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¡á Taskset À̶õ?
TaskSetÀº ÇÁ·Î¼¼½º°¡ »ç¿ëÇÒ CPU(CPU affinity) ¸¦ º¸¿©Áְųª ÁöÁ¤ÇØÁØ´Ù.
¡á »ç¿ë ¹æ¹ý
taskset [options] [mask | list ] [pid | command [arg]...]
mask´Â Process°¡ »ç¿ëÇÒ CPU °ªÀ» ³ªÅ¸³»¸ç 16Áø¼ö·Î Ç¥ÇöÀÌ µÈ´Ù.
0x00000001 ´Â 0¹ø ÇÁ·Î¼¼½º(CPU)ÀÇ »ç¿ëÀ» ³ªÅ¸³»¸ç
0x00000003 ´Â 0¹ø°ú 1¹ø ÇÁ·Î¼¼½º(CPU)ÀÇ »ç¿ëÀ» ³ªÅ¸³»¸ç
0xFFFFFFFF ´Â ¸ðµç ÇÁ·Î¼¼½º(CPU)ÀÇ »ç¿ëÀ» ³ªÅ¸³À´Ï´Ù.(0 ~ 31¹ø..)
¹°·Ð, mask¸¦ ÇÁ·Î¼¼¼(CPU)ÀÇ ¼ýÀڷΠǥÇöÇÒ ¼öµµ ÀÖ´Ù. mask¸¦ ÇÁ·Î¼¼¼(CPU)ÀÇ ¼ýÀÚ·Î ³ªÅ¸³»±â À§Çؼ´Â ÁÖ¿ä ¿É¼ÇÀÇ "-c, --cpu-list " ¿É¼ÇÀ» »ç¿ëÇØÁÖ¸é µÈ´Ù.
¡á ÁÖ¿ä ¿É¼Ç
-p, --pid
operate on an existing PID and not launch a new task
-c, --cpu-list
specifiy a numerical list of processors instead of a bitmask.
The list may contain multiple items, separated by comma, and
ranges. For example, 0,5,7,9-11
* À§ÀÇ ¿É¼ÇµéÀº º¸¿©ÁÖ°£, ¼¼ÆÃÇÒ¶§ µ¿ÀÏÇÏ°Ô »ç¿ëµÇ¾î Áø´Ù.
¡á ¸í·É¾îÀÇ ´Ù¾ç ÇÑ ¿¹
1) ÇØ´ç ÇÁ·Î¼¼½ºÀÇ ÁöÁ¤µÈ CPU º¸±â (CPU affinity)
# taskset -p pid
====================
# taskset -p 4444
pid 4444's current affinity mask: 9 <-- -c ¿É¼ÇÀÌ ¾øÀ¸¸é mask´Â 16Áø¼ö·Î ³ª¿Â´Ù.
# taskset -pc 4444
pid 4444's current affinity list: 0,3 <-- -c ¿É¼ÇÀ» ³ÖÀ¸´Ï cpu number ·Î Ç¥Çö.
=====================
2) ÇØ´ç ÇÁ·Î¼¼½ºÀÇ ÁöÁ¤µÈ CPU º¯°æ Çϱâ
# taskset -pc "processor number" pid
====================
# taskset -pc 0-7 4444 <-- 0,3 // 0-7(0,1,2,3,4,5,6,7) ÇüÅ·ΠÁöÁ¤ ÇÒ¼ö ÀÖ´Ù.
pid 4444's current affinity list: 0,3
pid 4444's new affinity list: 0-7
(16 Áø¼ö´Â º¸±â Èûµå´Ï ¿¹Á¦¿¡¼ Á¦¿Ü)
====================
3) command »ç¿ëÇÏ¿© ±¸µ¿½Ã º¯°æÇϱâ
# taskset -c "process nuber" "command"
=====================
# taskset -c 0,1,2,3,4 /etc/init.d/httpd start
½ÇÁö·Î´Â -pc ¿É¼ÇÀ» ½áµµ Á¤»óÀûÀ¸·Î ±¸µ¿µÈ´Ù.)
=====================
¡á °í·Á »çÇ×
1) ÀÚ½Ä Process ¿¡ ÇØ´ç ¼³Á¤ ½Â°è ¿©ºÎ
* ºÎ¸ðÀÇ Á¤º¸¸¦ ±×´ë·Î µû¶ó °©´Ï´Ù.
´Ü, ÇØ´ç CPUÀÇ ÁöÁ¤Àü¿¡ ±¸µ¿µÈ ÀÚ½Ä ÇÁ·Î¼¼½ºÀÇ ¼³Á¤Àº º¯°æµÇÁö ¾Ê½À´Ï´Ù.
Ȥ, º¯°æÀü¿¡ ±¸µ¿µÈ ÀÚ½Ä ÇÁ·Î¼¼½º°¡ ÀÖ´Ù¸é °°ÀÌ(ÀÏÀÏÀÌ) º¯°æÇØ Áà¾ß ÇÕ´Ï´Ù.
** taskset -c "process nuber" "command" ÇüÅ·Π±¸µ¿ÇÏ¿´À»¶§¿¡´Â »ó°ü ¾ø½À´Ï´Ù. ¿©±â¼ ¹®Á¦½Ã µÇ´Â °ÍÀº ±¸µ¿ ÈÄ¿¡ CPU ÁöÁ¤À» º¯°æÇÏ¿´À» ¶§ ÀÔ´Ï´Ù.
À¯¿ëÇÑ Á¤º¸ µÇ½Ã±â¸¦ ¹Ù¶ø´Ï´Ù.
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