /usr/sbin/httpd
root 2096 0.0 0.4 1172 616 1 S Jan 13 0:00 -bash
------------------------------------------------------------------------------------
Bunlarin bircogu oldurulebilir. Fakat bazilarindan supheliyim
mesela: init [3], (kflushd), (kswapd), /sbin/update, /sbin/kerneld,
/usr/sbin/syslogd, /usr/sbin/crond -l10 ... gibi.
Aslinda bunlarin tam ne oldugunu bilmedigim supheliyim. Linux'ta olmazsa
olmaz process'ler var midir? Varsa nelerdir?
Umarim acik olmustur. Yardimci olursaniz sevinirim.
Saygi&Sevgi.
Pars Mutaf
Izmir Yuksek Teknoloji Enstitusu
Listeden cikmak icin:
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