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= 성능 점검/분석 =
== 명령어 ==
* uptime : 시스템 부하 표시
* vmstat 
* ps / top
* netstat
== 프로세스 통계(Process Accounting) ==
* http://wiki.kldp.org/wiki.php/LinuxdocSgml/Process-Accounting
=== 데비안 패키지 ===
* acct - The GNU Accounting utilities for process and login accounting
* exmap - determine how much physical memory and swap is used by individual processes

= 디스크 I/O =
* /etc/fstab 를 조금 수정해 준다.noatime을 추가해 주면 접근시간을 기록하지 않아서 조금 빨라진다. 
 /dev/hda1    /    ext3    errors=remount-ro,noatime    0 1
== hdparm ==
* [http://debianusers.org/DebianWiki/wiki.php/hdparm 데비안 사용자 모임 위키: hdparm]
* hdparm -i /dev/hdc 결과 (open 서버)
 /dev/hdc:
 <br/>
 Model=HDS722525VLAT80, FwRev=V36OA6MA, SerialNo=VN69TECFEEY1EA
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=52
 BuffType=DualPortCache, BuffSize=7938kB, MaxMultSect=16, MultSect=off
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=268435455
 IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4 
 DMA modes:  mdma0 mdma1 mdma2 
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 udma3 udma4 *udma5 
 AdvancedPM=yes: disabled (255) WriteCache=enabled
 Drive conforms to: ATA/ATAPI-6 T13 1410D revision 3a:  ATA/ATAPI-2 ATA/ATAPI-3 ATA/ATAPI-4 ATA/ATAPI-5 ATA/ATAPI-6
 <br/>
 * signifies the current active mode
* 위의 결과(MaxMultSect=16)를 보고 multicount 를 16(on)으로 셋팅해줌 (07/10/9)
 # hdparm -m16 /dev/hdc
= 서비스 =
* [http://linuxgazette.net/123/vishnu.html Configuring Apache for Maximum Performance]
* [http://phplens.com/lens/php-book/optimizing-debugging-php.php A HOWTO on Optimizing PHP]
== MySQL ==
* [http://linuxchannel.net/docs/mysql-timeout.txt mysql의 timeout값 설정하기]
* [http://drupal.org/node/51263 Tuning MySQL for Drupal]
* [http://www.kitebird.com/mysql-book/ Web site for MySQL, Fourth Edition]
* [http://dev.mysql.com/tech-resources/articles/mysql-query-cache.html A Practical Look at the MySQL Query Cache]

= 참고 =
* http://linuxchannel.net/
* http://database.sarang.net
* http://tunelinux.pe.kr
* http://kldp.org
* http://debianusers.org

[[category: 기술]]
[[category: 서버]]